Faculteit Technische Natuurkunde, Technische Universiteit Eindhoven, Postbus 513, 5600 MB Eindhoven, The Netherlands.
Phys Rev Lett. 2013 Jul 19;111(3):037801. doi: 10.1103/PhysRevLett.111.037801. Epub 2013 Jul 16.
We report on single-particle dynamics of strongly interacting filamentous fd virus particles in the liquid-crystalline columnar state in aqueous solution. From fluorescence microscopy, we find that rare, discrete events take place, in which individual particles engage in sudden, jumplike motion along the main rod axis. The jump length distribution is bimodal and centered at half- and full-particle lengths. Our Brownian dynamics simulations of hard semiflexible particles mimic our experiments and indicate that full-length jumps must be due to collective dynamics in which particles move in stringlike fashion in and between neighboring columns, while half jumps arise as a result of particles moving into defects. We find that the finite domain structure of the columnar phase strongly influences the observed dynamics.
我们报告了在水溶液中液晶柱状状态下强相互作用丝状 fd 病毒颗粒的单颗粒动力学。通过荧光显微镜，我们发现了一些罕见的离散事件，其中单个颗粒会沿着主杆轴突然发生跳跃式运动。跳跃长度分布呈双峰分布，中心位于半颗粒长度和全颗粒长度处。我们对硬半柔性颗粒的布朗动力学模拟模拟了我们的实验，并表明全长跳跃必须归因于集体动力学，其中颗粒在相邻柱之间以串状方式移动，而半跳跃则是由于颗粒移动到缺陷中引起的。我们发现柱状相的有限域结构强烈影响了观察到的动力学。
