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arXiv 1406.6478cond-mat.soft
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无规钉扎胶态玻璃化转变的生长动力学促进

Growing Dynamical Facilitation on Approaching the Random Pinning Colloidal Glass Transition

Shreyas Gokhale, K. Hima Nagamanasa, Rajesh Ganapathy, A. K. Sood

摘要:

尽管经过了几十年的研究,液体转变成玻璃的过程从根本上说是热力学的还是动力学的仍有待确定。虽然观察到的增长长度尺度与随机一级跃迁理论(RFOT)等热力学观点一致,但动力促进(DF)理论的纯动力学方法缺乏实验验证。此外,对于由随机冷冻液相中的粒子子集引起的玻璃化转变,模拟支持RFOT的预测,而DF理论仍然未被探索。在这里,使用视频显微镜和全息光镊,我们表明,在一个胶体玻璃形成液体中的动力学促进明确增长的密度,以及钉扎粒子的分数。此外,我们表明,异质动力学的形式弦样的合作运动,这被认为是一致的RFOT,自然出现的框架内的促进。最重要的是,我们的研究结果表明,不能排除玻璃化转变的纯动态起源。

英文摘要:

Despite decades of research, it remains to be established whether the transformation of a liquid into a glass is fundamentally thermodynamic or dynamic in origin. While observations of growing length scales are consistent with thermodynamic perspectives like the Random First-Order Transition theory (RFOT), the purely dynamic approach of the Dynamical Facilitation (DF) theory lacks experimental validation. Further, for glass transitions induced by randomly freezing a subset of particles in the liquid phase, simulations support the predictions of RFOT, whereas the DF theory remains unexplored. Here, using video microscopy and holographic optical tweezers, we show that dynamical facilitation in a colloidal glass-forming liquid unambiguously grows with density as well as the fraction of pinned particles. In addition, we show that heterogeneous dynamics in the form of string-like cooperative motion, which is believed to be consistent with RFOT, emerges naturally within the framework of facilitation. Most importantly, our findings demonstrate that a purely dynamic origin of the glass transition cannot be ruled out.

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