Incorporation of Silica Into RF Gel for the Synthesis of Porous Si3 N4/SiC Composite Via the Carbothermal Reduction and Nitridation PDF Download
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Author:
Publisher:
ISBN:
Category : Silica
Languages : en
Pages : 196
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Book Description
Incorporation of silica into RF solution, which was prepared via the sol-gel polycondensation of resorcinol and formaldehyde with sodium carbonate as catalyst was investigated. The reaction between silica precursor and RF solution is quite violent and strongly exothermic. The addition of acetic acid into RF solution damages methylene and methylene ether bridges of the RF clusters, which enables the incorporation of increased amount of silica into the RF clusters. According to the experimental results, silica precursor (APTMS, MPTMS) incorporates into RF clusters at positions of hydroxyl group. Then, the silica/RF gel was converted into silica/carbon composite by pyrolysis before subjected to the carbothermal reduction and nitridation to synthesize silicon nitride/silicon carbide. The results indicated that temperature and porosity of silica/carbon composite does not affect the formation of silicon nitride or silicon carbide. Phase of the product depends upon chemical structure of silica/RF gel formed by polycondensation.
Author:
Publisher:
ISBN:
Category : Silica
Languages : en
Pages : 196
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Book Description
Incorporation of silica into RF solution, which was prepared via the sol-gel polycondensation of resorcinol and formaldehyde with sodium carbonate as catalyst was investigated. The reaction between silica precursor and RF solution is quite violent and strongly exothermic. The addition of acetic acid into RF solution damages methylene and methylene ether bridges of the RF clusters, which enables the incorporation of increased amount of silica into the RF clusters. According to the experimental results, silica precursor (APTMS, MPTMS) incorporates into RF clusters at positions of hydroxyl group. Then, the silica/RF gel was converted into silica/carbon composite by pyrolysis before subjected to the carbothermal reduction and nitridation to synthesize silicon nitride/silicon carbide. The results indicated that temperature and porosity of silica/carbon composite does not affect the formation of silicon nitride or silicon carbide. Phase of the product depends upon chemical structure of silica/RF gel formed by polycondensation.
Author:
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ISBN:
Category : Ceramics
Languages : en
Pages : 1040
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Book Description
![Synthesis of Sub-micron [alpha]-si3n4 Powders Via Carbothermal Nitridation Using Novel Carbon Coated Silica Precursors PDF](https://books.google.com/books/content/images/frontcover/t8_tNwAACAAJ?fife=w80-h100)
Author: Swaroop Kaza
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
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Book Description
Author: David R. Chacon
Publisher:
ISBN:
Category : Ceramic metals
Languages : en
Pages : 266
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Author:
Publisher:
ISBN:
Category : Ceramic materials
Languages : en
Pages : 674
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Author: Mahesh Sachithanadam
Publisher: Springer
ISBN: 9811004404
Category : Technology & Engineering
Languages : en
Pages : 149
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Book Description
This book explores the improvement in thermal insulation properties of protein-based silica aerogel composites fabricated by a novel, inexpensive and feasible method. The resulting material exhibits polymeric foam behavior including high compressibility, super-hydrophobic qualities and excellent strain recovery in addition to low thermal conductivity. The fabrication methodologies are explained in great detail and represented in flowcharts for easy reference and understanding. This monograph gives readers a new perspective on composite fabrication using methods other than the traditional ones and explores the endless ways of altering the composition to modify the properties of the silica aerogel composites. Applications for this novel composite are diverse and range from those in the pharmaceutical and aerospace industries to the oil and gas industries.
Author:
Publisher:
ISBN:
Category : Ceramic materials
Languages : en
Pages : 386
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Author: Mario Pagliaro
Publisher: Royal Society of Chemistry
ISBN: 1847557163
Category : Technology & Engineering
Languages : en
Pages : 208
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Book Description
This is the first book to address the hot topic of functional silica gels and their applications. Originally used mainly in chromatography, specialized silica gels have evolved into crucially important functional nanomaterials suitable for use in, amongst other things, chemical synthesis, analysis, purification, surface protection and drug release. It is estimated that the world's current 1 billion dollar market for sol-gels (mostly silica-based) will grow by more than 5% per year from 2006 to 2011. Actually, as many revolutionary products are now reaching the market, it will increase much faster. Commercial applications include glasses, paints, catalysts and fragrances. Medical uses include the delivery of vitamins, hormones and acne treatments and the synthesis of the powerful anticancer drug, taxol. Sol-gel technology also forms the basis of the MetaChip, thanks to which potential new drugs can be identified rapidly and simultaneously. With content relevant to both scientific and commercial viewpoints, the book will interest researchers and undergraduates as well as managers and consultants in the chemical industry. Those from an industrial background will gain a clear picture of what this technology is all about and how it can be used to solve their specific problems. All readers will benefit from the clear, concise style and consistent treatment of topics. The book demonstrates how chemists synthesize, from the bottom-up, tailor-made (nano)materials of immense practical importance spanning the fields of chemistry, physics, materials science, engineering, biology and medicine. It also shows how the versatility of silica gels results from their physical and chemical properties. An updated outlook on new commercial products, and the companies which make them, greatly adds relevance and practical value to the text.
Author:
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ISBN:
Category : Engineering
Languages : en
Pages : 572
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Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 2676
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