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Application of Pickering emulsion in oil drilling and production

  • Lipei Fu , Qianli Ma , Kaili Liao EMAIL logo , Junnan An , Jinmei Bai and Yanfeng He EMAIL logo
Published/Copyright: December 3, 2021
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Nanotechnology Reviews
From the journal Nanotechnology Reviews Volume 11 Issue 1

Abstract

When surfactant is used as emulsifier, the stability of emulsion is often greatly reduced with the influence of reservoir conditions (temperature, pressure, salinity, etc.), which shortens the validity period of emulsion. Pickering emulsion has a wide range of applications in the oil and gas field due to its advantages of good stability and easy regulation. In this article, the formation, stabilization mechanism, and influencing factors of Pickering emulsions were introduced, and the application status and prospects of Pickering emulsions in oil and gas field were summarized. It was pointed out that Pickering emulsion has many advantages and important research value when applied in deep strata and complicated reservoirs. It is expected that this article can effectively reflect the application value of Pickering emulsion in oil and gas field and promote the application of Pickering emulsion in petroleum industry.

Keywords: Pickering emulsion; influencing factors; petroleum industry application; emulsifier

1 Introduction

Emulsion is a dispersion system in which one liquid is dispersed in the form of liquid beads in another immiscible liquid. Pickering emulsion is a special one, which uses ultrafine solid particles as an emulsifier [1]. Pickering first found in 1907 that solid particles could be adsorbed on the surface of oil droplets to form a stable emulsion [1]. Later, people called this emulsion system as Pickering emulsion, and the solid particles which can emulsify and stabilize were called Pickering particles. The biggest difference between Pickering emulsion and common emulsion is that emulsifier is solid particles. In addition, compared with common emulsion, Pickering emulsion has the advantages of better stability, less emulsifier, recyclability, and environmental friendliness [2–5]. Therefore, Pickering emulsion has been widely studied and applied in the fields of food, fine chemical synthesis, medicine, cosmetics, and so on [6–10]. Pickering emulsion has also attracted more and more attention in petroleum industry, such as drilling, enhanced oil recovery (EOR), sand control, and petroleum wastewater treatment [11–16]. In this article, the formation, stability mechanism, influencing factors, and application progress of Pickering emulsion in oil and gas field will be introduced.

2 Pickering emulsion and its stability

2.1 Formation of Pickering emulsion

Pickering emulsion is prepared by homogenizing or ultrasonic emulsification of aqueous phase (some containing electrolytes), oil phase (strong polarity, medium polarity, weak polarity, or non-polarity), and solid emulsifiers. The droplet size of Pickering emulsion is generally in micron order, and the smaller the size, the better the emulsification ability [17–19]. Solid particles can be divided into flakes and granular. Flake solid particles mainly include kaolin, clay, synthetic lithium saponite, montmorillonite, graphene oxide (GO), and so on [20–22,46]. Granular solid particles include silicon dioxide, zinc oxide, iron oxide, titanium silicate, metal sulfate, polystyrene, Janus microspheres, starch nanocrystals, and so on [23–30].

Pickering emulsion can be classified into oil-in-water (O/W) and water-in-oil (W/O) types as well as surfactant stabilized emulsion. Schematic diagram of classical (surfactant based) emulsion and Pickering emulsion are shown in Figure 1.

Figure 1 Schematic diagram of classical (surfactant based) emulsion and Pickering emulsion [31].
Figure 1

Schematic diagram of classical (surfactant based) emulsion and Pickering emulsion [31].

Surfactants generally have hydrophilic groups and hydrophobic groups, belonging to amphiphilic molecules. They are directionally arranged at the oil–water interface to form common emulsion, and the main performance evaluation parameter is hydrophilic-lipophilic balance value. Pickering emulsion is mainly formed by the adsorption of solid particles with certain wettability to the oil–water interface, which would form a single-layer or multi-layer film of solid particles. The three-phase contact angle is the main parameter for evaluating the performance of solid particles. When the three-phase contact angle θ is less than 90°, the solid particles are hydrophilic. The wettability of solid particles is lipophilic when the three-phase contact angle θ is more than 90° [32]. Relationship between wettability of particles and emulsion type is shown in Figure 2.

Figure 2 Relationship between wettability of particles and emulsion type [36].
Figure 2

Relationship between wettability of particles and emulsion type [36].

2.2 Stability mechanisms and influencing factors of Pickering emulsion

2.2.1 Stability mechanisms

The stability mechanisms of Pickering emulsion mainly include the following viewpoints: mechanical barrier mechanism and three-dimensional viscoelastic particle network mechanism [32]. Among them, the mechanism of barrier mechanism has been widely recognized [33–35].

(1) Mechanical barrier mechanism [36]: The compact arrangement of solid emulsifiers on the surface of the emulsion hinders the collision and agglomeration between droplets in space. At the same time, the particle emulsifier adsorbed on the surface of the droplet increases the repulsive force between the droplets. These two effects improve the stability of emulsion, as shown in Figure 3(a).

Figure 3 Stability mechanism of Pickering emulsion [38]. (a) Mechanical barrier mechanism and (b) three-dimensional viscoelastic particle network mechanism.
Figure 3

Stability mechanism of Pickering emulsion [38]. (a) Mechanical barrier mechanism and (b) three-dimensional viscoelastic particle network mechanism.

(2) Three-dimensional viscoelastic particle network mechanism [37]: This theory was proposed by Lagaly et al. in 1999. As shown in Figure 3(b), the interaction between particles and particles and between particles forms a stable three-dimensional network structure, which increases the viscosity of the continuous phase, prevents the aggregation of the droplets, and inhibits the delamination of the emulsion. The ability of resisting deformation has also been enhanced.

The evaluation methods of emulsion stability mainly include microscope analysis, particle size analysis, zeta potential analysis, high-speed centrifugation method, conductivity method, turbidity method, and rheological analysis. The microscopic analysis has its own shortcomings, for example improper operation in the process of sample preparation will destroy the structure of the sample to a certain extent. The optical particle size analyzer is only suitable for emulsion with relatively smaller volume fraction. Zeta potential analysis, high-speed centrifugation method, and conductivity and turbidity method have requirements on the volume fraction and viscosity of emulsion, but they cannot accurately analyze emulsion with higher volume fraction and viscosity. For rheological analysis, the influence of other variables on emulsion stability should be ignored [39].

2.2.2 Influencing factors

2.2.2.1 Wettability of solid particles

The wettability of solid particles plays a decisive role in the type of emulsion, because it greatly affects the performance of the emulsion, and it is one of the most important factors affecting the properties of the emulsion. Binks et al. [36] found that most of the surfaces of hydrophilic particles were adsorbed in polar water rather than in non-polar phase, and most of the surfaces of hydrophobic particles were adsorbed in non-polar air or oil. When the particles are hydrophobic, W/O Pickering emulsion was formed, and when the particles are hydrophilic, O/W Pickering emulsion was formed. Emir et al. [40] studied the influence of ordinary glass beads (contact angle 48 ± 4°) and modified glass beads (contact angle 93 ± 3°) on Pickering emulsion, and they found that the droplets’ size and distribution width of emulsion stabilized by modified glass beads were smaller than those stabilized by ordinary glass beads.

