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arXiv 0812.2947cond-mat.softcond-mat.dis-nn
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老化和再生眼镜中的时空结构

Spatiotemporal structures in aging and rejuvenating glasses

Peter G. Wolynes

摘要:

复杂的时空结构在玻璃冷却后老化和玻璃加热后再生的过程中发展。理解这些结构的关键是激活的重新配置事件之间的相互作用,产生的流动性和流动性的运输。这两种效应都是由激活事件的随机一阶跃迁理论与非均匀环境中的模式耦合理论相结合来解释的。预测的修改流动性运输的时间过程中的老化制度是温和的。相比之下,通过传播源自初始重新配置事件的增强移动性的前沿,再生过程受到强烈影响。再生玻璃中的结构类似于火焰。沿着燃烧理论的分析提供了对前缘传播速度的估计。对于具有自由表面的玻璃,自然会发生不均匀的再生。与燃烧的类比也提供了一种新的方式来看待由情况II和超级情况II扩散描述的玻璃吸收稀释剂。

英文摘要:

Complex spatiotemporal structures develop during the process of aging glasses after cooling and of rejuvenating glasses upon heating. The key to understanding these structures is the interplay between the activated reconfiguration events which generate mobility and the transport of mobility. These effects are both accounted for by combining the random first order transition theory of activated events with mode coupling theory in an inhomogeneous setting. The predicted modifications by mobility transport of the time course of the aging regime are modest. In contrast, the rejuvenation process is strongly affected through the propagation of fronts of enhanced mobility originating from the initial reconfiguration events. The structures in a rejuvenating glass resemble flames. An analysis along the lines of combustion theory provides an estimate of the front propagation speed. Heterogeneous rejuvenation naturally should occur for glasses with free surfaces. The analogy with combustion also provides a new way of looking at the uptake of diluents by glasses described by case II and super case II diffusion.

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