Diffusion and surface excess of a confined nanoswimmer dispersion

Song Xiao, Zhengjia Wang, Hsuan Yi Chen, Yu Jane Sheng, Heng Kwong Tsao

研究成果: 雜誌貢獻期刊論文同行評審

11 引文 斯高帕斯(Scopus)


The diffusivity and surface excess of nanoswimmers which are confined in two plates with the separation H are explored by dissipative particle dynamics. Both mean squared displacement and velocity autocorrelation function methods are used to study the diffusive behavior of nanoswimmers with the Brownian diffusivity D0 and the results obtained from both methods are consistent. The active diffusivity of confined nanoswimmers (D - D0) depends on the wall separation, swimming speed νa, and run time τ. Our simulation results show that (D - D0)/νa2τ is a function of νaτ/H. The reduction in the diffusivity of active colloids is more significant than that of passive particles. The distribution of nanoswimmers between two parallel walls is acquired and two regions can be identified. The accumulation of nanoswimmers near walls is quantitatively described by the surface excess Γ. It is found that Γ grows as the nanoswimmer concentration cb, swimming speed νa, and run time τ are increased. The coupling between the ballistic trajectory of nanoswimmers and the walls results in nanoswimmer accumulation. The simulation outcomes indicate that Γ/Hcb is a function of H/νaτ.

期刊Journal of Chemical Physics
出版狀態已出版 - 14 11月 2014


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