Thermal analysis of two types of dextran-coated magnetite |
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| Authors: | Oana Carp Luminita Patron Daniela C Culita Petru Budrugeac Marcel Feder Lucian Diamandescu |
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| Institution: | (1) Institute of Physical Chemistry “Ilie Murgulescu”, Splaiul Independentei, No.202, 060021 Bucharest, Romania;(2) ICPE-CA, Splaiul Unirii no.313, Bucharest, Romania;(3) National Institute of Materials Physics, 105 bis Atomistilor Street, P.O. Box. Mg-7, Bucharest-Magurele, R-077125, Romania; |
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| Abstract: | The thermal stability of two kinds of dextran-coated magnetite (dextran with molecular weight of 40,000 (Dex40) and 70,000
(Dex70)), obtained by dextran adsorption onto the magnetite surface is investigated in comparison with free dextran in air
and argon atmosphere. The thermal behavior of the two free dextran types and corresponding coated magnetites is similar, but
atmosphere dependent. The magnetite catalyzes the thermal decomposition of dextran, the adsorbed dextran displaying lower
initial decomposition temperatures comparative with the free one in both working atmospheres. The dextran adsorbed onto the
magnetite surface decomposes in air through a strong sharp exothermic process up to ~450 °C while in argon atmosphere two
endothermic stages are identified, one in the temperature range 160–450 °C and the other at 530–800 °C. |
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