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The Topographic Peculiarities of the Formation of Nanosized Particles from Metallopolymers

100%

Pomogailo A., Dzhardimalieva G., Rosenberg A.

Acta Physica Polonica A

2002

vol. 102

issue 1

135-145

The morphology of solid phase products of thermal transformation of transition metal acrylates or its cocrystallites is studied. The thermal transformation of the metal-containing monomers studied consists in dehydration, solid phase polymerization and thermolysis process. The topography of the initial compounds and solid phase products of thermal decay, as well as their composition, are analyzed by optical and electron microscopies. The average particle sizes, d_{EM}, are: 6.0-13.0 nm in the case of FeAcr_6 (based on the data of electron diffraction, the main product is Fe_3O_4), 6.0 nm for FeCoAcr_8 and Fe_2CoAcr_{14} (Fe_3O_4, CoO, Fe_2CoO_4), and 6 nm for CoMal_2 (CoO). The material formed consists of nanosized metal particles uniformly allotted in polymer matrix.

Structure and Magnetic Proporties of Polymer Matrix Nanocomposites

64%

Ławecka M., Leonowicz M., Kopcewicz M., Ślawska-Waniewska A., Kozubowski J., Dzhardimalieva G., Rosenberg A., Pomogailo A.

Acta Physica Polonica A

2002

vol. 102

issue 2

317-321

Structure and magnetic properties of the thermal decomposition products of Fe(III)Co(II) acrylate complex were analysed. The crystalline phases, which were found in the fully processed material, at 643 K, were Fe_3O_4, CoFe_2O_4, and CoO and had a mean particle size of about 30 nm. In the intermediate stages of the thermolysis iron was present in a form of Fe^{III} (trivalent low-spin iron), Fe^{2+} (divalent high-spin iron), and Fe_3O_4. The coercivity and remanence were measured versus temperature in the range of 5-300 K, in 1.1 T applied field. Both, _MH_c and M_r, decreased showing room temperature values of 0.038 T and 7.49 mT, for coercivity and remanence, respectively. At temperatures below 200 K the hysteresis loops were asymmetrical, opened and shifted towards negative field values.

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2 Acta Physica Polonica A

2 2002

2 Dzhardimalieva G.

2 Pomogailo A.

2 Rosenberg A.

1 Kopcewicz M.

1 Kozubowski J.

1 Leonowicz M.

1 Ławecka M.

1 Ślawska-Waniewska A.

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The Topographic Peculiarities of the Formation of Nanosized Particles from Metallopolymers

Structure and Magnetic Proporties of Polymer Matrix Nanocomposites