首页> 外文会议>Symposium on Structure and Dynamics of Glasses and Glass Formers held December 2-6, 1996,Boston, Massachusetts,U.S.A >Slow dynamics and glass-like behavior of iquid crystals dispersed in nanoporous media
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Slow dynamics and glass-like behavior of iquid crystals dispersed in nanoporous media

机译:纳米多孔介质中分散的液晶的慢动力学和类玻璃行为

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摘要

We have investigated the dynamic behavior of liquid crystals (LC), which are not glass formers when in bulk form, confined in porous matrices with randomly oriented, interconnected pores as well as in parallel cylindrical pores with different pore sizes by photon correlation (time range: 20 ns- 10~3s) and dielectric spectroscopies (frequencies: 0.1 Hz-1.5GHz). We observed that in random pores (pore size is 10 nm and 100 nm) LC does not crystallize at temperatures about 25 deg C below bulk crystallization temperature and the non-Debye relaxational processes studied by both photon correlation and dielectric experiments were found not to be frozen. Slow relaxational process which does not exist in bulk LC and a broad spectrum of relaxation times (10~-8 - 10)s appear not only for LC in random pores behavior of slow mode ( UPSILON > 1ms) was observed. The relaxaton time (determined in photon correlation experiment) of this slow process strongly increases when temperature decreases from 300 K up to 270 K varying from 0.2 ms to 14 s and it's temperature dependence is described by the Vogel-Fulcher law.
机译:我们已经研究了液晶(LC)的动态行为,该液晶不是散装形式的玻璃形成物,而是通过光子相关性(时间范围)限制在具有随机取向,相互连接的孔的多孔基质以及具有不同孔径的平行圆柱孔中:20 ns- 10〜3s)和介电谱(频率:0.1 Hz-1.5GHz)。我们观察到,在随机孔(孔径为10 nm和100 nm)中,LC在低于整体结晶温度约25℃的温度下不会结晶,并且通过光子相关和介电实验研究的非德拜弛豫过程均未发现。冻结的。散装液相色谱中不存在缓慢的弛豫过程,并且不仅观察到液相色谱在缓慢模式下的随机孔行为(UPSILON> 1ms)中还出现宽范围的弛豫时间(10〜-8-10)。当温度从300 K下降到270 K(从0.2 ms到14 s)变化时,这种缓慢过程的弛豫时间(在光子相关实验中确定)急剧增加,并且其温度依赖性由Vogel-Fulcher定律描述。

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