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二元高斯核模型的相不稳定性研究
引用本文:郭媛媛,陈晓松. 二元高斯核模型的相不稳定性研究[J]. 物理学报, 2005, 54(12): 5755-5762
作者姓名:郭媛媛  陈晓松
作者单位:华中师范大学粒子物理研究所,武汉 430079;中国科学院理论物理研究所,北京 100080
基金项目:国家自然科学基金(批准号:90103031)资助的课题.
摘    要:
从考虑巨势Ω在平衡点附近随密度的微小涨落δρα(r)的变化出发,由系统的关联函数可以研究描述高分子链二元系统的相不稳定性.在超网链(HNC)近似下研究了二元高斯核模型的相不稳定性,得到了它的相不稳定线,同时确定此相变是由浓度涨落为主的相不稳定性引起的退混合相变.将HNC近似下的结果与随机相近似下的结果进行了比较.关键词:高斯核模型关联函数相不稳定性高分子链

关 键 词:高斯核模型  关联函数  相不稳定性  高分子链
文章编号:1000-3290/2005/54(12)/5755-08
收稿时间:2005-02-06
修稿时间:2005-02-062005-07-25

Investigation of phase instability in the binary Gaussian core model
Guo Yuan-Yuan,Chen Xiao-Song. Investigation of phase instability in the binary Gaussian core model[J]. Acta Physica Sinica, 2005, 54(12): 5755-5762
Authors:Guo Yuan-Yuan  Chen Xiao-Song
Affiliation:1.Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China; 2. Institute of Theoretical Physics , Chinese Academy of Sciences , Beijing 100080, China
Abstract:
By considering the fluctuation of grand potential Ω around equilibrium with respect to small density fluctuations δρα(r), the phase instability of binary Gaussian core model has been investigated and characterized. The spinodal of this model is obtained by using its direct correlation functions calculated in the hypernetted chain(HNC) approximation. Our analysis shows that this phase transition is predominately demixing. The results in HNC approximation have been compared with that in the random phase approximation.
Keywords:Gaussian core model   correlation function   phase instability   polymer chain
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