Abstract
China’s annual production of ceramic tiles inevitably produces a large amount of ceramic tile waste, which causes environmental and land occupation problems. Using a high-volume ceramic tile waste to fabricate ultra high performance concrete (UHPC) will reduce the workability and mechanical properties but increase the low-carbon properties. Motivated by such mechanical and low-carbon properties, this study introduced inexpensive, spherical, low-carbon nano-CaCO3 (NC) to improve the workability and mechanical properties of UHPC with a high volume of ceramic tile waste powder and aggregate (UHPCHCTWPA). The results of this study indicated that NC can improve the workability but shortened the setting times of UHPCHCTWPA. NC also significantly increases the mechanical properties including compressive strength, compressive work, flexural strength, fracture energy, and ratio of flexural strength to compressive strength. It is due to that NC enhances the hydration rate and hydration degree, and optimizes hydration product orientation, size, and distribution. Moreover, compared with UHPC, the UHPCHCTWPA with NC reduces energy intensity, CO2 emission, and cost by more than 20%. Therefore, adding NC can make UHPCHCTWPA with good workability, mechanical and low-carbon properties and can effectively and quickly utilize ceramic tile waste.
1 Introduction
In China, there are many ceramic tiles production bases. The ceramic industry has made an important contribution to the development of the economy and society, but it has also resulted in a considerable amount of pollution from ceramic tile waste. At present, most tile wastes are disposed in open stacks or landfills, which easily cause secondary pollution and ecological and environmental problems. Therefore, it is urgent to address ceramic tile waste. As a kind of industrial waste, ceramic tile waste has a high hardness, strength, wear resistance, and oxidation resistance and has the potential to replace natural sand and gravel aggregates. Moreover, the main chemical components of ceramic tile waste are SiO2 and Al2O3. Additionally, finely ground ceramic tile waste powders (CTWPs) have been shown to have some pozzolanic activity and can be used as admixtures [1,2,3,4,5,6,7,8].
Recently, some studies have been done on the workability and mechanical properties of concrete fabricated with ceramic tile waste aggregate (CTWA) as coarse aggregates. Awoyera et al. [9] found that the slump of the concrete with CTWA gradually fell from 25 to 100%. Tavakoli et al. [10] used CTWA to replace sand when preparing concrete, and the results indicated that when the content of CTWA was 25%, the compressive strength of the concrete increased by 7.85% after curing for 28 days. Alves et al. [11] showed that the concrete strength was reduced the most when 50% of the sand was replaced by CTWA, with a compressive strength at 7 day reduced by 24.90% compared to the control group. Therefore, Liu et al. [12] concluded that the mechanical properties of concrete with CTWA are stronger than those of plain concrete when the CTWA replacement rate does not exceed 40%. In addition, scholars have used CTWPs as admixtures to fabricate green high-performance concrete (HPC) to study its working and mechanical properties. Matos et al. [13] showed that the mini slump of HPC with CTWPs progressively fell from 10 to 30%. Sondarva et al. [14] used 5% CTWPs to replace cement to fabricate HPC, and found its compressive strength and splitting tensile strength increased by 15.0 and 13.5% at 28 days due to the CTWPs replacement, respectively. Attaelmanan et al. [3] and El-Dieb and Kanaan [4] observed similar effects. Mohit and Sharifi [15] found that the compressive strength of HPC at 7 days decreased by 19.83% from 39.88 to 31.97 MPa with the increase in the CTWPs content. In summary, low contents of CTWA and CTWPs can enhance the working and mechanical properties of HPC, but high contents of CTWA and CTWPs may impair the properties. High contents of CTWA and CTWPs can be used to fabricate low-carbon concrete and thus quickly mitigate the ceramic tile waste accumulation problem if their negative effect on the working and mechanical properties can be solved.
Nanomaterials have been introduced into concrete and can improve the properties of concrete. Currently, the commonly used nanomaterials in concrete mainly include carbon nanomaterials, inorganic nonmetallic nanomaterials. and metal oxide nanomaterials [16,17,18,19]. Among these nanomaterials, nano-CaCO3 (NC) has the characteristics of low price, spherical shape, low-carbon, and good compatibility with concrete. Moreover, it has been proven that some kinds of NC can improve the working and mechanical properties of concrete. Cui et al. [20] studied the workability of sulphoaluminate cement-based reactive powder concrete incorporated with irregular NC, and the results indicated that adding irregular NC reduced the fluidity of reactive powder concrete. Yang et al. [21] explored the effect of spherical NC on the workablity of 3D printing concrete and found that the fluidity of 3D printing concrete can be increased by adding the spherical NC. Therefore, the shape of NC is one of the important factors affecting the workability of concrete. Nejad et al. [22] concluded that concrete with 0.5% NC had the greatest flexural strength, which has a 45.2% increase compared with the control group. Hakamy [23] found that concrete with 1% NC had the maximum flexural strength and fracture toughness and that its fracture toughness was enhanced by 40.0%. Hodhod and Zaki [24] found that the splitting tensile strength of concrete with 1% NC was highest, with a rise of 80.7%. Sato and Beaudoin [25] found that NC significantly accelerated the hydration of concrete containing large amounts of blast furnace slag and the elastic modulus of concrete with NC was 175.0% higher than that of plain concrete.
Therefore, this study used NC and high content of CTWPs and CTWA (55 and 100%, respectively) to design low-carbon ultra HPC (UHPC), i.e., UHPC with a high volume of ceramic tile waste powder and aggregate (UHPCHCTWPA). UHPCHCTWPA with 0–5% NC was fabricated. Its workability and mechanical properties were investigated. Moreover, the influence mechanisms of NC on UHPCHCTWPA behavior were explored using scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric (TG), and mercury injection pressure (MIP) analyses. Finally, the sustainability of UHPCHCTWPA with NC was analyzed through material sustainability indicators (MSIs).
2 Materials and test methods
2.1 Materials
The raw materials mainly included cement, CTWPs, CTWA, NC, steel fibers, superplasticizers, and water. The cement used was P·O 52.5, and its chemical composition is shown in Table 1. Moreover, the mean particle size of the cement is 20 μm and its particle size distribution curve is illustrated in Figure 1. The CTWPs were obtained by grinding the ceramic tile waste in a mill for 2 h. The chemical composition of the CTWPs is listed in Table 1. The mean particle size of the CTWPs (as shown in Figure 2(a)) were 10.16 μm and the particle size distribution of the CTWPs is also shown in Figure 1. It can be observed from Figure 1 that the particle size accumulation and particle size density distributions of the CTWPs are similar to those of cement. CTWA with the same chemical composition as CTWPs was used as a fine aggregate with a fineness modulus of 2.02, as shown in Figure 2(b). The NC is spherical (as shown in Figure 3), and was produced by CO2 from cement flue gases, with a particle size ranging from 60 to 80 nm. It is white slurry, and its solid content is approximately 71%. The copper-plated steel fibers are flat and straight (diameter is 0.2 mm, length is 13 mm, and tensile strength is ≥2,700 MPa). The solid content of the superplasticizers is 45%, and its water-reducing rate is ≥60%. Additionally, the water used meets the Chinese Concrete Water Standard JGJ63-2006 [26].
Main chemical compositions of cement and CTWPs (CTWA)
| Chemical composition | Cement (%) | CTWPs (CTWA) (%) |
|---|---|---|
| SiO2 | 22.35 | 78.3 |
| Al2O3 | 6.30 | 15.9 |
| CaO | 55.73 | 0.9 |
| Fe2O3 | 4.91 | — |
| Na2O | 0.07 | 1.9 |
| K2O | 0.68 | 2.1 |
| MgO | 2.84 | 0.8 |
| SO3 | 2.47 | — |
| R2O | — | — |
| Cl− | — | — |
| LOI | 1.15 | — |

