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DTSTAMP:20261027T132851Z
LAST-MODIFIED:20170207T150252Z
DTSTART:20170210T171500Z
DTEND:20170210T181500Z
UID:event1719@bu.edu
URL:http://physics.bu.edu/internal/events/show/1719
SUMMARY:Peculiar Thermodynamics of Liquid Polyamorphism
DESCRIPTION:Featuring Prof. M. A. Anisimov\, Univ. of Maryland\nHosted by: 
	H. Eugene Stanley\n\nPart of the Biophysics/Condensed Matter Seminar Series
	.\n\n"Liquid polyamorphism" is the existence of two alternative amorphous s
	tructures in a\nsingle-component liquid. Liquid polyamorphism is found or p
	redicted in a broad group\nof materials\, such as triphenyl phosphite\, pho
	sphorus\, sulfur\, cerium\, germanium\,\nsilicon\, silicon dioxide\, and hy
	drogen\, usually at extreme conditions. In particular\, this\nphenomenon is
	 hypothesized in metastable\, deeply supercooled water. Structure of\nsuper
	cooled water is supposed to exhibit two forms\, a low-density liquid or a h
	igh-density\nliquid. The existence of these two alternative structures coul
	d\, at certain conditions\, result\nin metastable liquid-liquid separation 
	in pure water. In this presentation a\nphenomenological approach\, based on
	 a "chemical reaction" between two alternative\namorphous strictures\, is f
	ormulated to quantitatively describe the phenomenon of liquid\npolyamorphis
	m. The first fundamental question to be addressed is the peculiar interplay
	\nbetween thermodynamics and kinetics: a system with two inter-convertible 
	fluid structures\ncan be viewed as a single-component fluid if the time of 
	observation is much longer than\nthe time of conversion. In the opposite li
	mit (slow conversion) the system can\nthermodynamically be treated as a two
	-component fluid mixture. An equation of state\nwith a thermodynamic constr
	ain imposed by "chemical- reaction" equilibrium between\ntwo inter-converti
	ble fluid structures generically describes\, within the same model\, all th
	e\npossible fluid phases (e.g. vapor and two liquids)\, stability limits\, 
	and thermodynamic\nanomalies. The results are compared with the behavior of
	 p o p u l a r atomistic waterlike\nmodels.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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