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Thermal analysis of two types of dextran-coated magnetite

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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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Authors and Affiliations

  1. Institute of Physical Chemistry “Ilie Murgulescu”, Splaiul Independentei, No.202, 060021, Bucharest, Romania

    Oana Carp, Luminita Patron & Daniela C. Culita

  2. ICPE-CA, Splaiul Unirii no.313, Bucharest, Romania

    Petru Budrugeac

  3. National Institute of Materials Physics, 105 bis Atomistilor Street, P.O. Box. Mg-7, Bucharest-Magurele, R-077125, Romania

    Marcel Feder & Lucian Diamandescu

Authors
  1. Oana Carp
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  2. Luminita Patron
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  3. Daniela C. Culita
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  4. Petru Budrugeac
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  5. Marcel Feder
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  6. Lucian Diamandescu
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Correspondence to Daniela C. Culita.

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Carp, O., Patron, L., Culita, D.C. et al. Thermal analysis of two types of dextran-coated magnetite. J Therm Anal Calorim 101, 181–187 (2010). https://doi.org/10.1007/s10973-009-0593-3

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  • DOI: https://doi.org/10.1007/s10973-009-0593-3

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