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Prof. Darrell Velegol

Penn State, Department of Chemical Engineering

Date: February 14, 2014

Time: 4:15 p.m. Friday

Location: 1519 Engr II

Producing flows in dead-end pores is not currently possible through conventional pressure-driven mechanisms. Furthermore, in practical situations inducing such flows is challenging using mechanisms like electrophoresis, since one might be interested in geologic or biological systems. How to achieve flows in dead-end pores, especially in hard-to-reach places? We will explore one potential technique: "transient diffusiophoresis". This phenomonen has been known since 1947, but the mechanism is subtle and seldom used. This talk will focus on the mechanism of diffusiophoresis, the practical applications with dead-end pores and membranes, and possibilties for producing flows in challenging chemical environments.

Darrell Velegol attended West Virginia University for his BS in Chemical Engineering, and he earned his PhD in Chemical Engineering at Carnegie Mellon University in 1997 working with Professors John L. Anderson and Stephen Garoff. In 1998 Velegol won the Victor K. LaMer Award of the American Chemical Society for the best PhD in the field of Colloid & Surface Science. He continued with a post-doc in the Center for Light Microscope Imaging and Biotechnology at Carnegie Mellon, working under Professor Fred Lanni of the Biology Department. In June 1999 Velegol joined the Department of Chemical Engineering at Penn State, where he was promoted to Associate Professor in 2005. Velegol won an NSF CAREER Award in 2000, and has continued to be funded by NSF, DOE, EPA, PRF, the Air Force, and other agencies for his work with colloidal forces, colloidal assembly, electrokinetic flows, and colloidal motors. His research investigates the fabrication of colloidal assemblies and devices with a specialty in understanding interparticle forces and transport processes. His research group uses a wide range of experimental and modeling approaches. In 2009 Velegol was promoted to Full Professor at Penn State. For his work in experimental and theoretical problems in the dynamics of complex colloidal particles, Velegol was elected a Fellow of the American Association for the Advancement of Science in 2011, and appointed as a Distinguished Professor at Penn State in 2012. He is a member of ACS, AIChE, AAAS, and ASEE. More recently, he has engaged in studying the "physics of community", pursuing questions in learning, creativity, motivation, trust and deceit, courage, and other social science ideas using results from physics, chemistry, biology, and chemical engineering. In 2011 he published a book, Wild Scholars, available through, and he seeks to impact education from grade school to college. In 2013, he published a book CENTER, which details six practices needed to go from your passions and purposes, to making a change in the world. In Fall 2013, he taught a MOOC called "Creativity, Innovation, and Change", which enrolled over 120,000 students from over 150 nations.

Other Seminars
  Biological Sciences
  Chemistry & Biochemistry
  Computer Science
  Electrical & Computer Engineering
  Mechanical Engineering

Institutes and Centers
  Center for Control, Dynamical
    Systems & Computation (CDCC)

  Research in Fluid Physics (CIRF)
  Institute for Collaborative
    Biotechnologies (ICB)

  Kavli Institute for
    Theoretical Physics (KITP)

  Materials Research Laboratory (MRL)




ucsb Contact Information
Dept. of Chemical Engineering
Univ. of California, Santa Barbara
Santa Barbara, CA 93106-5080
Phone: (805) 893-3412
FAX: (805) 893-4731