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The characteristics of the thin films of silica-alkyltrimethylammonium chloride mesostructured materials have been investigated by means of the fluorescence of pyrene as well as the infrared spectra at variable temperatures. Pyrene molecules were incorporated in the hydrophobic part of the silica-surfactant mesostructured materials without aggregation even at a high loading amount. The temperature dependence of the luminescence of pyrene revealed that the microviscosity of the probe microenvironments decreased gradually with decreasing temperature. The infrared absorption bands of the mesostructured materials confirmed the thermotropic change in the state of the surfactant aggregates.

Our results reveal the importance of higher order statistics for the development of nonintrusive skin quality assessments of the skin.

Novel silica-alkyltrimethylammonium (with the alkyl groups of decyl, dodecyl, tetradecyl, hexadecyl, and octadecyl) bromide nanocomposite films were synthesized by coating the precursor solutions containing prehydrolyzed tetramethoxysilane and alkyltrimethylammonium bromide. The composites are thought to be composed of aggregates of alkyltrimethylammonium bromides and thin silica layers. The d values of the products varied depending on the relative ratios of tetramethoxysilane and surfactants, suggesting that the microstructures of the products can be controlled by simply changing the compositions. Since the present composites are obtained as transparent films, they have potential applicability as a new class of functional materials, especially for photofunctional purposes.