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Titolo:
HYDROLYSIS AND CONDENSATION RATES OF TETRAMETHYL ORTHOSILICATE IN ALCOHOL-SOLUTIONS OF HYDRATED METAL-SALTS AS DETERMINED BY MEANS OF FT-IRSPECTROSCOPY
Autore:
OYE G; LIBNAU FO; SJOBLOM J; FRIBERG SE;
Indirizzi:
UNIV BERGEN,DEPT CHEM,ALLEGATEN 41 N-5007 BERGEN NORWAY UNIV BERGEN,DEPT CHEM N-5007 BERGEN NORWAY CLARKSON UNIV,CTR ADV MAT PROC POTSDAM NY 13699
Titolo Testata:
Colloids and surfaces. A, Physicochemical and engineering aspects
, volume: 123, anno: 1997,
pagine: 329 - 337
SICI:
0927-7757(1997)123:<329:HACROT>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOL-GEL KINETICS; DIELECTRIC-PROPERTIES; VIBRATIONAL-SPECTRA; NITRATE HYDRATE; TETRAETHOXYSILANE;
Keywords:
CONDENSATION; FT-IR SPECTROSCOPY; HYDRATION WATER; HYDROLYSIS; RATE CONSTANTS; TETRAMETHYL ORTHOSILICATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
G. Oye et al., "HYDROLYSIS AND CONDENSATION RATES OF TETRAMETHYL ORTHOSILICATE IN ALCOHOL-SOLUTIONS OF HYDRATED METAL-SALTS AS DETERMINED BY MEANS OF FT-IRSPECTROSCOPY", Colloids and surfaces. A, Physicochemical and engineering aspects, 123, 1997, pp. 329-337

Abstract

Hydrolysis and condensation of tetramethyl orthosilicate (TMOS) in alcohol solutions of hydrated metal salts have been studied. The alcohols were methanol and ethanol, and the metal salts were nickel nitrate hexahydrate (Ni(NO3)(2) . 6H(2)O) and calcium nitrate tetrahydrate (Ca(NO3)(2) . 4H(2)O). The reactions were followed by means of FT-IR spectroscopy and the rate constants were calculated by using multiple linear regression. The results show that both the hydrolysis and the condensation rates increase with increasing amounts of hydration water. There is also a pronounced difference in the reactions when different metal salts are used. The nickel systems have a much faster hydrolysis rate than the calcium systems. This is probably due to different dissociation states in the two metal complexes. In addition some influence of the solvent was found.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 10:11:27