Polarization model for poorly-organized interfacial water: Hydration forces between silica surfaces

2006 ◽  
Vol 127 (1) ◽  
pp. 29-42 ◽  
Author(s):  
Marian Manciu ◽  
Oscar Calvo ◽  
Eli Ruckenstein
Keyword(s):  
Interfacial Water ◽  
Polarization Model ◽  
Silica Surfaces ◽  
Hydration Forces

Hydration forces between silica surfaces: Experimental data and predictions from different theories

2005 ◽  
Vol 123 (3) ◽  
pp. 034708 ◽  
Author(s):  
J. J. Valle-Delgado ◽  
J. A. Molina-Bolívar ◽  
F. Galisteo-González ◽  
M. J. Gálvez-Ruiz ◽  
A. Feiler ◽  
...  
Keyword(s):  
Experimental Data ◽  
Silica Surfaces ◽  
Hydration Forces

scholarly journals Ions Tune Interfacial Water Structure and Modulate Hydrophobic Interactions at Silica Surfaces

2020 ◽  
Vol 142 (15) ◽  
pp. 6991-7000 ◽  
Author(s):  
Aashish Tuladhar ◽  
Shalaka Dewan ◽  
Simone Pezzotti ◽  
Flavio Siro Brigiano ◽  
Fabrizio Creazzo ◽  
...  
Keyword(s):  
Hydrophobic Interactions ◽  
Water Structure ◽  
Interfacial Water ◽  
Silica Surfaces ◽  
Interfacial Water Structure

Existence of Hydration Forces in the Interaction between Apoferritin Molecules Adsorbed on Silica Surfaces

Langmuir ◽  
2005 ◽  
Vol 21 (21) ◽  
pp. 9544-9554 ◽  
Author(s):  
J. J. Valle-Delgado ◽  
J. A. Molina-Bolívar ◽  
F. Galisteo-González ◽  
M. J. Gálvez-Ruiz ◽  
A. Feiler ◽  
...  
Keyword(s):  
Silica Surfaces ◽  
Hydration Forces

scholarly journals Ice-like water supports hydration forces and eases sliding friction

2016 ◽  
Vol 2 (8) ◽  
pp. e1600763 ◽  
Author(s):  
Nishad Dhopatkar ◽  
Adrian P. Defante ◽  
Ali Dhinojwala
Keyword(s):  
Sliding Friction ◽  
Water Structure ◽  
Water Layer ◽  
Bulk Water ◽  
Interfacial Water ◽  
Confined Water ◽  
Surfactant Monolayers ◽  
Sum Frequency ◽  
Charged Surfaces ◽  
Hydration Forces

The nature of interfacial water is critical in several natural processes, including the aggregation of lipids into the bilayer, protein folding, lubrication of synovial joints, and underwater gecko adhesion. The nanometer-thin water layer trapped between two surfaces has been identified to have properties that are very different from those of bulk water, but the molecular cause of such discrepancy is often undetermined. Using surface-sensitive sum frequency generation (SFG) spectroscopy, we discover a strongly coordinated water layer confined between two charged surfaces, formed by the adsorption of a cationic surfactant on the hydrophobic surfaces. By varying the adsorbed surfactant coverage and hence the surface charge density, we observe a progressively evolving water structure that minimizes the sliding friction only beyond the surfactant concentration needed for monolayer formation. At complete surfactant coverage, the strongly coordinated confined water results in hydration forces, sustains confinement and sliding pressures, and reduces dynamic friction. Observing SFG signals requires breakdown in centrosymmetry, and the SFG signal from two oppositely oriented surfactant monolayers cancels out due to symmetry. Surprisingly, we observe the SFG signal for the water confined between the two charged surfactant monolayers, suggesting that this interfacial water layer is noncentrosymmetric. The structure of molecules under confinement and its macroscopic manifestation on adhesion and friction have significance in many complicated interfacial processes prevalent in biology, chemistry, and engineering.

Influence of Hydrated Silica Surfaces on Interfacial Water in the Presence of Clathrate Hydrate Forming Gases

2012 ◽  
Vol 116 (47) ◽  
pp. 24907-24915 ◽  
Author(s):  
S. Alireza Bagherzadeh ◽  
Peter Englezos ◽  
Saman Alavi ◽  
John A. Ripmeester
Keyword(s):  
Clathrate Hydrate ◽  
Interfacial Water ◽  
Hydrated Silica ◽  
Silica Surfaces

scholarly journals Surface chemical heterogeneity modulates silica surface hydration

2018 ◽  
Vol 115 (12) ◽  
pp. 2890-2895 ◽  
Author(s):  
Alex M. Schrader ◽  
Jacob I. Monroe ◽  
Ryan Sheil ◽  
Howard A. Dobbs ◽  
Timothy J. Keller ◽  
...  
Keyword(s):  
Surface Water ◽  
Interfacial Water ◽  
Surface Forces Apparatus ◽  
Hydration Properties ◽  
Silica Surfaces ◽  
Colloidal Interactions ◽  
Chemical Treatments ◽  
Water Diffusivity ◽  
Dynamics Simulations ◽  
Connectivity Parameter

An in-depth knowledge of the interaction of water with amorphous silica is critical to fundamental studies of interfacial hydration water, as well as to industrial processes such as catalysis, nanofabrication, and chromatography. Silica has a tunable surface comprising hydrophilic silanol groups and moderately hydrophobic siloxane groups that can be interchanged through thermal and chemical treatments. Despite extensive studies of silica surfaces, the influence of surface hydrophilicity and chemical topology on the molecular properties of interfacial water is not well understood. In this work, we controllably altered the surface silanol density, and measured surface water diffusivity using Overhauser dynamic nuclear polarization (ODNP) and complementary silica–silica interaction forces across water using a surface forces apparatus (SFA). The results show that increased silanol density generally leads to slower water diffusivity and stronger silica–silica repulsion at short aqueous separations (less than ∼4 nm). Both techniques show sharp changes in hydration properties at intermediate silanol densities (2.0–2.9 nm−2). Molecular dynamics simulations of model silica–water interfaces corroborate the increase in water diffusivity with silanol density, and furthermore show that even on a smooth and crystalline surface at a fixed silanol density, adjusting the spatial distribution of silanols results in a range of surface water diffusivities spanning ∼10%. We speculate that a critical silanol cluster size or connectivity parameter could explain the sharp transition in our results, and can modulate wettability, colloidal interactions, and surface reactions, and thus is a phenomenon worth further investigation on silica and chemically heterogeneous surfaces.

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