Anomalous capillary filling and wettability reversal in nanochannels

Gravelle, Simon; Ybert, Christophe; Bocquet, Lydéric; Joly, Laurent

doi:10.1103/physreve.93.033123

Cited by 50 publications

(33 citation statements)

References 52 publications

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“…Note that reversely the independent knowledge of the permeance in this system would allow to get much insights into the capillary pressure and disjoining effects at small scales. 47 This suggests further experimental work along these lines.…”

Section: Discussionmentioning

confidence: 90%

Labyrinthine water flow across multilayer graphene-based membranes: Molecular dynamics versus continuum predictions

Yoshida

Bocquet

2016

The Journal of Chemical Physics

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In this paper, we investigate the hydrodynamic permeance of water through graphene-based membranes, inspired by recent experimental findings on graphene-oxide membranes. We consider the flow across multiple graphene layers having nanoslits in a staggered alignment, with an inter-layer distance ranging from sub-nanometer to a few nanometers. We compare results for the permeability obtained by means of molecular dynamics simulations to continuum predictions obtained by using the lattice Boltzmann calculations and hydrodynamic modelization. This highlights that, in spite of extreme confinement, the permeability across the graphene-based membrane is quantitatively predicted on the basis of a continuum expression, taking properly into account entrance and slippage effects of the confined water flow. Our predictions refute the breakdown of hydrodynamics at small scales in these membrane systems. They constitute a benchmark to which we compare published experimental data.

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Section: Discussionmentioning

confidence: 90%

Labyrinthine water flow across multilayer graphene-based membranes: Molecular dynamics versus continuum predictions

Yoshida

Bocquet

2016

The Journal of Chemical Physics

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“…Although the molecular origin of the solvation pressure is well-understood [38,42], reliable expressions for predicting its magnitude for various fluids are not available. However, Joly et al [41] have recently shown that an expression of the form…”

Section: Resultsmentioning

confidence: 99%

Solving lubrication problems at the nanometer scale

Chandramoorthy

Hadjiconstantinou

2018

Microfluid Nanofluid

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Lubrication problems at lengthscales for which the traditional Navier-Stokes description fails can be solved using a modified Reynolds lubrication equation that is based on the following two observations: first, classical Reynolds equation failure at small lengthscales is a result of the failure of the Poiseuille flowrate closure (the Reynolds equation is derived from a statement of mass conservation, which is valid at all scales); second, averaging across the film thickness eliminates the need for a constitutive relation providing spatial resolution of flow profiles in this direction. In other words, the constitutive information required to extend the classical Reynolds lubrication equation to small lengthscales is limited to knowledge of the flowrate as a function of the gap height, which is significantly less complex than a general constitutive relation, and can be obtained by experiments and/or offline molecular simulations of pressure driven flow under fully developed conditions. The proposed methodology, which is an extension of the Generalized Lubrication Equation of Fukui & Kaneko to dense fluids, is demonstrated and validated via comparison to Molecular Dynamics simulations of a model lubrication problem.

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“…Thin-film dynamics can be analysed within the lubrification approximation 27 and in the limit of low Reynolds numbers. The fluctuation interface spectrum can be obtained from the Hamiltonian H h [ ] of the height fluctuations h. The energy functional depends on the Van der Waals interactions between the surfaces, possibly the discrete properties of the confined liquid 28,29 and also contributions associated with constraints fixing the average gap size. The dynamics for small height fluctuations are given by 27…”

Section: Transport and Dispersion Across Wiggling Nanopores Sophie Mamentioning

confidence: 99%

Transport and dispersion across wiggling nanopores

2018

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The transport of fluids at the nanoscale has achieved major breakthroughs over recent years 1-4 ; however, artificial channels still cannot match the efficiency of biological porins in terms of fluxes or selectivity. Pore shape agitation-due to thermal fluctuations or in response to external stimuli-is believed to facilitate transport in biochannels 5-9 , but its impact on transport in artificial pores remains largely unexplored. Here we introduce a general theory for transport through thermally or actively fluctuating channels, which quantifies the impact of pore fluctuations on confined diffusion in terms of the spectral statistics of the channel fluctuations. Our findings demonstrate a complex interplay between transport and surface wiggling: agitation enhances diffusion via the induced fluid flow, but spatial variations in pore geometry can induce a slowing down via entropic trapping, in full agreement with molecular dynamics simulations and existing observations from the literature. Our results elucidate the impact of pore agitation in a broad range of artificial and biological porins, but also, at larger scales, in vascular motion in fungi, intestinal contractions and microfluidic surface waves. These results open up the possibility that transport across membranes can be actively tuned by external stimuli, with potential applications to nanoscale pumping, osmosis and dynamical ultrafiltration.

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Anomalous capillary filling and wettability reversal in nanochannels

Cited by 50 publications

References 52 publications

Labyrinthine water flow across multilayer graphene-based membranes: Molecular dynamics versus continuum predictions

Labyrinthine water flow across multilayer graphene-based membranes: Molecular dynamics versus continuum predictions

Solving lubrication problems at the nanometer scale

Transport and dispersion across wiggling nanopores

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