Lu Xinhui, Mochrie S G J, Narayanan S, Sandy A R, Sprung M
Department of Physics, Yale University, New Haven, Connecticut 06511, USA.
Phys Rev Lett. 2008 Feb 1;100(4):045701. doi: 10.1103/PhysRevLett.100.045701. Epub 2008 Jan 29.
The onset of structural arrest and glass formation in a concentrated suspension of silica nanoparticles in a water-lutidine binary mixture near its consolute point is studied by exploiting the near-critical fluid degrees of freedom to control the strength of an attraction between particles and multispeckle x-ray photon correlation spectroscopy to determine the particles' collective dynamics. This model system undergoes a glass transition both on cooling and on heating, and the intermediate liquid realizes unusual logarithmic relaxations. How vitrification occurs for the two different glass transitions is characterized in detail and comparisons are drawn to recent theoretical predictions for glass formation in systems with attractive interactions.
通过利用近临界流体自由度来控制颗粒间吸引力的强度，并采用多斑点X射线光子相关光谱法来确定颗粒的集体动力学，研究了在接近其共溶点的水-甲基吡啶二元混合物中二氧化硅纳米颗粒浓悬浮液中结构弛豫和玻璃形成的起始情况。该模型体系在冷却和加热时都会发生玻璃化转变，且中间液体呈现出异常的对数弛豫。详细表征了两种不同玻璃化转变的玻璃化过程，并与具有吸引相互作用的体系中玻璃形成的最新理论预测进行了比较。
