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Your search keyword '"Kurmysheva, Alexandra"' showing total 2 results
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2 results on '"Kurmysheva, Alexandra"'

1. Study of the thermal diffusivity of a ceramic-polymer material based on polyamide with the inclusion of varishaped aluminum oxide, obtained by the FFF method.

Author

Smirnov, Anton, Khmyrov, Roman, Kuznetsova, Ekaterina, and Kurmysheva, Alexandra

Subjects
THERMAL diffusivity, THERMAL conductivity, THERMAL properties, POLYAMIDES, ALUMINUM oxide
Abstract

The article is focused on studying Fused Filament Fabrication (FFF) of alumina-filled polymer objects and their thermal properties. To track influence of inclusion type on thermal diffusivity of 3D printed samples with equiaxed and needle-like Al2O3 particles were made. The difference between the microstructure of needle and equiaxed compositions was evaluated using Phenom G2Pro (Phenom-World BV, Eindhoven, The Netherlands). The tests of thermal diffusivity were carried out on LFA 467 HT HyperFlash setup (NETZSCH Inc., Germany). It was found that the addition of 20 vol. % of ceramic particles in polyamide (PA12) increases its thermal conductivity, and the shape and location of inclusions play an important role in heat flow processes. It is shown that specimens with alumina needle-like inclusions demonstrated the highest values of thermal diffusivity. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Removal of 2,4-Dichlorophenoxyacetic Acid from Aqueous Solutions Using Al 2 O 3 /Graphene Oxide Granules Prepared by Spray-Drying Method.

Author

Kurmysheva, Alexandra Yu., Kuznetsova, Ekaterina, Vedenyapina, Marina D., Podrabinnik, Pavel, Pinargote, Nestor Washington Solís, Smirnov, Anton, and Grigoriev, Sergey N.

Subjects
SPRAY drying, ALUMINUM oxide, AQUEOUS solutions, LANGMUIR isotherms, HERBICIDES, RAMAN microscopy, ADSORPTION capacity, GRAPHENE oxide
Abstract

Within this study, aluminum oxide granules with 0.25%vol. of graphene oxide were prepared by a spray-drying method to make an adsorbent for the 2,4-Dichlorophenoxyacetic acid (2,4-D) herbicide removal from aqueous solutions. The obtained adsorbent was studied using infrared spectroscopy, scanning electron microscopy and Raman spectroscopy. The presence of graphene in the spray-dried powder was confirmed. The adsorption removal of 2,4-D using the obtained material was performed at an ambient temperature by varying the process parameters such as pH and adsorption time. The adsorption of 2,4-D was a monolayer chemisorption according to the Langmuir isotherm pattern and a pseudo-second-order kinetic model. The maximum Langmuir adsorption capacity of the monolayer was 35.181 mg/g. The results show that the Al2O3-0.25%vol. GO powder obtained by spray drying is suitable for the production of adsorbents for toxic herbicides. [ABSTRACT FROM AUTHOR]

Published
2024
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