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Arrangements of interlayer quaternary ammonium ions in a layered silicate, octosilicate

机译:层状硅酸盐,辛硅酸盐中层间季铵离子的排列

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摘要

The ion exchange of octosilicate with a series of quaternary organoammonium ions was examined. The ion exchange proceeds almost quantitatively to replace the interlayer sodium ions. When n-alkyltrimethylammonium ions were exchanged with sodium ions, the basal spacings increased with the alkyl chain length, showing the formation of paraffin type surfactant aggregates in the interlayer space. When the organic cations with complex molecular geometry (dimethyldioctadecylammonium, N-(α-trimethylammonioacetyl)-didodecyl-l- glutamate, and O,O',O"-tridodecanoyl-N-(ω-trimethyl ammoniodecanoyl)-tris(hydroxymethyl)aminomethane) were used, the basal spacings changed as a function of the molecular weight of the intercalated guest species. It is speculated that the molecular geometries of the intercalated species are flexible to form densely packed nanostructures in the interlayer space.
机译:研究了八硅酸盐与一系列季有机铵离子的离子交换。离子交换几乎定量地进行,以取代层间钠离子。当正烷基三甲基铵离子与钠离子交换时,基础间距随烷基链长的增加而增加,表明在层间空间中形成了石蜡型表面活性剂聚集体。当具有复杂分子几何结构的有机阳离子时(二甲基二十八烷基lam,N-(α-三甲基氨乙酰基)-二癸基-1-谷氨酸和O,O',O“-十三十二烷基-N-(ω-三甲基氨十二烷酰基)-三(羟甲基)氨基甲烷),基间距随着插入的客体物种的分子量变化而变化,推测插入的物种的分子几何形状是柔性的,以在层间空间中形成密集堆积的纳米结构。

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