1. Physics Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
2. Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
3. Department of Mathematics, Centre College, Danville, Kentucky 40422, USA
4. Mechanical Engineering Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
5. Chemical Engineering Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA