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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Fluid-wall interactions effects on the dynamical properties of confined orthoterphenyl
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Fluid-wall interactions effects on the dynamical properties of confined orthoterphenyl

机译：流体-壁相互作用对受限的邻三苯基动力学性质的影响

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摘要

We have investigated the dynamics of fragile glass forming orthoterphenyl confined in nanoporous materials with different surface properties. The dynamics on the nanosecond timescale were probed with neutron spin echo measurements. The intermediate scattering functions were fitted using a stretched exponential and a background. This background, due to molecules forming an interfacial layer at the surface of the pore that are immobile at the nanosecond time scale, depends on the surface properties of the porous materials and increases with decreasing temperature. The dynamics of the confined liquid depends on fluid-wall interactions: the dynamics are slower in a weakly attractive silica-walled material with 7.1 nm pores (similar to 9 molecular diameters) than in a hydrophobic material with 6.3 nm pores (similar to 8 molecular diameters). Adsorption times of 1 mu s and 690 ns at 298 and 323 K for oTP confined in silica-walled nanoporous materials were calculated from nuclear magnetic resonance field cycling relaxometry experiments. (c) 2006 Elsevier B.V. All rights reserved.
机译：我们研究了受限于具有不同表面性质的纳米多孔材料中的易碎玻璃形成邻三苯基的动力学。用中子自旋回波测量来探测纳秒级的动力学。使用拉伸指数和背景拟合中间散射函数。由于在纳秒级时不动的孔表面上形成界面层的分子，该背景取决于多孔材料的表面性质，并且随着温度的降低而增加。密闭液体的动力学取决于流体-壁之间的相互作用：具有7.1 nm孔（近似于9个分子直径）的，具有弱吸引力的二氧化硅壁材料的动力学要比具有6.3 nm孔（近似于8个分子）的疏水性材料的动力学慢。直径）。通过核磁共振场循环弛豫法实验计算出，在298和323 K下，局限在二氧化硅壁纳米多孔材料中的oTP的吸附时间分别为1μs和690 ns。 （c）2006 Elsevier B.V.保留所有权利。

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