Reaction of Methylsilanols with Hydrated Silica Surfaces: The Hydrolysis of Trichloro-, Dichloro-, and Monochloromethylsilanes and the Effects of Curing

Langmuir ◽  
1995 ◽  
Vol 11 (1) ◽  
pp. 149-155 ◽  
Author(s):  
C. P. Tripp ◽  
M. L. Hair
Keyword(s):  
Hydrated Silica ◽  
Silica Surfaces ◽  
Hydrolysis Of

Rates of alkoxylation and hydrolysis of alkoxyl groups on silica surfaces

2001 ◽  
Vol 12 (3) ◽  
pp. 343-359 ◽  
Author(s):  
Shuhei Shioji ◽  
Masashi Kawaguchi ◽  
Yasuhiro Hayashi ◽  
Kenjiro Tokami ◽  
Hideo Yamamoto
Keyword(s):  
Silica Surfaces ◽  
Hydrolysis Of

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.

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

Spectroscopic investigation of the hydrolysis of γ-glycidoxypropylsilane bound to silica surfaces

1989 ◽  
Vol 483 ◽  
pp. 209-219 ◽  
Author(s):  
G.R. Bogart ◽  
D.E. Leyden ◽  
T.M. Wade ◽  
W. Schafer ◽  
P.W. Carr
Keyword(s):  
Spectroscopic Investigation ◽  
Silica Surfaces ◽  
Hydrolysis Of

Fine Structural Localization of Acyltransferases Involved in Lipid Synthesis in Intestinal Mucosa.

1970 ◽  
Vol 28 ◽  
pp. 54-55
Author(s):  
R. J. Barrnett ◽  
J. A. Higgins
Keyword(s):  
Smooth Endoplasmic Reticulum ◽  
Lipid Synthesis ◽  
Mucosal Cell ◽  
Structural Localization ◽  
Morphological Studies ◽  
Mucosal Cells ◽  
Initial Appearance ◽  
Sh Group ◽  
Hydrolysis Of ◽  
Intestinal Mucosal Cells

The main products of intestinal hydrolysis of dietary triglycerides are free fatty acids and monoglycerides. These form micelles from which the lipids are absorbed across the mucosal cell brush border. Biochemical studies have indicated that intestinal mucosal cells possess a triglyceride synthesising system, which uses monoglyceride directly as an acylacceptor as well as the system found in other tissues in which alphaglycerophosphate is the acylacceptor. The former pathway is used preferentially for the resynthesis of triglyceride from absorbed lipid, while the latter is used mainly for phospholipid synthesis. Both lipids are incorporated into chylomicrons. Morphological studies have shown that during fat absorption there is an initial appearance of fat droplets within the cisternae of the smooth endoplasmic reticulum and that these subsequently accumulate in the golgi elements from which they are released at the lateral borders of the cell as chylomicrons.We have recently developed several methods for the fine structural localization of acyltransferases dependent on the precipitation, in an electron dense form, of CoA released during the transfer of the acyl group to an acceptor, and have now applied these methods to a study of the fine structural localization of the enzymes involved in chylomicron lipid biosynthesis. These methods are based on the reduction of ferricyanide ions by the free SH group of CoA.

Lattice imaging and pore structure of β ferric oxyhydroxide

1978 ◽  
Vol 36 (1) ◽  
pp. 264-265
Author(s):  
T. Baird ◽  
J.R. Fryer ◽  
S.T. Galbraith
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Bulk Material ◽  
Model Structure ◽  
Bulk Crystals ◽  
Lattice Imaging ◽  
Thin Sections ◽  
Ferric Oxyhydroxide ◽  
Resolution Electron ◽  
Hydrolysis Of

Introduction Previously we had suggested (l) that the striations observed in the pod shaped crystals of β FeOOH were an artefact of imaging in the electron microscope. Contrary to this adsorption measurements on bulk material had indicated the presence of some porosity and Gallagher (2) had proposed a model structure - based on the hollandite structure - showing the hollandite rods forming the sides of 30Å pores running the length of the crystal. Low resolution electron microscopy by Watson (3) on sectioned crystals embedded in methylmethacrylate had tended to support the existence of such pores.We have applied modern high resolution techniques to the bulk crystals and thin sections of them without confirming these earlier postulatesExperimental β FeOOH was prepared by room temperature hydrolysis of 0.01M solutions of FeCl3.6H2O, The precipitate was washed, dried in air, and embedded in Scandiplast resin. The sections were out on an LKB III Ultramicrotome to a thickness of about 500Å.

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