用重整化群理论研究胶体模型体系的相行为

用yukawa势能函数表达胶体颗粒之间的吸引作用。用Duh-Mier-Y-Teran状态方 程表达液相Helmholtz自由能。用一阶微扰理论、固体硬球径向分布函数解析式和 改进的胞腔模型建立固相状态方程，结合建立的状态方程和重整化群理论。研究了 胶体模型体系的液-液相平衡和液-固相平衡。研究表明，颗粒之间色散作用量程参 数的变化对胶休到本世纪末茶杯 系的相行为有特殊需要影响。所得结果与分子模 拟数据吻合良好。

Investigation of the Phase Behaviour for Colloidal Model Systems by Renormalization-Group Theory

The Yukawa potential was used for the attractive interaction of colloid al particles. The Duh-Mier-Y- Teran's equation of state (EOS) was used to expre ss the Helmholtz free energy for the fluid phase. The first-order perturbation theory, the analytical expression of the radial distribution function (RDF) for the hard sphere potential in the FCC-crystal structure and the modified cell mo del were combined to establish the EOS for the solid phase. By using the establi s hed EOS and the renormalization-group (RG) theory, the fluid-fluid and fluid- solid equilibria for colloidal model systems were studied. Investigation shows t h at the attractive range parameter plays an important role in the phase transitio n of colloidal model systems. The obtained results agree well with the simulatio n data.