摘要
Based on the model of the Wigner-Seitz cell, the surface potential of the spherical macroparticle （radius a） expands in terms of the monopole （q）. A dipole （p） model is assumed for an anisotropic boundary condition of the nonlinear Poisson-Boltzmann equation. Using the finite element method implemented by the FlexPDE software, the potential distribution around the macroparticle is obtained for different ratios p/qa. The calculated results for the potential show that there is an attractive region in the vicinity of the macroparticle when Ip/qal〉l.1, and noticeably there is a potential well behind the macroparticle when Ip/qal=l.1, i.e., there exists both an attractive region and a repulsive region simultaneously. This means that the attractive interaction between macroparticles may arise from the anisotropic distribution of the surrounding plasmas, which well explains some experimental observations.
Based on the model of the Wigner-Seitz cell, the surface potential of the spherical macroparticle （radius a） expands in terms of the monopole （q）. A dipole （p） model is assumed for an anisotropic boundary condition of the nonlinear Poisson-Boltzmann equation. Using the finite element method implemented by the FlexPDE software, the potential distribution around the macroparticle is obtained for different ratios p/qa. The calculated results for the potential show that there is an attractive region in the vicinity of the macroparticle when Ip/qal〉l.1, and noticeably there is a potential well behind the macroparticle when Ip/qal=l.1, i.e., there exists both an attractive region and a repulsive region simultaneously. This means that the attractive interaction between macroparticles may arise from the anisotropic distribution of the surrounding plasmas, which well explains some experimental observations.
基金
supported by National Natural Science Foundation of China (No.50877033)
