1. Key Laboratory for Colloid and Interface Chemistry of State Education Ministry, Shandong University, ShanDa South Road, Jinan, Shandong 250100, P. R. China
2. Geological Scientific Research Institute, Shengli Oilfield, Dongying 257015, P. R. China
3. Langmuir Center for Colloids and Interfaces, Columbia University, New York, New York 10027, United States