Liquid Crystalline Colloidal System Obtained by Mixing Niobate and Aluminosilicate Nanosheets: A Spectroscopic Study Using a Probe Dye
Liquid Crystalline Colloidal System Obtained by Mixing Niobate and Aluminosilicate Nanosheets: A Spectroscopic Study Using a Probe Dye
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通过混合铌酸盐和铝硅酸盐纳米片获得液晶胶体系统：使用探针染料的光谱研究
作者：
Nobuyoshi Miyamoto† and;T. Nakato
将剥离型层状铌酸钾（K4 Nb 6 O 17）与蒙脱土混合，制备了两种无机氧化物纳米片分散于水中的新型胶体体系。根据在交叉偏振器下对胶体的观察，所获得的层状粘土胶体是具有明显均匀的宏观有序性的液晶，类似于先前报道的剥离层状粘土层的单组分胶体。干燥胶体的X射线衍射测量表明，硅酸盐-粘土胶体被认为是硅酸盐和粘土微相的混合物：胶体在微观上是分层的。使用阳离子花青染料作为探针的光谱研究表明，染料被选择性地吸附在粘土血小板上;结果表明，染料分子的质量转移从纳米片的粘土血小板，转移是伴随着探针染料的聚集状态的改变。微环境提供了B...
A novel colloidal system composed of two kinds of inorganic oxide nanosheets dispersed in water was prepared by mixing exfoliated layered niobate K4Nb6O17 and montmorillonite clay. According to the observation of the colloids under crossed polarizers, the obtained niobate−clay colloids were liquid crystalline with apparently homogeneous macroscopic ordering, similar to the previously reported single-component colloids of the exfoliated niobate layers. X-ray diffraction measurements of the dried colloids indicated that the niobate−clay colloids were regarded as mixtures of the niobate and clay microphases: the colloids are microscopically demixed. Spectroscopic investigations using a cationic cyanine dye as a probe showed that the dye was selectively adsorbed on the clay platelets; the results indicated mass transfer of the dye molecules from the niobate nanosheets to clay platelets, and the transfer was accompanied by alterations of the aggregation state of the probe dye. The microenvironments provided b...