1. Key Laboratory for Liquid Structure and Heredity of Material, Ministry of Education, Jinan 250061, P R China; 2. Department of Math and Physics, Shandong University of Technology, Jinan 250061, P R China3. College of Material Science and Engineer, Shandong Uniuersity of Technology, Jinan 250061, P R China; 3. College of Material Science and Engineer, Shandong Uniuersity of Technology, Jinan 250061, P R China