fulltext.study @t Gmail

Study on premicellar and micellar aggregates of gemini surfactants with hydroxyl substituted spacers in aqueous solution using a probe showing TICT fluorescence properties

Paper ID Volume ID Publish Year Pages File Format Full-Text
27414 44021 2011 8 PDF Available
Title
Study on premicellar and micellar aggregates of gemini surfactants with hydroxyl substituted spacers in aqueous solution using a probe showing TICT fluorescence properties
Abstract

The aggregation properties of two gemini surfactants, 12-3(OH)-12,2Br− and 12-4(OH)2-12,2Br− with hydroxyl substituted spacer group have been studied. The changes in photophysical properties of a single probe, trans-2-[4-(dimethylamino)styryl]benzothiazole (DMASBT) showing dipolar nature in its twisted intramolecular charge transfer (TICT) excited state have been exploited rather than using multiple probes to describe various properties of micellar aggregates. Formation of a number of premicellar aggregates has been demonstrated in addition to the description of the micropolarity and the microviscosity of environment using steady-state fluorescence spectroscopy and fluorescence anisotropy of DMASBT. Conductometric measurements have been carried out to determine degree of micellar ionization (α) and to verify critical micelle concentration (CMC) values estimated by fluorescence method. Hydroxyl substituted spacer group induces the formation of premicellar aggregates. The micropolarity of environment around probe molecules increases on going from premicellar to micellar aggregates. The growth of micellar aggregates has been demonstrated by a continuous increase in the microviscosity of environment. The micropolarity of micellar environment of 12-4(OH)2-12 is found to be less than that of 12-3(OH)-12. The microviscosity of premicellar and micellar aggregates of 12-4(OH)2-12 are higher than that of 12-3(OH)-12. CMC increases, whereas α decreases with increasing spacer chain length as well as number of hydroxyl substitution of a spacer group.

Graphical abstractThe changes in photophysical properties of a single twisted intramolecular charge transfer fluorescence probe have been exploited rather than using multiple probes to describe various properties of micellar aggregates of gemini surfactants.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► TICT fluorescence properties of a surface probe have been explored to characterize the micelles. ► Premicellar aggregation of gemini surfactants with hydroxyl substituted spacers demonstrated. ► Growth of micelles has been demonstrated by determining the microviscosity. ► The hydroxyl substituted spacer group has significant effect on aggregation behavior.

Keywords
DMASBT; Gemini surfactant; TICT fluorescence; Premicellar aggregation; Micropolarity; Microviscosity
First Page Preview
Study on premicellar and micellar aggregates of gemini surfactants with hydroxyl substituted spacers in aqueous solution using a probe showing TICT fluorescence properties
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 223, Issue 1, 5 September 2011, Pages 6–13
Authors
, , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us