Phase Transition of Colloidal Particles with Electric Dipole Moment

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We investigate an effect of electrical dipole moment on the crystallization of charged colloidal systems by simulation. The particles' dynamics obey Langevin equation and the interaction potential is screened Coulomb potential. Consequently, the crystallization point is raised by the moment effect. That is, it becomes difficult to crystallize when the dipole moment is larger. This phenomenon is observed in both cases that crystallize into bcc and into fcc crystal. In polarized colloidal systems, the directions of the moments arrange to lower the energy of the systems when the system is crystallized.

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