Institute of Chemistry, Universidade Estadual de Campinas, P.O. Box 6154, Campinas, São Paulo, 13083-970, Brazil.
Small. 2010 Feb 22;6(4):565-72. doi: 10.1002/smll.200901976.
Experimental and theoretical studies of the self-propelled motional dynamics of a new genre of catalytic sphere dimer, which comprises a non-catalytic silica sphere connected to a catalytic platinum sphere, are reported for the first time. Using aqueous hydrogen peroxide as the fuel to effect catalytic propulsion of the sphere dimers, both quasi-linear and quasi-circular trajectories are observed in the solution phase and analyzed for different dimensions of the platinum component. In addition, well-defined rotational motion of these sphere dimers is observed at the solution-substrate interface. The nature of the interaction between the sphere dimer and the substrate in the aqueous hydrogen peroxide phase is discussed. In computer simulations of the sphere dimer in solution and the solution-substrate interface, sphere-dimer dynamics are simulated using molecular-dynamics methods and solvent dynamics are modeled by mesoscopic multiparticle collision methods taking hydrodynamic interactions into account. The rotational and translational dynamics of the sphere dimer are found to be in good accord with the predictions of computer simulations.
首次报道了一种新型催化球体二聚体的自主运动动力学的实验和理论研究，该二聚体由连接到催化铂球体的非催化硅球体组成。使用水性过氧化氢作为燃料来实现球体二聚体的催化推进，在溶液相中观察到准线性和准圆形轨迹，并针对不同尺寸的铂组件进行了分析。此外，在溶液-基底界面处观察到这些球体二聚体的明确旋转运动。讨论了球体二聚体在水性过氧化氢相中和基底之间的相互作用的性质。在溶液和溶液-基底界面中二聚体的计算机模拟中，使用分子动力学方法模拟球体二聚体的动力学，并且通过考虑流体动力相互作用的介观多粒子碰撞方法来模拟溶剂动力学。发现球体二聚体的旋转和平移动力学与计算机模拟的预测非常吻合。