Particle size of cement and CTWPs.

Images of (a) CTWPs and (b) CTWA.

SEM of NC.
2.2 Mix proportions
Table 2 lists the composition of UHPCHCTWPA with NC. The water-to-binder ratio of UHPCHCTWPA was fixed at 0.18. The weight of the CTWPs was 55% of the total binder materials. The copper-plated steel fibers were employed at 2 vol% for all the mixtures. The SP admixture was 2% of the mass of the binder materials. The NC was investigated at 0, 1, 2, 3, 4, and 5% by mass of the binder materials. A total of six groups of UHPCHCTWPA were fabricated by incorporating different NC contents.
UHPCHCTWPA with NC composition
| Specimen numbers | Binder materials | CTWA | Water | NC (wt%) | Steel fibers (vol%) | Superplasticizers (wt%) | |
|---|---|---|---|---|---|---|---|
| Cement | CTWPs | ||||||
| 0% NC | 0.45 | 0.55 | 1 | 0.18 | 0 | 2 | 2 |
| 1% NC | 0.45 | 0.55 | 1 | 0.18 | 1 | 2 | 2 |
| 2% NC | 0.45 | 0.55 | 1 | 0.18 | 2 | 2 | 2 |
| 3% NC | 0.45 | 0.55 | 1 | 0.18 | 3 | 2 | 2 |
| 4% NC | 0.45 | 0.55 | 1 | 0.18 | 4 | 2 | 2 |
| 5% NC | 0.45 | 0.55 | 1 | 0.18 | 5 | 2 | 2 |
2.3 Specimen preparation
Figure 4 shows the preparation method for UHPCHCTWPA with NC. To uniformly disperse the NC, superplasticizers were added to the water as a dispersion agent and mixed with NC, after that, the mixed solution was treated by ultrasonic treatment and high-speed shearing for 10 min. The size of oiled molds is 40 mm × 40 mm × 160 mm. The curing condition of specimens is in tap water at (20 ± 1)°C for 3, 7, and 28 days.

Mixing process of UHPCHCTWPA with NC.
2.4 Test methods
2.4.1 Fresh properties
In this study, the fresh properties of UHPCHCTWPA with NC were characterized by workability and setting times. The fluidity was tested in accordance with GB/T 50080-2016 of China [27], and the setting time tests were conducted according to GB/T 1346-2011 of China [28].
2.4.2 Mechanical properties
At 3, 7, and 28 days, the mechanical properties of UHPCHCTWPA with NC were tested. The loading rates of the compressive and flexural strengths were 0.1 mm/min and 1.2 mm/min, respectively. The specimen size for three-point bending fracture was also 40 mm × 40 mm × 160 mm and the dimensions of the middle crack are 2 mm in width and 10 mm in height. The loading rate of three-point bending fracture test was 0.1 mm/min. The fracture energy was calculated according to equation (1) [29]. In addition, the method and steps for testing compressive toughness were the same as the compressive strength, and the compressive work was calculated according to equation (2) [30].
where G F is the fracture energy, δ 0 is the value of the deflection at the point of reverse bending in the load‒deflection curve, h is the height of the specimen cross-section (m), a 0 is the height of the prefabricated crack (m), and t is the width of the specimen cross-section (m).
where G c is the compressive work, and δ 0 is the value of the deflection at the point of reverse bending in the load‒deflection curve.
2.4.3 XRD analysis
The physical phase analysis of the UHPCHCTWPA with NC at 3 and 28 days was performed using an XRD-6100 X-ray diffractometer in the scan range of 10°–90°. The CH crystal orientation was calculated according to equation (3) [31], and the crystallite size of CH was obtained using equation (4).
where I CH is the selective orientation degree of CH, and I 001 and I 101 are the diffraction peak intensity of the CH at (001) and (101) crystal plane, respectively.
where D is the crystallite size of CH, K is the Scheele’s constant and taken as 0.89, λ is the wavelength of X-rays, B is the half-height width of the diffraction peak (rad), and θ is the diffraction angle.
2.4.4 SEM analysis
The interfacial transition zone (ITZ) of UHPCHCTWPA with NC was obtained using a HITACHI SU8010 ESEM at 3 and 28 days. Specimens were cut into small pieces and soaked in anhydrous ethanol for more than 7 days before testing to stop the hydration of the cement.
2.4.5 TG analysis
TG analysis was performed on the UHPCHCTWPA with NC at 3 and 28 days using a Perkin Elmer TGA 4000 TG analyzer. Before the test, the samples were dried at 50°C to a constant weight. The samples were heated from 50 to 1,000°C in nitrogen gas at a heating rate of 10°C/min. The hydration degree of UHPCHCTWPA with NC was calculated by equations (5) [32] and (6) [33].
where M Water is the mass of nonevaporable water (g), M 105 is the mass of UHPCHCTWPA with NC paste after heat treatment at 105°C for 2 h (g), M 1,000 is the mass of UHPCHCTWPA with NC paste after heat treatment at 1,000°C for 2 h (g), and M CaCO3 is the mass change of UHPCHCTWPA with NC paste caused by the decomposition of CaCO3 during heating (g). Then, the hydration degree of UHPCHCTWPA with NC paste was calculated using equation (6) [33].
where β t is the 1 g cement hydration degree at hydration time t (%) and M Water-Complete is the mass of water required for the complete hydration of 1 g cement (g). According to the survey results in the study by Pane and Hansen [33], the M Water-Complete used in this study was 0.256 g.
2.4.6 MIP analysis
An MIP test using an AutoPore IV 9500 was conducted to evaluate the pore structure of the UHPCHCTWPA with NC at 3 and 28 days. The measurable pore diameter ranged from 3 nm to 800 μm, and the test instrument pressurization ranged from 30 to 60,000 psi (i.e., 0.2–413.7 MPa). In addition, the liquid surface tension σ was taken as 0.485 N/m, and the contact angle θ was taken as 130° to obtain the pore size distribution and total porosity of UHPCHCTWPA with NC.
3 Results and discussion
3.1 Workability and setting time
Figure 5 illustrates the spread-flow value of UHPCHCTWPA with NC. It can be observed from Figure 5 that the spread-flow value of UHPCHCTWPA increased from 545 to 810 mm with the increase in NC content. The regression curves were obtained by linear fitting of the data points, indicating that the spread-flow value increased linearly with the NC content. The spread-flow value of UHPCHCTWPA with 5% NC increased by 48.62% compared to UHPCHCTWPA without NC. NC mainly affects the workability of UHPCHCTWPA through the water absorption effect, ball effect, and replacement effect. Moreover, the ball effect and replacement effect of NC in freshly mixed UHPCHCTWPA were more significant than the water absorption effect. Therefore, NC increased the workability of UHPCHCTWPA [34,35].

