Diffusion and surface excess of a confined nanoswimmer dispersion.
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 v(a), and run time τ. Our simulation results show that (D-D0)/v(a)(2)τ is a function of v(a)τ/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 c(b), swimming speed v(a), 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/Hc(b) is a function of H/v(a)τ.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Song
S
Xiao
Department of Chemical and Materials Engineering, National Central University, Jhongli 320, Taiwan.
Zhengjia
Z
Wang
Department of Physics, National Central University, Jhongli 320, Taiwan.
Hsuan-Yi
HY
Chen
Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.
Yu-Jane
YJ
Sheng
Department of Chemical and Materials Engineering, National Central University, Jhongli 320, Taiwan.
Heng-Kwong
HK
Tsao
D003102:Colloids / Q000737:chemistry*; D004058:Diffusion; D053758:Nanoparticles / Q000737:chemistry*; D013499:Surface Properties
D003102:Colloids