2007/06/30 by Luis F. Rojas-Ochoa, L. F. Rojas-Ochoa, Ramón Castañeda-Priego +5
Chemistry · Materials Science · Physics and Astronomy · #Chemical physics #Chemistry #Colloid #Colloidal particle #Composite material #Condensed matter physics #Electrostatics and Colloid Interactions #Ion #Ionic bonding #Ionic strength #Light scattering #Material Dynamics and Properties #Materials science #Neutron scattering #Optics #Particle (ecology) #Physical chemistry #Physics #Range (aeronautics) #Scattering #Spectroscopy and Quantum Chemical Studies #Structure factor #Suspension (topology) #cond-mat.soft
paper · pdf · doi:10.1103/physrevlett.100.178304
published as Phys. Rev. Lett. 100, 178304 (2008) · Revised version, accepted to Phys. Rev. Lett
arxiv created 2008/04/10 · openalex publication_date 2008/05/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We determine the structure of charge-stabilized colloidal suspensions at low ionic strength over an extended range of particle volume fractions using a combination of light and small angle neutron scattering experiments. The variation of the structure factor with concentration is analyzed within a one-component model of a colloidal suspension. We show that the observed structural behavior corresponds to a nonmonotonic density dependence of the colloid effective charge and the mean interparticle interaction energy. Our findings are corroborated by similar observations from primitive model computer simulations of salt-free colloidal suspensions.