1. Department of Mechanical Engineering; Texas A&M University; College Station TX 77843 USA
2. Department of Materials Science and Engineering; Iowa State University; Ames IA 50011 USA
3. Department of Chemistry; Faculty of Science; Cairo University; Orman-Giza 12613 Egypt
4. School of Mechanical and Materials Engineering; Washington State University; Pullman WA 99164-2920 USA