We study the structure and dynamics of colloidal particles with a spherical hard core and a thermo-responsive soft shell over the whole phase diagram by means of small-angle x-ray scattering and x-ray photon correlation spectroscopy. By changing the effective volume fraction by temperature and particle concentration, liquid, repulsive glass. and attractive gel phases are observed. The dynamics slow down with increasing volume fraction in the liquid phase and reflect a Vogel-Fulcher-Tamann behavior known for fragile glass formers. We find a liquid-glass transition above 50 vol.% that is independent of the particles' concentration and temperature. In an overpacked state at effective volume fractions above 1, the dispersion does not show a liquid phase but undergoes a gel-glass transition at an effective volume fraction of 34 vol.%. At the same concentration, extrema of subdiffusive dynamics are found in the liquid phase at lower weight fractions. We interpret this as dynamic precursors of the glass-gel transition.

中文翻译：

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软壳颗粒的玻璃-液体和玻璃-凝胶转变

我们通过小角度 x 射线散射和 x 射线光子相关光谱研究了整个相图上具有球形硬核和热响应软壳的胶体颗粒的结构和动力学。通过温度和颗粒浓度改变有效体积分数，液体，排斥玻璃。并观察到有吸引力的凝胶相。动力学随着液相中体积分数的增加而减慢，并反映了以易碎玻璃成型剂而闻名的 Vogel-Fulcher-Tamann 行为。我们发现超过 50 vol.% 的液体玻璃化转变与粒子的浓度和温度无关。在有效体积分数大于 1 的过度填充状态下，分散体不显示液相，但在有效体积分数为 34 vol.% 时发生凝胶-玻璃化转变。在相同浓度下，在较低重量分数的液相中发现了亚扩散动力学的极值。我们将其解释为玻璃-凝胶转变的动态前体。