Lab Home | Phone | Search
Center for Nonlinear Studies  Center for Nonlinear Studies
 Colloquia Archive 
 Postdoc Seminars Archive 
 Quantum Lunch 
 Quantum Lunch Archive 
 CMS Colloquia 
 Q-Mat Seminars 
 Q-Mat Seminars Archive 
 P/T Colloquia 
 Kac Lectures 
 Kac Fellows 
 Dist. Quant. Lecture 
 Ulam Scholar 
 CNLS Fellowship Application 
 Student Program 
 Past Visitors 
 History of CNLS 
 Maps, Directions 
 CNLS Office 
Monday, October 27, 2008
3:00 PM - 4:00 PM
CNLS Conference Room (TA-3, Bldg 1690)


Transport control in fluidic micro and nanochannels

Dimiter N. Petsev
Center for Biomedical Engineering and Department for Chemical and Nuclear Engineering, University of New Mexico at Albuquerque

Micro and nanofluidics have a great potential for implementation in a variety of new technologies and applications. Examples include chemical and biomolecular sensing, separation, iomolecules manipulation, sample preconcentration and focusing, conducting small scale liquid reactions, monodisperse droplet and particles fabrication. As the channels dimensions become smaller, the Reynolds numbers characterizing the flow become lower and the viscous effects become dominant. A typical example is mixing, which for micro and nanofluidic devices requires completely new approaches. Controlling the fluids, current and analytes in fluidic systems also requires the development of pumps and valves to direct and manipulate the liquid and dissolved species. Nanochannels present an additional complexity due to strong electrostatic potential effects in the electric double layers at the channel walls. These lead to difficulties but also give rise to new opportunities for the processing of fluids and analytes.

This presentation summarizes some of our recent results on fluid control and manipulation in micro and nanochannels. We suggest a new approach for designing micropumps, mixers and separators using semiconductor diodes powered by an alternate current electric field. A theoretical analysis of the electric field distribution in fluidic nanochannels offers strategies for transport control at the nanoscale. Finally we demonstrate the utility of microfluidics to fabricate monodisperse particles with well defined sized and internal mesoporous structure.

Host: Boian Alexandrov, T-11