Properties of Iron-Containing Nanohydroxyapatite- Based Composites

EPR spectra of the (a) N-a and (b) N-c samplesProperties of Iron-Containing Nanohydroxyapatite-Based Composites. Pankratov D.A., Dolzhenko V.D., Ovchenkov E.A., Anuchina M.M., Severin A.V. //Inorganic Materials. 2017. V.53. №1. P.89-98.Search the full text below. Ищи полный текст ниже.

The paramagnetic properties of compounds resulting from the synthesis of nanohydroxyapatite in the presence of Fe(III) ions have been studied by electron paramagnetic resonance, Mössbauer spectroscopy, and magnetochemistry. Based on the obtained results on the mechanism of the reaction between an orthophosphoric acid solution and an aqueous calcium hydroxide suspension, we have found conditions for incorporating Fe(III) impurity ions into hydroxyapatite. We have studied samples differing in the sequence in which reagents were mixed and in hydroxyapatite crystallite formation conditions. It has been shown that, in all instances, the composition and properties of the iron-containing phases in the composites depend significantly on both synthesis and heat treatment conditions.

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3.1. Методика предварительной обработки электрода

16.3.1. Методика предварительной обработки электрода

Методика предварительной обработки электрода

Перед использованием обрабатывают поверхность платинового электрода, удаляя все следы предыдущих операций:

  • Вымачивают в пергидроле в течение 15 мин.
  • Ополаскивают дистиллированной водой.
  • Вымачивают в чистой азотной кислоте (d = 1,37) в течение 15 мин.
  • Ополаскивают чистой хлористоводородной кислотой (d = 1,19) в течение 15 мин.
  • Промывают проточной водой в течение 2 ч.

 

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Synthesis and magnetic properties of cobalt ferrite nanoparticles in polycarbosilane ceramic matrix

Mössbauer spectra of the sample comprised of cobalt ferrite nanoparticles in a ceramic matrix after sintering in argon.Synthesis and magnetic properties of cobalt ferrite nanoparticles in polycarbosilane ceramic matrix. Yurkov G.Y., Shashkeev K.A., Kondrashov S.V., Popkov O.V., Shcherbakova G.I., Zhigalov D.V., Pankratov D.A., Ovchenkov E.A., Koksharov Yu.A. //Journal of Alloys and Compounds. 2016. V.686. P.421–430

Composite materials comprised of a ceramic matrix with metal-containing nanoparticles were prepared by sintering a blend of cobalt ferrite nanoparticles and polycarbosilane. Sintering process was performed either in air or argon, resulting in different material composition. The air-sintering materials consist mainly of oxide phases (silica matrix and cobalt ferrite nanoparticles). The process of sintering in argon leads to partial reduction of oxides and formation of α-Fe, carbide and silicate phases. The prepared samples were characterized by the SEM, TEM, XRD and EMR techniques and the Mössbauer spectroscopy. Static magnetic properties were also studied. All samples were found to be soft magnetic. Sintering, especially in argon, increases remnant magnetization of resulting composite products.

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