Phase Behavior of 1-Hexadecanesulfonic Acid-Water System. II.:Optical Observations on Larger Aggregates

概要

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Molecular aggregates of 1-hexadecanesulfonic acid were examined by quasi-elastic light scattering, electron microscopy, and phase contrast microscopy. The aggregates were found to be highly polydisperse in size from too small to be seen up to 12 μm under the experimental conditions used. The quasielastic light scattering indicated the hydrodynamic radius of the aggregates to range from ca. 1 to 12 μm at the concentrations from 1.1 to 4.5 mmol dm-3. This parameter did not depend on the concentration but very much on the conditions under which the surfactant solutions were prepared. Rod-like multilamellar vesicles 0.2 μm in width and 1 μm in length were observed by electron microscope for a solution of 2 mmol dm-3. Rod-like aggregates 2 μm in width and 10 μm in length could be seen by phase contrast microscope. Stripe-like textures essentially in the same direction were observed for the gel phase below Tg-s temperature (gel-sol phase transition) by the phase contrast microscope.
Japan Oil Chemists' Societyの論文