Pseudo Phase Transition of Molecular Assembly in a Structure- Controlled Subnanospace Having Enhanced Potential.

结构控制的亚纳米空间中分子组装的伪相变具有增强的潜力。

基本信息

  • 批准号:
    04453004
  • 负责人:
  • 金额:
    $ 4.1万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
  • 财政年份:
    1992
  • 资助国家:
    日本
  • 起止时间:
    1992 至 1993
  • 项目状态:
    已结题

项目摘要

Molecular states of SO_2, NO, N_2, CH_4, and H_2O in carbon subnanospaces of slit shape were studied by heat of adsorption, in situ X-ray diffraction, high pressure adsorption, and ordinary molecular adsorption. Supercritical NO gas was changed into quasi-vapor through formation of (NO)_2 due to strong molecular field of the subnanospace with the aid of magnetic perturbation. Also supercritical CH_4 and N_2 was transformed to their quasi-vapor due to the subnanospace field and application of high pressure of adsorptives. The structural change of H_2O molecular assembly in the subnanospace was examined by high resolution X-ray diffraction anaysis, indicating presence of a distorted two-dimensional ice like structure.New phase transition of molecular assembly in the carbon nanospace was shown in the system of SO_2 and carbon slit pore of 0.8 nm width. The heat of SO_2 adsorption in the carbon subnanospace was divided into the constant region of enhanced potential field below phi=0.6 and an steep increase region above phi=0.6. The constant region was ascribed to enhanced SO_2-slit pore interactions (about 10 KJ/mol) including the induced dipole-permanent dipole interaction ; this indicated the parallel arrangement of dipoles of adsorbed SO_2 molecules. The steep increase was caused by the inter SO_2 molecular interaction which gives rise to conversion of the dipoles, forming the anti-parallel arrangement. The molecular potential calculation using the Lennard-Jones potential, the image potential approximation, and the Stockmayr potential supported this model. This orientation structure of the SO_2 dipoles in the carbon subnanospace depended on the micropore width ; in the greater carbon nanospace the above-mentioned steep transition was not observed. This research showed a new possibility of molecular chemistry controlled by the subnanospace field.
用吸附热、原位X射线衍射、高压吸附和普通分子吸附等方法研究了SO_2、NO、N_2、CH_4和H_2O在狭缝状碳亚纳米空间中的分子状态。超临界NO气体在磁扰动的作用下,在亚纳米空间的强分子场作用下生成(NO)_2,从而转变为准蒸汽。亚纳米空间场和吸附剂高压的作用使超临界CH_4和N_2转化为准蒸气。高分辨X射线衍射分析表明,H_2O分子组装体在亚纳米空间中的结构发生了变化,出现了扭曲的二维冰状结构,SO_2和0.8nm宽的碳狭缝孔体系中的分子组装体出现了新的相变。SO_2在碳亚纳米空间中的吸附热可划分为phi=0.6以下的增强势场恒定区和phi=0.6以上的急剧增加区。在恒定区,SO_2分子与狭缝孔的相互作用增强(约10 KJ/mol),其中包括诱导的偶极-永久偶极相互作用,表明吸附SO_2分子的偶极平行排列。这是由于SO_2分子间的相互作用引起了偶极子的转换,形成了反平行排列。使用Lennard-Jones势、镜像势近似和Stockmayr势计算的分子势支持了该模型。这种取向结构在亚纳米空间中依赖于纳米尺度的宽度,在更大的纳米空间中没有观察到上述陡峭的转变。这项研究为亚纳米空间场控制分子化学提供了新的可能性。

项目成果

期刊论文数量(36)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
K.Kaneko,K.Murata,T.Suzuki: "Enhancement effect of micropore filling for supercritical metharce by MgO dispersion" Langmuir. 9. 1165-1167 (1993)
K.Kaneko、K.Murata、T.Suzuki:“MgO 分散体对超临界甲醇微孔填充的增强作用”Langmuir。
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    0
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J.Fukazawa,K.Kaneko,C.D.Poon,E.T.Samulski: "Molewlar motion in micropore space by D-NMR in“Characterization of Porous Solids III"" J.Rouquerol編集(印刷中), (1994)
J. Fukazawa、K. Kaneko、C. D. Poon、E. T. Samulski:“多孔固体特性 III 中的 D-NMR 微孔空间中的分子运动”,J. Rouquerol 编辑(正在出版),(1994 年)
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    0
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K.Kaneko, R.Cracknell, and D.Nicholson: "Nitrogen adsorption in slit pores at ambient temperatures : Comparison of simulation and experiment." Langmuir. (in press). (1994)
K.Kaneko、R.Cracknell 和 D.Nicholson:“环境温度下狭缝孔隙中的氮吸附:模拟与实验的比较。”
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    0
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T.Suzuki,K.Kaneko: "The micrographite growth of activated carbon fibers with high temperature treatment studied by computer-aided X-ray diffraction" Carbon. 31. 1360-1361 (1993)
T.Suzuki,K.Kaneko:“通过计算机辅助 X 射线衍射研究高温处理活性碳纤维的微石墨生长”碳。
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    0
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K.Kaneko, C.Ishii, T.Arai, and H.Suematsu: "Defect associated microporous nature of C_<60> crystals" J.Phys.Chem.97. 6764-6766 (1993)
K.Kaneko、C.Ishii、T.Arai 和 H.Suematsu:“C_60 晶体的缺陷相关微孔性质”J.Phys.Chem.97。
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KANEKO Katsumi其他文献

KANEKO Katsumi的其他文献

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{{ truncateString('KANEKO Katsumi', 18)}}的其他基金

Chemical activity of edge-atom rich carbon nanospaces of quasi high pressure effect
准高压效应富含边缘原子的碳纳米空间的化学活性
  • 批准号:
    24241038
  • 财政年份:
    2012
  • 资助金额:
    $ 4.1万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Development of Highly Selective Deuteration Reaction Using Quantum Molecular Sieving Effect Enhanced in Nanospace Fields
利用纳米空间场中增强的量子分子筛分效应开发高选择性氘化反应
  • 批准号:
    21241026
  • 财政年份:
    2009
  • 资助金额:
    $ 4.1万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
High density storage of clean energy fuel gases in soft nanospaces
软纳米空间中清洁能源燃气的高密度存储
  • 批准号:
    15101003
  • 财政年份:
    2003
  • 资助金额:
    $ 4.1万
  • 项目类别:
    Grant-in-Aid for Scientific Research (S)
Determination method of angstrom pore size distribution with molecular statistical method
分子统计法测定埃孔径分布的方法
  • 批准号:
    10554039
  • 财政年份:
    1998
  • 资助金额:
    $ 4.1万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
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
  • 批准号:
    06403013
  • 财政年份:
    1994
  • 资助金额:
    $ 4.1万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Angstrom Porosimety with quantum Herium
埃孔隙率与量子氦
  • 批准号:
    05554018
  • 财政年份:
    1993
  • 资助金额:
    $ 4.1万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)

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