TY - JOUR

T1 - Disappearance of the gas-liquid phase transition for highly charged colloids

AU - Hynninen, A. P.

AU - Panagiotopoulos, Athanassios Z.

PY - 2007/5/8

Y1 - 2007/5/8

N2 - We calculate the full phase diagram of spherical charged colloidal particles using Monte Carlo free energy calculations. The system is described using the primitive model, consisting of explicit hard-sphere colloids and point counterions in a uniform dielectric continuum. We show that the gas-liquid critical point becomes metastable with respect to a gas-solid phase separation at colloid charges Q 20 times the counterion charge. Approximate free energy calculations with only one and four particles in the fluid and solid phases, respectively, are used to determine the critical line for highly charged colloids up to Q=2000. We propose the scaling law Tc*∼Q1/2 for this critical temperature.

AB - We calculate the full phase diagram of spherical charged colloidal particles using Monte Carlo free energy calculations. The system is described using the primitive model, consisting of explicit hard-sphere colloids and point counterions in a uniform dielectric continuum. We show that the gas-liquid critical point becomes metastable with respect to a gas-solid phase separation at colloid charges Q 20 times the counterion charge. Approximate free energy calculations with only one and four particles in the fluid and solid phases, respectively, are used to determine the critical line for highly charged colloids up to Q=2000. We propose the scaling law Tc*∼Q1/2 for this critical temperature.

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U2 - 10.1103/PhysRevLett.98.198301

DO - 10.1103/PhysRevLett.98.198301

M3 - Article

C2 - 17677666

AN - SCOPUS:34547469489

VL - 98

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 19

M1 - 198301

ER -