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The role of interface on molecular mobility of glasses or 'Can Cathedral Glasses Flow'

机译:界面对玻璃分子流动性或“大教堂玻璃杯能否流动”的作用

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Our investigation demonstrates the role of interfaces for molecular mobility of glasses. Usually, the role of the surface layer is neglected because it contains about 10(-8) of the number of molecules of the sample. However, the interface is important in several cases: For the thin films; for the processes taking part at the interface (e.g. surface crystallization) and in the cases when bulk molecules are practically immobile. We define a critical temperature T-c, below which surface molecules have more important contribution then the bulk ones. As soon as this happens in the vicinity, or rather below, the glass transition temperature, the samples behave solid like. So, the contribution of the surface mobility is not sufficient to cause changes in human life period but it is large enough to permit tiny changes in historical periods. This could be an explanation why cathedral glasses are a couple of microns thicker at the bottom side. (c) 2006 Elsevier B.V. All rights reserved.
机译:我们的研究表明界面对于玻璃分子迁移的作用。通常,表面层的作用被忽略了,因为它包含了大约10(-8)个样品分子数量。但是,界面在某些情况下很重要:对于薄膜;对于薄膜;对于薄膜。用于参与界面的过程(例如表面结晶)以及本体分子实际上不动的情况。我们定义了一个临界温度T-c,在该温度以下,表面分子比本体分子具有更重要的作用。一旦这发生在玻璃化转变温度附近或更低,样品就会表现为固体。因此,表面迁移率的贡献不足以引起人类生命周期的变化,但它的大小足以允许历史周期的微小变化。这可以解释为什么大教堂玻璃的底面要厚几微米。 (c)2006 Elsevier B.V.保留所有权利。

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