论文标题
粗糙度在胶体玻璃过渡附近引起的旋转减速
Roughness Induced Rotational Slowdown Near the Colloidal Glass Transition
论文作者
论文摘要
粗糙的球形胶体表面可以大大改变其在密集悬浮液中的平移和旋转动力学。使用3D共聚焦显微镜，我们表明粗糙度不仅降低了翻译胶体玻璃转变的浓度，而且还产生了较大的浓度范围，在该范围内，旋转的布朗运动运动从高振幅扩散到低振幅隆起。当粒子相互表面距离与粗糙度长度尺度相当时，迄今未报告的粗糙球形胶体的第二玻璃转变出现。互锁触点负责限制粒子旋转。
Roughening the surface of spherical colloids can drastically change their translational and rotational dynamics in dense suspensions. Using 3D confocal microscopy, we show that roughness not only lowers the concentration of the translational colloidal glass transition, but also generates a broad concentration range in which the rotational Brownian motion changes signature from high-amplitude diffusive to low-amplitude rattling. This hitherto not reported second glass transition for rough spherical colloids emerges when the particle intersurface distance becomes comparable to the roughness length scale. Interlocking contacts are responsible for restricting the particle rotations.
