Metastable Vapor in a Janus Nanoconfinement
Journal Article
·
· Journal of Physical Chemistry. C
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
We study the competition between liquid and vapor states of water confined between diametrically different surfaces, one hydrophilic and the other strongly hydrophobic (Janus interface). Using atomistic simulations and a generalization of the capillarity approximation, we demonstrate that vapor bubbles can persist in the confinement in long-lived metastable states. In contrast to the well-known metastability of confined liquid with respect to capillary evaporation, a strongly metastable vapor phase has so far not been anticipated, as infiltration does not involve the formation of new liquid–vapor interfaces. In the case of a Janus interface, however, we show that the interfacial free energy passes through a pronounced maximum during infiltration. This counterintuitive phenomenon provides a new mechanism for water-mediated attraction (capillary force) between polar and nonpolar surfaces in biophysical systems and in dispersions of heterogeneous nanoparticles.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Virginia Commonwealth Univ., Richmond, VA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-05CH11231; SC0004406
- OSTI ID:
- 1480468
- Alternate ID(s):
- OSTI ID: 1525960
- Journal Information:
- Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 24 Vol. 121; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Communication: Relationship between local structure and the stability of water in hydrophobic confinement
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journal | December 2017 |
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