TY - GEN
T1 - Effect of size polydispersity on liquid-glass crossover, liquid-crystal transition, and gas-liquid transition of Lennard-Jones fluids
AU - Terada, Yayoi
AU - Keyes, Thomas
AU - Kim, Jaegil
AU - Tokuyama, Michio
PY - 2013
Y1 - 2013
N2 - Generalized replica exchange method (gREM) computer simulations are performed on model glass formers, polydisperse Lennard-Jones (LJ) systems at constant pressure, and discuss the effect of size polydispersity on the gas-liquid and liquid-crystal transitions, and on the liquid-glass crossover. At high temperatures in the gas phase, there are no polydispersity effects on the observables. With decreasing temperature, the enthalpy, internal energy and volume decrease with increasing polydispersity, and the gas-liquid transition point shifts to higher temperature. At low temperature, sufficient polydispersity causes the liquid-crystal transition to disappear; the threshold for this phenomenon lies in a polydispersity range of s = 0.15-0.20. Enthalpy and internal energy show the similar behavior over the whole temperature region with changing polydispersity. On the other hand, volume shows a different polydispersity dependence in the liquid, crystal, and glass states. The pressure dependence of polydispersity effects are also discussed, and a preliminary gas-liquid-crystal-glass phase diagram of polydisperse LJ systems is obtained.
AB - Generalized replica exchange method (gREM) computer simulations are performed on model glass formers, polydisperse Lennard-Jones (LJ) systems at constant pressure, and discuss the effect of size polydispersity on the gas-liquid and liquid-crystal transitions, and on the liquid-glass crossover. At high temperatures in the gas phase, there are no polydispersity effects on the observables. With decreasing temperature, the enthalpy, internal energy and volume decrease with increasing polydispersity, and the gas-liquid transition point shifts to higher temperature. At low temperature, sufficient polydispersity causes the liquid-crystal transition to disappear; the threshold for this phenomenon lies in a polydispersity range of s = 0.15-0.20. Enthalpy and internal energy show the similar behavior over the whole temperature region with changing polydispersity. On the other hand, volume shows a different polydispersity dependence in the liquid, crystal, and glass states. The pressure dependence of polydispersity effects are also discussed, and a preliminary gas-liquid-crystal-glass phase diagram of polydisperse LJ systems is obtained.
KW - Gas-Liquid Transition
KW - Glass Transition
KW - Lennard-Jones Fluids
KW - Liquid-Crystal Transition
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U2 - 10.1063/1.4794678
DO - 10.1063/1.4794678
M3 - Conference contribution
AN - SCOPUS:84874677547
SN - 9780735411418
T3 - AIP Conference Proceedings
SP - 776
EP - 783
BT - 4th International Symposium on Slow Dynamics in Complex Systems
T2 - 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku
Y2 - 2 December 2012 through 7 December 2012
ER -