2009/12/02 by Patrick Wette, Ina Klassen, D. Holland‐Moritz +9
Chemistry · Energy · Materials Science · Physics and Astronomy · #Electrostatics and Colloid Interactions #Iron oxide chemistry and applications #Material Dynamics and Properties #cond-mat.soft
paper · pdf · doi:10.1063/1.3380823
published as THE JOURNAL OF CHEMICAL PHYSICS 132, 131102 (2010) · 10 pages, 3Figures
arxiv created 2009/12/02 · openalex publication_date 2010/04/06 · arxiv updated 2010/09/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
In titration experiments with NaOH, we have determined the full phase diagram of charged colloidal spheres in dependence on the particle density n, the particle effective charge Z(eff) and the concentration of screening electrolyte c using microscopy, light and ultrasmall angle x-ray scattering (USAXS). For sufficiently large n, the system crystallizes upon increasing Z(eff) at constant c and melts upon increasing c at only slightly altered Z(eff). In contrast to earlier work, equilibrium phase boundaries are consistent with a universal melting line prediction from computer simulation, if the elasticity effective charge is used. This charge accounts for both counterion condensation and many-body effects.