2.2.2.2 Solid particle concentration

The concentration of solid particles influences the droplet size and stability of Pickering emulsion. Under certain emulsification conditions, when the concentration of solid particles increases, the size of the emulsion droplets decreases, and the stability of the concentrated emulsion improves. However, when the concentration of solid particles reaches the critical micelle concentration, the size of the emulsion droplets will remain unchanged. Aveyard et al. [41] took monodisperse spherical silica particles with a diameter of 25 nm as the research object and found that the viscosity of the emulsion increased with the increase in the particle concentration, the concentration of solid particles increased by ten times, and the droplet size of the emulsion decreased by about eight times. However, when the particle concentration reached 3%, the solid particle concentration reached the critical micelle concentration, the polarity of the particle concentration increased, and the droplet size of the emulsion was basically unchanged. When studying the influence of silica concentration on the stability of emulsions, Justyna et al. [42] also reached a similar conclusion. As the silica concentration increased, the droplet size of the emulsion decreased gradually until it reached the critical micelle concentration, and the droplet size remained stable. By observing the stability of the emulsion, it was found that no demulsification occurred in 2 years. He et al. [46] used only GO as stabilizer to prepare Pickering emulsion, and the effect of GO concentration on emulsion stability was investigated. It was found that with the increase in GO concentration, the average droplet size of emulsion decreased gradually and the stability improved.

2.2.2.3 Oil–water ratio

The oil–water ratio is an important factor affecting the stability of the Pickering emulsion. The change in oil–water ratio may lead to the reverse of emulsion. White et al. [43] prepared the emulsion with a mixture of modified silica particle, water, and 2,6-lutidine. They found that slight changes in hydration on the surface of the particle could lead to the change in emulsion structure. Reducing particle hydration would transform the emulsion from lutidine-in-water (L/W) to water-in-lutidine (W/L). Stilier et al. [44] studied the influence of different surface-modified titanium dioxides on the type and stability of the emulsion. They found that the type of emulsion will change from water/oil to oil/water with the increase in water volume. With the increase in the particle hydrophobicity, the long-term stability of O/W emulsion decreased, while that of W/O emulsion increased.

2.2.2.4 Aqueous phase pH value

The change in pH value of aqueous phase will affect the wettability or electrical properties of the particles, thereby affecting the adsorption behavior of the particles at the oil–water interface, and finally affecting the properties of the Pickering emulsion. Yang et al. [45] used positively charged lamellar double hydroxide (LDH) particles as emulsifier and liquid paraffin as oil phase to prepare emulsion. Their research pointed out that with the increase in pH value, the zeta potential of LDH particles decreased, the contact angle increased (only changed little), and the structural strength of LDHs dispersion increased, and the stability of emulsion improved. By adjusting the pH value of LDHs dispersion, the adsorption capacity of particles on oil–water surface could be regulated. This study proved that by changing the pH value of the LDHs dispersion, the adsorption of LDHs particles at the oil–water interface could be controlled, which in turn affected the stability of the Pickering emulsion. Tang et al. [3] studied the influence of pH change on the stability of the Pickering emulsion by using the self-assembly structure of the Pickering emulsion. They pointed out that the change in pH value would affect the aggregation and dispersion behavior of Janus particles. When pH <7, the surface of Janus particles was acidic and easily protonated, which made the particles more easily wetted by oil phase, thus achieving the stability of W/O Pickering emulsion; When pH >7, acrylic acid would deprotonate to stabilize the Pickering emulsion. Tang et al. believed that this phenomenon was caused by the strong electrostatic charge repulsion between the Janus particles under alkaline conditions. He et al. [46] studied the factors affecting the stability of GO Pickering emulsion. They found that with the increase in pH value (Figure 4), the hydrophilicity of GO increased, the Zeta potential decreased, the surface charge density increased, and electrostatic repulsion between GOs increased. This would destroy the accumulation of GO at the oil–water interface, affect the formation and strength of the interface film, and be detrimental to the stability of the emulsion.

Figure 4 Pickering emulsions stabilized by GO at different pH values: (a) pH = 1, (b) pH = 3, (c) pH = 6, (d) pH = 9, and (e) pH = 11 [46].
Figure 4

Pickering emulsions stabilized by GO at different pH values: (a) pH = 1, (b) pH = 3, (c) pH = 6, (d) pH = 9, and (e) pH = 11 [46].

2.2.2.5 Salinity

The salinity of the aqueous phase may directly change the potential of the particle surface, and may also cause flocculation and sedimentation of the particles, which may affect the stability of the Pickering emulsion to a certain extent. Sharma et al. [47] found that adding appropriate concentration of NaCl to the flocculated micron-sized silica (SiO2) could achieve long-term stability and make the nanoparticles (NPs) aggregate, thus enhancing the coagulation stability of the emulsion droplets. Yu et al. [48] pointed out that when the salinity of the oil-in-water Pickering emulsion stabilized by Na-montmorillonite was too low or too high, it was not conducive to maintain the viscosity of the Pickering emulsion. The mechanism is shown in Figure 5.

Figure 5 Pickering emulsion stabilized by clay at very low (a) and very high (b) salinities [48].
Figure 5

Pickering emulsion stabilized by clay at very low (a) and very high (b) salinities [48].

2.2.2.6 Oil phase

The selection of oil phase also has a great influence on the Pickering emulsion, and the main influencing parameters are viscosity and polarity of the oil phase. Binks and Lumsdon [49] used more than a dozen different polar oil phases and hydrophobic particles to prepare emulsions. They found that for some polar oils (such as esters and alcohols), W/O emulsions were formed. But for non-polar oils such as hydrocarbons, even though the particles are more hydrophobic, O/W emulsions are still formed. The reason is mainly related to the influence of adsorption between oil phase and water phase on the contact angle. The selection of oil phase also has a great influence on the Pickering emulsion, mainly the viscosity and polarity of the oil phase affects the Pickering emulsion. Tsabet and Fradette [40] found that when the oil phase viscosity was lower than 485.5 mPa s, the droplet diameter of emulsion remains unchanged with the change in viscosity, and when the oil phase viscosity is higher than this value, the droplet diameter increases obviously. Chesters [50] gave the following explanation for this. When the viscosity of oil phase is very high, the high viscosity of oil reduces the fluidity of the droplet interface, prevents the formation of liquid film and the adsorption of particles on it, and slows down the adsorption speed, resulting in poor emulsion stability and large droplets.

There are many factors that affect the Pickering emulsion, such as particle type, particle shape and size, dispersion mode, dispersion time, temperature, pressure, etc. [46,51–53]. When preparing or using the Pickering emulsion, a more detailed experiment should be carried out to find the best formula.

