Contact Information Email: Click to Mail Phone: (805) 893-7383 Fax: (805) 893-4731 Office Location: 3347 Engineering II Address: Mail Code 5080 Chemical Engineering Dept. University of California Santa Barbara, CA 93106-5080 USA

Assistant Information Name: Debbie Watts Phone: (805) 893-8692 Fax: (805) 893-4731

Web Pages Research Group Home Page

Course Pages ChE 132A Analytical Methods in Chemical Engineering ChE 220A Advanced Transport Processes ChE 220B Advanced Transport Processes ChE 230B Advanced Theoretical Methods in Engineering ChE 120A Transport Processes

Education & Honors

BS: Physics (& BA, Russian Language & Lit), UCLA, 1995

PhD: Physics, Harvard, 2002

Honors:
2009 Francois Frenkiel Award for Fluid Mechanics
Camille Dreyfus Teacher-Scholar Award, 2009
Beckman Young Investigator, 2008
NSF CAREER Award, 2007
NSF Mathematical Sciences Postdoctoral Fellowship
Lee A. Dubridge Prize Postdoctoral Fellowship
2005 'Rising Star' - Chronicle of Higher Education

Research

Transport science plays a role in all things dynamical - and can often play the crucial role. As such, it is an extremely versatile science. Learning to think effectively about fluids and transport enables one to understand and contribute to a wide range of interesting and important problems. Our group works various areas of micro-scale fluid mechanics and transport science - microfluidics and electrokinetics, active, nonlinear and interfacial microrheology of complex materials, polymer dynamics and sensors. Current theoretical and experimental projects include (i) non-linear (induced-charge) electrokinetic flows, with an eye towards portable, self-contained and implantable microfluidic devices, (ii) extending the capabilities of "microrheology" (which typically uses colliodal beads as passive tracers to measure the rheological properties of complex materials) by using active forcing to extract nonlinear material response properties; (iii) developing and employing a novel technique for measuring the rheology of fluid-fluid interfaces, with particular emphasis on natural and synthetic lung surfactant layers (in collaboration with Zasadzinski's group) and surfactant-laden polymer-polymer interfaces; (iv) theoretical and experimental investigations into interfacial mobility of nanoparticle and copolymer surfactants (collaboration with Leal and MRL), and (v) understanding the self-assembly and transport properties of nanostructured materials, with applications in ultracapacitors for energy storage (collaboration with Chmelka). This is a wide range of topics, loaded with interesting and important questions - underscoring the versatility of this fascinating field.

Publications

Online Publication List

T.M. Squires, R.J. Messinger, and S.R. Manalis, Making it Stick: convection, reaction and diffusion in surface-based biosensors, Nature Biotechnology, 26, 417 (2008)

A.S. Khair and T.M. Squires, Surprising consequences of ion conservation in electro-osmosis over a surface charge discontinuity, J. Fluid Mech. 615, 323-334 (2008)

T.M. Squires, Nonlinear Microrheology: Bulk stresses vs. direct interactions, Langmuir, 24, 1147-1159 (2008)

T.M. Squires and S.R. Quake, Microfluidics: fluid physics on the nanoliter scale, Reviews of Modern Physics 77, 977-1026 (2005)

T.M. Squires and M.Z. Bazant, Induced charge electro-osmosis, Journal of Fluid Mechanics 509, 217-252 (2004)