☆ 4.4 Article

Effect of propylene carbonate on the adsorption and aggregation of surfactants

COLLOID AND POLYMER SCIENCE (2010)

期刊

COLLOID AND POLYMER SCIENCE

卷 288, 期 5, 页码 527-533

出版社

SPRINGER

DOI: 10.1007/s00396-009-2168-z

关键词

Propylene carbonate; TX-100; AOT; Surface tension; Fluorescence; Critical micelle concentration; Aggregation number; Surface excess

类别

Chemistry, Physical Polymer Science

资金

DST, New Delhi
UGC, New Delhi

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Reagent

摘要

Surface tension of TX-100 and AOT was measured at 25 A degrees C in water + propylene carbonate (PC) media containing 5, 10, 15, and 18 wt.% PC. Micellization does not take place in neat PC. Critical micelle concentration (cmc) of TX-100 increases with increase in percentage of PC, while that of AOT passes through a minimum around 5% PC. cmc values of AOT in 15% and 18% PC were obtained from the fluorescence emission spectra of pyrene, but not from surface tension data. Counter ion binding constant of AOT has two values in 5% PC as in water, whereas it has single value in mixed solvents containing 10% or more of PC. With increase in surfactant concentration, variation of aggregation numbers of TX-100 and AOT show opposite trends. The recently reported solvophobicity index works in the present system also.

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