Study of distance dependence of hydrophobic force between two graphene-like walls and a signature of pressure induced structure formation in the confined water

Samanta, Tuhin and Biswas, Rajib and Banerjee, Saikat and Bagchi, Biman (2018) Study of distance dependence of hydrophobic force between two graphene-like walls and a signature of pressure induced structure formation in the confined water. In: JOURNAL OF CHEMICAL PHYSICS, 149 (4).

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Abstract

We examine the separation distance dependence of the hydrophobic force by systematically varying the distance (d) between twowalls. The hydrophobic force exhibits a distance mediated crossover from a liquid-like to a gas-like behavior at around d similar to 12 angstrom for 1 atm pressure. The distance dependence can be fitted to a bi-exponential form, with the longer distance part displaying a correlation length of 20 angstrom. In addition, the crossover is found to be accompanied by a divergent-like growth of the local relative number fluctuation of the water molecules confined between the two surfaces. Furthermore, at a fixed separation (d = 20 angstrom), we observe a pressure induced structural modification of confined water at high pressure. The confined water is found to form an ordered structure at high pressure (10 000 atm) and room temperature, in agreement with the experimental study G.Algara-Siller et al. Nature 519(7544), 443 (2015)]. Published by AIP Publishing.

Item Type:	Journal Article
Publication:	JOURNAL OF CHEMICAL PHYSICS
Publisher:	AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Additional Information:	Copy right for this article belong to AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	23 Aug 2018 16:00
Last Modified:	23 Aug 2018 16:00
URI:	http://eprints.iisc.ac.in/id/eprint/60483

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