Abstract

We investigated the aggregation structure of fatty acid monolayers (C12-C22) at the air-water interface with reflectance measurements. Reflection spectra from the water surface and surface pressure-area isotherm was measured during compression. Though fatty acids are transparent in the visible region, an increase in reflectance which increases with decreasing wave length due to the formation of aggregates (domains) was observed even below the surface pressure of O.lmN/m. The size of aggregates in gaseous state monolayers increases with the length of alkylchain up to arachidic acid (C~O), but it decreases remarkably in behenic acid (C22).

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