Document Detail


An AC electrokinetic technique for collection and concentration of particles and cells on patterned electrodes.
MedLine Citation:
PMID:  15982074     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
We report an electrohydrodynamic effect arising from the application of alternating electric fields to patterned electrode surfaces. The AC fields were applied to dilute suspensions of latex microspheres enclosed between a patterned silicon wafer and an ITO-coated glass slide in a small chamber. The latex particles became collected in the center of the conductive "corrals" on the silicon wafer acting as bottom electrode. The particle collection efficiency and speed depended only on the frequency and strength of the field and were independent of the material properties of the particles or the electrodes. The leading effect in the particle collection process is AC electrohydrodynamics. We discuss how the electrohydrodynamic flows emerge from the spatially nonuniform field and interpret the experimental results by means of electrostatic and hydrodynamic simulations. The technique allows three-dimensional microfluidic pumping and transport by the use of two-dimensional patterns. We demonstrate on-chip collection of latex particles, yeast cells, and microbes.
Authors:
Ketan H Bhatt; Sonia Grego; Orlin D Velev
Related Documents :
18324034 - Ray optics calculation of the radiation forces exerted on a dielectric sphere in an eva...
3663834 - Brownian dynamics simulation of restricted rotational diffusion.
17380254 - Aeolian transport of sand.
16605604 - Equilibrium correlations in charged fluids coupled to the radiation field.
22540684 - Quantum factorization of 143 on a dipolar-coupling nuclear magnetic resonance system.
16210184 - A particulate basis for a lattice-gas model of amphiphilic fluids.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  21     ISSN:  0743-7463     ISO Abbreviation:  Langmuir     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-06-28     Completed Date:  2006-08-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6603-12     Citation Subset:  -    
Affiliation:
Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Investigations into the mechanism of adsorption of carbon nanotubes onto aminopropylsiloxane functio...
Next Document:  Modeling of the hysteresis phenomena in finite-sized slitlike nanopores. Revision of the recent resu...