The Role of Rhamnolipids in Coffee Ring Deposition and Influence of Metal Ions
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Zulfiqar Ali Raza
Abstract
The deposition of material at the edge of an evaporating droplet is known as the coffee ring effect. This phenomenon is widespread in various colloidal and bacterial systems. The study has examined the self-assembly and deposition of colloidal rhamnolipid (a natural surfactant) structures on a glass surface. The effects of the rhamnolipid concentration, pH and the addition of cations on the deposition formation and the alteration in coffee ring effect were studied by using in-vitro scanning electron microscope observation. Above the critical micelle concentration, a transition from ring-like deposition to dispersed deposition is observed. Whereas upon the addition of cations, the multi-distribution of aggregates size enhances the non-homogeneity of the drying film and consequently results in multi-nucleation of rhamnolipid aggregates.
Kurzfassung
Die Materialablagerung an dem Rand eines verdampfenden Tropfens kennt man als „Kaffee-Ring“-Effekt. Dieses Phänomen ist in vielen kolloidalen und bakteriellen System weit verbreitet. In dieser Untersuchung wurden die Selbstorganisation und die Abscheidung von kolloidalen Rhamnolipidstrukturen (einem natürlichem Tensid) auf einer Glasoberfläche untersucht. Der Einfluss der Rhamnolipidkonzentration, des pH-Werts und die Zugabe von Kationen auf die Entstehung der Ablagerung und die Veränderung des “Kaffee-Ring”-Effekts wurden mittels der in-vitro-Rasterelektronenmikroskopie untersucht. Oberhalb der kritischen Mizellenbildungskonzentration wurde ein Übergang von der ringförmigen zur feinverteilten Ablagerung beobachtet. Während der Zugabe von Kationen verbesserte die Multi-Verteilung der Aggregatgröße die Nicht-Homogenität des getrockneten Films und daraus resultierte eine Mehrfachkeimbildung der Rhamnolipidaggregate.
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© 2015, Carl Hanser Publisher, Munich
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Physical Chemistry
- Linear Polyethers as Additives for AOT-Based Microemulsions: Prediction of Percolation Temperature Changes Using Artificial Neural Networks
- Adsorption and Micellization Behavior of Mixtures of Amphiphilic Drugs with Small Amounts of Bile Salts
- Determination of Shape Transition Concentrations in Self-Assembled Surfactant Micelles by UV-Visible Spectrophotometry
- Synthesis and Colloidal-Chemical Properties of Surfactants Based on Alkyl Amines and Propylene Oxide
- A Study of Relationship Between Oil-Water Interfacial Dilational Rheology and Oil Recovery of Alkaline Flooding
- Mizellar Catalysis
- Best Combination of Promoter and Micellar Catalyst for Room Temperature Rapid Conversion of D-Lyxose to D-Lyxonic Acid in Aqueous Medium
- Novel Surfactants
- Surface and Fluorescence Studies of Bis-Sulfosuccinate Anionic Gemini Surfactants Derived from Dodecanol Using Different Flexible Methylene Chains as Spacers
- The Role of Rhamnolipids in Coffee Ring Deposition and Influence of Metal Ions
- Synthesis
- Random Copolymer as Polymeric Surfactant in Seed Emulsion Polymerization
- Body Care
- Study of Tea Saponin Toothpaste
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Physical Chemistry
- Linear Polyethers as Additives for AOT-Based Microemulsions: Prediction of Percolation Temperature Changes Using Artificial Neural Networks
- Adsorption and Micellization Behavior of Mixtures of Amphiphilic Drugs with Small Amounts of Bile Salts
- Determination of Shape Transition Concentrations in Self-Assembled Surfactant Micelles by UV-Visible Spectrophotometry
- Synthesis and Colloidal-Chemical Properties of Surfactants Based on Alkyl Amines and Propylene Oxide
- A Study of Relationship Between Oil-Water Interfacial Dilational Rheology and Oil Recovery of Alkaline Flooding
- Mizellar Catalysis
- Best Combination of Promoter and Micellar Catalyst for Room Temperature Rapid Conversion of D-Lyxose to D-Lyxonic Acid in Aqueous Medium
- Novel Surfactants
- Surface and Fluorescence Studies of Bis-Sulfosuccinate Anionic Gemini Surfactants Derived from Dodecanol Using Different Flexible Methylene Chains as Spacers
- The Role of Rhamnolipids in Coffee Ring Deposition and Influence of Metal Ions
- Synthesis
- Random Copolymer as Polymeric Surfactant in Seed Emulsion Polymerization
- Body Care
- Study of Tea Saponin Toothpaste
