Abstract / Description of output
A finite element model of the electrostatic double layer interaction between an approaching colloidal particle and a small region of a charged planar surface containing four previously deposited particles is presented. The electrostatic interaction force experienced by the approaching particle is obtained by solving the Poisson−Boltzmann equation with appropriate boundary conditions representing this complex geometry. The interaction forces obtained from the detailed threedimensional finite element simulations suggest that for the manybody scenario addressed here, the electrostatic double layer repulsion experienced by the approaching particle is less than the corresponding sphere−plate interaction due to the presence of the previously deposited particles. The reduction in force is quite significant when the screening length of the electric double layer becomes comparable to the particle radius (κa ∼ 1). The results also suggest that the commonly used technique of pairwise addition of binary interactions can grossly overestimate the net electrostatic double layer interaction forces in such situations. The simulation methodology presented here can form a basis for investigating the influence of several previously deposited particles on the electrostatic repulsion experienced by a particle during deposition onto a substrate.
Original language  English 

Pages (fromto)  4755–4764 
Journal  Langmuir 
Volume  21 
Issue number  10 
DOIs  
Publication status  Published  2005 
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Dive into the research topics of 'Electrostatic Double Layer Force between a Sphere and a Planar Substrate in the Presence of Previously Deposited Spherical Particles'. Together they form a unique fingerprint.Prizes

Dorothy J. Killam Memorial Graduate Prize
Das, Prodip (Recipient), 2004
Prize: Prize (including medals and awards)