Direct Observation of Rigid-Body Rotation of Cholesteric Droplets Subjected to a Temperature Gradient
Direct Observation of Rigid-Body Rotation of Cholesteric Droplets Subjected to a Temperature Gradient
复制标题
DOI：
10.7566/jpsj.88.063601
复制
发表时间：
2019-06-15
影响因子：
1.7
通讯作者：
Tabe, Yuka
中科院分区：
文献类型：
--
作者：
Nishiyama, Katsu;Bono, Shinji;Tabe, Yuka
当受到垂直于其螺旋轴的热梯度时，双折射液晶的液滴旋转其螺旋结构。关于其动力学的解释，有一个争论是否纹理旋转表示刚体旋转的液滴或纯粹的导演旋转。为了澄清这一点，我们分散在胆固醇各向同性共存的样品中的微米尺寸的颗粒，并跟踪它们的运动，发现粘附在微滴上的颗粒与螺旋线一起旋转。这一观察结果提供了明确的证据，刚体旋转的液滴，我们也揭示了一个不寻常的流体动力学流动的共存阶段。
Droplets of cholesteric liquid crystals rotate their helical structure when subjected to a thermal gradient perpendicular to their helical axes. Concerning the interpretation of their dynamics, there has been an argument whether the textural rotation indicates rigid-body rotation of the droplets or pure director rotation. To clarify this, we dispersed micron-size particles in a cholesteric-isotropic coexisting sample and traced their motion, and found that the particles adhering onto a cholesteric droplet rotated together with the helix in phase. This observation provided clear evidence of the rigid-body rotation of the droplet, and we also revealed an unusual hydrodynamic flow in the coexisting phase.