Effect of Additives on the Phase Behavior of SDS/CTAB/H2O Systems
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Hongni Teng
Abstract
The effect of additives on the phase behavior of aqueous solutions of sodium dodecyl sulfate (SDS) and cetyl trimethyl ammonium bromide (CTAB) has been studied in detail for extended applications. The results showed that both the widths of an anionic two-phase aqueous system (ATPSa) region with SDS in excess and a aqueous cationic two-phase system (ATPSc) region with CTAB in excess are very narrow, less than 1% in absence of any additives. However, phase regions of ATPS move toward the corresponding isotropic single phase regions and become wider in the presence of inorganic additives such as NaBr in the aqueous surfactant solutions. This is because the addition of inorganic salt increases the concentration of inorganic counter-ions and therefore the electrostatic interactions between counter-ions and surfactant aggregates. Meanwhile, the organic salts, sodium salicylate and tetrabutylammonium bromide, have been found to have a greater capacity to expand the range of ATPS because the electrostatic interactions between organic ions and aggregates were adjustable through the deformation of the electron cloud of organic ions. Organic additives with different properties can effectively extend the range of either ATPSc or ATPSa. Wherein, sodium salicylate can expand ATPSc efficiently and tetrabutylammonium bromide can expand ATPSa significantly.
Kurzfassung
Die Wirkung von Additiven auf das Phasenverhalten von wässrigen Lösungen aus Natriumdodecylsulfat (SDS) und Cetyltrimethylammoniumbromid (CTAB) wurde im Detail für erweiterte Anwendungen untersucht. Die Ergebnisse zeigten, dass sowohl die wässrige anionische Zweiphasenregion (ATPSa) mit SDS im Überschuss als auch die wässrige kationische Zweiphasenregion (ATPSc) mit überschüssigem CTAB (weniger als 1% in Abwesenheit irgendwelcher Additive) sehr eng sind. Die Phasenbereiche von ATPS bewegen sich jedoch auf die entsprechenden isotropen Einzelphasenregionen zu und werden in Gegenwart von anorganischen Additiven wie NaBr in den wässrigen Tensidlösungen breiter. Dies liegt daran, dass die Zugabe von anorganischem Salz die Konzentration von anorganischen Gegenionen und daher die elektrostatischen Wechselwirkungen zwischen Gegenionen und Tensidaggregaten erhöht. Mittlerweile wurde gefunden, dass die organischen Salze, Natriumsalicylat und Tetrabutylammoniumbromid, eine größere Kapazität haben, den Bereich von ATPS zu erweitern, da die elektrostatischen Wechselwirkungen zwischen organischen Ionen und Aggregaten durch die Verformung der Elektronenwolke von organischen Ionen einstellbar waren. Organische Additive mit unterschiedlichen Eigenschaften können den Bereich entweder von ATPSc oder von ATPSa effektiv erweitern. Dabei kann Natriumsalicylat ATPSc effizient und Tetrabutylammoniumbromid ATPSa signifikant expandieren.
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© 2018, Carl Hanser Publisher, Munich
Articles in the same Issue
- Contents/Inhalt
- Contents
- Editorial
- Review of the Year 2017
- Physical Chemistry
- On the Influence of Intersurfactant H-Bonds on Foam Stability: A Study with Technical Grade Surfactants
- Phase Boundaries, Optical Refraction and Specific Electrical Conductivity Properties in Lyotropic Micellar L1 Phase: Bicomponent Amphiphilic (DDTMABr + HDTMABr) + Water System
- Effect of Additives on the Phase Behavior of SDS/CTAB/H2O Systems
- Influence of Micellar Media on Extraction of Copper(II) from Sulphate and Chloride Solutions using an N,N′-Bis(salicylideneaminoethyl)amine Multidentate Schiff Base
- Environmental Chemistry
- Biodegradation of Oxyethylated Fatty Alcohols by Bacterium Pseudomonas alcaligenes; AE Biodegradation by Pseudomonas alcaligenes
- Influence of Organic Loading Rates (OLR) in Treatment of Pulp and Paper Mill Wastewater with Hybrid Upflow Anaerobic Sludge Blanket Reactor (HUASBR) with Hexagonal Polypropylene Inert Material
- Application
- Linear-Dendritic Block Copolymer Containing Fluorescent Groups: An Effective and Environmentally Benign Inhibitor for Calcium Carbonate
- Performance Evaluation and Application of the Surfactant Combinations showing Ultra-low Oil-Water Interfacial Tensions
- Synthesis
- Organosilicone Modified Styrene-Acrylic Latex: Preparation and Crude Oil Dehydration
- Synthesis and Characterization of Dicationic Gemini Surfactant Micelles and their Effect on the Rate of Ninhydrin–Copper-Peptide Complex Reaction
Articles in the same Issue
- Contents/Inhalt
- Contents
- Editorial
- Review of the Year 2017
- Physical Chemistry
- On the Influence of Intersurfactant H-Bonds on Foam Stability: A Study with Technical Grade Surfactants
- Phase Boundaries, Optical Refraction and Specific Electrical Conductivity Properties in Lyotropic Micellar L1 Phase: Bicomponent Amphiphilic (DDTMABr + HDTMABr) + Water System
- Effect of Additives on the Phase Behavior of SDS/CTAB/H2O Systems
- Influence of Micellar Media on Extraction of Copper(II) from Sulphate and Chloride Solutions using an N,N′-Bis(salicylideneaminoethyl)amine Multidentate Schiff Base
- Environmental Chemistry
- Biodegradation of Oxyethylated Fatty Alcohols by Bacterium Pseudomonas alcaligenes; AE Biodegradation by Pseudomonas alcaligenes
- Influence of Organic Loading Rates (OLR) in Treatment of Pulp and Paper Mill Wastewater with Hybrid Upflow Anaerobic Sludge Blanket Reactor (HUASBR) with Hexagonal Polypropylene Inert Material
- Application
- Linear-Dendritic Block Copolymer Containing Fluorescent Groups: An Effective and Environmentally Benign Inhibitor for Calcium Carbonate
- Performance Evaluation and Application of the Surfactant Combinations showing Ultra-low Oil-Water Interfacial Tensions
- Synthesis
- Organosilicone Modified Styrene-Acrylic Latex: Preparation and Crude Oil Dehydration
- Synthesis and Characterization of Dicationic Gemini Surfactant Micelles and their Effect on the Rate of Ninhydrin–Copper-Peptide Complex Reaction
