start-ver=1.4
cd-journal=joma
no-vol=112
cd-vols=
no-issue=27
article-no=
start-page=8221
end-page=8226
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2015
dt-pub=20150707
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Solid-liquid critical behavior of water in nanopores
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Nanoconfined liquid water can transform into low-dimensional ices whose crystalline structures are dissimilar to any bulk ices and whose melting point may significantly rise with reducing the pore size, as revealed by computer simulation and confirmed by experiment. One of the intriguing, and as yet unresolved, questions concerns the observation that the liquid water may transform into a low-dimensional ice either via a first-order phase change or without any discontinuity in thermodynamic and dynamic properties, which suggests the existence of solid?liquid critical points in this class of
nanoconfined systems. Here we explore the phase behavior of a model of water in carbon nanotubes in the temperature?pressure?diameter space by molecular dynamics simulation and provide unambiguous evidence to support solid?liquid critical phenomena of nanoconfined water. Solid?liquid first-order phase boundaries are
determined by tracing spontaneous phase separation at various temperatures. All of the boundaries eventually cease to exist at the critical points and there appear loci of response function maxima, or the Widom lines, extending to the supercritical region. The finite-size scaling analysis of the density distribution supports the
presence of both first-order and continuous phase changes between solid and liquid. At around the Widom line, there are microscopic domains of two phases, and continuous solid?liquid phase changes
occur in such a way that the domains of one phase grow and those of the other evanesce as the thermodynamic state departs from the Widom line.
en-copyright=
kn-copyright=

en-aut-name=MochizukiKenji
en-aut-sei=Mochizuki
en-aut-mei=Kenji
kn-aut-name=望月建爾
kn-aut-sei=望月
kn-aut-mei=建爾
aut-affil-num=1
ORCID=

en-aut-name=KogaKenichiro
en-aut-sei=Koga
en-aut-mei=Kenichiro
kn-aut-name=甲賀研一郎
kn-aut-sei=甲賀
kn-aut-mei=研一郎
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学大学院自然科学研究科

affil-num=2
en-affil=
kn-affil=岡山大学大学院自然科学研究科
en-keyword=water
kn-keyword=water
en-keyword=solid?liquid critical point
kn-keyword=solid?liquid critical point
en-keyword=carbon nanotube
kn-keyword=carbon nanotube
en-keyword=ice
kn-keyword=ice
en-keyword=Widom line
kn-keyword=Widom line
END