Research On Loading And Motion Behavior Of Janus Colloid Motors In The Microcapsules

Active matter could “communication”through some sample rules and exhibit interesting and relatively complex collective behaviors.Similar to the active matter,artificial colloid motors could convert energy from surroundings into mechanical energy to realize self-propulsion,and achieve "communication" through the interaction of hydrodynamic,phoretic,electrostatic field and other forces,resulting in the emergence of various collective behaviors,which has aroused the wide attention of the community.In the past two decades,research on colloid motors has been developed rapidly.However,the experimental studies on collective behaviors of artificial colloid motors are mostly confined to the two-dimensional plane.Explore the collective behavior of the colloid motors in three-dimensional system is urgent reaearch direction,which is conducive to the understanding of collective behaviors and the development of novel biomimetic systemsIn this paper,based on the sodium alginate hydrogel template method,polyelectrolyte microcapsules loaded with artificial colloid motors were prepared by layer-by-layer assembly technology.To some extent,the self-propelled ability of the motor is maintained,and the purpose of placing the Janus motor in a three-dimensional environment is realized.Through experimental investigation,it is proved that the optimal concentration of sodium alginate is 0.8%;the six polyelectrolyte bilayer membranes are the optimal number of assembly layers for stable microcapsules.Futher,it was found that when the concentration of sodium chloride in the microcapsules is reduced to 0.05 M,the colloid motor in the microcapsules show weak activity,and the lower the concentration of sodium chloride,the higher the activity of the colloidal motor.However,when the sodium chloride salt concentration drops below 0.05 M,a large number of microcapsules are damaged,but there are still intact microcapsules within a certain period of time.Through the exploration of a series of conditions,the microcapsules loaded with the colloidal motor were successfully prepared,and the movement activity of the artificial colloid motor was maintained.In addition,the speed of the colloid motor inside the microcapsule was higher than that near the solid substrate.When the microcapsules loaded with colloid motors were placed in hydrogen peroxide solution,various collective behaviors were observed,including collective behaviors similar to those in two-dimensional planes,such as dynamic self-assembly and self-assembly of colloidal motors with inert particles.In addition,due to the limitation of microcapsules,high-density clusters are formed at the bottom of microcapsules,as well as shows the phenomenon of active fluid correlate phenomenon.To sum up,microcapsule loaded with a chemically driven colloid motor was constructed by bottom-up method,and maintains the self-propelled activity of the colloid motors in the microcapsules.In this system,the artificial colloid motors exhibit many interesting collective behaviors.These researches provide a good basis for further studying the movement and colelective behavior of colloid motors in microcapsules and provide new ideas for understanding the clustering behavior of colloidal motors and constructing biomimetic systems.