首页> 外文会议>NATO Advanced Research Workshop on Liquids Under Negative Pressure Feb 23-25, 2002 Budapest, Hungary >LIMITING TENSIONS FOR LIQUIDS AND GLASSES FROM LABORATORY AND MD STUDIES
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LIMITING TENSIONS FOR LIQUIDS AND GLASSES FROM LABORATORY AND MD STUDIES

机译:实验室和医学研究对液体和玻璃的限制张力

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We discuss first the systematic passage of liquids from states of positive pressure to states of isotropic tension, using spectroscopic characterization methods. We then describe some experimental methods for characterizing the range of temperature under which common liquids an ,1 glassformers can be studied in such negative pressure states. While rather large tensions, up to nearly 200MPa have been obtained in these laboratory studies, much larger tensions can be generated in systems with ong range attractive forces. We characterize the limiting tensions for such cases using the methods of molecular dynamics. In practice, liquids fail by homogeneously nucleated cavitation at tensions far below the spinodal limits defined by equations of state. We anticipate a crossover from nucleated to spinodal failure as the g ass transition temperature meets the spinodal. We lay the basis for the experimental testing of this notion, using laboratory data for the case of the model glassformer, o-terphenyl. In the case of SiO_2 glass we are able to characterize the failure mechanism.
机译:我们首先讨论使用光谱表征方法从正压状态到各向同性张力状态的液体的系统传递。然后,我们描述了一些表征温度范围的实验方法,在这种温度范围内,可以在这种负压状态下研究普通液体和.1玻璃形成剂。尽管在这些实验室研究中获得了相当大的张力,最高可达到200 MPa,但在具有无范围吸引力的系统中,可以产生更大的张力。我们使用分子动力学方法表征了这种情况下的极限张力。实际上,在远低于状态方程所定义的旋节线极限的张力下,液体会因均匀成核的空化而失效。我们预计,随着气体的转变温度达到旋节线,从有核断裂到旋节线失效的过渡。我们使用模型化玻璃成型剂邻三联苯的实验室数据为这一概念的实验测试奠定了基础。在SiO_2玻璃的情况下,我们可以表征失效机理。

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