Spread-flow value.
Figure 6 presents the setting times of pastes containing NC. As shown in Figure 6, the initial and final setting times decreased as the NC content increased. The initial and final setting times of the UHPCHCTWPA with 5% NC were 8.6 and 9.2 h, respectively, which were 29.5 and 31.7% lower than those of the UHPCHCTWPA without NC. This reduction in setting time did not seem to level off, and the setting time may be further reduced with higher NC content. This may be due to NC having high specific surface area, which can significantly increase in nucleation sites in cement matrix. Due to the nano-core effect, NC can adsorb hydration products and accelerate the hydration of cement and form more hydration products, thus shortening the setting times [34,35,36,37].

Setting times.
3.2 Mechanical properties
3.2.1 Compressive strength
The compressive strength of UHPCHCTWPA with various NC contents is shown in Figure 7. Generally, it can be observed from Figure 7 that the compressive strength of UHPCHCTWPA with various NC increases with the increase in curing age. At the same curing age, the compressive strength of UHPCHCTWPA generally showed a parabolic growth tendency with the increase in NC content. When the NC content is 2%, the compressive strength of UHPCHCTWPA was the highest with an increase of 15.2, 14.7, and 17.1% at 3, 7, and 28 days, respectively. With 5% NC content, the compressive strength of UHPCHCTWPA had the lowest rates of increase of 3.6, 7.3, and 6.4% at 3, 7, and 28 days, respectively, but their compressive strengths were still higher than that of UHPCHCTWPA without NC at all curing ages. This indicated that NC has a positive effect on the compressive strength of UHPCHCTWPA.

The compressive strength and increase rate of the compressive strength of UHPCHCTWPA with NC. (a) Compressive strength. (b) Rate of increase.
3.2.2 Compressive deformation and compressive toughness
The compressive load–displacement curves and compressive work of UHPCHCTWPA with various NC are shown in Figure 8. As shown in Figure 8(a), all specimens were in the elastic phase under relatively small compressive loads at 3 days. As the load increased, the rising phase of the load‒deformation curve gradually moved toward the x-axis, indicating that the UHPCHCTWPA with NC entered the plastic deformation phase. Moreover, NC can increase the peak displacement of UHPCHCTWPA at 3 days. Figure 8(b) presents that the compressive work of UHPCHCTWPA first increased and then decreased as the NC content increased. Compared with UHPCHCTWPA without NC, the compressive work of UHPCHCTWPA with 2 and 3% NC increased by 30.1 and 30.7%, respectively. The compressive load‒displacement curves at 28 days are shown in Figure 8(c). As shown in Figure 8(c), the evolution behavior of the compressive load–displacement curves were similar to that in Figure 8(a). However, the peak load of NC with different dosages is higher than that at 3 days. The compressive work of UHPCHCTWPA with NC at 28 days is shown in Figure 8(d). The compressive work of UHPCHCTWPA with 2% NC was 590.2 J, and its rate of increase was 20.1% compared to UHPCHCTWPA without NC. It can be concluded that NC can effectively enhance the compressive toughness of UHPCHCTWPA and that UHPCHCTWPA with 2% NC had the best toughening effect on UHPCHCTWPA at 3 and 28 days.

Compressive load‒deflection curves and the rate of increase in the compressive work of UHPCHCTWPA with NC. (a) Compressive load‒deflection curves at 3 days. (b) Compressive work at 3 days. (c) Compressive load‒deflection curves at 28 days. (d) Compressive work at 28 days.
3.2.3 Flexural strength
Figure 9 presents the flexural strength and its increase rate of UHPCHCTWPA with NC. As demonstrated in Figure 9, the flexural strengths of UHPCHCTWPA with various NC increased with the increase in the curing age. When the NC content increased, the flexural strength of UHPCHCTWPA first increases and then decreases at the same curing age. Among them, the flexural strength of UHPCHCTWPA with 1% NC was the largest, and the growth rates were 38.5, 29.4, and 34.9 at 3, 7, and 28 days, respectively. Additionally, the increase rate in the flexural strength of UHPCHCTWPA with 2% NC was the smallest, and the corresponding rates of increase were 29.9, 12.6, and 8.2% at 3, 7, and 28 days, respectively, but their flexural strengths were still higher than that of the plain UHPCHCTWPA at all curing ages. Overall, NC had a positive effect on the flexural strength of UHPCHCTWPA especially at the early age.

The flexural strength and its increase rate of UHPCHCTWPA with NC. (a) Flexural strength. (b) Rate of increase.
3.2.4 Flexural deformation and fracture energy
The flexural load‒deflection curves and fracture energy of UHPCHCTWPA made with various NC contents are illustrated in Figure 10. Figure 10(a) shows that the load‒deflection curves of UHPCHCTWPA with NC exhibit the same variation pattern. The increase in NC content could greatly improve the deflection-hardening behavior of UHPCHCTWPA. Meanwhile, the incorporation of NC increased the peak fracture load of the UHPCHCTWPA. This means that NC can improve the fracture behavior of UHPCHCTWPA with NC. According to Figure 10(b), the fracture energy of UHPCHCTWPA showed a parabolic trend with the increase in the NC content. The fracture energies of UHPCHCTWPA with 1, 3, and 4% NC were 6450.1, 6559.7, and 6396.2 J/m2, respectively. Their rates of increase were 27.5, 29.7, and 26.4, respectively. The flexural load‒displacement curves at 28 days are shown in Figure 10(c). As shown in Figure 10(a) and (c), the changing patterns of the flexural load‒displacement curves are similar. However, the peak load and ultimate displacement of NC with different dosages were higher than those at 3 days. In Figure 10(d), the fracture energy of UHPCHCTWPA with 4% NC was 13372.5 J/m2, and its rate of increase was 33.0% compared to UHPCHCTWPA without NC. Therefore, UHPCHCTWPA with NC can withstand higher loads without expanding the microcrack extension [36]. In addition, NC could effectively enhance the flexural toughness of UHPCHCTWPA, and UHPCHCTWPA with 4% NC had the best toughening effect on UHPCHCTWPA at 3 and 28 days.

