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Role of density modulation in the spatially resolved dynamics of strongly confined liquids

Saw, Shibu and Dasgupta, Chandan (2016) Role of density modulation in the spatially resolved dynamics of strongly confined liquids. In: JOURNAL OF CHEMICAL PHYSICS, 145 (5).

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Official URL: http://dx.doi.org/10.1063/1.4959942


Confinement by walls usually produces a strong modulation in the density of dense liquids near the walls. Using molecular dynamics simulations, we examine the effects of the density modulation on the spatially resolved dynamics of a liquid confined between two parallel walls, using a resolution of a fraction of the interparticle distance in the liquid. The local dynamics is quantified by the relaxation time associated with the temporal autocorrelation function of the local density. We find that this local relaxation time varies in phase with the density modulation. The amplitude of the spatial modulation of the relaxation time can be quite large, depending on the characteristics of the wall and thermodynamic parameters of the liquid. To disentangle the effects of confinement and density modulation on the spatially resolved dynamics, we compare the dynamics of a confined liquid with that of an unconfined one in which a similar density modulation is induced by an external potential. We find several differences indicating that density modulation alone cannot account for all the features seen in the spatially resolved dynamics of confined liquids. We also examine how the dynamics near a wall depends on the separation between the two walls and show that the features seen in our simulations persist in the limit of large wall separation. Published by AIP Publishing.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 22 Oct 2016 09:22
Last Modified: 22 Oct 2016 09:22
URI: http://eprints.iisc.ac.in/id/eprint/55022

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