3 Application of Pickering emulsion in oil and gas field

3.1 Drilling

The main function of drilling fluid are to clean the bottom hole, absorb cuttings, cool and lubricate the drill bit and drill string, form mud cake, and seal the well wall. [54–57]. Drilling fluid is a typical colloidal dispersion system, which can be divided into water-based drilling fluid, oil-based drilling fluid, and gas drilling fluid according to the dispersion medium. Water-based drilling fluid is suitable for reservoirs with low temperature and low pressure, while oil-based drilling fluid is suitable for reservoirs with high temperature and high pressure [58–64]. Oil-based drilling fluid is a complicated W/O Pickering emulsion system, which is stabilized by surfactant and NPs. Adding solid particles to the drilling fluid can improve the rheological properties of the fluid, reduce filtration loss and friction coefficient, and improve heat transfer rate. With the deep development of exploration and development of oil and gas resources, reservoirs are becoming more and more complex, and the requirements of oil-based drilling fluid are getting higher and higher. In the application of oil-based drilling fluid, the stability of the drilling fluid emulsion is of great importance. The excellent stability of Pickering emulsion just provides a solution to improve the stability of oil-based drilling fluid.

Liu et al. [65] developed a Pickering emulsion stabilized by high-temperature-resistant organoclay and moderately hydrophobic nano-SiO2 to solve the problems of poor thermal stability and unsatisfactory application of the Pickering emulsion in high temperature formation environment. They pointed out that the Pickering emulsion was easy to prepare and friendly to the environment, and kept good rheological properties after hot rolling tests at 220°C, which showed great application potential in high-temperature-resistant drilling fluids. The research by Ai et al. [66] also got similar results. NP-stabilized W/O emulsion could increase the viscosity and shear resistance of the drilling fluid, and greatly improve the stability of the drilling fluid. The drilling fluid developed by Ai et al. could be used in shale reservoirs. There are also many patents related to the preparation of drilling fluid by the Pickering emulsion [67–69]. Dargahi-Zaboli et al. [70] formed a stable W/O invert emulsion with hydrophobic nano-SiO2 NPs for drilling, and pointed out that the properties and content of NPs could be adjusted to improve the performance of drilling fluid, so that the emulsion still had good thermal stability at 120°C. Sharma and Sangwai [71] prepared Pickering emulsion with SiO2, clay, sodium dodecyl sulfate (SDS), polyacrylamide, and sodium chloride. They pointed out that the emulsion had good viscoelasticity under high pressure and high temperature conditions, and was suitable for drilling fluid at high temperature and high pressure. Aiming at the damage of oil-based drilling fluid in oil well completion, Huo et al. [72] prepared bentonite solid particles with different surface wettability through the in situ activation technology by changing the concentration of the surfactant cetyltrimethylammonium bromide (CTAB), and studied the phase transition mechanism of CTAB inducing bentonite emulsion rotation. The experimental results showed that the wettability of bentonite particles can be changed by changing CTAB concentration, and then the bentonite emulsion can be induced to undergo two-phase inversion behaviors. The research on application performance indicated that the reversible emulsion oil-based drilling fluid system has good thermal stability with small filtration, so as to avoid the damage of traditional oil-based drilling fluid in oil well completion. Halliburton Energy Services has developed a Pickering foam drilling fluid, which can be pumped through a drill string, and extend the wellbore through the subterranean formation [73]. Cui et al. prepared Pickering emulsion with nano-Al2O3 and diesel oil. This emulsion had strong stability and could be stored for more than 1 year at room temperature. The emulsion could be demulsified by adding a small amount of cationic surfactant, which had potential applications in diesel oil transportation and drilling fluid preparation [74].

Pickering emulsion can also be used to cool the drill bit. As the specific surface area of drilling fluid molecules increases, the heat exchange rate increases. The NPs have a very high specific surface area just to improve the ability of the drill bit to transfer heat. Farshad et al. [75] used nano titanium dioxide and carbon nanotubes to change the thermal properties of the drilling fluids. They pointed out that the ratio of convection heat transfer and conduction heat transfer of the drilling fluid containing carbon nanotubes was about 30% higher than that of the drilling fluid containing titanium dioxide NPs. The convective heat transfer coefficient increased from 2,950 W/m2 ⋅°C to 3,360 W/m2 ⋅°C by decreasing the average size of the carbon nanotubes from 76 to 54 nm. Their research showed that Pickering emulsion could improve the thermal efficiency of the liquid as the transport fluid.

3.2 Enhanced oil recovery

3.2.1 Oil displacing agent

Traditional emulsion flooding is to inject the emulsion formed by emulsifier (surfactant or polymer with surface activity) and crude oil under high-speed stirring into the formation to displace the residual oil after water flooding. Indoor and on-site practice have shown that emulsion flooding can effectively reduce the amount of residual oil in the formation [76–78]. However, the traditional emulsion cannot be widely used in oil displacement because of its poor long-distance migration performance and not good enough thermal stability. Pickering emulsion formed by NPs as emulsifier can overcome the above difficulties and be used as oil displacement agent. Because nano-SiO2 and nano-clay are relatively easy to prepare and cheap, there were many reports about the use of nano-SiO2 and nano-clay as emulsifiers when studying the use of Picketing emulsion in oil fields.

Pickering emulsion with solid particles as emulsifier provides more options for emulsion to enhance oil recovery. The NP-stabilized solvent-based emulsion studied by Kumar et al. [79] can easily pass through the pore throat size of the reservoir, which is helpful to improve the recovery of heavy oil. Jia et al. [80] studied multiple O/W/O Pickering emulsions stabilized by amphiphilic Janus-SiO2 NPs (Janus-C12), which showed excellent EOR performance in core displacement experiments, which can improve oil recovery by 27.2%. Mo et al. [81] modified kaolinite with dimethyl sulfoxide (DMSO) and 3-aminopropyltrimethoxysilane (APTMS) and used it as emulsifier to prepare Pickering emulsion, which can maintain stability for at least 60 days and has great potential application in oil recovery in the field. Wang et al. [82] pointed out that Pickering emulsion stabilized by cellulose nanocrystals (CNCs) has good stability at 100°C. They believed that this emulsion could reduce costs and facilitate field applications of emulsion flooding in heavy oil recovery. Li et al. [83] studied Pickering emulsion with clay particles (sodium montmorillonite) as emulsifier, which can be used for development of high salinity reservoirs. The experimental results show that after Pickering emulsion flooding, the recovery ratio increased from 67% (water flooding) to more than 80%. Radnia et al. [84] prepared a stable Pickering emulsion with GO, and studied the effects of GO concentration, salinity of aqueous phase, asphaltene concentration of organic phase on emulsion stability, and the interfacial tension between the organic phase and the aqueous phase, and explored its potential application in enhancing oil recovery. The results showed that the concentration of GO and asphaltene were inversely proportional to the interfacial tension. And compared with the O/W emulsion, the O/W emulsion was more suitable for enhanced oil recovery (EOR). W/O emulsion was stabilized when the asphaltene concentration was 1.5% or higher. And an increase in the water/oil ratio caused the inversion in the emulsion type yielding an O/W emulsion. When the salinity was greater than 1 wt%, some droplets would change into W/O/W type multiple emulsion. When the concentration of GO was 1 mg/mL and the concentration of asphaltene was 0.05 wt%, the droplet size of the emulsion was the smallest. Chen et al. [85] modified the prepared high crystalline α-zirconium phosphate (α-ZrP) nanometers with octadecyltrichlorosilane (OTS) to obtain hydrophobic nanosheets, and prepared Pickering emulsion using this material as an emulsifier. The droplet diameter of the Pickering emulsion was inversely proportional to the concentration of NPs. When the concentration was greater than 100 mg/L, the change in nanosheets’ concentration had almost no effect on the droplet diameter; after the core wettability changed, the viscosity of the Pickering emulsion increased, which reduced the fluidity ratio and improved the sweep efficiency, so as to improve the recovery.

