Gomilšek M, Seč D, Skarabot M, Ravnik M, Zumer S, Muševič I
Jožef Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia.
Eur Phys J E Soft Matter. 2010 Dec;33(4):291-6. doi: 10.1140/epje/i2010-10671-6. Epub 2010 Nov 7.
Laser tweezers have been used to drive the oscillations of a chain of entangled colloidal particles in the nematic liquid crystal 5CB. The amplitude and phase of light-driven oscillations have been determined for the motion of individual colloidal particles. The collective motion of 4.8μm silica particles is highly damped for a driving frequency above 0.5Hz. The results were compared to an effective bead-spring model, where the motion of elastically coupled particles is hindered by viscous damping and hydrodynamic coupling. Qualitative agreement between theory and experiment was obtained.
激光镊子已被用于驱动向列型液晶5CB中一串纠缠的胶体粒子的振荡。已确定了单个胶体粒子运动的光驱动振荡的幅度和相位。对于驱动频率高于0.5Hz的情况，4.8μm二氧化硅粒子的集体运动受到高度阻尼。将结果与一个有效的珠簧模型进行了比较，在该模型中，弹性耦合粒子的运动受到粘性阻尼和流体动力耦合的阻碍。理论与实验之间获得了定性的一致性。
