1. Department of PhysicsUniversity of Gujrat Gujrat Pakistan
2. Sustainable Energy Technologies CenterCollege of EngineeringKing Saud University, PO-Box 800 Riyadh 11421 Saudi Arabia
3. Department of Chemical EngineeringCollege of EngineeringKing Saud University, PO-Box 800 Riyadh 11421 Saudi Arabia