Fracture load‒deflection curves and fracture energy of UHPCHCTWPA with NC. (a) Fracture load‒deflection curves at 3 days. (b) Fracture energy at 3 days. (c) Fracture load‒deflection curves at 28 days. (d) Fracture energy at 28 days.
3.2.5 Flexural strength to compressive strength ratio
Figure 11 presents the flexural strength to compressive strength ratio of UHPCHCTWPA with NC and their rates of increase. It can be observed from Figure 11 that the ratio of flexural strength to compressive strength of UHPCHCTWPA first increased then decreased as the NC content increased. On adding 1% NC, the ratio of flexural strength to compressive strength of UHPCHCTWPA increased by 27.1, 18.2, and 26.9% at 3, 7, and 28 days, respectively. With 2% NC, this ratio increased by 12.8% at 3 days and decreased at 7 and 28 days, but the decreases were insignificant. Therefore, it could be concluded that a suitable content of NC can improve the ratio of flexural strength to compressive strength of UHPCHCTWPA, thus enhancing its flexibility.

The ratio of flexural strength to compressive strength and its increase rate of UHPCHCTWPA with NC. (a) Flexural strength to compressive strength ratio. (b) Rate of increase.
3.3 Mechanistic analysis
3.3.1 XRD analysis
The XRD patterns were used to investigate the effect of NC on the physical phase characteristics of the hydration products of UHPCHCTWPA. Figure 12 presents the XRD patterns of UHPCHCTWPA with 0, 1, and 4% NC after curing for 3 and 28 days. As shown in Figure 12, the incorporation of NC did not affect the type of hydration products of UHPCHCTWPA. However, it can be observed from Figure 13 that adding NC can decrease the crystal orientation of the CH, where the crystal orientation of the CH could significantly reduce the crystal orientation of UHPCHCTWPA with 1% NC at 3 days by 40.8%. Moreover, as per the crystallite size of CH shown in Figure 14, it can be found that the crystallite size of the CH in the UHPCHCTWPA with NC was smaller than that in the plain UHPCHCTWPA. The crystallite size of CH in UHPCHCTWPA with 4% NC was 251 Å, which was 27.7% lower than that in UHPCHCTWPA without NC at 3 days. Figure 13 also shows that the crystallite size of the CH in the UHPCHCTWPA with 1% NC was 261 Å at 28 days, which was 28.7% lower than the crystallite size of the CH in the UHPCHCTWPA without NC. In other words, the incorporation of NC decreased the crystal orientation and crystallite size of the CH. This result indicated that the structure of UHPCHCTWPA with NC is very dense and has excellent mechanical properties on a macroscopic scale.

XRD patterns. (a) At 3 days. (b) At 28 days.

Crystal orientation of CH.

Crystallite size of CH.
3.3.2 SEM analysis
Figure 15 presents SEM images of the ITZs of UHPCHCTWPA with 0, 1, and 4% NC at 3 and 28 days. In addition, Image J software was used to segment the SEM images with bars, and the width of the ITZ was characterized by the average grayscale value of the bars as shown in Figure 16. It can be observed from Figure 16 that the ITZ width gradually became narrower with the greater incorporation of NC and longer curing age. Compared to those of UHPCHCTWPA without NC at 3 and 28 days, the ITZ widths of the UHPCHCTWPA with 4% NC were reduced by 46.3 and 55.2%, respectively. Due to the high surface energy, NC can absorb hydration products and finally formed a large number of nanocore-shell elements. Therefore, the pores between the aggregate and slurry filled, making the matrix structure much denser [37,38,39]. Therefore, NC optimized the ITZs of UHPCHCTWPA and improved its mechanical properties.

SEM images of ITZs.

ITZ widths.
3.3.3 TG analysis
Figure 17 presents the TG/DTG analysis curves of UHPCHCTWPA with 0, 1, and 4% NC at 3 and 28 days. Additionally, the hydration degree of the UHPCHCTWPA with NC was calculated based on the TG/DTG analysis curves, as shown in Figure 18. It was clearly noted from Figure 18 that the hydration degree of UHPCHCTWPA can be significantly enhanced by using NC. The hydration degrees of the UHPCHCTWPA with 1 and 4% NC increased by 60.8 and 87.0% at 3 days, respectively. However, the incorporation of NC had little influence on the hydration degree at 28 days, and the fluctuation range was within ±6%. Therefore, the early mechanical properties of UHPCHCTWPA may be enhanced mainly due to the effect of NC on the degree of hydration [24,38,40,41].

TG/DTG diagram at 3 and 28 days. (a) TG diagram at 3 days. (b) DTG diagram at 28 days. (c) TG diagram at 28 days. (d) DTG diagram at 28 days.

Hydration degree.
3.3.4 MIP analysis
Figures 19 and 20 present the differential cumulative pore size distribution curves and pore size distribution curves of the UHPCHCTWPA with 0, 1, and 4% NC at 3 and 28 days, respectively. It can be seen from Figures 19 and 20 that the most available pore sizes of UHPCHCTWPA were mainly concentrated in the range of 10–100 nm. The peak value of most available pore sizes for UHPCHCTWPA with 4% NC is higher than that of UHPCHCTWPA without NC at 7 days, but the most available pore sizes for UHPCHCTWPA with 4% NC is smaller than that of UHPCHCTWPA without NC at 28 days. Moreover, the peak value greater than 10,000 nm for UHPCHCTWPA with NC is lower than that of UHPCHCTWPA without NC at 7 and 28 days. Figure 21 shows the specific volume proportion of different pores of the UHPCHCTWPA with 0, 1, and 4% NC. As shown in Figure 21, the percentage of the <20 nm pore volume increased from 17.07 to 24.88% and the percentage of the >200 nm pore volume decreased from 64.53 to 37.78% in the UHPCHCTWPA with 4% NC at 3 days compared with the plain UHPCHCTWPA. Moreover, the percentage of the <20 nm pore volume increased from 15.07 to 68.43%, and the percentage of the >200 nm pore volume decreased from 34.87 to 13.03% in the UHPCHCTWPA with 4% NC at 28 days compared to the UHPCHCTWPA without NC. Therefore, NC could reduce large micropores and increase small micropores of UHPCHCTWPA. Figure 22 shows the porosity of UHPCHCTWPA with 0, 1, and 4% NC. Figure 22 shows that the porosity was 13.98 and 11.46% for the UHPCHCTWPA with 4% NC at 3 and 28 days, which was reduced by 33.8 and 35.8% compared to the UHPCHCTWPA without NC, respectively. NC can optimize the porosity size and effectively reduce the porosity of UHPCHCTWPA due to the nano-core effect [42], which makes UHPCHCTWPA more uniform and denser and improves the mechanical properties.

