论文标题
动力学脆弱性与泊松的比率之间的相关性来自软胶体的数据分析
Correlation between kinetic fragility and Poisson's ratio from analysis of data for soft colloids
论文作者
论文摘要
我们考虑了脆弱性与弹性之间的联系，而弹性是从对Mattsson等报道的可变形球体组成的一组软胶体材料的数据分析之后进行的。 Al。，在自然界第462、83（2009）中。从所谓的玻璃过渡点附近的长时间放松的密度依赖性获得了软胶体的脆弱指数。此外，我们将相应软胶体的高频剪切模量的数据拟合到相同模量的相应理论表达式中。这种弹性常数的表达是根据液体密度均匀的液体的相应对相关函数而言。通过适当选择参数的适当选择，为各自的软胶体材料的两个身体相互作用潜力调整了对相关函数。与分子玻璃相比，与软胶体观察到的脆性和泊松比之间相关性的性质在质量上有所不同。在亚稳态液体的脆弱性与其弹性系数之间观察到的联系是流体结构对其动力学的影响的表现。
We consider the link between fragility and elasticity that follows from analysis of the data for a set of soft-colloid materials consisting of deformable spheres reported by Mattsson et. al., in Nature vol 462, 83 (2009). Fragility index for a soft-colloid is obtained from the density dependence of the long time relaxation near a so-called glass transition point. In addition, we fit data for the high frequency shear modulus for the respective soft-colloid to a corresponding theoretical expression for the same modulus. This expression for the elastic constant is in terms of the corresponding pair correlation function for the liquid treated as of uniform density. The pair correlation function is adjusted through a proper choice of the parameters for the two body interaction potential for the respective soft-colloid material. The nature of correlation between the fragility and Poisson ratio observed for the soft colloids is qualitatively different, as compared to the same for molecular glasses. The observed link between fragility of a metastable liquid and its elastic coefficients is a manifestation of the effects of structure of the fluid on its dynamics.
