First-order phase transition in unfolding a collapsed polymer: A histogram Monte Carlo simulation

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/39075

Title:	First-order phase transition in unfolding a collapsed polymer: A histogram Monte Carlo simulation
Authors:	Lai,PY
Contributors:	物理研究所
Keywords:	POOR SOLVENT;DNA MOLECULE;BEHAVIOR;DYNAMICS;BRUSH
Date:	1998
Issue Date:	2010-07-08 14:04:07 (UTC+8)
Publisher:	中央大學
Abstract:	The phase transition associated with stretching a collapsed polymer chain (consisting of N monomers) is investigated in detail using the histogram Monte Carlo simulation method and the bond-fluctuation model. The distribution functions for the number of contacts and end-to-end distances an obtained. The free energy profile associated with the transition is explicitly computed. Our results on the energy cumulants and free energy profiles provide direct evidence for the first-order nature of the phase transition. The phase transition occurs in the whole poor solvent regime below the Theta point, chi>chi(c) The free energy barrier at the transition is found to scale with N(chi-chi(c)) Phase diagram for the first-order transition phase boundary is also obtained. We find that the mean-field theory results give only a qualitatively correct picture for the phase transition. [S1063-651X(98)09011-4].
Relation:	PHYSICAL REVIEW E
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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