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超小角中性子散乱法によるフラクタル解析

Fractal analysis by ultra-small-angle neutron scattering

山口 大輔; 眞山 博幸*; 小泉 智; 辻井 薫*; 橋本 竹治

Yamaguchi, Daisuke; Mayama, Hiroyuki*; Koizumi, Satoshi; Tsujii, Kaoru*; Hashimoto, Takeji

アルキルケテンダイマーをテンプレートとして作製したポーラスシリカのフラクタル次元を中性子超小角散乱法を用いて解析を行った。作製されたポーラスシリカは広範な長さスケールにわたってフラクタル的なべき乗関数を示し、これまでテンプレート法で作製されてきた孔の径や配列に関して高い秩序性を有するメゾポーラスシリカの系とは異なった構造を示す。本研究では、中性子超小角・小角散乱法を駆使して広範な波数範囲において試料の散乱関数を解析し、その結果から、孔の直径分布やフラクタル次元等の特徴的な構造を同定した。そして、フラクタル構造に関して、過去に行ったナノシート溶液系との関連性など、新たな知見を獲得し、研究の進展が見られたので、学会発表を行う。

The fractal dimensions of specific porous silica materials were investigated by ultra-small-angle neutron scattering (USANS). In order to control the fractal dimension of porous silica material, flaky particles made of alkylletene dimer (AKD) were employed as moulds and silica matrix was formed by sol-gel process. The fractal dimension of the pores was changeable by the compression of the AKD mould at different ratio (hereafter designated as r) before the mould was filled with a TMOS solution, which turned to silica matrix, and three specimens, of which r = 1, 2, and 3, were prepared. USANS measurements brought us wide-q observations of the specimens, in the q scale of more than three orders of magnitude, and made it possible to accurate evaluation of the fractal dimension. The resultant mass-fractal dimensions for the specimens of r = 1, 2, and 3 were 2.98, 2.74, and 2.67, respectively.

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