Liquid-Solid Slip on Charged Walls: The Dramatic Impact of Charge Distribution

Xie, Yanbo; Fu, Li; Niehaus, Thomas A.; Joly, Laurent

doi:10.1103/physrevlett.125.014501

Cited by 77 publications

(122 citation statements)

References 74 publications

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“…Moreover, Schaefer et al 13 concluded that a change in surface potential could be explained by a flow-induced change of the concentration of ions that screen the surface charge. A flow-dependent surface charge not only paves the way for novel electrokinetic effects 14 , but it also has important consequences for the interpretation of zeta potential measurements. However, the mechanism by which the flow alters the surface charge is poorly understood as of yet 15 .…”

Section: Introductionmentioning

confidence: 99%

Liquid flow reversibly creates a macroscopic surface charge gradient

et al. 2021

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The charging and dissolution of mineral surfaces in contact with flowing liquids are ubiquitous in nature, as most minerals in water spontaneously acquire charge and dissolve. Mineral dissolution has been studied extensively under equilibrium conditions, even though non-equilibrium phenomena are pervasive and substantially affect the mineral-water interface. Here we demonstrate using interface-specific spectroscopy that liquid flow along a calcium fluoride surface creates a reversible spatial charge gradient, with decreasing surface charge downstream of the flow. The surface charge gradient can be quantitatively accounted for by a reaction-diffusion-advection model, which reveals that the charge gradient results from a delicate interplay between diffusion, advection, dissolution, and desorption/adsorption. The underlying mechanism is expected to be valid for a wide variety of systems, including groundwater flows in nature and microfluidic systems.

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Section: Introductionmentioning

confidence: 99%

Liquid flow reversibly creates a macroscopic surface charge gradient

et al. 2021

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“…The majority of MD studies modelled CNTs to be electrically neutral (zero partial charge) and calculated only the electrostatic interactions of water. The presence of surface charge in CNTs could significantly alter the flow behaviour of water [172][173][174]. Moreover, the applicability of the techniques [175][176][177] used to handle electrostatics in confined flow situations has yet to be examined in detail.…”

Section: (3) Water Modelsmentioning

confidence: 99%

Fast transport of water in carbon nanotubes: a review of current accomplishments and challenges

Sam

Hartkamp

Kannam

et al. 2020

Molecular Simulation

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The intriguing mass transport properties of carbon nanotubes (CNTs) have received widespread attention, especially the rapid transport of water through CNTs due to their atomically smooth wall interiors. Extensive research has been dedicated to the comprehension of various aspects of water flow in contact with CNTs, the most prominent ones being the studies on slip and flow rates. Experimental and computational studies have confirmed an enhanced water flow rate through this graphitic nanoconfinement. However, a quantitative agreement has not yet been attained. These disparities coupled with incomplete knowledge of the mechanisms of water transport at nanoscale regimes are hindering the possibilities to integrate CNTs in numerous nanofluidic applications. In the present review, we focus on the slip and flow rates of water through CNTs and the factors influencing them. We discuss the key sources of discrepancies in water flow rate and suggest directions for future study.

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“…[22][23][24][25] On the modeling side, several efforts have been pursued in order to understand the molecular mechanisms that control friction, with special interest on the discussion of the relation between the friction coefficient and the time autocorrelation of the force exerted by the liquid on the wall. [26][27][28][29][30][31][32][33] Further work has been performed to study the impact on friction of different wall features such as wettability, 34,35 roughness, 36 crystallographic orientation, 37 electronic structure, [38][39][40] or electrostatic interactions. 41 Yet a large number of questions with regard to the interface properties, such as its viscoelastic or purely viscous nature [42][43][44] or the possible link with its interfacial thermal transport equivalents via wall's wetting properties, [45][46][47] remain open nowadays, limiting the perspectives for a rational search of optimal interfaces.…”

Section: Introductionmentioning

confidence: 99%