Obtaining of γ-Fe2O3 nanoparticles by thermal decomposition of polyethyleneglycol–iron nitrate mixtures

A Series of iron oxides/CNTs compounds were prepared using a method of impregnation with iron nitrate solution and followed thermal decomposition. The compounds were characterized by the means of scanning electronic microscope, X-ray diffraction and thermogravimetic analysis. The dielectric and microwave-absorbing properties of EP composites containing the different compounds were further measured in a specific frequency range. The results show that: CNTs show reduction at a high temperature, and can make products of the thermal decomposition of iron nitrate produce iron oxide nanoparticles with different valence states at different temperatures. With increasing decomposition temperature, the iron oxides in CNTs composites in turn are Fe2O3, Fe3O4, FeO and Fe. Compared with pure CNTs, these iron oxides/CNTs composites have better microwave absorbing properties in the wavebands of 7.5GHz ~ 15GHz and 26.5GHz ~ 40GHz. Among those iron oxides /CNTs compounds, Fe3O4/CNTs compound has the best microwave absorbing property.

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Highly active catalysts based on 3D hierarchically ordered porous carbon with entrapped Fe2O3 nanoparticles for the thermal decomposition of ammonium perchlorate

Applied Surface Science ◽

10.1016/j.apsusc.2020.148148 ◽

2021 ◽

Vol 538 ◽

pp. 148148

Author(s):

Jin Chen ◽

Simin He ◽

Yousong Liu ◽

Zhiqiang Qiao ◽

Bing Huang ◽

...

Keyword(s):

Thermal Decomposition ◽

Ammonium Perchlorate ◽

Porous Carbon ◽

Fe2o3 Nanoparticles ◽

Highly Active ◽

Ordered Porous

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BIOCATALYTIC SYNTHESIS OF D-GLUCONIC ACID

Вестник Тверского государственного университета. Серия: Химия ◽

10.26456/vtchem2021.1.4 ◽

2021 ◽

pp. 30-35

Author(s):

Ольга Валентиновна Гребенникова ◽

Александрина Михайловна Сульман

Keyword(s):

Thermal Decomposition ◽

Magnetite Nanoparticles ◽

Gluconic Acid ◽

Comparative Characteristic ◽

Iron Nitrate ◽

Native Form ◽

Aluminum Oxides ◽

Pharmaceutical Industries ◽

Optimal Ph ◽

Mesoporous Oxides

D-глюконовая кислота является широко потребляемым продуктом в пищевой и фармацевтической промышленностях. Данная работа посвящена разработке биокатализатора окисления D-глюкозы до D-глюконовой кислоты. Биокаталитические системы были выполнены на основе глюкозооксидазы, иммобилизованной на магнитоотделяемые мезопористые оксиды SiO и AlO, которые были синтезированы путем образования наночастиц магнетита в порах оксидов кремния и алюминия в результате термического разложения нитрата железа, инкорпорированного пропиткой. В работе подобраны оптимальные значения рН и температуры, при которых синтезированные биокатализаторы способны работать. Произведена сравнительная характеристика работы биокаталитических систем по сравнению с нативной формой глюкозооксидазы. D-gluconic acid is a widely consumed product in the food and pharmaceutical industries. This work is devoted to the development of a biocatalyst for the oxidation of D-glucose to D-gluconic acid. Biocatalytic systems were based on hycose oxidase immobilized on magnetically detachable mesoporous oxides SiO and AlO, which were synthesized by the formation of magnetite nanoparticles in the pores of silicon and aluminum oxides as a result of thermal decomposition of iron nitrate incorporated by impregnation. In this work, the optimal pH and temperature values were selected, at which the synthesized biocatalysts are able to work. A comparative characteristic of the work of biocatalytic systems in comparison with the native form of glucose oxidase has been made.

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Production and in situ transformation of hematite into magnetite from the thermal decomposition of iron nitrate or goethite mixed with biomass

Journal of Thermal Analysis and Calorimetry ◽

10.1007/s10973-019-08639-1 ◽

2019 ◽

Vol 139 (3) ◽

pp. 1731-1739

Author(s):

Marluce Oliveira da Guarda Souza ◽

Marcos Vinicius Ribeiro dos Santos ◽

Lucas Malone Ferreira Castro ◽

Carine Pereira da Silva

Keyword(s):

Thermal Decomposition ◽

Iron Nitrate

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