Hydrolysis of Ethyl Silicate*

1950 ◽  
Vol 72 (12) ◽  
pp. 5705-5712 ◽  
Author(s):  
R. Aelion ◽  
A. Loebel ◽  
F. Eirich
Keyword(s):  
Ethyl Silicate ◽  
Hydrolysis Of

scholarly journals III. On the Hydrolysis of Ethyl Silicate. (3)

1953 ◽  
Vol 74 (11) ◽  
pp. 892-894
Author(s):  
Tooru Takatani
Keyword(s):  
Ethyl Silicate ◽  
Hydrolysis Of

NMR kinetic study of ethyl silicate hydrolysis by ammonia in alcoholic solvents

1992 ◽  
Vol 70 (6) ◽  
pp. 1612-1617 ◽  
Author(s):  
Idriss El Bakali ◽  
Essaïd El Rhess ◽  
Christophe Rousselot ◽  
René Mercier ◽  
Marie-France Mercier
Keyword(s):  
Kinetic Study ◽  
Rate Constant ◽  
Media Use ◽  
Ethyl Silicate ◽  
Hydrolysis Of ◽  
C Nmr

Hydrolysis of Si(OC2H5)4 by ammonia has been investigated using 1H and 13C NMR measurements in alcoholic media. Use of deuterated CD3CD2OD and CD3OD solvents proves the absence of transesterification by alkoxy exchange between silicate and alcohols. The rate constant increases when CD3OD replaces CD3CD2OD as the solvent (k = 2.8 × 10−3 L mol−1 min−1 in CD3CD2OD; 7.5 × 10−3 L mol−1 min−1 in CD3OD for similar experiments).

scholarly journals Catalytic Action of Nitric Acid on The Hydrolysis of ETS-40 Ethyl Silicate

2021 ◽  
Vol 15 (4) ◽  
pp. 475-478
Author(s):  
Iryna Lutsyuk ◽  
◽  
Yaroslav Vakhula ◽  
Iryna Tupis ◽  
Iryna Iliuchok ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Nitric Acid ◽  
Dispersion Analysis ◽  
Ethyl Silicate ◽  
Hydrolysis Rate ◽  
Maximum Temperature ◽  
Different Temperatures ◽  
Hydrolysis Of ◽  
Scanning Electron

The effect of concentrated nitric acid on the hydrolysis rate of ETS-40 ethyl silicate hasbeen studied. The duration and maximum temperature of ethyl silicate hydrolysis at different temperatures of the components have been determined. The formation of silica particles in the xerogel structure is shown. The influence of the ETS-40 hydrolysis on the particles size and concentration has been examined. The structure of the xerogel and the composition of the formed particles have been investigated using scanning electron microscopy (SEM) and energy dispersion analysis (EDX).

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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