UNFOLDING A COLLAPSED MACROMOLECULE - A FIRST-ORDER PHASE-TRANSITION

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/39262

Title:	UNFOLDING A COLLAPSED MACROMOLECULE - A FIRST-ORDER PHASE-TRANSITION
Authors:	LAI,PY
Contributors:	物理研究所
Keywords:	MONTE-CARLO SIMULATION;POLYMER BRUSH;DYNAMICS;SOLVENT
Date:	1995
Issue Date:	2010-07-08 14:10:09 (UTC+8)
Publisher:	中央大學
Abstract:	Using a simple phenomenological mean-field model and Monte Carlo simulation, we investigate a collapsed macromolecular chain in poor solvent conditions under the action of a force to unwind it. We show that the macromolecule changes from the collapsed state to the stretched state via a first-order transition as the stretching force is increased. The phase diagram is calculated which consists of a first-order line with a tricritical end point. These analytical results are confirmed by Monte Carlo simulation using the bond-fluctuation model. The first-order transition is observed clearly in the data and a strong hysteresis effect is associated with the transition. Possible connections to molecular gateway and memory devices in chemical engineering are also explored.
Relation:	PHYSICA A
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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