Motion Analysis of Self-Propelled Pt-Silica Particles in Hydrogen Peroxide Solutions
Motion Analysis of Self-Propelled Pt-Silica Particles in Hydrogen Peroxide Solutions
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DOI：
10.1021/jp101193u
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发表时间：
2010-05-06
影响因子：
2.9
通讯作者：
Showalter, Kenneth
中科院分区：
文献类型：
--
作者：
Ke, Hua;Ye, Shengrong;Showalter, Kenneth
半包覆铂金属的二氧化硅微球在H2O2溶液中进行自推进，平均速度随着H2O2浓度的增加而增加。对颗粒运动的显微镜观察以及图像数据的分割表明，颗粒平均移动时，铂涂层区域的方向与运动方向相反。速度自相关和运动方向分析表明运动方向与粒子方向高度相关。分析了观测时间间隔对测量的平移扩散系数和视颗粒运动的影响。
Silica microspheres that are half-coated with platinum metal undergo self-propulsion in solutions of H2O2, with the average speed increasing with increasing H2O2 concentration. Microscopic observation of the particle motion, with segmentation of the image data, demonstrates that the particles move, on average, with the platinum-coated region oriented opposite to the direction of motion. Velocity autocorrelation and motion direction analyses show that the direction of motion is highly correlated with the particle orientation. The effect of the observation time interval on the measured translational diffusion coefficient and the apparent particle motion is analyzed.