Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
 
X-ray Reflectivity Measurements for Freezing Transitions of Alkane Wetting Film on Surfactant Solution Surface
Hiroki MatsubaraTetsumasa TakaichiTakanori TakiueHajime TanidaTomoya UrugaYohko F. YanoMakoto Aratono
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2013 Volume 86 Issue 4 Pages 492-496

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Abstract

X-ray reflectivity measurements were applied to hexadecane wetting film on aqueous solutions of hexadecyltrimethylammonium bromide (CTAB) and tetradecyltrimethylammonium bromide (TTAB). In both cases, the monolayers in which oil molecules are penetrated from hexadecane droplets into surfactant-adsorbed films were found at room temperature. Upon cooling, they showed first-order freezing transitions, however, it was also confirmed that the structures of freezing films were qualitatively different: hexadecane molecules were frozen together with CTAB to form mixed solid monolayer in CTAB–hexadecane while the frozen hexadecane monolayer wetted mixed liquid monolayer in TTAB–hexadecane.

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© 2013 The Chemical Society of Japan
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