Unstable radiation colour centres in pure silica fibres: the nature and properties

1994 ◽  
Author(s):  
Eugeni M. Dianov ◽  
L. S. Kornienko ◽  
Alexey O. Rybaltovski ◽  
Pavel V. Chernov
Keyword(s):  
Colour Centres ◽  
Pure Silica ◽  
Radiation Colour

Palladium confined in pure-silica TON zeolite for furfuryl alcohol hydrogenation into tetrahydrofurfuryl alcohol

2021 ◽  
pp. 111161
Author(s):  
Jingmin Lan ◽  
Peiwen Liu ◽  
Ping Fu ◽  
Xiaoling Liu ◽  
Menglin Xie ◽  
...  
Keyword(s):  
Furfuryl Alcohol ◽  
Pure Silica

Micro-Ribbons and Micro-Wires Silica Synthesis Using Bottom-Top Technique

2020 ◽  
Vol 1008 ◽  
pp. 33-38
Author(s):  
Marwa Nabil ◽  
Hussien A. Motaweh
Keyword(s):  
Selection Process ◽  
Chemical Properties ◽  
Industrial Applications ◽  
Preparation Process ◽  
Pure Silica ◽  
One Step ◽  
Materials Used ◽  
Sonication Technique ◽  
Silica Synthesis ◽  
Physical And Chemical

Silica is one of the most important materials used in many industries. The basic factor on which the selection process depends is the structural form, which is dependent on the various physical and chemical properties. One of the common methods in preparing pure silica is that it needs more than one stage to ensure the preparation process completion. The goal of this research is studying the nucleation technique (Bottom-top) for micro-wires and micro-ribbons silica synthesis. The silica nanoand microstructures are prepared using a duality (one step); a combination of alkali chemical etching process {potassium hydroxide (3 wt %) and n-propanol (30 Vol %)} and the ultra-sonication technique. In addition, the used materials in the preparation process are environmentally friendly materials that produce no harmful residues. The powder product is characterized using XRD, FTIR, Raman spectrum and SEM for determining the shape of architectures. The most significant factor of the nucleation mechanism is the sonication time of silica powder production during the dual technique. The product stages are as follows; silica nanoparticles (21-38 nm), nanoclusters silica (46 – 67 nm), micro-wires silica (1.17 – 6.29 μm), and micro-ribbons silica (19.4 – 54.1 μm). It's allowing for use in environmental applications (multiple wastewater purification, multiple uses in air filters, as well as many industrial applications).

scholarly journals Catalysis by Candida antarctica B (CALB) immobilized on natural pure silica by adsorption: comparison with the free enzyme

2017 ◽  
Vol 107 (1) ◽  
pp. 10418
Author(s):  
A.J. Djossou ◽  
M Mazou ◽  
A.C. Toukourou ◽  
F.P. Tchobo ◽  
J Blin ◽  
...  
Keyword(s):  
Candida Antarctica ◽  
Free Enzyme ◽  
Pure Silica

Near infrared ultra-fast intense laser-induced colour centres in KCl crystal

2004 ◽  
Vol 263 (1-4) ◽  
pp. 648-649 ◽  
Author(s):  
Shoukui Pan ◽  
Benxue Jiang ◽  
Xiongwei Jiang ◽  
Jiangrong Qiu ◽  
Congshen Zhu
Keyword(s):  
Near Infrared ◽  
Intense Laser ◽  
Colour Centres

Considerations on the symmetry of pure silica ITQ-7 zeolite (ISV) derived from 29 Si MAS NMR and Rietveld analysis

2016 ◽  
Vol 219 ◽  
pp. 306-310
Author(s):  
Jean-Louis Paillaud ◽  
Lydie Tzanis ◽  
Bernd Marler ◽  
Séverinne Rigolet ◽  
Joël Patarin ◽  
...  
Keyword(s):  
Rietveld Analysis ◽  
Mas Nmr ◽  
Pure Silica
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