Physico-Chemical Characterization of Alumina Sols Prepared From Aluminum Alcoxides

Autor:	William L. Olson
Rok vydání:	1986
Předmět:	chemistry.chemical_classification Materials science Chemical engineering chemistry Elution Aluminium Size-exclusion chromatography Evaporation Viscometer Molecule chemistry.chemical_element Polymer Nuclear magnetic resonance spectroscopy
Zdroj:	MRS Proceedings. 73
ISSN:	1946-4274 0272-9172
Popis:	Alumina sols derived from aluminum sec-butoxide (Yoldas) were characterized. The distribution of the polymer sizes within the sol, determined by gel filtration chromatography (GFC), was found to be dramatically affected by small changes in the chemical processing or preparative procedure. Aging the sol at room temperature for two weeks produced no significant change in the GFC elution curves of the alumina sol. Sols with a “milky” appearance were found to exhibit a wider distribution of polymers by GFC than transparent sols. Rotary evaporation of the sol followed by redissolution of the residue was found to change the polymer size distribution described by the gel filtration elution curves. These observations coupled with 27Al NMR spectroscopy and viscometry measurements were used to elucidate the effects of process conditions and aging on the molecular structure of the sol.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::27dfbeb60a79ac739ded1830ca482943 https://doi.org/10.1557/proc-73-611 Zobrazit plný text záznamu Full text from SpringerLink