Many scholars have studied the stability of the Pickering emulsion by using solid particles and surfactants. The research shows that the emulsion formed by solid particles and surfactant shows excellent stability, which is not available by using solid particles or surfactant alone [86,87]. When solid particles and surfactant are used as emulsifiers at the same time, the surfactant can change the surface properties of the NPs through electrostatic adsorption or repulsion, resulting in synergy, thus improving the stability of the emulsion. In recent years, Pickering emulsion, which is co-stabilized by particles and surfactants, has been actively studied in the field of EOR. Akshit et al. [88] compared the emulsion stabilized by hydrophilic silica NPs with emulsion that was stabilized by surfactant at 80°C. They found that the nanofluid containing only NPs is easier to form emulsion than the surfactant aqueous solution and nanoparticle/surfactant nanofluid, and the required concentration of NPs is lower than that of the surfactant. Kim et al. [89] studied emulsions stabilized by different types of surfactants and nano-SiO2 particles. They found that the emulsion stabilized by cationic surfactant and nano-SiO2 has the best stability, and have a good mobility control effect on water flooding reservoirs. Pei et al. [90,91] applied the emulsion stabilized by nano-SiO2 and cetyl trimethyl ammonium bromide to develop heavy oil with viscosity of 325 mPa s (50°C), which can improve oil recovery by more than 30%. Their research showed that the emulsion has a good potential to improve the recovery of heavy oil by water flooding.

Some researchers have also studied the application potential of Pickering emulsion stabilized by particles, surfactants, and/or polymers in improving oil recovery. Sharma et al. [11] prepared stable emulsion with nano-SiO2, SDS, polyacrylamide, and lubricating oil. Using this emulsion, Berea core flooding was carried out for heavy oil with viscosity of 161 mPa s, and the results showed that the recovery efficiency was increased by more than 23%. Khalil et al. [92] functionalized superparamagnetic nanoparticles (SPN) with oleic acid and polyacrylamide (PAM), and compared the effects of the particles before and after surface functionalization on improving the secondary or tertiary recovery capacity of the sand layer. The results showed that the concentration of NPs and the types and structure of surface modifiers had significant effects on the viscosity and mobility of the Pickering emulsion. The hydrophilicity of NPs depends on the type and structure of surface modification. If the suspended SPN-PAM can be used as a fluidity control and wettability modifier, it can promote the formation and separation pressure of Pickering emulsion, and thus increase the oil recovery. Kumar et al. [13] prepared stable O/W surfactant-polymer nanoparticles (surfactant–polymer–nanoparticles (SPN)) Pickering emulsion by using light mineral oil, carboxy methyl cellulose (CMC) and SiO2 NPs, and anionic surfactant. The emulsion had good thermal stability and its viscosity was relatively stable in the range of 30–100°C. After conventional water flooding, additional recovery of more than 24% was observed by Pickering emulsion.

Some studies have applied stimuliresponsive Pickering emulsion to oil production. Liang et al. [93] used Fe3O4 NP and poly[2-(dimethylamino)ethyl methacrylate] as raw materials, and synthesized Pickering emulsion which was responsive to pH and magnetism by ultrasonic-assisted in situ precipitation. Pickering emulsion could be rapidly emulsified/demulsified for more than six cycles, which had great application prospects in intelligent oil recovery. A summary on Pickering emulsion for enhanced oil recovery is given in Table 1.

Table 1

Pickering emulsion as oil displacement agent for EOR

Materials Particles References
Particles SiO2 [78]
Amphiphilic Janus-SiO2 NPs [79]
Modified kaolinite with dimethyl sulfoxide (DMSO) and 3-aminopropyltrimethoxysilane (APTMS) [80]
Cellulose nanocrystals (CNCs) [81]
Sodium montmorillonite [82]
Graphene oxide [83]
High crystalline α-ZrP nanometers with OTS [84]
Particles + surfactant SiO2 and anionic surfactant [87]
SiO2, AlOOH, and TX-100 [86]
SiO2 and cethyltrimethylammonium bromide [90,91]
Particles + polymer Fe3O4 NP and poly[2-(dimethylamino)ethyl methacrylate] [93]
Functionalized SPN with OA and PAM [92]
Particles + surfactant + polymer Light mineral oil, CMC, SiO2 NPs, and anionic surfactant [13]
SiO2, clay, SDS, and PAM [94]

To sum up, Pickering emulsion is an effective method for developing high temperature, high salinity, and heavy oil reservoirs.

3.2.2 Profile modification agent

The problem of production of associated water from the oil wells is common in the oilfield development. It is necessary to implement water plugging in production wells and adjust the water injection profile of water injection wells. It is more difficult to profile control and water shutoff after the oilfield enters the period of high water cut or ultra-high water cut stage. Pickering emulsion based on nanomaterials shows good application prospects.

Xu et al. [95] reported that injecting O/W emulsions stabilized with NPs or surfactants is a promising option for (EOR) in harsh-condition reservoirs. They used microfluidic experiments to confirm that interaction between droplets caused by NPs in the thin liquid film between neighboring oil/water interfaces is enhanced, so the flow of emulsions stabilized by a NP/surfactant mixture shows droplet accumulation in high permeability regions, which was denser than the region stabilized by surfactant alone. Li et al. [83] prepared Pickering emulsion with clay particles as emulsifier, and tested its performance for water flooding under high salinity conditions. The results showed that clay particles were good emulsifiers, and stable emulsions could be formed at low concentrations. After water flooding in sandpack with higher permeability, the injection of Pickering emulsion mobilized more than 10% residual oil. The oil recovery ratio could be increased from 67% (water flooding) to over 80% by using Pickering emulsion for oil displacement. The emulsified gel system (Pickering emulsion) studied by Saikia et al. [96] could be effectively used in high temperature reservoir. The Pickering emulsion could maintain good stability at 105°C and provide required water flow resistance, and allow easy production of diesel oil in the core flooding experiment. The above research indicates that Pickering emulsion can be applied to harsh reservoirs such as high temperature and high salt to adjust water-sucked section.

3.2.3 Fracturing fluid

Emulsion fracturing fluid is a kind of fracturing fluid system developed in the 1970s which can be divided into W/O fracturing fluid and O/W fracturing fluid [97–99]. Among them, the water-in-oil emulsion fracturing fluid is suitable for the fracturing with water sensitive, low pressure, and low-permeability reservoirs [100–104]. Because of its high viscosity, strong sand suspension ability, low filtration loss, less residual sand, and low cost, it has developed rapidly in recent decades [103]. Compared with W/O emulsion fracturing fluid, Pickering emulsion has better temperature resistance and better stability when injected. In addition, if fracturing is performed in unconventional reservoir, the solid particles carried by Pickering emulsion can be adsorbed in the formation, which may achieve the effect of proppant [104].

