Document Detail


Interaction of micrometer-scale particles with nanotextured surfaces in shear flow.
MedLine Citation:
PMID:  17254594     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Dynamic particle adhesion from flow over collecting surfaces with nanoscale heterogeneity occurs in important natural systems and current technologies. Accurate modeling and prediction of the dynamics of particles interacting with such surfaces will facilitate their use in applications for sensing, separating, and sorting colloidal-scale objects. In this paper, the interaction of micrometer-scale particles with electrostatically heterogeneous surfaces is analyzed. The deposited polymeric patches that provide the charge heterogeneity in experiments are modeled as 11-nm disks randomly distributed on a planar surface. A novel technique based on surface discretization is introduced to facilitate computation of the colloidal interactions between a particle and the heterogeneous surface based on expressions for parallel plates. Combining these interactions with hydrodynamic forces and torques on a particle in a low Reynolds number shear flow allows particle dynamics to be computed for varying net surface coverage. Spatial fluctuations in the local surface density of the deposited patches are shown responsible for the dynamic adhesion phenomena observed experimentally, including particle capture on a net-repulsive surface.
Authors:
Ranojoy D Duffadar; Jeffrey M Davis
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Publication Detail:
Type:  Journal Article     Date:  2007-01-04
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  308     ISSN:  0021-9797     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-02-12     Completed Date:  2007-05-15     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  20-9     Citation Subset:  -    
Affiliation:
Department of Chemical Engineering, University of Massachusetts, Amherst, MA 01003, USA.
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