Effect of addition of crown ether on the micellar behavior of Dodecyltrimethylammonium Chloride in Aqueous media

Wissenschaftliche Studie , 2011 , 11 Seiten

Chemie - Makromolekulare Chemie, Polymerchemie

The micellar properties of cationic dodecyltrimethylammonium chloride (DTAC) in aqueous media in the presence of 15-crown-5ether (CR) have been investigated by conductivity measurements over the temperature range 288.15-308.15 K. The results of the ternary DTAC/CR/W system were analysed in comparison with the reported results of binary DTAC/W system. The critical aggregation concentration (cac) and degree of ionization of the micelles were determined from the conductivity measurements at different temperatures. Thermodynamic parameters for the micellar system were estimated by applying the charged pseudo-phase separation model. Micellisation was found to be spontaneous and entropy-driven.

Inhaltsverzeichnis

• Abstract
• Introduction
• Experimental
• Materials
• Methods
• Results and Discussion
• Conclusion
• References

Zielsetzung und Themenschwerpunkte

This research investigates the impact of crown ether (15-crown-5) on the micellar behavior of cationic dodecyltrimethylammonium chloride (DTAC) in aqueous media. The study aims to determine the critical aggregation concentration (cac) and degree of ionization (B) of the micelles in the presence of crown ether, analyze the thermodynamic parameters of micellisation, and understand the effect of temperature on these properties.

• Effect of crown ether on the micellar behavior of DTAC
• Determination of critical aggregation concentration (cac)
• Analysis of the degree of ionization (B) of the micelles
• Thermodynamic parameters of micellisation
• Influence of temperature on micellar properties

Zusammenfassung der Kapitel

The research utilizes conductivity measurements to study the micellar properties of DTAC in aqueous solutions with varying concentrations of crown ether (15-crown-5) over a range of temperatures. The study compares the results of the ternary DTAC/CR/W system with the reported data for the binary DTAC/W system. The critical aggregation concentration (cac) and degree of ionization (B) are determined from the conductivity measurements at different temperatures. The thermodynamic parameters (AG, AHO and AS) for the micellar system are estimated using the charged pseudo-phase separation model.

Schlüsselwörter

Crown ether, Dodecyltrimethylammonium chloride, Critical aggregation concentration, Degree of ionization, Micellar behavior, Thermodynamic parameters, Aqueous media, Conductivity measurements, Charged pseudo-phase separation model.

• Hochschule: Gurukula Kangri Vishwavidayalaya (Department of Chemistry)
• Veranstaltung: Ph.D.
• Autoren: Rajni Garg (Autor:in), R.D. Singh (Autor:in)
• Erscheinungsjahr: 2011
• Seiten: 11
• Katalognummer: V183933
• ISBN (eBook): 9783656089278
• ISBN (Buch): 9783656089438
• Sprache: Englisch
• Schlagworte: Crown ether, Dodecyltrimethylammonium chloride, Critical aggregation concentration, Degree of ionization