Roberts et al. [105] studied the fracturing conditions and three different two-phase flow models of Pickering emulsion stabilized by surface-modified nanomaterials in Pickering emulsion fracturing, and conducted fracturing experiments in Boise block, and achieved certain results. Yang et al. [106] used Pickering emulsion stabilized by SiO2 nanomaterials for fracturing construction. It was found that proppant can be better suspended and the conductivity after fracturing is also more stable. Acid fracturing treatment is usually more successful and effective than hydraulic fracturing [107]. Pickering emulsion can also be used as an emulsified acid for acid fracturing. Emulsified acids have been used to improve the recovery of oil and gas in carbonate reservoirs through acid fracturing. Huang et al. [108] pointed out that very small particles, such as colloidal clay particles and/or NPs, can increase the stability of the emulsified acids over an elevated temperature range.

3.3 Sand control

Sand production in the reservoir has been acknowledged as a critical problem related to oil and gas fields’ exploitation for many years because it causes many serious problems in oil and gas production [109]. Sand production not only easily leads to production reduction and shutdown of oil wells, but also aggravates the wear of ground and downhole equipment, and even causes casing damage and oil well scrapping in severe cases. In order to ensure stable and high production in oil fields, some effective measures must be taken to solve the sand production of oil wells. Resin sand control technology is one of the common technical means for chemical sand control [110,111]. Although the commonly used sand-fixing resin of resin sand control has high consolidation strength, compared with Pickering emulsion resin, it has higher density, higher cost, poor permeability of the solidified body, and cannot meet the demand of the heterogeneous reservoir. Wang [112] selected nano-SiO2 as emulsifier, amino resin solution as aqueous phase, and kerosene as oil phase, and preferred a Pickering emulsion resin system. This emulsion sand consolidation system is especially suitable for silt fine sand reservoirs at 60°C. After being solidified at 60°C for 12 h, the strength of the consolidated core could reach 4.61–5.82 MPa, and the permeability could reach 3.12–5.34 μm2. This Pickering emulsion resin system had excellent water resistance, oil resistance, alkali resistance, and salt resistance. Ikem et al. [113] added nonionic surfactant and dispersant to premade Pickering emulsions that were stabilized by OA-modified SIO2 particles. They believed that this emulsion as an alternative to gravel packing can prepare void-free and mechanically sound permeable barriers in subterranean formations. Wang et al. prepared the low-temperature-emulsified sand consolidating agent with SIO2 NPs as emulsion stabilizer, cementing agent (melamine formaldehyde resin solution), curing agent (ammonium chloride), and coupling agent (silane coupling agent KH-550) as water phase and kerosene as oil phase. The sand consolidation agent could not only meet the sand control requirements of low-temperature formations, but also had the characteristics of high temperature resistance. It had a wide range of applications in sand control [114].

3.4 Petroleum wastewater treatment

Petroleum wastewater or oilfield wastewater refers to the water produced from oil wells with crude oil, including oilfield-produced water, sewage generated during drilling, and other forms of oily sewage. Oilfield-produced water is produced in the process of water flooding, which contains a large number of refractory organic pollutants and high concentration ions. If it fails to meet the standards of reinjection and direct discharge, it needs to be treated until it reaches the discharge standard [115,116]. The produced water of sulfur-containing oil fields contains hydrogen sulfide, which has corrosive effects. If the produced water of sulfur-containing oil fields is directly connected to the produced water treatment unit of oil field, it will cause corrosion of pipelines and equipment, and cause hidden dangers to safety production [117]. Meanwhile, the volatilization and precipitation of hydrogen sulfide will seriously affect personal safety. Therefore, it is necessary to remove sulfur from the produced water of sulfur-containing oil fields before treatment to ensure safe production. Dou and Wang [118] prepared an amphiphilic catalyst for oxidative desulfurization by loading the phosphotungstic active component ( PW 12 O 40 3 − ) on the bi-component carbon-organosilica Janus particles, and investigated its desulfurization ratio. The results showed that the final desulfurization ratio of the stable Pickering emulsion in the n-octane/acetonitrile system was 99.86%. This emulsion exhibited the best desulfurization performance, and compared with the conventional bi-phase system using H3PW12O40 as catalyst the desulfurization ratio increased sharply.

Pickering emulsion can also be used for oily sewage treatment. Some studies have pointed out that the switching Pickering emulsion has super stability, which can achieve rapid demulsification, recovery of internal phase, and the recycling of oil phase by triggering mechanism [119]. He et al. [120] prepared magnetically responsive Janus NPs by using hydrophobic ethyl cellulose, hydrophilic CMC, and Fe3O4 NPs as raw materials. This material could effectively separate emulsified water from water-in-crude oil emulsions and the oil from oily wastewater under an external magnetic field, and can be reused for five times. Shang et al. [121] prepared a cationic emulsion water clarifier by emulsion polymerization method using diallyl dimethyl ammonium chloride as cationic monomer, styrene and butyl acrylate as hydrophobic monomers, hexadecyl trimethyl ammonium bromide and polyoxyethylene octyl phenol ether as emulsifiers, and ammonium persulfate as initiator. The prepared Q20 emulsion water clarifier had good oil removal effect. When the concentration was 30 mg/L, the oilfield wastewater could be reduced from 295 mg/L to 13 mg/L. Zhang et al. [122] prepared the dual-responsive Pickering emulsion by using negatively charged Fe3O4 NPs in combination with 1-dodecyl-1H-imidazole (C12mim) as stabilizers. This Pickering emulsion was CO2/N2 and magnetic responsive, and could be used for oily sewage treatment.

4 Conclusion

In the petroleum industry, Pickering emulsion has many advantages and has great research value in the application of harsh reservoirs. Pickering emulsion has been effectively used in drilling, oil displacement, profile control and water shutoff, fracturing, sand control, petroleum wastewater treatment, etc. However, Pickering emulsion is still a relatively new field for the petroleum industry, which has not been widely used and still has great development potential. With the development of nanomaterial technology and in-depth study of Pickering emulsion, the application scope of Pickering emulsion in the petroleum industry will be expanded.

Pickering emulsion has good stability, which is not conducive to demulsification. In order to make it fully and widely used in the petroleum field, the demulsification technology of Pickering emulsion will be an important research direction. For example, the environmentally responsive Pickering emulsion will better promote the application of Pickering emulsion in the oil field.

In addition, developing a cheap and efficient Pickering emulsifier, which can better control the rheological property of the emulsion, will be the key to the wide application of Pickering emulsion in the oil and gas field. When Pickering emulsion is used in petroleum industry, the cost control is an important consideration. From laboratory research results to final field application, researchers need to make joint efforts.

  1. Funding information: National Natural Science Foundation of China (No. 51804045), the Science & Technology Program of Changzhou (No. CJ20200066), and Jiangsu Key Laboratory of Oil-gas Storage and Transportation Technology (No. CDYQCY202001).

  2. Author contributions: All authors have accepted responsibility for the entire content of this article and approved its submission.

