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Вид документа : Статья из журнала
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Автор(ы) : Chzhan A.V., Vasiliev A. D., Isaeva T. N., Patrin G. S.
Заглавие : Research of features magnetic permeability and domain structures in Fe 2O3:GA crystals near the morin transition
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Solid State Phenomena. - 2009. - Vol. 152-153. - С. 29-32. - ISSN 10120394 (ISSN); 390845168X (ISBN); 9783908451686 (ISBN), DOI 10.4028/www.scientific.net/SSP.152-153.29
Ключевые слова (''Своб.индексиров.''): antiferromagnetic--domain structure--hematite--morin transition--weakly ferromagnetic--antiferromagnetic materials--antiferromagnetism--capillarity--crystal impurities--crystals--ferromagnetic materials--ferromagnetic resonance--ferromagnetism--gallium--hematite--iron ores--magnetic permeability--oxide minerals--permanent magnets--antiferromagnetism--crystal impurities--ferromagnetic materials--ferromagnetism--gallium--hematite--iron compounds--magnetic materials--magnetic permeability--magnetism--afm--antiferromagnetic--antiferromagnetic domains--antiferromagnetics--basal planes--domain configurations--domain structure--morin transitions--multi-layered structure--weakly ferromagnetic--magnetic domains--magnetic domains
Аннотация: Specially picked up web-chamber is used for visualization of domain structure in hematite. An analysis of domain configuration shows, that domain structure of hematite in a basal plane represents multilayered structure which contains domains both in paralleled thickness and in the parallel basal planes. The temperature features of magnetic permeability and domain structures in Fe2O3:Ga crystals near the Morin transition are investigated. Observable changes of magnetic permeability and changes in domain structure confirm that transition from AFM to WFM occurs in the hematite with Ga impurity as transition of the first sort. Results of research of antiferromagnetic and weakly ferromagnetic resonances (AFMR and WFMR) in these compounds are presented.
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Вид документа : Статья из журнала
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Автор(ы) : Pryazhnikov M. I., Zhigarev V. A., Minakov A. V., Nemtsev I. V.
Заглавие : Spontaneous imbibition experiments for enhanced oil recovery with silica nanosols
Колич.характеристики :14 с
Место публикации : Capillarity. - 2024. - Vol. 10, Is. 3. - P.73-86. - ISSN 27092119 (ISSN), DOI 10.46690/capi.2024.03.02. - ISSN 26523310 (eISSN)
Примечания : Cited References: 53. - This work is partially financed by Ministry of Science and Higher Education of the Russian Federation (No. FSRZ2020-0012)
Аннотация: Experimental oil displacement as a result of spontaneous imbibition of silica nanosols has been carried out using two types of sandstone as the reservoir rock. The permeability of the cores ranged from 0.34 to 333 mD, while the porosity was 11% and 22%, respectively. During the research, the influence of the concentration and nanoparticle size, as well as the permeability of the rock, on the process of spontaneous imbibition, was studied. Silica nanosols were considered as an object of study. The nanoparticle size ranged from 10 to 35 nm. The mass concentration of nanoparticles varied from 0.01% to 0.25%. It was found that the use of silica nanosols significantly increases the rate of the spontaneous imbibition process. It was established that a silica nanosol with a nanoparticle size of 10 nm and a concentration of 0.25% allows to displace more than six times oil compared to the reservoir water model in the same time. As a result, it was shown that the oil displacement efficiency and the efficiency of spontaneous imbibition increase along with an increase in the nanoparticle concentration and a decrease in the nanoparticle size.
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