1. Center of Excellence in Nanotechnology (CENT); King Fahd University of Petroleum and Minerals; KFUPM Box 5040 Dhahran 31261 Saudi Arabia
2. Department of Chemical Engineering; King Fahd University of Petroleum and Minerals; KFUPM Box 5040 Dhahran 31261 Saudi Arabia
3. Surface Properties Research Team; Korea Basic Science Institute; Busan Center Busan 609-735 South Korea