1. Dept. of Engineering Science and Mechanics, The Designed Interphase Group, Virginia Tech, Blacksburg, VA 24061; presently, Dow Chemical Company, 2301 N. Brazosport Blvd., Freeport, TX 77541 (corresponding author).
2. Dept. of Engineering Science and Mechanics, The Designed Interphase Group, Virginia Tech, Blacksburg, VA 24061.
3. Dept. of Chemical Engineering, The Designed Interphase Group, Virginia Tech, Blacksburg, VA 24061.