1. Institute for Clean Energy and Advanced MaterialsSchool of Materials and EnergySouthwest University Chongqing 400715 P. R. China
2. Electronic & Magnetic Materials Department, Advanced Materials DivisionCentral Metallurgical Research and Development Institute (CMRDI), Helwan P.O. Box 87 Cairo 11421 Egypt
3. School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 P. R. China
4. Petroleum Application DepartmentEgyptian Petroleum Research Institute (EPRI), Nasr City 11727 Cairo Egypt