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 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

scholarly journals Synthesis of Microporous Silica Nanoparticles to Study Water Phase Transitions by Vibrational Spectroscopy

2019 ◽  
Author(s):  
daniel rosenberg ◽  
Selim Alayoglu ◽  
robert kostecki ◽  
Musahid Ahmed
Keyword(s):  
Silica Nanoparticles ◽  
Vibrational Spectroscopy ◽  
Soft Template ◽  
Outer Diameter ◽  
Hydrated Silica ◽  
Microporous Silica ◽  
Water Ice ◽  
Silica Surfaces ◽  
Molecular Scale ◽  
Reverse Microemulsion Method

Microporous silica nanoparticles have been developed by a reverse microemulsion method utilizing zinc nanoclusters encapsulated hydroxyl-terminated polyamidoamine (PAMAM-OH) dendrimers as a soft template and made tunable within the outer diameter range of 20-50 nm with a core mesopore of 2-15 nm. Synthesized nanoparticles were used to study the effects of surface area and microporous volumes on the vibrational spectroscopy of water. These spectra reveal contributions from bulk interfacial/interparticle water, ice-like surface water, liquid-like water, and hydrated silica surfaces suggesting that microporous silica nanoparticles allow a way to probe silica water interactions at the molecular scale.

scholarly journals Synthesis of Microporous Silica Nanoparticles to Study Water Phase Transitions by Vibrational Spectroscopy

2019 ◽  
Author(s):  
daniel rosenberg ◽  
Selim Alayoglu ◽  
robert kostecki ◽  
Musahid Ahmed
Keyword(s):  
Silica Nanoparticles ◽  
Vibrational Spectroscopy ◽  
Soft Template ◽  
Outer Diameter ◽  
Hydrated Silica ◽  
Microporous Silica ◽  
Water Ice ◽  
Silica Surfaces ◽  
Molecular Scale ◽  
Reverse Microemulsion Method

Microporous silica nanoparticles have been developed by a reverse microemulsion method utilizing zinc nanoclusters encapsulated hydroxyl-terminated polyamidoamine (PAMAM-OH) dendrimers as a soft template and made tunable within the outer diameter range of 20-50 nm with a core mesopore of 2-15 nm. Synthesized nanoparticles were used to study the effects of surface area and microporous volumes on the vibrational spectroscopy of water. These spectra reveal contributions from bulk interfacial/interparticle water, ice-like surface water, liquid-like water, and hydrated silica surfaces suggesting that microporous silica nanoparticles allow a way to probe silica water interactions at the molecular scale.

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.

Synthesis of Nanosized β-Wollastonite Crystals Using Hydrated Silica Gel from Serpentines

2020 ◽  
Vol 94 (10) ◽  
pp. 2103-2107
Author(s):  
A. R. Isahakyan ◽  
N. H. Zulumyan ◽  
S. A. Melikyan ◽  
H. A. Beglaryan
Keyword(s):  
Silica Gel ◽  
Hydrated Silica
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