ラングミュアーブロジェット法を応用したメチレンブルー : 粘土ハイブリッド薄膜の調製と薄膜中におけるメチレンブルーの分子配向

概要

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Hybrid thin films of montmorillonite, octadecylammonium cation, and methylene blue (MB^+) were prepared by a combined method of the Langmuir-Blodgett and self-assembly techniques. Electronic spectra of the hybrid films gave absorption peaks at 600 and 656 nm, which were assigned to the dimeric MB^+ and the monomeric MB^+ in the film, respectively. The absorbance at 600 nm increased linearly with the increase in the layer number, indicating that the hybrid monolayers were fabricated in a layer-by-layer way. The slope of the line wa dependent on the clay concentration in the suspension used for the film preparation. This meant that the density of the cationic dye in the film could be controlled by changing the clay concentration. The XRD patterns for the hybrid multilayers were independent of the clay concentration. From the XRD data, a thickness of the MB^+ layer in the film wa calculated to be 1.05 nm. In order to determine the molecular orientation of MB^+ in the hybrid film, electronic spectra with s- and p-polarized lights for the films were recorded. As a result, the long axis of the molecule was inclined at 21°with respect to the film surafce. Taking the thickness of the MB^+ layer (1.05nm) into consideration, a model of the molecular orientation in the film was proposed.
日本粘土学会の論文
2003-05-26