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首页> 外文会议>Conference on Noise as a Tool for Studying Materials Jun 2-4, 2003 Santa Fe, New Mexico, USA >Nanoscale Dynamics in Glass
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Nanoscale Dynamics in Glass

机译：玻璃中的纳米动力学

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A number of recent experiments and simulations strongly support the idea that dynamics are spatially heterogeneous in glassy materials. Relaxation times appear to be correlated over a few nanometers, supportive of the notion of cooperatively-rearranging-regions (CRR) containing of order 100 molecules. But details of the local cooperative dynamics are still mysterious. Certain issues, such as the heterogeneity lifetime, and whether local relaxation within a CRR is exponential, remain controversial. I will describe experiments in which molecular cooperativity was directly observed near the glass transition, through nanoscale probing of dipolar noise in polymer glasses. The dynamics and evolution of individual CRR was studied. Surprisingly, individual CRR were found to revisit a handful of configurations up to hundreds of times. Statistical analysis of the noise gives information about the lifetime of the CRR, the local shape and evolution of the energy landscape, and the evolution from exponential to nonexponential response within a CRR.
机译：最近的许多实验和模拟都强烈支持玻璃材料中动力学在空间上是异质的想法。弛豫时间似乎与数纳米相关，支持了包含100个分子的合作重排区域（CRR）的概念。但是，当地合作动态的细节仍然是个谜。某些问题（例如异质性寿命以及CRR中的局部弛豫是否为指数）仍然存在争议。我将描述通过聚合物玻璃中偶极噪声的纳米级探测直接在玻璃化转变附近观察到分子协同性的实验。研究了个人CRR的动态和演变。令人惊讶的是，发现单个CRR最多可以重新访问少数配置。噪声的统计分析可提供有关CRR的寿命，能量形态的局部形状和演变以及CRR内从指数响应到非指数响应的演变的信息。

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