Shear Response of Nanoconfined Water on Muscovite Mica: Role of Cations

Ulčinas, Artūras; Valdrè, Giovanni; Snitka, Valentinas; Miles, Mervyn J; Claesson, Per M.; Antognozzi, Massimo

doi:10.1021/la2021897

Cited by 32 publications

(35 citation statements)

References 20 publications

(36 reference statements)

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“…Newer data on a similar system but with a different technique (lateral molecular force microscopy) analysing power spectra (0.5–7 kHz) from a thermally activated signal (Ulcinas et al . ) to a large extent confirm Raviv and Klein's findings. In addition, at sub‐nanometer distances, viscosity enhancement and evidence of shear rigidity was found.…”

Section: What Is Known About Water Near Clay Mineral Surfaces?supporting

confidence: 87%

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How does water near clay mineral surfaces influence the rock physics of shales?

Holt

Kolstø

2017

Geophysical Prospecting

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Clays and clay‐bearing rocks like shale are extremely water sensitive. This is partly due to the interaction between water and mineral surfaces, strengthened by the presence of nanometer‐size pores and related large specific surface areas. Molecular‐scale numerical simulations, using a discrete‐element model, show that shear rigidity can be associated with structurally ordered (bound or adsorbed) water near charged surfaces. Building on these and other molecular dynamics simulations plus nanoscale experiments from the literature, the water monolayer adjacent to hydrophilic solid surfaces appears to be characterised by shear stiffness and/or enhanced viscosity. In both cases, elastic wave propagation will be affected by the bound or adsorbed water. Using a simple rock physics model, bound water properties were adjusted to match laboratory measured P‐ and S‐wave velocities on pure water‐saturated kaolinite and smectite. To fit the measured stress sensitivity, particularly for kaolinite, the contribution from solid‐grain contact stiffness needs to be added. The model predicts, particularly for S‐waves, that viscoelastic bound water could be a source of dispersion in clay and clay‐rich rocks. The bound‐water‐based rock physics model is found to represent a lower bound to laboratory‐measured velocities obtained with shales of different mineralogy and porosity levels.

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Section: What Is Known About Water Near Clay Mineral Surfaces?supporting

confidence: 87%

“…; Ulcinas et al . ), there is evidence for strongly enhanced viscosity (10 6 –10 7 times that of bulk water) at distances of about 1 nm from a solid surface. Some experiments (Raviv and Klein ) show low viscosity but high normal forces, still indicating bound‐water behaviour.…”

Section: Discussionmentioning

confidence: 93%

How does water near clay mineral surfaces influence the rock physics of shales?

Holt

Kolstø

2017

Geophysical Prospecting

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“…Numerous studies 2,6,7,[12][13][14][15]17,[20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] have examined the behaviour of nano-confined aqueous solutions in various systems and under different circumstances. Experimentally, the two main approaches are based on the surface force apparatus (SFA) and atomic force microscopy (AFM) with each family of methods offering different modes of operation.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, both techniques have been used to investigate the effects of dissolved metal ions on the behaviour of nano-confined water. 31,32,39,42,[48][49][50] SFB studies indicate that ultrapure water remains mostly fluid even when confined to gaps <3.5 nm, resulting in a 3-5 fold increase in viscosity. 22,28,42,49 This result is supported by some theoretical studies, 51,52 and explained by a fast rotational and translational dynamics of water molecules under extreme confinement.…”

Section: Introductionmentioning

confidence: 99%

Lubricating properties of single metal ions at interfaces

Cafolla

Voïtchovsky

2018

Nanoscale

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The behaviour of ionic solutions confined in nanoscale gaps is central to countless processes, from biomolecular function to electrochemistry, energy storage and lubrication. However, no clear link exists between the molecular-level behaviour of the liquid and macroscopic observations. The problem mainly comes from the difficulty to interrogate a small number of liquid molecules. Here, we use atomic force microscopy to investigate the viscoelastic behaviour of pure water and ionic solutions down to the single ion level. The results show a glassy-like behaviour for pure water, with single metal ions acting as lubricants by reducing the elasticity of the nano-confined solution and the magnitude of the hydrodynamic friction. At small ionic concentration (<20 mM) the results can be quantitatively explained by the ions moving via a thermally-activated process resisted by the ion's hydration water (Prandtl-Tomlinson model). The model breaks down at higher salt concentrations due to ion-ion interaction effects that can no longer be neglected. The correlations are confirmed by direct sub-nanometre imaging of the interface at equilibrium. The results provide a molecular-level basis for explaining the tribological properties of aqueous solutions and suggest that ion-ion interactions create mesoscale effects that prevent a direct link between nanoscale and macroscopic measurements.

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“…In contrast, dynamic AFM allows for a more complete characterization of the conservative forces and the dissipation including in particular film thicknesses corresponding to non-integer numbers of molecular layers. Notwithstanding early controversies [14][15][16], there is a growing consensus that the dissipation experienced in lubricated single-asperity nano-contacts varies in a non-monotonic manner as a function of the thickness of the confined liquid film: Qualitatively similar behavior was observed for a variety of liquids including the simple Lennard-Jones liquid Octamethylcyclotetrasiloxane (OMCTS) [17][18][19], dodecanol [20], and water [21] (also depending on the ion concentration [22]). Although, chemical details are known to qualitatively alter the friction forces [23,24], this similarity in observations using a large variety of liquids with rather disparate molecular properties and solid-liquid interactions [25] suggests the presence of a generic underlying principle.…”

Section: Introductionmentioning

confidence: 95%

Can Confinement-Induced Variations in the Viscous Dissipation be Measured?

et al. 2012

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Liquids confined to molecular scales become anisotropic and often show pronounced self-organization such as layering. Although this effect is well accepted, it is still debated if confinement induces measurable changes of viscous friction. We use molecular dynamics to address this issue by simulating a Lennard-Jones liquid confined between a solid cylinder and an atomically smooth surface. The simulations reproduce the well-established variations of normal force, density, and diffusivity with the distance between wall and cylinder. We find high diffusivity and low density when the numbers of layers is in between integers. This observation seems to contradict most experimental results on the effective damping between atomic force microscope tips and substrates when interpreting them within continuum hydrodynamics used to connect liquid viscosity and diffusivity. This contradiction is resolved by directly extracting the damping that the tip experiences, which we achieve by using the fluctuationdissipation theorem; as in experiment, we find local minima in the damping near integer numbers of molecular layers and maxima in between. These variations correlate with distinct structural changes in the microscopic order of the fluid. We reconfirm that constitutive equations valid at macroscopic scales cannot be used to interpret confined liquids and finally conclude that viscous friction displays measurable, non-monotonic behavior with the degree of confinement.

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Shear Response of Nanoconfined Water on Muscovite Mica: Role of Cations

Cited by 32 publications

References 20 publications

How does water near clay mineral surfaces influence the rock physics of shales?

How does water near clay mineral surfaces influence the rock physics of shales?

Lubricating properties of single metal ions at interfaces

Can Confinement-Induced Variations in the Viscous Dissipation be Measured?

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