  3. Conflict of interest: The authors state no conflict of interest.

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Received: 2021-09-12
Revised: 2021-10-05
Accepted: 2021-10-10
Published Online: 2021-12-03

© 2022 Lipei Fu et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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  3. Mechanical, morphological, and fracture-deformation behavior of MWCNTs-reinforced (Al–Cu–Mg–T351) alloy cast nanocomposites fabricated by optimized mechanical milling and powder metallurgy techniques
  4. Flammability and physical stability of sugar palm crystalline nanocellulose reinforced thermoplastic sugar palm starch/poly(lactic acid) blend bionanocomposites
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  7. In situ regulation of microstructure and microwave-absorbing properties of FeSiAl through HNO3 oxidation
  8. Research on a mechanical model of magnetorheological fluid different diameter particles
  9. Nanomechanical and dynamic mechanical properties of rubber–wood–plastic composites
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  12. N/S co-doped CoSe/C nanocubes as anode materials for Li-ion batteries
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https://doi.org/10.1515/ntrev-2022-0003
Keywords for this article
Pickering emulsion; influencing factors; petroleum industry application; emulsifier
Creative Commons
BY 4.0

Articles in the same Issue

  1. Research Articles
  2. Theoretical and experimental investigation of MWCNT dispersion effect on the elastic modulus of flexible PDMS/MWCNT nanocomposites
  3. Mechanical, morphological, and fracture-deformation behavior of MWCNTs-reinforced (Al–Cu–Mg–T351) alloy cast nanocomposites fabricated by optimized mechanical milling and powder metallurgy techniques
  4. Flammability and physical stability of sugar palm crystalline nanocellulose reinforced thermoplastic sugar palm starch/poly(lactic acid) blend bionanocomposites
  5. Glutathione-loaded non-ionic surfactant niosomes: A new approach to improve oral bioavailability and hepatoprotective efficacy of glutathione
  6. Relationship between mechano-bactericidal activity and nanoblades density on chemically strengthened glass
  7. In situ regulation of microstructure and microwave-absorbing properties of FeSiAl through HNO3 oxidation
  8. Research on a mechanical model of magnetorheological fluid different diameter particles
  9. Nanomechanical and dynamic mechanical properties of rubber–wood–plastic composites
  10. Investigative properties of CeO2 doped with niobium: A combined characterization and DFT studies
  11. Miniaturized peptidomimetics and nano-vesiculation in endothelin types through probable nano-disk formation and structure property relationships of endothelins’ fragments
  12. N/S co-doped CoSe/C nanocubes as anode materials for Li-ion batteries
  13. Synergistic effects of halloysite nanotubes with metal and phosphorus additives on the optimal design of eco-friendly sandwich panels with maximum flame resistance and minimum weight
  14. Octreotide-conjugated silver nanoparticles for active targeting of somatostatin receptors and their application in a nebulized rat model
  15. Controllable morphology of Bi2S3 nanostructures formed via hydrothermal vulcanization of Bi2O3 thin-film layer and their photoelectrocatalytic performances
  16. Development of (−)-epigallocatechin-3-gallate-loaded folate receptor-targeted nanoparticles for prostate cancer treatment
  17. Enhancement of the mechanical properties of HDPE mineral nanocomposites by filler particles modulation of the matrix plastic/elastic behavior
  18. Effect of plasticizers on the properties of sugar palm nanocellulose/cinnamon essential oil reinforced starch bionanocomposite films
  19. Optimization of nano coating to reduce the thermal deformation of ball screws
  20. Preparation of efficient piezoelectric PVDF–HFP/Ni composite films by high electric field poling
  21. MHD dissipative Casson nanofluid liquid film flow due to an unsteady stretching sheet with radiation influence and slip velocity phenomenon
  22. Effects of nano-SiO2 modification on rubberised mortar and concrete with recycled coarse aggregates
  23. Mechanical and microscopic properties of fiber-reinforced coal gangue-based geopolymer concrete
  24. Effect of morphology and size on the thermodynamic stability of cerium oxide nanoparticles: Experiment and molecular dynamics calculation
  25. Mechanical performance of a CFRP composite reinforced via gelatin-CNTs: A study on fiber interfacial enhancement and matrix enhancement
  26. A practical review over surface modification, nanopatterns, emerging materials, drug delivery systems, and their biophysiochemical properties for dental implants: Recent progresses and advances
  27. HTR: An ultra-high speed algorithm for cage recognition of clathrate hydrates
  28. Effects of microalloying elements added by in situ synthesis on the microstructure of WCu composites
  29. A highly sensitive nanobiosensor based on aptamer-conjugated graphene-decorated rhodium nanoparticles for detection of HER2-positive circulating tumor cells
  30. Progressive collapse performance of shear strengthened RC frames by nano CFRP
  31. Core–shell heterostructured composites of carbon nanotubes and imine-linked hyperbranched polymers as metal-free Li-ion anodes
  32. A Galerkin strategy for tri-hybridized mixture in ethylene glycol comprising variable diffusion and thermal conductivity using non-Fourier’s theory
  33. Simple models for tensile modulus of shape memory polymer nanocomposites at ambient temperature
  34. Preparation and morphological studies of tin sulfide nanoparticles and use as efficient photocatalysts for the degradation of rhodamine B and phenol
  35. Polyethyleneimine-impregnated activated carbon nanofiber composited graphene-derived rice husk char for efficient post-combustion CO2 capture
  36. Electrospun nanofibers of Co3O4 nanocrystals encapsulated in cyclized-polyacrylonitrile for lithium storage
  37. Pitting corrosion induced on high-strength high carbon steel wire in high alkaline deaerated chloride electrolyte
  38. Formulation of polymeric nanoparticles loaded sorafenib; evaluation of cytotoxicity, molecular evaluation, and gene expression studies in lung and breast cancer cell lines
  39. Engineered nanocomposites in asphalt binders
  40. Influence of loading voltage, domain ratio, and additional load on the actuation of dielectric elastomer
  41. Thermally induced hex-graphene transitions in 2D carbon crystals
  42. The surface modification effect on the interfacial properties of glass fiber-reinforced epoxy: A molecular dynamics study
  43. Molecular dynamics study of deformation mechanism of interfacial microzone of Cu/Al2Cu/Al composites under tension
  44. Nanocolloid simulators of luminescent solar concentrator photovoltaic windows
  45. Compressive strength and anti-chloride ion penetration assessment of geopolymer mortar merging PVA fiber and nano-SiO2 using RBF–BP composite neural network
  46. Effect of 3-mercapto-1-propane sulfonate sulfonic acid and polyvinylpyrrolidone on the growth of cobalt pillar by electrodeposition
  47. Dynamics of convective slippery constraints on hybrid radiative Sutterby nanofluid flow by Galerkin finite element simulation
  48. Preparation of vanadium by the magnesiothermic self-propagating reduction and process control
  49. Microstructure-dependent photoelectrocatalytic activity of heterogeneous ZnO–ZnS nanosheets
  50. Cytotoxic and pro-inflammatory effects of molybdenum and tungsten disulphide on human bronchial cells
  51. Improving recycled aggregate concrete by compression casting and nano-silica
  52. Chemically reactive Maxwell nanoliquid flow by a stretching surface in the frames of Newtonian heating, nonlinear convection and radiative flux: Nanopolymer flow processing simulation
