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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Diffusive Relaxations and Vibrational Properties of Water and H-bonded Systems in Confined State by Neutrons and Light Scattering: State of the Art
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Diffusive Relaxations and Vibrational Properties of Water and H-bonded Systems in Confined State by Neutrons and Light Scattering: State of the Art

机译：中子和光散射在受限状态下水和氢键系统的扩散弛豫和振动特性：最新技术

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摘要

A detailed spectroscopic analysis is presented in order to study the reorientational and vibrational dynamics of water an other fundamental H-bonded systems: ethylene glycol (HO-CH_2-CH_2-OH) and its homologous species, such as ethylene glycol monomethyl ether (CH_3O-CH_2-CH_2-OH) and ethylene glycol dimethyl ether (CH_3O-CH_2-CH_2-OCH_3), propylene glycol (HO-CH(CH_3)-CH_2-OH) and its oligomers, that are confined in a matrix of sol-gel porous glasses with 26 A interconnected cylindrical pores. The use of different spectroscopic techniques, light scattering (Rayleigh wing and Raman scattering), FT-IR absorption, neutron scattering (incoherent quasi elastic and inelastic neutron scattering, IQENS and IINS, respectively) allow the marking of different dynamical parameters, with different probes being used to investigate H-bonded systems. The clear influence of the confinement on the mobility of the studied liquids, with a dramatic frozen-in observed effect respect to the bulk state, is evidenced and compared with literature results. Furthermore, a surface-liquid potential well induces strong modifications of the local symmetry of the vibrational groups (e.g., the active OH stretching groups) involved in the interaction, giving rise to anharmonic effects (red shift, band enlargement) that depend on the nature of the surface (hydrophobic or hydrophilic) and on the nature of guest liquids (wetting or nonwetting).
机译：进行了详细的光谱分析，以研究水和其他基本氢键系统的重配和振动动力学：乙二醇（HO-CH_2-CH_2-OH）及其同源物，例如乙二醇单甲醚（CH_3O- CH_2-CH_2-OH）和乙二醇二甲醚（CH_3O-CH_2-CH_2-OCH_3），丙二醇（HO-CH（CH_3）-CH_2-OH）及其低聚物被限制在溶胶-凝胶多孔基质中具有26 A相互连通的圆柱孔的玻璃。通过使用不同的光谱技术，光散射（瑞利翼和拉曼散射），傅立叶变换红外吸收，中子散射（非相干准弹性和非弹性中子散射，分别为IQENS和IINS），可以使用不同的探针标记不同的动力学参数。用于研究H键合系统。证实了该限制对所研究液体的流动性的明显影响，并且相对于整体状态具有显着的冻结效应，并与文献结果进行了比较。此外，表面液势阱诱导相互作用中涉及的振动基团（例如，活性OH拉伸基团）的局部对称性发生强烈改变，从而产生取决于性质的非谐效应（红移，谱带扩大）表面（疏水或亲水）的性质以及客体液体的性质（润湿或不润湿）。

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