Molecular Assemblies Confined in a Controlled Angstrom-Range Solid Space

限制在受控埃范围固体空间中的分子组装体

基本信息

批准号：
06403013
负责人：
KANEKO Katsumi
金额：
$ 18.11万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

We dispersed four kinds of graphitic angstrom-range spaces : the graphitic slit micropores of heat-treated activated carbon fibers (ACFs), graphitic films of oriented slit-micropores, point defect-induced pore spaces in C60 crystals, and micropore-donated carbon aerogels. Their atomic and pore structures were determined by X-ray diffraction and molecular probe method, respectively. The nano-oriented structure of the pore oriented graphitic film was characterized by atomic force microscopy (AFM). AFM showed that slit-pores have a considerably good mutual orientation. The fine micropore structures were determined by N_2 adsorption at 77 K and He adsorption at 4.2 K In particular, He adsorption was effective for elucidation of ultramicropore structures. The structure of H_2O and CCl_4 confined in a slit-micropore of ACFs having different widths from 0.7 nm to 1.3 nm were determined by in situ X-ray diffraction at the temperature range of -150 to 30ﾟC.The electron radial distribution function of H_2O confined in the micropore at 30ﾟC was completely different from that of bulk liquid water 30ﾟC.The structure of H_2O molecules in micropores did not change even at -150ﾟC.On the other hand, CCl_4 molecules confined in micropores of pore widths except for 1.0 nm had a liquid like structure, but ones in 1.0 nm-width pores had a plastic cystalline structure. The Grand Canonical Monte Calro simulation anticipated this structural anomaly for CCl_4 molecules in micropores of the 1.0 nm width. The activated carbon aerogels had bimodal distribution of uniform mesopores and micropores, of which pore widths can be controlled by the preparation conditions. The pore geometry could be approximated by a cylinder form. The molecular defets in C_<60> crystals could be controlled by the recrystallization and it was shown that a plenty of molecular defects form the connected micropores.

我们分散了四种图形备用范围：热处理活化碳纤维的图形缝隙微孔（ACFS），定向缝隙 - 微孔的图形膜，点缺陷诱导的孔中的孔隙空间，C60晶体中的孔隙空间以及微孔晶体晶体的碳机构和微孔的碳机构。它们的原子和孔结构分别通过X射线衍射和分子探针方法确定。以原子力显微镜（AFM）为特征，面向孔的图形膜的纳米导向结构。 AFM表明缝隙置于仔细的相互取向。通过N_2在77 K处的N_2吸附确定细小的微孔结构，尤其是在4.2 K处吸附，他的吸附有效地阐明了超级玻璃体结构。 The structure of H_2O and CCl_4 confined in a slit-micropore of ACFs having different widths from 0.7 nm to 1.3 nm were determined by in situ X-ray diffraction at the temperature range of -150 to 30ﾟC.The electron radial distribution function of H_2O confined in the micropore at 30ﾟC was completely different from that of bulk liquid water 30ﾟC.The structure of H_2O molecules in微孔即使在-150 ﾟ处也没有变化。另一方面，除1.0 nm的孔宽度外，CCL_4分子被限制在孔宽度的微孔中，但具有液体类似结构，但是1.0 nm宽的毛孔中的孔具有塑料胱氨酸结构。大规范的蒙特卡罗模拟预期了1.0 nm宽度的Micropores中CCL_4分子的这种结构异常。活化的碳气凝岩具有均匀的中孔和微孔的双峰分布，其中孔隙宽度可以通过制备条件来控制。孔几何形状可以通过圆柱形式近似。 C_ <60>晶体中的分子缺陷可以通过重结晶来控制，并表明许多分子缺陷构成了连接的微孔。