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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 >Influence of confinement on molecular and director reorientational dynamics of liquid crystal
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Influence of confinement on molecular and director reorientational dynamics of liquid crystal

机译：约束对液晶分子和指向矢取向动力学的影响

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摘要

We present the qualitative results of investigations of influence of confinement of liquid crystal in random porous medium on relaxation due to molecular reorientations investigated by dielectric spectroscopy and fluctuations of director orientations (collective relaxation) investigated by photon correlation spectroscopy. The relaxation times of the process due to the molecular rotations in deeply supercooled state of confined liquid crystal were slower than at the temperatures corresponding to nematic phase by a factor of 10(6). This slowing down was accompanied by anomalous broadening of the dielectric spectra. We attribute this qualitative change in molecular relaxation to coupling of molecules to the pore walls and among themselves via molecule-wall interactions. In the nematic phase of bulk liquid crystals, the relaxation process due to director orientation fluctuations (collective mode) was single exponential. The dynamics of this process was also drastically modified by random confinement. The slow relaxation process, which does not exist in the bulk liquid crystal, and a broad spectrum of relaxation times, appear for confined liquid crystal. These results on the influence of confinement on relaxation properties of liquid crystal were complimented by differential scanning calorimetry experiments.
机译：我们介绍了定性研究结果的定性研究结果，这些研究结果是由于介电光谱法研究的分子重新取向和光子相关光谱法研究的指向矢取向（集体弛豫）的波动而对随机多孔介质中液晶的限制对弛豫的影响的研究。在密闭液晶的深度过冷状态下，由于分子旋转引起的过程弛豫时间比在向列相对应的温度下慢了10（6）倍。这种减慢伴随着介电谱的异常加宽。我们将分子弛豫的这种定性变化归因于分子与孔壁的耦合以及它们之间通过分子-壁相互作用的耦合。在块状液晶的向列相中，由于指向矢取向波动（集体模式）引起的弛豫过程是单指数的。此过程的动力学也通过随机限制进行了彻底修改。对于受限液晶，出现了缓慢的弛豫过程，这在块状液晶中不存在，并且弛豫时间范围广。差示扫描量热法实验证明了这些限制条件对液晶弛豫性能的影响。

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