Cumulative pore size distribution curve. (a) At 3 days. (b) At 28 days.

Differential pore size distribution curve. (a) At 3 days. (b) At 28 days.

Pore volume ratio.

Porosity.
3.4 Environmental impact and cost analysis
The study uses the MSIs method to quantitatively evaluate the environmental impact of UHPCHCTWPA with NC. The MSIs are determined based on the material and energy flow in the manufacturing process, and are represented by the energy intensity and CO2 emissions [43,44].
Table 3 lists the energy consumption, CO2 emission, and unit price of the raw materials. The energy and CO2 emission of CTWPs and CTWA were calculated during their processing, and the price included the cost of laboratory processing and the cost of recycled materials. In addition, the production of NC can absorb CO2 from cement flue gases and the production of NC. According to the research of Batuecas et al. [45], producing 1 kg of material consists of 98% Portland cement and 2% NC produces 0.3 kg CO2 whereas producing 1 kg of Portland cement produces 0.96 kg CO2. It can be calculated that 1 kg of NC produced by this technology can reduce CO2 emission by 32.04 kg. Therefore, the carbon intensity of NC is negative. Table 4 presents the MSIs and cost comparison of UHPC and UHPCHCTWPA with NC. It can be observed from Table 4 that the energy intensity and cost of UHPCHCTWPA increase gradually as the NC content increases but it is still lower than UHPC. Moreover, it is worth noting that the CO2 emission decreases gradually when the NC content increases. As shown in Figure 23, compared with UHPC, the UHPCHCTWPA with NC reduces energy intensity and cost by more than 20%. Combined with the mechanical properties in this study, UHPCHCTWPA with 1 and 4% NC are relatively optimal. The CO2 emission of UHPCHCTWPA with 1 and 4% NC is reduced by 22.5 and 30.8% respectively compared with UHPC. Therefore, UHPCHCTWPA with NC is green and sustainable. If applied to industrial production rather than laboratory production, the MSIs and cost will be further reduced.
MSIs and cost data of raw materials
| Materials | Energy intensity (MJ/kg) | CO2 emission (kg/kg) | Cost (RMB/ton) |
|---|---|---|---|
| Cement | 5.5 | 0.96 | 680 |
| Silica sand | 0.081 | 0.0048 | 600 |
| Silica fume | 0.1 | 0.008 | 900 |
| CTWP | 1.4 | 0.37 | 360 |
| CTWA | 0.006 | 0.0015 | 200 |
| Water | 0.001 | 0.00 | 2 |
| NC | 25.56 | -32.04 | 870 |
| Steel fibers | 17.68 | 2.20 | 10,000 |
| SP | 0.30 | 0.028 | 10,000 |
MSIs and cost comparison of UHPC and UHPCHCTWPA with NC
| Type of concrete | Energy intensity (MJ/m3) | CO2 emission (kg/m3) | Cost (RMB/ton) |
|---|---|---|---|
| UHPC (90% cement + 100% silica sand + 10% silica fume + steel fibers + water + SP) | 8505.71 | 1333.65 | 3067.08 |
| UHPCHCTWPA with 1% NC | 6480.67 | 1032.91 | 2386.99 |
| UHPCHCTWPA with 2% NC | 6507.63 | 996.38 | 2388.21 |
| UHPCHCTWPA with 3% NC | 6524.59 | 959.85 | 2389.42 |
| UHPCHCTWPA with 4% NC | 6541.55 | 923.32 | 2390.64 |
| UHPCHCTWPA with 5% NC | 6558.51 | 886.79 | 2391.86 |

