论文标题
带有活性Janus颗粒的二维复合物（灰尘）等离子体
Two-dimensional complex (dusty) plasma with active Janus particles
论文作者
论文摘要
通过实验研究了含有活性Janus颗粒的二维复合血浆。在低压下，将单层的微米大小塑料微球悬挂在氩气射场的血浆鞘中。所使用的粒子样品是常规颗粒和Janus颗粒的混合物，它们的一侧涂有一层薄层的铂。与仅由常规颗粒组成的悬浮液不同，在所使用的实验条件下，包含Janus颗粒的悬浮液不会形成有序的晶格。取而代之的是，颗粒在无序悬架中以高动能的高度移动。出乎意料的是，随着照明激光功率的增加，颗粒的平均动能下降。这是通过两个驱动力的竞争，即光性力量和相对指向的离子阻力来解释的。粒子的平均值位移缩放为$ t^α$，$α= 2 $在小时$ t $，表明弹道运动，$α= 0.56 \ pm0.27 $在更长的时间内，由于Janus粒子强度在圆形轨迹和外部束缚中移动的综合效果。
A two-dimensional complex plasma containing active Janus particles was studied experimentally. A single layer of micron-size plastic microspheres was suspended in the plasma sheath of a radio-frequency discharge in argon at low pressure. The particle sample used was a mixture of regular particles and Janus particles, which were coated on one side with a thin layer of platinum. Unlike a suspension consisting of regular particles only, the suspension with inclusion of Janus particles did not form an ordered lattice in the experimental conditions used. Instead, the particles moved around with high kinetic energy in a disordered suspension. Unexpectedly, the mean kinetic energy of the particles declined as the illumination laser power was increased. This is explained by the competition of two driving forces, the photophoretic force and the oppositely directed ion drag force. The mean-squared displacement of the particles scaled as $t^α$ with $α=2$ at small times $t$ indicating ballistic motion and $α=0.56\pm0.27$ at longer times due to the combined effect of the Janus particle propensity to move in circular trajectories and external confinement.
