Distinguished Lecture Series
Dr. Howard Stone
Digital Microfluidics: Drops, Bubbles, Jets and Colloidal Armor
Thursday, January 27
1:00 pm - 2:00 pm
The ability to transport and
manipulate fluids on the scale of hundreds of microns and smaller
has triggered a wide range of scientific investigations and
technological applications. One avenue for investigation concerns
the manipulation of multiphase flows.
Dr. Stone will present microfluidic
experiments illustrating the controlled formation of liquid drops
and gas bubbles with attention given to the drop size as function of
the flow rate of two fluid phases. Methods for manipulating the drop
size distribution will be presented.
The presentation will close by showing how
these ideas can be implemented to continuously make drops coated
with a close-packed shell of colloidal particles, or colloidal
armor, which leads to a material with unusual elastic properties.
Technological opportunities for these multiphase systems will be
highlighted and basic research questions in fluid mechanics and
transport processes will be indicated.