The rate of decrease in the energy intensity, CO2 emission, and cost of UHPCHCTWPA with NC compared with HPC.
4 Conclusion
In this study, the effect of NC on the workability and mechanical properties of UHPCHCTWPA was explored in terms of its spread-flow value, setting time, flexural strength, fracture toughness, compressive strength, compressive toughness, and ratio of flexural strength to compressive strength. The mechanisms of NC on the mechanical properties of UHPCHCTWPA was elaborated by XRD, SEM, TG, and MIP analyses. Finally, the sustainability of UHPCHCTWPA with NC was analyzed through MSIs and cost, and findings obtained from this study are as follows.
The UHPCHCTWPA with NC increased the workability by 48.62% but shortened the initial and final setting times by 29.5 and 31.7%, respectively.
The incorporation of NC was effective in improving mechanical properties of UHPCHCTWPA. The compressive strength, compressive work, flexural strength, fracture energy, and ratio of flexural strength to compressive strength increased by 17.1, 30.7, 38.5, 33.0, and 27.1%, respectively.
NC can accelerate the hydration rate and increase the hydration degree by 87% and reduce the selective orientation of CH by 40.8%, the crystallite size of CH by 28.7%, the ITZ width by 55.2%, and the porosity by 35.80%. Thus, the incorporation of NC can enhance the mechanical properties of UHPCHCTWPA.
By adding CTWPs, CTWA, and low-carbon NC, the environmental impacts and cost of UHPC can be significantly reduced. Compared with UHPC, the energy intensity and cost of UHPCHCTWPA with NC were both reduced by more than 20%. Even CO2 emission had fallen by more than 30%.
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Funding information: This study was funded by the National Natural Science Foundation of China (52368031 and 52368016), China Postdoctoral Science Foundation (2022M713497), Natural Science Foundation of Jiangxi Province (20224BAB204067), State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University (HJGZ2022201).
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Author contributions: Liqing Zhang: investigation, data curation, writing – review and editing, and funding support; Mingqiang Bian: investigation, data curation, writing – original draft, and writing – review and editing; Zhenrong Xiao: data curation and writing – original draft; Yunyang Wang: methodology, validation, and writing –review; Kaicheng Xu: methodology, supervision, and funding support; Baoguo Han: writing – review, methodology, and validation; Hong Huang: supervision and funding support. All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Conflict of interest: The authors state no conflict of interest.
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Data availability statement: All data generated or analysed during this study are included in this published article.
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- Special Issue on Green Mono, Bi and Tri Metallic Nanoparticles for Biological and Environmental Applications
- Tracking success of interaction of green-synthesized Carbopol nanoemulgel (neomycin-decorated Ag/ZnO nanocomposite) with wound-based MDR bacteria
- Green synthesis of copper oxide nanoparticles using genus Inula and evaluation of biological therapeutics and environmental applications
- Biogenic fabrication and multifunctional therapeutic applications of silver nanoparticles synthesized from rose petal extract
- Metal oxides on the frontlines: Antimicrobial activity in plant-derived biometallic nanoparticles
- Controlling pore size during the synthesis of hydroxyapatite nanoparticles using CTAB by the sol–gel hydrothermal method and their biological activities
- Special Issue on State-of-Art Advanced Nanotechnology for Healthcare
- Applications of nanomedicine-integrated phototherapeutic agents in cancer theranostics: A comprehensive review of the current state of research
- Smart bionanomaterials for treatment and diagnosis of inflammatory bowel disease
- Beyond conventional therapy: Synthesis of multifunctional nanoparticles for rheumatoid arthritis therapy
Articles in the same Issue
- Research Articles
- Tension buckling and postbuckling of nanocomposite laminated plates with in-plane negative Poisson’s ratio
- Polyvinylpyrrolidone-stabilised gold nanoparticle coatings inhibit blood protein adsorption
- Energy and mass transmission through hybrid nanofluid flow passing over a spinning sphere with magnetic effect and heat source/sink
- Surface treatment with nano-silica and magnesium potassium phosphate cement co-action for enhancing recycled aggregate concrete
- Numerical investigation of thermal radiation with entropy generation effects in hybrid nanofluid flow over a shrinking/stretching sheet
- Enhancing the performance of thermal energy storage by adding nano-particles with paraffin phase change materials
- Using nano-CaCO3 and ceramic tile waste to design low-carbon ultra high performance concrete
- Numerical analysis of thermophoretic particle deposition in a magneto-Marangoni convective dusty tangent hyperbolic nanofluid flow – Thermal and magnetic features
- Dual numerical solutions of Casson SA–hybrid nanofluid toward a stagnation point flow over stretching/shrinking cylinder
- Single flake homo p–n diode of MoTe2 enabled by oxygen plasma doping
- Electrostatic self-assembly effect of Fe3O4 nanoparticles on performance of carbon nanotubes in cement-based materials
- Multi-scale alignment to buried atom-scale devices using Kelvin probe force microscopy
- Antibacterial, mechanical, and dielectric properties of hydroxyapatite cordierite/zirconia porous nanocomposites for use in bone tissue engineering applications
- Time-dependent Darcy–Forchheimer flow of Casson hybrid nanofluid comprising the CNTs through a Riga plate with nonlinear thermal radiation and viscous dissipation
- Durability prediction of geopolymer mortar reinforced with nanoparticles and PVA fiber using particle swarm optimized BP neural network
- Utilization of zein nano-based system for promoting antibiofilm and anti-virulence activities of curcumin against Pseudomonas aeruginosa
- Antibacterial effect of novel dental resin composites containing rod-like zinc oxide
- An extended model to assess Jeffery–Hamel blood flow through arteries with iron-oxide (Fe2O3) nanoparticles and melting effects: Entropy optimization analysis
- Comparative study of copper nanoparticles over radially stretching sheet with water and silicone oil
- Cementitious composites modified by nanocarbon fillers with cooperation effect possessing excellent self-sensing properties
- Confinement size effect on dielectric properties, antimicrobial activity, and recycling of TiO2 quantum dots via photodegradation processes of Congo red dye and real industrial textile wastewater
- Biogenic silver nanoparticles of Moringa oleifera leaf extract: Characterization and photocatalytic application
- Novel integrated structure and function of Mg–Gd neutron shielding materials
- Impact of multiple slips on thermally radiative peristaltic transport of Sisko nanofluid with double diffusion convection, viscous dissipation, and induced magnetic field
- Magnetized water-based hybrid nanofluid flow over an exponentially stretching sheet with thermal convective and mass flux conditions: HAM solution
- A numerical investigation of the two-dimensional magnetohydrodynamic water-based hybrid nanofluid flow composed of Fe3O4 and Au nanoparticles over a heated surface
- Development and modeling of an ultra-robust TPU-MWCNT foam with high flexibility and compressibility
- Effects of nanofillers on the physical, mechanical, and tribological behavior of carbon/kenaf fiber–reinforced phenolic composites
- Polymer nanocomposite for protecting photovoltaic cells from solar ultraviolet in space
- Study on the mechanical properties and microstructure of recycled concrete reinforced with basalt fibers and nano-silica in early low-temperature environments
- Synergistic effect of carbon nanotubes and polyvinyl alcohol on the mechanical performance and microstructure of cement mortar
- CFD analysis of paraffin-based hybrid (Co–Au) and trihybrid (Co–Au–ZrO2) nanofluid flow through a porous medium
- Forced convective tangent hyperbolic nanofluid flow subject to heat source/sink and Lorentz force over a permeable wedge: Numerical exploration
- Physiochemical and electrical activities of nano copper oxides synthesised via hydrothermal method utilising natural reduction agents for solar cell application
- A homotopic analysis of the blood-based bioconvection Carreau–Yasuda hybrid nanofluid flow over a stretching sheet with convective conditions
- In situ synthesis of reduced graphene oxide/SnIn4S8 nanocomposites with enhanced photocatalytic performance for pollutant degradation
- A coarse-grained Poisson–Nernst–Planck model for polyelectrolyte-modified nanofluidic diodes
- A numerical investigation of the magnetized water-based hybrid nanofluid flow over an extending sheet with a convective condition: Active and passive controls of nanoparticles
- The LyP-1 cyclic peptide modified mesoporous polydopamine nanospheres for targeted delivery of triptolide regulate the macrophage repolarization in atherosclerosis
- Synergistic effect of hydroxyapatite-magnetite nanocomposites in magnetic hyperthermia for bone cancer treatment
- The significance of quadratic thermal radiative scrutinization of a nanofluid flow across a microchannel with thermophoretic particle deposition effects
- Ferromagnetic effect on Casson nanofluid flow and transport phenomena across a bi-directional Riga sensor device: Darcy–Forchheimer model
- Performance of carbon nanomaterials incorporated with concrete exposed to high temperature
- Multicriteria-based optimization of roller compacted concrete pavement containing crumb rubber and nano-silica
- Revisiting hydrotalcite synthesis: Efficient combined mechanochemical/coprecipitation synthesis to design advanced tunable basic catalysts
- Exploration of irreversibility process and thermal energy of a tetra hybrid radiative binary nanofluid focusing on solar implementations
- Effect of graphene oxide on the properties of ternary limestone clay cement paste
- Improved mechanical properties of graphene-modified basalt fibre–epoxy composites
- Sodium titanate nanostructured modified by green synthesis of iron oxide for highly efficient photodegradation of dye contaminants
- Green synthesis of Vitis vinifera extract-appended magnesium oxide NPs for biomedical applications
- Differential study on the thermal–physical properties of metal and its oxide nanoparticle-formed nanofluids: Molecular dynamics simulation investigation of argon-based nanofluids
- Heat convection and irreversibility of magneto-micropolar hybrid nanofluids within a porous hexagonal-shaped enclosure having heated obstacle
- Numerical simulation and optimization of biological nanocomposite system for enhanced oil recovery
- Laser ablation and chemical vapor deposition to prepare a nanostructured PPy layer on the Ti surface
- Cilostazol niosomes-loaded transdermal gels: An in vitro and in vivo anti-aggregant and skin permeation activity investigations towards preparing an efficient nanoscale formulation
- Linear and nonlinear optical studies on successfully mixed vanadium oxide and zinc oxide nanoparticles synthesized by sol–gel technique
- Analytical investigation of convective phenomena with nonlinearity characteristics in nanostratified liquid film above an inclined extended sheet
- Optimization method for low-velocity impact identification in nanocomposite using genetic algorithm
- Analyzing the 3D-MHD flow of a sodium alginate-based nanofluid flow containing alumina nanoparticles over a bi-directional extending sheet using variable porous medium and slip conditions
- A comprehensive study of laser irradiated hydrothermally synthesized 2D layered heterostructure V2O5(1−x)MoS2(x) (X = 1–5%) nanocomposites for photocatalytic application
- Computational analysis of water-based silver, copper, and alumina hybrid nanoparticles over a stretchable sheet embedded in a porous medium with thermophoretic particle deposition effects
- A deep dive into AI integration and advanced nanobiosensor technologies for enhanced bacterial infection monitoring
- Effects of normal strain on pyramidal I and II 〈c + a〉 screw dislocation mobility and structure in single-crystal magnesium
- Computational study of cross-flow in entropy-optimized nanofluids
- Significance of nanoparticle aggregation for thermal transport over magnetized sensor surface
- A green and facile synthesis route of nanosize cupric oxide at room temperature
- Effect of annealing time on bending performance and microstructure of C19400 alloy strip
- Chitosan-based Mupirocin and Alkanna tinctoria extract nanoparticles for the management of burn wound: In vitro and in vivo characterization
- Electrospinning of MNZ/PLGA/SF nanofibers for periodontitis
- Photocatalytic degradation of methylene blue by Nd-doped titanium dioxide thin films
- Shell-core-structured electrospinning film with sequential anti-inflammatory and pro-neurogenic effects for peripheral nerve repairment
- Flow and heat transfer insights into a chemically reactive micropolar Williamson ternary hybrid nanofluid with cross-diffusion theory
- One-pot fabrication of open-spherical shapes based on the decoration of copper sulfide/poly-O-amino benzenethiol on copper oxide as a promising photocathode for hydrogen generation from the natural source of Red Sea water
- A penta-hybrid approach for modeling the nanofluid flow in a spatially dependent magnetic field
- Advancing sustainable agriculture: Metal-doped urea–hydroxyapatite hybrid nanofertilizer for agro-industry
- Utilizing Ziziphus spina-christi for eco-friendly synthesis of silver nanoparticles: Antimicrobial activity and promising application in wound healing
- Plant-mediated synthesis, characterization, and evaluation of a copper oxide/silicon dioxide nanocomposite by an antimicrobial study
- Effects of PVA fibers and nano-SiO2 on rheological properties of geopolymer mortar
- Investigating silver and alumina nanoparticles’ impact on fluid behavior over porous stretching surface
- Potential pharmaceutical applications and molecular docking study for green fabricated ZnO nanoparticles mediated Raphanus sativus: In vitro and in vivo study
- Effect of temperature and nanoparticle size on the interfacial layer thickness of TiO2–water nanofluids using molecular dynamics
- Characteristics of induced magnetic field on the time-dependent MHD nanofluid flow through parallel plates
- Flexural and vibration behaviours of novel covered CFRP composite joints with an MWCNT-modified adhesive
- Experimental research on mechanically and thermally activation of nano-kaolin to improve the properties of ultra-high-performance fiber-reinforced concrete
- Analysis of variable fluid properties for three-dimensional flow of ternary hybrid nanofluid on a stretching sheet with MHD effects
- Biodegradability of corn starch films containing nanocellulose fiber and thymol
- Toxicity assessment of copper oxide nanoparticles: In vivo study
- Some measures to enhance the energy output performances of triboelectric nanogenerators
- Reinforcement of graphene nanoplatelets on water uptake and thermomechanical behaviour of epoxy adhesive subjected to water ageing conditions
- Optimization of preparation parameters and testing verification of carbon nanotube suspensions used in concrete
- Max-phase Ti3SiC2 and diverse nanoparticle reinforcements for enhancement of the mechanical, dynamic, and microstructural properties of AA5083 aluminum alloy via FSP
- Advancing drug delivery: Neural network perspectives on nanoparticle-mediated treatments for cancerous tissues
- PEG-PLGA core–shell nanoparticles for the controlled delivery of picoplatin–hydroxypropyl β-cyclodextrin inclusion complex in triple-negative breast cancer: In vitro and in vivo study
- Conduction transportation from graphene to an insulative polymer medium: A novel approach for the conductivity of nanocomposites
- Review Articles
- Developments of terahertz metasurface biosensors: A literature review
- Overview of amorphous carbon memristor device, modeling, and applications for neuromorphic computing
- Advances in the synthesis of gold nanoclusters (AuNCs) of proteins extracted from nature
- A review of ternary polymer nanocomposites containing clay and calcium carbonate and their biomedical applications
- Recent advancements in polyoxometalate-functionalized fiber materials: A review
- Special contribution of atomic force microscopy in cell death research
