NNC RK Bulletin

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ELECTRONIC STRUCTURE, MAGNETIC PROPERTIES AND STABILITY OF HEUSLER ALLOYS Mn2Co1−x VxZ (Z = Al, Ga)
(2020-12-30)
Fatima U. Abuova
;
Талгат Муратович Инербаев
;
Aisulu U. Abuova
;
G. A. Kaptagay
;
N. A. Merali
Two sets of Heusler alloys of the type Mn2Co1−xVxZ (Z = Al, Ga) were studied by computer simulation methods using density functional theory. Changes in the absolute value and direction of the lattice ions' magnetic moments are investigated depending on the chemical composition. Topological analysis of the charge distribution on the crystal lattice atoms is carried out to explain the results obtained. It is shown that changes in the magnetic properties are determined by the system's charge ions' states. The fundamental difference between Al- and Ga-containing alloys is Ga ions' ability, in contrast to Al ions, to change their charge state as the vanadium concentration increases, which gives an additional degree of freedom for modifying the electronic structure of the studied compounds.
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DEVELOPMENT OF TECHNOLOGY FOR OBTAINING A BIODEGRADABLE POLYMER
(2023-10-07)
K. Sh. Shynzhyrbai
;
Сейтхан Азат
;
Mukhametkali Musagalievich Mataev
;
Ulan Zhantikeyev
;
Kainaubek Toshtay
An important technological solution for plastic pollution is the replacement of traditional biodegradable polymers, biodegradable polymer materials with physico-mechanical properties that cause environmental pollution. An urgent problem is the search for ways to reduce the self-decomposition of biopolymers and waste, as well as to reduce the cost of such materials, including the use for these purposes of substances that can be analogues of biodegradable polymers. The research work is aimed at obtaining a biodegradable biopolymer based on starch raw materials in the presence of various organic acids (citric acid, acetic acid, lactic acid) and plasticizers (glycerin, polyvinyl alcohol, nanomaterial). An effective material was selected from the products obtained from various acids and plasticizers. Measures to improve the technology of bioplastics production are considered. A durable and economical biopolymer capable of processing and biodegrading biological waste, including starch-containing garbage, has been obtained. The resulting products have successfully passed all physico-chemical tests and are ready for mass production. A scanning electron microscope and thermogravimetric analysis with IR spectroscopy were used to study the physicochemical parameters of the obtained biopolymers.
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