Glass-forming liquids in mesopores probed by solvation dynamic and dielectric techniques
Glass-forming liquids in mesopores probed by solvation dynamic and dielectric techniques
复制标题
通过溶剂化动力学和介电技术探测介孔中的玻璃形成液体
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
R. Richert
中科院分区：
文献类型：
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作者：
X. Yan;C. Streck;R. Richert
有机过冷液体的取向动力学的低分子量的多孔玻璃的几何形状的研究，由两个高度相关的技术，光学方法探测的溶剂化动力学关于发色团的主机分子和介电弛豫光谱。介电的结果显示显着的效果的限制到中孔的改变的结构动力学方面，出现分离成光栅和较慢的响应相对于散装液体。我们还证明了在这些非均质样品中，e *（ω）数据和液体动力学之间没有微不足道的关系。这些效应部分地被溶剂化动力学结果所掩盖，但与光学技术中固有的空间范围不一致，将快速和慢速动力学分量与空间上不同的制度相关联。我们得出结论的缓慢的组成部分是一个签名的非遍历性所产生的长度尺度的协同性和孔径之间的竞争。
The orientational dynamics of organic supercooled liquids of low molecular weight confined to the geometry of porous glasses are studied by two highly related techniques, the optical method of probing the dynamics of solvation regarding a chromophoric host molecule and dielectric relaxation spectroscopy. The dielectric results display marked effects of the confinement to mesopores in terms of altered structural dynamics which appear to separate into a raster and slower responses relative to the bulk liquid. We also demonstrate that there is no trivial relation between the e * (ω) data and the liquid dynamics in these heterogeneous samples. These effects are partially paralleled by the solvation dynamics results, but with the spatial range inherent in the optical technique being inconsistent with associating the fast and slow dynamical components to spatially distinct regimes. We conclude on the slow component being a signature of non-ergodicity which arises from the competition between the length scale of cooperativity and the pore size.