A Novel Method of Synthesis of Nanostructured Aluminum Nitride Through Sol-Gel Route by In Situ Generation of Nitrogen

2013 ◽  
Vol 96 (2) ◽  
pp. 385-390 ◽  
Author(s):  
M. Ghosh Chaudhuri ◽  
J. Basu ◽  
G. C. Das ◽  
S. Mukherjee ◽  
M. K. Mitra
Keyword(s):  
Aluminum Nitride ◽  
Sol Gel ◽  
Novel Method ◽  
In Situ Generation

A Novel Method for the In situ Generation of Alkoxydialkylboranes and Their Use in the Selective Preparation of 1,3-synDiols

1987 ◽  
Vol 16 (10) ◽  
pp. 1923-1926 ◽  
Author(s):  
Kau-Ming Chen ◽  
Karl G. Gunderson ◽  
Goetz E. Hardtmann ◽  
Kapa Prasad ◽  
Oljan Repic ◽  
...  
Keyword(s):  
Novel Method ◽  
In Situ Generation

ChemInform Abstract: A Novel Method for the In Situ Generation of Alkoxydialkylboranes and Their Use in the Selective Preparation of 1,3-Syn Diols.

ChemInform ◽  
1988 ◽  
Vol 19 (16) ◽  
Author(s):  
K.-M. CHEN ◽  
K. G. GUNDERSON ◽  
G. E. HARDTMANN ◽  
K. PRASAD ◽  
O. REPIC ◽  
...  
Keyword(s):  
Novel Method ◽  
In Situ Generation

Preparation and Properties of PVC-Silica Composites using Different Catalysts Via Sol-Gel Process

1999 ◽  
Vol 576 ◽  
Author(s):  
Khan M. Asif ◽  
M.I. Sarwar ◽  
Z. Ahmad
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Sol Gel ◽  
Silica Network ◽  
Transparent Films ◽  
Sol Gel Process ◽  
Gel Technique ◽  
In Situ Generation ◽  
Scanning Electron

Novel micro-composites from Polyvinyl chloride (PVC) and silica were prepared using sol-gel technique. Different catalysts were used for the in-situ generation of silica network from tetraethylorthosilicate (TEOS) in the PVC matrix. Thin transparent films containing various proportions of silica in PVC were cast by the solvent elution technique. Mechanical properties of these films were studied. The results showed an increase in the value of Young's modulus and strain at rupture by the addition of small amount of silica in PVC. However, the stress at yields point and stress at rupture decreased with the addition of silica contents. Scanning electron microscopy (SEM-EDAX) studies were also performed on these samples.

Syntheses and Characterisation of Gd3Al5O12 and La3Al5O12 Garnets

2007 ◽  
Vol 72 (3) ◽  
pp. 321-333 ◽  
Author(s):  
Edita Garskaite ◽  
Natalija Dubnikova ◽  
Arturas Katelnikovas ◽  
Jiří Pinkas ◽  
Aivaras Kareiva
Keyword(s):  
Phase Composition ◽  
Ir Spectroscopy ◽  
Metal Ions ◽  
Sol Gel ◽  
Aqueous Media ◽  
Experimental Conditions ◽  
Lanthanide Ion ◽  
In Situ Generation ◽  
Xrd Patterns

A sol-gel method based on in situ generation of mixed-metal chelates by complexing metal ions with ethane-1,2-diol in aqueous media has been elaborated to prepare lanthanide-ion containing garnets, Gd3Al5O12 (GAG) and La3Al5O12 (LAG). XRD patterns of the powders sintered at 1 000 °C revealed the formation of monophasic GAG. However, LAG does not form under the same experimental conditions. The phase composition of the samples was characterised by IR spectroscopy. Microstructural features of the polycrystalline garnets were studied by SEM.

