2002/09/30 by Gabriel Téllez, Gabriel Tellez, Emmanuel Trizac · 2 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Electrostatics and Colloid Interactions #Material Dynamics and Properties #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1063/1.1538604
published as J. Chem. Phys. 118, 3362-3367 (2003)
arxiv created 2002/12/03 · openalex publication_date 2003/02/10 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study theoretically the bulk modulus (inverse of the compressibility) of a suspension of charged objects (macroions), making use of a cell model to account for the finite density of macroions. The diffuse layer of charged microspecies around a macroion is described by a generic local density functional theory. Within this general framework, we obtain the condition for a positive bulk modulus, which is fulfilled by several proposals made in the literature and rules out the possibility of a critical point. We show that a sufficient condition for a positive compressibility also ensures that the same theory produces repulsive effective pair potentials.