Dynamics of nematic liquid crystal with quenched disorder in the random dilution and random field regimes.
Dynamics of nematic liquid crystal with quenched disorder in the random dilution and random field regimes.
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随机稀释和随机场状态下具有淬灭无序的向列液晶动力学。
DOI：
10.1103/physrevlett.95.237801
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发表时间：
2005
影响因子：
8.6
通讯作者：
U. Zammit
中科院分区：
文献类型：
--
作者：
M. Marinelli;F. Mercuri;S. Paoloni;U. Zammit
通过比热谱，我们已经研究了的动力学的成核，在随机无序的存在下，随着温度降低，在各向同性的相变，使交叉区域的随机稀释的无序强度的随机场制度进行了探索。我们表明，在频率依赖性，滞后行为，和老化效应方面，在随机无序制度中的nucleated的非平衡特性强烈地让人想起散装材料，而在随机场制度中生长的一个显示出玻璃态的行为与老化导致较慢的动态。的老化效应已被解释在应变弛豫与其他软玻璃胶体系统中的观察类比。
By means of specific heat spectroscopy, we have studied the dynamics of nematic 8CB nucleated, in the presence of random disorder, as the temperature is lowered across the isotropic to nematic phase transition such that the crossover region of random dilution to random field regimes of disorder strength is explored. We show, in terms of frequency dependence, hysteretic behavior, and aging effects, that the out-of-equilibrium properties of the nematic nucleated in the random disorder regime are strongly reminiscent of the bulk material while the one grown in the random field regime shows a glassy behavior with aging leading to slower dynamics. The aging effect has been explained in terms of strain relaxation in analogy with observations in other soft glassy colloidal systems.