  53. Nonlinear dynamic and crack behaviors of carbon nanotubes-reinforced composites with various geometries
  54. Biosynthesis of copper oxide nanoparticles and its therapeutic efficacy against colon cancer
  55. Synthesis and characterization of smart stimuli-responsive herbal drug-encapsulated nanoniosome particles for efficient treatment of breast cancer
  56. Homotopic simulation for heat transport phenomenon of the Burgers nanofluids flow over a stretching cylinder with thermal convective and zero mass flux conditions
  57. Incorporation of copper and strontium ions in TiO2 nanotubes via dopamine to enhance hemocompatibility and cytocompatibility
  58. Mechanical, thermal, and barrier properties of starch films incorporated with chitosan nanoparticles
  59. Mechanical properties and microstructure of nano-strengthened recycled aggregate concrete
  60. Glucose-responsive nanogels efficiently maintain the stability and activity of therapeutic enzymes
  61. Tunning matrix rheology and mechanical performance of ultra-high performance concrete using cellulose nanofibers
  62. Flexible MXene/copper/cellulose nanofiber heat spreader films with enhanced thermal conductivity
  63. Promoted charge separation and specific surface area via interlacing of N-doped titanium dioxide nanotubes on carbon nitride nanosheets for photocatalytic degradation of Rhodamine B
  64. Elucidating the role of silicon dioxide and titanium dioxide nanoparticles in mitigating the disease of the eggplant caused by Phomopsis vexans, Ralstonia solanacearum, and root-knot nematode Meloidogyne incognita
  65. An implication of magnetic dipole in Carreau Yasuda liquid influenced by engine oil using ternary hybrid nanomaterial
  66. Robust synthesis of a composite phase of copper vanadium oxide with enhanced performance for durable aqueous Zn-ion batteries
  67. Tunning self-assembled phases of bovine serum albumin via hydrothermal process to synthesize novel functional hydrogel for skin protection against UVB
  68. A comparative experimental study on damping properties of epoxy nanocomposite beams reinforced with carbon nanotubes and graphene nanoplatelets
  69. Lightweight and hydrophobic Ni/GO/PVA composite aerogels for ultrahigh performance electromagnetic interference shielding
  70. Research on the auxetic behavior and mechanical properties of periodically rotating graphene nanostructures
  71. Repairing performances of novel cement mortar modified with graphene oxide and polyacrylate polymer
  72. Closed-loop recycling and fabrication of hydrophilic CNT films with high performance
  73. Design of thin-film configuration of SnO2–Ag2O composites for NO2 gas-sensing applications
  74. Study on stress distribution of SiC/Al composites based on microstructure models with microns and nanoparticles
  75. PVDF green nanofibers as potential carriers for improving self-healing and mechanical properties of carbon fiber/epoxy prepregs
  76. Osteogenesis capability of three-dimensionally printed poly(lactic acid)-halloysite nanotube scaffolds containing strontium ranelate
  77. Silver nanoparticles induce mitochondria-dependent apoptosis and late non-canonical autophagy in HT-29 colon cancer cells
  78. Preparation and bonding mechanisms of polymer/metal hybrid composite by nano molding technology
  79. Damage self-sensing and strain monitoring of glass-reinforced epoxy composite impregnated with graphene nanoplatelet and multiwalled carbon nanotubes
  80. Thermal analysis characterisation of solar-powered ship using Oldroyd hybrid nanofluids in parabolic trough solar collector: An optimal thermal application
  81. Pyrene-functionalized halloysite nanotubes for simultaneously detecting and separating Hg(ii) in aqueous media: A comprehensive comparison on interparticle and intraparticle excimers
  82. Fabrication of self-assembly CNT flexible film and its piezoresistive sensing behaviors
  83. Thermal valuation and entropy inspection of second-grade nanoscale fluid flow over a stretching surface by applying Koo–Kleinstreuer–Li relation
  84. Mechanical properties and microstructure of nano-SiO2 and basalt-fiber-reinforced recycled aggregate concrete
  85. Characterization and tribology performance of polyaniline-coated nanodiamond lubricant additives
  86. Combined impact of Marangoni convection and thermophoretic particle deposition on chemically reactive transport of nanofluid flow over a stretching surface
  87. Spark plasma extrusion of binder free hydroxyapatite powder
  88. An investigation on thermo-mechanical performance of graphene-oxide-reinforced shape memory polymer
  89. Effect of nanoadditives on the novel leather fiber/recycled poly(ethylene-vinyl-acetate) polymer composites for multifunctional applications: Fabrication, characterizations, and multiobjective optimization using central composite design
  90. Design selection for a hemispherical dimple core sandwich panel using hybrid multi-criteria decision-making methods
  91. Improving tensile strength and impact toughness of plasticized poly(lactic acid) biocomposites by incorporating nanofibrillated cellulose
  92. Green synthesis of spinel copper ferrite (CuFe2O4) nanoparticles and their toxicity
  93. The effect of TaC and NbC hybrid and mono-nanoparticles on AA2024 nanocomposites: Microstructure, strengthening, and artificial aging
  94. Excited-state geometry relaxation of pyrene-modified cellulose nanocrystals under UV-light excitation for detecting Fe3+
  95. Effect of CNTs and MEA on the creep of face-slab concrete at an early age
  96. Effect of deformation conditions on compression phase transformation of AZ31
  97. Application of MXene as a new generation of highly conductive coating materials for electromembrane-surrounded solid-phase microextraction
  98. A comparative study of the elasto-plastic properties for ceramic nanocomposites filled by graphene or graphene oxide nanoplates
  99. Encapsulation strategies for improving the biological behavior of CdS@ZIF-8 nanocomposites
  100. Biosynthesis of ZnO NPs from pumpkin seeds’ extract and elucidation of its anticancer potential against breast cancer
  101. Preliminary trials of the gold nanoparticles conjugated chrysin: An assessment of anti-oxidant, anti-microbial, and in vitro cytotoxic activities of a nanoformulated flavonoid
  102. Effect of micron-scale pores increased by nano-SiO2 sol modification on the strength of cement mortar
  103. Fractional simulations for thermal flow of hybrid nanofluid with aluminum oxide and titanium oxide nanoparticles with water and blood base fluids
  104. The effect of graphene nano-powder on the viscosity of water: An experimental study and artificial neural network modeling
  105. Development of a novel heat- and shear-resistant nano-silica gelling agent
  106. Characterization, biocompatibility and in vivo of nominal MnO2-containing wollastonite glass-ceramic
  107. Entropy production simulation of second-grade magnetic nanomaterials flowing across an expanding surface with viscidness dissipative flux
  108. Enhancement in structural, morphological, and optical properties of copper oxide for optoelectronic device applications
  109. Aptamer-functionalized chitosan-coated gold nanoparticle complex as a suitable targeted drug carrier for improved breast cancer treatment
  110. Performance and overall evaluation of nano-alumina-modified asphalt mixture
  111. Analysis of pure nanofluid (GO/engine oil) and hybrid nanofluid (GO–Fe3O4/engine oil): Novel thermal and magnetic features
  112. Synthesis of Ag@AgCl modified anatase/rutile/brookite mixed phase TiO2 and their photocatalytic property
  113. Mechanisms and influential variables on the abrasion resistance hydraulic concrete
  114. Synergistic reinforcement mechanism of basalt fiber/cellulose nanocrystals/polypropylene composites
  115. Achieving excellent oxidation resistance and mechanical properties of TiB2–B4C/carbon aerogel composites by quick-gelation and mechanical mixing
