Wetting and Freezing of Hexadecane on an Aqueous Surfactant Solution: Triple Point in a 2-D film
Abstract
Wetting of water by hexadecane has been investigated by ellipsometry as a function of the concentration of the cationic surfactant dodecyltrimethylammonium bromide (DTAB) in the aqueous phase and temperature. Three phases are identified: a 2-D gas of hexadecane molecules and DTAB molecules, a 2-D liquid comprising a mixed monolayer of hexadecane and DTAB, and a 2-D ‘solid’ phase. Evidence is presented to support the hypothesis that the liquid−solid phase transition is actually a wetting transition in which a surface-frozen layer of pure hexadecane wets the liquid-like mixed monolayer of hexadecane and DTAB. The triple point, at which the three phases coexist, is located at a temperature of 17.3 °C and DTAB concentration of 0.75 mmol kg−1. The slopes of the three phase boundaries are analyzed thermodynamically.
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