Abstract
The structure of behenic acid and ω-tricosenoic acid Langmuir-Blodgett multilayers was studied by measuring their IR dichroism. The in-plane anisotropy and the multilayer structure (very close to the C form of stearic acid) was determined from normal incidence dichroism. Furthermore, three-dimensional crystallization was shown to be present only in behenic acid multilayers. The aliphatic chain tilt angle (23° for behenic acid and 18° for ω-tricosenoic acid) was measured by IR dichroism performed at a variable angle of incidence using transverse magnetic polarization. The preferential tilting direction (along the withdrawal direction) was also determined.
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