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Coexistence of Multilayered Phases of Confined Water: The Importance of Flexible Confining Surfaces

Journal Article · · ACS Nano
 [1];  [2];  [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Flexible nanoscale confinement is critical to understanding the role that bending fluctuations play on biological processes where soft interfaces are ubiquitous or to exploit confinement effects in engineered systems where inherently flexible 2D materials are pervasively employed. Here, using molecular dynamics simulations, we compare the phase behavior of water confined between flexible and rigid graphene sheets as a function of the in-plane density, ρ2D. We find that both cases show commensurate mono-, bi-, and trilayered states; however, the water phase in those states and the transitions between them are qualitatively different for the rigid and flexible cases. The rigid systems exhibit discontinuous transitions between an (n)-layer and an (n+1)-layer state at particular values of ρ2D, whereas under flexible confinement, the graphene sheets bend to accommodate an (n)-layer and an (n+1)-layer state coexisting in equilibrium at the same density. We show that the flexible walls introduce a very different sequence of ice phases and their phase coexistence with vapor and liquid phases than that observed with rigid walls. We discuss the applicability of these results to real experimental systems to shed light on the role of flexible confinement and its interplay with commensurability effects.
Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1532296
Journal Information:
ACS Nano, Journal Name: ACS Nano Journal Issue: 1 Vol. 12; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

In Silico Design and Characterization of Graphene Oxide Membranes with Variable Water Content and Flake Oxygen Content journal February 2019
Strategy on Persisting in Distinct Activity of Plasmon-Activated Water journal December 2019
Network Topology in Water Nanoconfined between Phospholipid Membranes text January 2021
Computational optimization of electric fields for better catalysis design journal September 2018
A single but hydrogen-bonded water molecule confined in an anisotropic subnanospace journal January 2018
Assembly of peptides in mica–graphene nanocapillaries controlled by confined water journal January 2019
Structure of water confined between two parallel graphene plates journal March 2019

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