Библиографическое описание:ВЛИЯНИЕ ПОЛИСАХАРИДОВ НА ДИСПЕРСНОСТЬ ФЕРРИТОВ КОБАЛЬТА И МЕДИ, ПОЛУЧЕННЫХ С ИСПОЛЬЗОВАНИЕМ АНИОНООБМЕННОГО ОСАЖДЕНИЯ : доклад, тезисы доклада / рец. М. В. Пантелеева. - [Б. м. : б. и.], 2019. - Текст : непосредственный // ЦВЕТНЫЕ МЕТАЛЛЫ И МИНЕРАЛЫ - 2019 : сборник докладов Одиннадцатого международного конгресса / XXV КОНФЕРЕНЦИЯ «АЛЮМИНИЙ СИБИРИ»; XV КОНФЕРЕНЦИЯ «ЗОЛОТО СИБИРИ»; XIII КОНФЕРЕНЦИЯ «МЕТАЛЛУРГИЯ ЦВЕТНЫХ, РЕДКИХ И БЛАГОРОДНЫХ МЕТАЛЛОВ » (2019 ; 16.09 - 20.09 ; Красноярск) : Общество с ограниченной ответственностью "Научно-инновационный центр", 2019. - С. 877-878. - ISBN 9785907208193. Перевод заглавия: THE EFFECTS OF POLYSACCHARIDES ON GRANULOMETRICK COMPOSITION AND MORPHOLOGY OF CoFe2O4 AND CuFe2O4 NANOPARTICLES
Аннотация:The cobalt ferrite and copper ferrite attract inexhaustible interest because of its high cubic magneto-crystalline anisotropy, high coercivity and moderate saturation magnetization. It has wide practical applications to information storage system, ferrofluid technology, magnetocaloric refrigeration, telecommunication equipment, gas sensors and etc. In addition, magnetic particles of ferrites are used in medicine for image contrast enhancement in magnetic resonance imaging, diagnosis of diseases, targeted delivery of drugs and cancer therapy by magnetic hyperthermia. A lot of synthetic strategies for preparing cobalt ferrite and copper ferrite have been presented. It can be prepared by solid-state reaction, the mechano-chemical method, sol-gel and co-precipitation method from aqueous solutions . The main disadvantages of solid-state reaction are a continuous grinding of powders and multi-stage heat treatment at high temperatures. The process of the sol-gel synthesis is very long. There are the contact of substances and the formation of compounds that take place already at the stage of deposition in the co-precipitation method. A main disadvantage of the reagent precipitation method is the need for the long-term washing of the formed precipitate, which results in the formation of a large amount of rinsing waters subject to utilization. One way to solve this problem is to use an organic ion exchanger for synthesis. The method of anion-exchange deposition offers several advantages, for example, the process is done in stationary conditions and obtained particles are homogeneous. Moreover, products don't contain impurities of the counter ions and therefore don't require multiple operations of washing and cleaning of precipitate. Another advantage of this method is its cost-effectiveness In this work, it has been shown that the addition of polysaccharides with different molecular weights into the system has a noticeable impact on the growth and agglomeration of the particles, as well as on the composition of the deposition products. The mechanism of the effect of polysaccharides on the system is considered. It is established that aggregation resistant nanoparticles of cobalt ferrite and copper ferrite with a size of 10-20 nm are formed only in the presence of dextran with a molecular mass of 40,000 g /mol. Chemical analysis, complex thermal analysis, X-ray powder diffraction, dynam-ic light scattering and electrophoretic light scattering, IR-FTIR-spectroscopy, TEM and magnetometry techniques have been used to characterize the precursors and their heat treatment products.
