Role of viscoelasticity on the dynamics and aggregation of chemically active sphere-dimers

Diffusiophoretically induced interactions between chemically active and inert particles

In the presence of a chemically active particle, a nearby chemically inert particle can respond to a concentration gradient and move by diffusiophoresis. The nature of the motion is studied for two cases: first, a fixed reactive sphere and a moving inert sphere, and second, freely moving reactive and inert spheres. The continuum reaction-diffusion and Stokes equations are solved analytically for these systems and microscopic simulations of the dynamics are carried out. Although the relative velocities of the spheres are very similar in the two systems, the local and global structures of stream…

Many-body dynamics of chemically propelled nanomotors

The collective behavior of chemically propelled sphere-dimer motors made from linked catalytic and noncatalytic spheres in a quasi-two-dimensional confined geometry is studied using a coarse-grained microscopic dynamical model. Chemical reactions at the catalytic spheres that convert fuel to product generate forces that couple to solvent degrees of freedom as a consequence of momentum conservation in the microscopic dynamics. The collective behavior of the many-body system is influenced by direct intermolecular interactions among the motors, chemotactic effects due to chemical gradients, hydro…

Formation of self-propelling clusters starting from randomly dispersed Brownian particles

We present a simple chemical strategy for the formation of a self-propelling cluster via the process of capture and assembly of passive colloids on the surface of a chemically active colloid. The two species of colloids that are isotropic and Brownian otherwise interact to form propelling cluster. With the help of coarse-grained numerical simulations, we show that a chemically active colloid can induce diffusiophoretic motility to nearby chemically inert colloids towards itself. This propulsion and then self-assembly can then lead to the formation of active cluster. We observe the formation of…

Chemistry in Motion: Tiny Synthetic Motors

In this Account, we describe how synthetic motors that operate by self-diffusiophoresis make use of a self-generated concentration gradient to drive motor motion. A description of propulsion by self-diffusiophoresis is presented for Janus particle motors comprising catalytic and noncatalytic faces. The properties of the dynamics of chemically powered motors are illustrated by presenting the results of particle-based simulations of sphere-dimer motors constructed from linked catalytic and noncatalytic spheres. The geometries of both Janus and sphere-dimer motors with asymmetric catalytic activi…

SiO2-Pt活性Janus胶体的聚集体动力学

Clustering Dynamics of SiO2-Pt Active Janus Colloids

研究SiO2-Pt活性Janus胶体在动态聚集体 regime 中的聚集体动力学，揭示了聚集体形成机制的转变及预测性描述。

带活性末端的化学-机械胶体链的集体动力学

Collective dynamics of chemo-mechanical colloidal chains with active tips

本研究探究带化学活性末端的半柔性胶体链的集体动力学，通过调控链长、面积分数和泳动耦合符号绘制非平衡相图，揭示多种集体态及粗粒化理论的适用性，为活性物质集体行为提供可实验实现的极简机制。