Direct measurement of colloidal forces in an anisotropic solvent
Direct measurement of colloidal forces in an anisotropic solvent
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DOI：
10.1103/physrevlett.79.4862
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发表时间：
1997-12-15
影响因子：
8.6
通讯作者：
Weitz, DA
中科院分区：
文献类型：
--
作者：
Poulin, P;Cabuil, V;Weitz, DA
我们提出了一种新的方法来测量胶体粒子之间的吸引相互作用，并确定了悬浮在向列相液晶中的粒子之间的吸引力的性质。我们将充满磁流体的液滴限制在薄层中，并施加磁场来感应偶极矩，使液滴分开。当磁场被移除时，吸引人的相互作用会将液滴拉回一起。力是由速度决定的，因为运动是粘性阻尼的。我们证实了向列相溶剂中液滴间相互作用的偶极特性。
We present a new method to measure attractive interactions between colloidal particles, and determine the nature of the attraction between particles suspended in a nematic liquid crystal, We confine droplets filled with ferrofluid to a thin layer and apply a magnetic field to induce dipole moments that drive the droplets apart. When the field is removed, the attractive interactions pull the droplets back together. The force is determined from the velocity because the motion is viscously damped. We confirm the dipolar character of the interaction between droplets in a nematic solvent.