- A comprehensive review of oral chitosan drug delivery systems: Applications for oral insulin delivery
- Cellular senescence and nanoparticle-based therapies: Current developments and perspectives
- Cyclodextrins-block copolymer drug delivery systems: From design and development to preclinical studies
- Micelle-based nanoparticles with stimuli-responsive properties for drug delivery
- Critical assessment of the thermal stability and degradation of chemically functionalized nanocellulose-based polymer nanocomposites
- Research progress in preparation technology of micro and nano titanium alloy powder
- Nanoformulations for lysozyme-based additives in animal feed: An alternative to fight antibiotic resistance spread
- Incorporation of organic photochromic molecules in mesoporous silica materials: Synthesis and applications
- A review on modeling of graphene and associated nanostructures reinforced concrete
- A review on strengthening mechanisms of carbon quantum dots-reinforced Cu-matrix nanocomposites
- Review on nanocellulose composites and CNFs assembled microfiber toward automotive applications
- Nanomaterial coating for layered lithium rich transition metal oxide cathode for lithium-ion battery
- Application of AgNPs in biomedicine: An overview and current trends
- Nanobiotechnology and microbial influence on cold adaptation in plants
- Hepatotoxicity of nanomaterials: From mechanism to therapeutic strategy
- Applications of micro-nanobubble and its influence on concrete properties: An in-depth review
- A comprehensive systematic literature review of ML in nanotechnology for sustainable development
- Exploiting the nanotechnological approaches for traditional Chinese medicine in childhood rhinitis: A review of future perspectives
- Twisto-photonics in two-dimensional materials: A comprehensive review
- Current advances of anticancer drugs based on solubilization technology
- Recent process of using nanoparticles in the T cell-based immunometabolic therapy
- Future prospects of gold nanoclusters in hydrogen storage systems and sustainable environmental treatment applications
- Preparation, types, and applications of one- and two-dimensional nanochannels and their transport properties for water and ions
- Microstructural, mechanical, and corrosion characteristics of Mg–Gd–x systems: A review of recent advancements
- Functionalized nanostructures and targeted delivery systems with a focus on plant-derived natural agents for COVID-19 therapy: A review and outlook
- Mapping evolution and trends of cell membrane-coated nanoparticles: A bibliometric analysis and scoping review
- Nanoparticles and their application in the diagnosis of hepatocellular carcinoma
- In situ growth of carbon nanotubes on fly ash substrates
- Structural performance of boards through nanoparticle reinforcement: An advance review
- Reinforcing mechanisms review of the graphene oxide on cement composites
- Seed regeneration aided by nanomaterials in a climate change scenario: A comprehensive review
- Surface-engineered quantum dot nanocomposites for neurodegenerative disorder remediation and avenue for neuroimaging
- Graphitic carbon nitride hybrid thin films for energy conversion: A mini-review on defect activation with different materials
- Nanoparticles and the treatment of hepatocellular carcinoma
- Special Issue on Advanced Nanomaterials and Composites for Energy Conversion and Storage - Part II
- Highly safe lithium vanadium oxide anode for fast-charging dendrite-free lithium-ion batteries
- Recent progress in nanomaterials of battery energy storage: A patent landscape analysis, technology updates, and future prospects
- Special Issue on Advanced Nanomaterials for Carbon Capture, Environment and Utilization for Energy Sustainability - Part II
- Calcium-, magnesium-, and yttrium-doped lithium nickel phosphate nanomaterials as high-performance catalysts for electrochemical water oxidation reaction
- Low alkaline vegetation concrete with silica fume and nano-fly ash composites to improve the planting properties and soil ecology
- Mesoporous silica-grafted deep eutectic solvent-based mixed matrix membranes for wastewater treatment: Synthesis and emerging pollutant removal performance
- Electrochemically prepared ultrathin two-dimensional graphitic nanosheets as cathodes for advanced Zn-based energy storage devices
- Enhanced catalytic degradation of amoxicillin by phyto-mediated synthesised ZnO NPs and ZnO-rGO hybrid nanocomposite: Assessment of antioxidant activity, adsorption, and thermodynamic analysis
- Incorporating GO in PI matrix to advance nanocomposite coating: An enhancing strategy to prevent corrosion
- Synthesis, characterization, thermal stability, and application of microporous hyper cross-linked polyphosphazenes with naphthylamine group for CO2 uptake
- Engineering in ceramic albite morphology by the addition of additives: Carbon nanotubes and graphene oxide for energy applications
- Nanoscale synergy: Optimizing energy storage with SnO2 quantum dots on ZnO hexagonal prisms for advanced supercapacitors
- Aging assessment of silicone rubber materials under corona discharge accompanied by humidity and UV radiation
- Tuning structural and electrical properties of Co-precipitated and Cu-incorporated nickel ferrite for energy applications
- Sodium alginate-supported AgSr nanoparticles for catalytic degradation of malachite green and methyl orange in aqueous medium
- An environmentally greener and reusability approach for bioenergy production using Mallotus philippensis (Kamala) seed oil feedstock via phytonanotechnology
- Micro-/nano-alumina trihydrate and -magnesium hydroxide fillers in RTV-SR composites under electrical and environmental stresses
- Mechanism exploration of ion-implanted epoxy on surface trap distribution: An approach to augment the vacuum flashover voltages
- Nanoscale engineering of semiconductor photocatalysts boosting charge separation for solar-driven H2 production: Recent advances and future perspective
- Excellent catalytic performance over reduced graphene-boosted novel nanoparticles for oxidative desulfurization of fuel oil
- Special Issue on Advances in Nanotechnology for Agriculture
- Deciphering the synergistic potential of mycogenic zinc oxide nanoparticles and bio-slurry formulation on phenology and physiology of Vigna radiata
- Nanomaterials: Cross-disciplinary applications in ornamental plants
- Special Issue on Catechol Based Nano and Microstructures
- Polydopamine films: Versatile but interface-dependent coatings
- In vitro anticancer activity of melanin-like nanoparticles for multimodal therapy of glioblastoma
- Poly-3,4-dihydroxybenzylidenhydrazine, a different analogue of polydopamine
- Chirality and self-assembly of structures derived from optically active 1,2-diaminocyclohexane and catecholamines
- Advancing resource sustainability with green photothermal materials: Insights from organic waste-derived and bioderived sources
- Bioinspired neuromelanin-like Pt(iv) polymeric nanoparticles for cancer treatment
- Special Issue on Implementing Nanotechnology for Smart Healthcare System
- Intelligent explainable optical sensing on Internet of nanorobots for disease detection
- Special Issue on Green Mono, Bi and Tri Metallic Nanoparticles for Biological and Environmental Applications
- Tracking success of interaction of green-synthesized Carbopol nanoemulgel (neomycin-decorated Ag/ZnO nanocomposite) with wound-based MDR bacteria
- Green synthesis of copper oxide nanoparticles using genus Inula and evaluation of biological therapeutics and environmental applications
- Biogenic fabrication and multifunctional therapeutic applications of silver nanoparticles synthesized from rose petal extract
- Metal oxides on the frontlines: Antimicrobial activity in plant-derived biometallic nanoparticles
- Controlling pore size during the synthesis of hydroxyapatite nanoparticles using CTAB by the sol–gel hydrothermal method and their biological activities
- Special Issue on State-of-Art Advanced Nanotechnology for Healthcare
- Applications of nanomedicine-integrated phototherapeutic agents in cancer theranostics: A comprehensive review of the current state of research
- Smart bionanomaterials for treatment and diagnosis of inflammatory bowel disease
- Beyond conventional therapy: Synthesis of multifunctional nanoparticles for rheumatoid arthritis therapy