Biomedical subjects

DY Chan

Publications and source records attributed to DY Chan.

7 recordsLinked to original sources

PubMed1999

Electrical Double-Layer Interaction between Charged Particles near Surfaces and in Confined Geometries.

The proximity effect of one or two flat surfaces on the double-layer interaction between two identically charged colloidal particles immersed in an electrolyte is examined. Simple analytical formulas are presented for the interaction of (i) two particles in the vicinity of a charged flat surface and (ii) two particles confined between two parallel plates. It is found that the surface(s) can strongly influence the pairwise interaction of the particles, leading to increase, decrease, or even elimination of the electrostatic interaction, in comparison to the corresponding result in an unbounded electrolyte. Copyright 1999 Academic Press.

Journal Article↗

PubMed1999

Long-Range Electrostatic Attractions between Identically Charged Particles in Confined Geometries: An Unresolved Problem.

Long-range electrostatic attractions between identical colloidal particles in confined geometries have been observed experimentally by many workers. A satisfactory theoretical explanation for this behavior has proven elusive. Recent numerical calculations and reports (Nature 393, 621-623, 663-665 (1998)), however, have suggested that this problem is closed by demonstrating that this surprising effect is to be found naturally within the well-established Poisson-Boltzmann (PB) theory. We rigorously prove that these claims are false; within the framework of the PB theory, the interaction between identical colloidal particles is always repulsive, irrespective of whether the particles are isolated or confined. A satisfactory theoretical explanation of this surprising phenomenon thus remains an unresolved problem. Copyright 1999 Academic Press.

Journal Article↗

PubMed1994