Study of the effect of prolonged magnetic stirring on the physico-chemical surface properties of nanometric transition alumina |
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| Authors: | B Bonelli P Palmero F Lomello M Armandi M Lombardi |
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| Affiliation: | (1) Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, INSTM Research Unit PoliTO, C.so Duca degli Abruzzi 24, 10129 Torino, Italy;(2) IIT-Italian Institute of Technology @ POLITO–Centre for Space Human Robotics, C.so Trento 21, 10129 Torino, Italy |
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| Abstract: | This article reports the study of a transition nanometric alumina both as such and after prolonged magnetic stirring in bi-distilled
water. Stirring was effective in inducing a significant reduction of starting particles agglomeration and modification of
the surface properties of the material. The formation of an Al(OH)3 (gibbsite) phase after magnetic stirring in water was detected by means of XRD on powdered samples. Correspondingly, Infra
Red spectrum of magnetically stirred alumina outgassed at 150 °C showed a band at ca. 3300 cm−1, ascribable to the hydroxide phase, which decomposes at higher temperature. Differential thermal analysis and thermogravimetry
also showed a different thermal behaviour between the two materials, in that magnetically stirred alumina presents a broad
endothermic peak at about 280 °C accompanied by an abrupt mass loss (ca. 0.5% of the initial weight), due to dehydration of
the hydroxide phase. |
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