Structure and properties of water film adsorbed on mica surfaces

Zhao, Gutian; Tan, Qiulin; Li, Xiang; Cai, Di; Zeng, Hongbo; Hong, Yuling; Zhang, Ni; Chen, Yunfei

doi:10.1063/1.4930274

Cited by 37 publications

(31 citation statements)

References 37 publications

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“…The skin viscosity increases from 0.007 to 0.019 ×10 -2 mN·s/m 2 , agreeing with the trend of measurements [6]. Theoretical reproduction of the stress thermal decay of water skin, derived the DL = 192 K and the EL = 0.095 eV [101,47].…”

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confidence: 75%

Rules essential for water molecular undercoordination*

Sun

2020

Chinese Phys. B

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A sequential of concepts developed in last decade has enabled a resolution to multiple anomalies of water ice and its low-dimensionality, particularly. Developed concepts include the coupled hydrogen bond (O:H−O) oscillator pair, segmental specific heat, three-body coupling potentials, quasisolidity, and supersolidity. Resolved anomalies include ice buoyancy, ice slipperiness, water skin toughness, supercooling and superheating at the nanoscale, etc. Evidence shows consistently that molecular undercoordination shortens the H−O bond and stiffens its phonon while undercoordination does the O:H nonbond contrastingly associated with strong lone pair ":" polarization, which endows the lowdimensional water ice with supersolidity. The supersolid phase is hydrophobic, less dense, viscoelastic, thermally more diffusive and stable, having longer electron and phonon lifetime. The equal number of lone pairs and protons reserves the configuration and orientation of the coupled O:H−O bonds and restricts molecular rotation and proton hopping, which entitles water the simplest, ordered, tetrahedrally-coordinated, fluctuating molecular crystal covered with a supersolid skin. The O:H−O segmental cooperativity and specific-heat disparity form the soul dictating the extraordinary adaptivity, reactivity, recoverability, sensitivity of water ice when subjecting to physical perturbation.It is recommended that the premise of "hydrogen bonding and electronic dynamics" would deepen the insight into the core physics and chemistry of water ice.

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supporting

confidence: 75%

Rules essential for water molecular undercoordination*

Sun

2020

Chinese Phys. B

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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%

“…22,28,31,33,[38][39][40][41] The distance between the confining surfaces can be measured in an absolute manner using interferometry, and dynamical measurements of the viscoelastic properties of confined aqueous solutions are possible over a range of frequencies (typically 1-3 Hz) using surface force balances (SFB), 42 or SFA with resonance detection. 33,38,40,41 In contrast, AFM-based methods probe a small number of liquid molecules, typically located between a nanometre sharp tip and an atomically surface. 2,43,44 The exact confinement geometry is less well controlled, unless the tip radius is artificially increased.…”

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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“…Zhao and co-workers [89] developed a surface force apparatus to detect the skin rigidity of the monolayer skin of the adsorbed water film on a mica surface under conditions with different degrees of relative humidity. They confirmed that the first layer of the adsorbed water film is ice-like, including a lattice constant similar with ice crystal, a high bearing capacity that can support normal pressure as high as 4 MPa, a creep behavior under the action of even a small normal load, and a character of hydrogen bond.…”

Section: Supersolid Skin Rigiditymentioning

confidence: 99%

“…Fig. 10.13 The force-distance relation for two mica sheets brought together at 298 K. Thin water films formed on each mica substrate by adsorption under 80 % relative humidity for 10 h. The repulsive force increases in two steps (inset) and it reaches a maximum of 2400 mN/m (4.0 MPa) at a separation of 7.3 Å (Reprinted with permission from [89].) Therefore, the experimental results confirmed that the high rigidity of the adsorbed water film exhibiting the supersolid nature-solid-like properties including low flow ability, water insolubility, high carrying capacity in normal direction (more than 4 MPa), and the low mass density, smaller size and larger separation of molecules.…”

Section: Supersolid Skin Rigiditymentioning

confidence: 99%

Water Supersolid Skin

Sun

2016

Springer Series in Chemical Physics

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Skin molecular undercoordination not only disperses the quasisolid phase boundary but also derives supersolidity that is hydrophobic, less dense, viscoelastic, repulsive, and thermally stable.• The supersolidity and quasisolidity defines the anomalies of water skin when interact with other objects. • The skin supersolidity increases with its curvature but drops when heated due to depolarization. • Electrostatic repulsivity and elasticity claims the superhydrophobicity, superfluidity, superlubricity, and supersolidity at the contacting interface.Abstract Consistency in experimental observations, numerical calculations, and theoretical predictions revealed that skins of 25°C water and −(15-20)°C ice share the same attribute of supersolidity characterized by the identical H-O vibration frequency of 3450 cm −1 . Molecular undercoordination and inter-electron-pair repulsion shortens the H-O bond and lengthen the O:H nonbond, leading to a dual process of nonbonding electron polarization. This relaxation-polarization process enhances the dipole moment, elasticity, viscosity, thermal stability of these skins with 25 % density loss, which is responsible for the hydrophobicity and toughness of water skin and the superfluidity in a microchannel.

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Structure and properties of water film adsorbed on mica surfaces

Cited by 37 publications

References 37 publications

Rules essential for water molecular undercoordination*

Rules essential for water molecular undercoordination*

Lubricating properties of single metal ions at interfaces

Water Supersolid Skin

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