Interaction and Dynamics of Chemical Species in the Nanospace (Interlayr Space)

五氧化二钒水合物是一种离子层状物质，具有蒙脱石的特性。本项目研究了H_2O分子和NH_3插层的状态条件，以及它们的扩散、电导、化学反应、层间离子迁移率等动力学。结果表明：(1)插层H2O分子的偶极矩沿c轴定向，而在ab平面上不定向。(2)H_2O分子在层间扩散的活化能远小于液体和冰H_2O的扩散激活能，这是由于在吸附初期形成的柱状结构，有利于H_2O分子的扩散.(3)预先插层的氨分子与新插层的H_2O和大量的V_2O_5层片反应生成NH_4VO_3，它的(001)面与水合钒氧化物的(001)面上的ESR谱相吻合.材料水化后由各向异性转变为各向同性。这标志着层间钒离子的存在，这是关于五氧化二钒水合物结构的新命题。

Vanadium pentoxide hydrate is an ionic layred substance and has characteristic properties as does the montmorillonite. In the present project statinary conditions of intercalated H_2O molecules and NH_3, and their dynamics like diffusion, electric conductivity, chemical reactions, interlayr ions's mobility were studied. Results are as follows,(1) The intercalated H_2O molecules are oriented their dipole moment to the c-axis and non- directionally in the ab-plane. However, AC electri cconductivity along b-axis is marked in H_2O along b-axis.(2) Activation energy of diffusion of H_2O molecules between the layrs is much smaller than those for liquid and ice H_2O.This is explained by the formaiton of pillars in the initial stage of adsorption, which eases the diffusion of H_2O molecules.(3) Ammonia molecules previously intercalated react with newly intercalated H_2O and substantial V_2O_5 layr sheets to form NH_4VO_3 topotactically coinciding its (001) plane with that of vanadium oxide hydrate.(4) ESR spectrum of V^<4+> with anisotropic character was changed into that of isotropic one by hydration of the material. This signifies the presence of interlayr vanadium ions, which is the new proposition about the structure of vnadium pentoxide hydrate.