Facile, shear-induced, rapid formation of stable gels of chitosan through in situ generation of colloidal metal salts

2018 ◽  
Vol 54 (82) ◽  
pp. 11582-11585 ◽  
Author(s):  
Kartik Ravishankar ◽  
Hemalatha Kanniyappan ◽  
K. M. Shelly ◽  
Vignesh Muthuvijayan ◽  
Raghavachari Dhamodharan
Keyword(s):  
Metal Ions ◽  
Metal Salts ◽  
Rapid Formation ◽  
Novel Method ◽  
In Situ Generation ◽  
Colloidal Metal

A novel method of preparing chitosan gels using in situ generated negatively-charged colloidal salts of a variety of metal ions is described.

In-Situ Study of NiO Growth on Textured Nickel Tape Using Environmental Scanning Electron Microscope (ESEM) and Hot Stage

2001 ◽  
Vol 7 (S2) ◽  
pp. 1276-1277
Author(s):  
Y. Akin ◽  
R.E. Goddard ◽  
W. Sigmund ◽  
Y.S. Hascicek
Keyword(s):  
Buffer Layer ◽  
Lattice Mismatch ◽  
Sol Gel ◽  
Surface Oxidation ◽  
Dip Coating ◽  
Buffer Layers ◽  
Superconducting Film ◽  
Environmental Scanning ◽  
Cold Rolling And Annealing

Deposition of highly textured ReBa2Cu3O7−δ (RBCO) films on metallic substrates requires a buffer layer to prevent chemical reactions, reduce lattice mismatch between metallic substrate and superconducting film layer, and to prevent diffusion of metal atoms into the superconductor film. Nickel tapes are bi-axially textured by cold rolling and annealing at appropriate temperature (RABiTS) for epitaxial growth of YBa2Cu3O7−δ (YBCO) films. As buffer layers, several oxide thin films and then YBCO were coated on bi-axially textured nickel tapes by dip coating sol-gel process. Biaxially oriented NiO on the cube-textured nickel tape by a process named Surface-Oxidation- Epitaxy (SEO) has been introduced as an alternative buffer layer. in this work we have studied in situ growth of nickel oxide by ESEM and hot stage.Representative cold rolled nickel tape (99.999%) was annealed in an electric furnace under 4% hydrogen-96% argon gas mixture at 1050°C to get bi-axially textured nickel tape.

Highly diastereo- and enantioselective organocatalytic synthesis of trifluoromethylated erythritols based on the in situ generation of unstable trifluoroacetaldehyde

2021 ◽  
Author(s):  
Kazumasa Funabiki ◽  
Toshiya Gotoh ◽  
Ryunosuke Kani ◽  
Toshiyasu Inuzuka ◽  
Yasuhiro Kubota
Keyword(s):  
Trifluoromethyl Group ◽  
In Situ Generation

A highly diastereo- and enantioselective organocatalytic method to synthesise erythritols bearing a trifluoromethyl group has been investigated.

Recent advances in Minisci-type reactions and applications in organic synthesis

2020 ◽  
Vol 24 ◽  
Author(s):  
Wengui Wang ◽  
Shoufeng Wang
Keyword(s):  
Free Radical ◽  
Hydrogen Atom ◽  
Organic Synthesis ◽  
Radical Reactivity ◽  
Atom Loss ◽  
Radical Generation ◽  
In Situ Generation ◽  
Thermal Cleavage ◽  
Synthetic Chemist

Abstract:: Minisci-type reactions have become widely known as reactions that involve the addition of carbon-centered radicals to basic heteroarenes followed by formal hydrogen atom loss. While the originally developed protocols for radical generation remain in active use today, in recent years by a new array of radical generation strategies allow use of a wider variety of radical precursors that often operate under milder and more benign conditions. New transformations based on free radical reactivity are now available to a synthetic chemist looking to utilize a Minisci-type reaction. Radical-generation methods based on photoredox catalysis and electrochemistry, which utilize thermal cleavage or the in situ generation of reactive radical precursors, have become popular approaches. Our review will cover the remarkably literature that has appeared on this topic in recent 5 years, from 2015-01 to 2020-01, in an attempt to provide guidance to the synthetic chemist, on both the challenges that have been overcome and applications in organic synthesis.

Sign in / Sign up

Export Citation Format

Share Document