  116. Microwave-assisted sol–gel template-free synthesis and characterization of silica nanoparticles obtained from South African coal fly ash
  117. Pulsed laser-assisted synthesis of nano nickel(ii) oxide-anchored graphitic carbon nitride: Characterizations and their potential antibacterial/anti-biofilm applications
  118. Effects of nano-ZrSi2 on thermal stability of phenolic resin and thermal reusability of quartz–phenolic composites
  119. Benzaldehyde derivatives on tin electroplating as corrosion resistance for fabricating copper circuit
  120. Mechanical and heat transfer properties of 4D-printed shape memory graphene oxide/epoxy acrylate composites
  121. Coupling the vanadium-induced amorphous/crystalline NiFe2O4 with phosphide heterojunction toward active oxygen evolution reaction catalysts
  122. Graphene-oxide-reinforced cement composites mechanical and microstructural characteristics at elevated temperatures
  123. Gray correlation analysis of factors influencing compressive strength and durability of nano-SiO2 and PVA fiber reinforced geopolymer mortar
  124. Preparation of layered gradient Cu–Cr–Ti alloy with excellent mechanical properties, thermal stability, and electrical conductivity
  125. Recovery of Cr from chrome-containing leather wastes to develop aluminum-based composite material along with Al2O3 ceramic particles: An ingenious approach
  126. Mechanisms of the improved stiffness of flexible polymers under impact loading
  127. Anticancer potential of gold nanoparticles (AuNPs) using a battery of in vitro tests
  128. Review Articles
  129. Proposed approaches for coronaviruses elimination from wastewater: Membrane techniques and nanotechnology solutions
  130. Application of Pickering emulsion in oil drilling and production
  131. The contribution of microfluidics to the fight against tuberculosis
  132. Graphene-based biosensors for disease theranostics: Development, applications, and recent advancements
  133. Synthesis and encapsulation of iron oxide nanorods for application in magnetic hyperthermia and photothermal therapy
  134. Contemporary nano-architectured drugs and leads for ανβ3 integrin-based chemotherapy: Rationale and retrospect
  135. State-of-the-art review of fabrication, application, and mechanical properties of functionally graded porous nanocomposite materials
  136. Insights on magnetic spinel ferrites for targeted drug delivery and hyperthermia applications
  137. A review on heterogeneous oxidation of acetaminophen based on micro and nanoparticles catalyzed by different activators
  138. Early diagnosis of lung cancer using magnetic nanoparticles-integrated systems
  139. Advances in ZnO: Manipulation of defects for enhancing their technological potentials
  140. Efficacious nanomedicine track toward combating COVID-19
  141. A review of the design, processes, and properties of Mg-based composites
  142. Green synthesis of nanoparticles for varied applications: Green renewable resources and energy-efficient synthetic routes
  143. Two-dimensional nanomaterial-based polymer composites: Fundamentals and applications
  144. Recent progress and challenges in plasmonic nanomaterials
  145. Apoptotic cell-derived micro/nanosized extracellular vesicles in tissue regeneration
  146. Electronic noses based on metal oxide nanowires: A review
  147. Framework materials for supercapacitors
  148. An overview on the reproductive toxicity of graphene derivatives: Highlighting the importance
  149. Antibacterial nanomaterials: Upcoming hope to overcome antibiotic resistance crisis
  150. Research progress of carbon materials in the field of three-dimensional printing polymer nanocomposites
  151. A review of atomic layer deposition modelling and simulation methodologies: Density functional theory and molecular dynamics
  152. Recent advances in the preparation of PVDF-based piezoelectric materials
  153. Recent developments in tensile properties of friction welding of carbon fiber-reinforced composite: A review
  154. Comprehensive review of the properties of fly ash-based geopolymer with additive of nano-SiO2
  155. Perspectives in biopolymer/graphene-based composite application: Advances, challenges, and recommendations
  156. Graphene-based nanocomposite using new modeling molecular dynamic simulations for proposed neutralizing mechanism and real-time sensing of COVID-19
  157. Nanotechnology application on bamboo materials: A review
  158. Recent developments and future perspectives of biorenewable nanocomposites for advanced applications
  159. Nanostructured lipid carrier system: A compendium of their formulation development approaches, optimization strategies by quality by design, and recent applications in drug delivery
  160. 3D printing customized design of human bone tissue implant and its application
  161. Design, preparation, and functionalization of nanobiomaterials for enhanced efficacy in current and future biomedical applications
  162. A brief review of nanoparticles-doped PEDOT:PSS nanocomposite for OLED and OPV
  163. Nanotechnology interventions as a putative tool for the treatment of dental afflictions
  164. Recent advancements in metal–organic frameworks integrating quantum dots (QDs@MOF) and their potential applications
  165. A focused review of short electrospun nanofiber preparation techniques for composite reinforcement
  166. Microstructural characteristics and nano-modification of interfacial transition zone in concrete: A review
  167. Latest developments in the upconversion nanotechnology for the rapid detection of food safety: A review
  168. Strategic applications of nano-fertilizers for sustainable agriculture: Benefits and bottlenecks
  169. Molecular dynamics application of cocrystal energetic materials: A review
  170. Synthesis and application of nanometer hydroxyapatite in biomedicine
  171. Cutting-edge development in waste-recycled nanomaterials for energy storage and conversion applications
  172. Biological applications of ternary quantum dots: A review
  173. Nanotherapeutics for hydrogen sulfide-involved treatment: An emerging approach for cancer therapy
  174. Application of antibacterial nanoparticles in orthodontic materials
  175. Effect of natural-based biological hydrogels combined with growth factors on skin wound healing
  176. Nanozymes – A route to overcome microbial resistance: A viewpoint
  177. Recent developments and applications of smart nanoparticles in biomedicine
  178. Contemporary review on carbon nanotube (CNT) composites and their impact on multifarious applications
  179. Interfacial interactions and reinforcing mechanisms of cellulose and chitin nanomaterials and starch derivatives for cement and concrete strength and durability enhancement: A review
  180. Diamond-like carbon films for tribological modification of rubber
  181. Layered double hydroxides (LDHs) modified cement-based materials: A systematic review
  182. Recent research progress and advanced applications of silica/polymer nanocomposites
  183. Modeling of supramolecular biopolymers: Leading the in silico revolution of tissue engineering and nanomedicine
  184. Recent advances in perovskites-based optoelectronics
  185. Biogenic synthesis of palladium nanoparticles: New production methods and applications
  186. A comprehensive review of nanofluids with fractional derivatives: Modeling and application
  187. Electrospinning of marine polysaccharides: Processing and chemical aspects, challenges, and future prospects
  188. Electrohydrodynamic printing for demanding devices: A review of processing and applications
  189. Rapid Communications
  190. Structural material with designed thermal twist for a simple actuation
  191. Recent advances in photothermal materials for solar-driven crude oil adsorption
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