The effect of boundary slippage and nonlinear rheological response on flow of nanoconfined water

Sekhon, Amandeep; Ajith, V J; Patil, Shivprasad

doi:10.1088/1361-648x/aa682c

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…The interstitial plane also corresponds to a weaker section of mica crystal and hence corresponds to the cleavage (001) plane of muscovite mica. Due to the ease of mica surface cleaving, it is used widely as a representative hydrophilic surface in atomic microscopy, 46 surface force apparatus, 47 surface reflectivity studies, 48 and a variety of adsorption studies. 36,39,49,50 A detailed description of creating the mica surface for MC simulations is given in previous works, 26,44,52 which we describe here in brief.…”

Section: ■ Simulation Detailsmentioning

confidence: 99%

Role of Mono- and Divalent Surface Cations on the Structure and Adsorption Behavior of Water on Mica Surface

et al. 2018

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Understanding solid–water(vapor) interfacial systems is relevant for both industrial and academic scenarios for their presence in wide areas ranging from tribology to geochemistry. Using grand canonical Monte Carlo simulations, we have investigated the role of monovalent (lithium, Li+; sodium, Na+; and potassium, K+) and divalent (magnesium, Mg2+; calcium, Ca2+) cations on the structure and adsorption behavior of water on mica surface. The water density adjacent to the surface exhibits (a) oscillations due to hydration of surface cations (interfacial layer), (b) followed by a thick liquidlike layer. The thickness of the interfacial layer is strongly dependent on the hydration shell size and hydration energy of surface ions. Water molecules immediately next to the surface (contact layers) adsorb on ditrigonal (hexagonal) cavities of mica surface and form an ordered structure. The Li+, Na+, Mg2+, and Ca2+ surface ions are coadsorbed with water molecules on the ditrigonal cavities due to their smaller hydration shell. Majority of water molecules in the second contact layer hydrate the surface ions and, together with the rest of the water molecules, form hydrogen bonds among themselves. The structure of the water molecules in the third and subsequent layer is random and more bulk liquidlike, except those molecules that hydrate the surface ions. The adsorption isotherm of water on all ion-exposed mica surface exhibits three regimes: (a) an initial rapid increase in water loading for relative vapor pressure (p/p 0) ≤0.2 due to hydration of surface ions; (b) followed by a linear increase between p/p 0 = 0.2 and 0.7, where the hydrogen bond formation between the water molecules of the interfacial layer occurs; and (c) exponential growth beyond p/p 0 = 0.7 due to thickening of the liquidlike layer. The water loading on divalent-ion-exposed mica surface is higher compared to the monovalent ions case. Although the divalent ions have higher hydration energy, the fraction of water molecules hydrating the surface ions is less compared to nonhydrating water molecules. We found that ion hydration energy and size of hydration shell play a crucial role in their structure adjacent to mica surface. At lower water loadings, the surface ions form a hydration shell with surface bridging oxygens, whereas at higher water content, the hydration preference is shifted toward mobile water molecules. The detailed understanding obtained from this work will be useful in identifying the role of ions in cloud formation, nanotribological studies, and activities of biological molecules and catalysts.

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Section: ■ Simulation Detailsmentioning

confidence: 99%

Role of Mono- and Divalent Surface Cations on the Structure and Adsorption Behavior of Water on Mica Surface

et al. 2018

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“…The small-amplitude AFM measurements of both water and OMCTS layers under confinement have revealed a speed dependant dynamic solidification 17,18 . The lipidic cubic phases provides a versatile porous media to investigate the transport of molecules through the confined water [19][20][21] .More recently, it is argued that contradiction among different experimental reports stem from working with different experimental parameters such as shear frequency, shear rates and wettability of confining walls 11,22 .…”

Section: Introductionmentioning

confidence: 99%

A new method for measurement and quantification of tracer diffusion in nanoconfined liquids

Ajith

Patil

2020

Review of Scientific Instruments

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We report development of a novel instrument to measure tracer diffusion in water under nano-scale confinement. A direct optical access to the confinement region, where water is confined between a tapered fiber and a flat substrate, is made possible by coating the probe with metal and opening a small aperture( 0.1 µm to 1 µm) at its end. A well-controlled cut using an ion beam ensures desired lateral confinement area as well as adequate illumination of the confinement gap. The probe is mounted on a tuning-fork based force sensor to control the separation between the probe and the substrate with nm precision. Fluctuations in fluorescence intensity due to diffusion of a dye molecule in water confined between probe and the sample are recorded using a confocal arrangement with a single photon precision. A Monte-Carlo method is developed to determine the diffusion coefficient from the measured autocorrelation of intensity fluctuations which accommodates the specific geometry of confinement and the illumination profile. The instrument allows measurement of diffusion laws under confinement. We found that the diffusion of a tracer molecule is slowed down by more than ten times for the probe-substrate separations of 5 nm and below.

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“…The effect of viscosity on liquids flowing under nanoconfinement is widely discussed in the literature. − Transition from viscous to elastic behavior was demonstrated when the thickness decreases below three to four molecular layers . Shear thinning for monolayer and bilayer water was reported .…”

Section: Introductionmentioning

confidence: 99%

“…93 The increased and viscosity-independent flow rates were reported through carbon nanotube membrane, hydrophobicity being mainly responsible for the observed effects. 94 In ref 95, it was argued that the increased flow rates are not only due to water slip effect on a hydrophobic surface but also due to shear thinning.…”

Section: Introductionmentioning

confidence: 99%

Viscosity at the Nanoscale: Confined Liquid Dynamics and Thermal Effects in Self-Recovering Nanobumpers

et al. 2018

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Understanding the effect of liquid viscosity in nanoconfinement is of paramount importance from both the fundamental and practical points of view. In particular, unexpected dynamic phenomena are ubiquitous in a broad range of nanofluidic applications. In this work, we used state-of-the-art high-pressure (P,V,T) calorimetry for direct observation of pressure, volume, temperature, and thermal effects during controlled intrusion/extrusion of liquids in nanoporous materials. It was discovered that the liquid extrusion pressure and the accompanying thermal effects can be controlled by changing solely the liquid viscosity. Such knowledge allowed us to propose the {nanoporous material + nonwetting liquid} system as a self-recovering nanobumper and to clarify the parameters for its optimization. Experimental results were interpreted in terms of confined classical nucleation theory as the slowdown of bubble expansion in the nanopores because of the high liquid viscosity. The present results are of practical value for designing energy storage/dissipation devices based on intrusion/extrusion cycles, as well as of fundamental importance for understanding the effect of viscosity in nanoconfined liquids.

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The effect of boundary slippage and nonlinear rheological response on flow of nanoconfined water

Cited by 4 publications

References 33 publications

Role of Mono- and Divalent Surface Cations on the Structure and Adsorption Behavior of Water on Mica Surface

Role of Mono- and Divalent Surface Cations on the Structure and Adsorption Behavior of Water on Mica Surface

A new method for measurement and quantification of tracer diffusion in nanoconfined liquids

Viscosity at the Nanoscale: Confined Liquid Dynamics and Thermal Effects in Self-Recovering Nanobumpers

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