Disappearance of the Gas-Liquid Phase Transition for Highly Charged Colloids

by: AP Hynninen, AZ Panagiotopoulos

Physical Review Letters, Vol. 98, No. 19. (2007)

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Abstract

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 Q20 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*" align="middle">~Q1/2 for this critical temperature.

@article{citeulike:1283531, abstract = {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 Q20 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*" align="middle">~Q1/2 for this critical temperature.}, author = {Hynninen, A. P. and Panagiotopoulos, A. Z. }, citeulike-article-id = {1283531}, doi = {10.1103/PhysRevLett.98.198301}, journal = {Physical Review Letters}, keywords = {2007, charge, colloids, phase}, number = {19}, posted-at = {2008-03-18 22:48:05}, priority = {2}, publisher = {APS}, title = {Disappearance of the Gas-Liquid Phase Transition for Highly Charged Colloids}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000098000019198301000001\&idtype=cvips\&gifs=yes}, volume = {98}, year = {2007} }

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TY - JOUR ID - citeulike:1283531 TI - Disappearance of the Gas-Liquid Phase Transition for Highly Charged Colloids JF - Physical Review Letters VL - 98 IS - 19 PB - APS 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 Q20 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*" align="middle">~Q1/2 for this critical temperature. KW - 2007 KW - charge KW - colloids KW - phase AU - Hynninen, AP AU - Panagiotopoulos, AZ PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000098000019198301000001&idtype=cvips&gifs=yes ER -

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