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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2220-8054-2021-12-3-303-310</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-488</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CHEMISTRY AND MATERIALS SCIENCE</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ХИМИЯ И НАУКА О МАТЕРИАЛАХ</subject></subj-group></article-categories><title-group><article-title>Formation of cobalt ferrite nanopowders in an impinging-jets microreactor</article-title><trans-title-group xml:lang="ru"><trans-title>Формирование нанопорошков феррита кобальта в микрореакторе со сталкивающимися струями</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Barashok</surname><given-names>K. I.</given-names></name><name name-style="western" xml:lang="en"><surname>Barashok</surname><given-names>K. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>Professora Popova St., 5, Saint Petersburg, 197376</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Panchuk</surname><given-names>V. V.</given-names></name><name name-style="western" xml:lang="en"><surname>Panchuk</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Universitetskaya emb., 7-9, Saint Petersburg, 199034</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Semenov</surname><given-names>V. G.</given-names></name><name name-style="western" xml:lang="en"><surname>Semenov</surname><given-names>V. G.</given-names></name></name-alternatives><bio xml:lang="en"><p>Universitetskaya emb., 7-9, Saint Petersburg, 199034</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Almjasheva</surname><given-names>O. V.</given-names></name><name name-style="western" xml:lang="en"><surname>Almjasheva</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Professora Popova St., 5, Saint Petersburg, 197376</p><p>Politekhnicheskaya St. 26, Saint Petersburg, 194021</p></bio><email xlink:type="simple">almjasheva@mail.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Abiev</surname><given-names>R. Sh.</given-names></name><name name-style="western" xml:lang="en"><surname>Abiev</surname><given-names>R. Sh.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moskovsky Pr., 26, Saint Petersburg, 190013</p><p>Makarova emb., 2 Saint Petersburg, 199034</p></bio><email xlink:type="simple">rufat.abiev@gmail.com</email><xref ref-type="aff" rid="aff-4"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Saint Petersburg State Electrotechnical University “LETI”</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>Saint Petersburg State University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-3"><institution>Saint Petersburg State Electrotechnical University “LETI”; Ioffe Institute</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-4"><institution>Saint Petersburg State Institute of Technology; Institute of Silicate Chemistry RAS</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>04</day><month>08</month><year>2025</year></pub-date><volume>12</volume><issue>3</issue><fpage>303</fpage><lpage>310</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Barashok K.I., Panchuk V.V., Semenov V.G., Almjasheva O.V., Abiev R.S., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Barashok K.I., Panchuk V.V., Semenov V.G., Almjasheva O.V., Abiev R.S.</copyright-holder><copyright-holder xml:lang="en">Barashok K.I., Panchuk V.V., Semenov V.G., Almjasheva O.V., Abiev R.S.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://nanojournal.ifmo.ru/jour/article/view/488">https://nanojournal.ifmo.ru/jour/article/view/488</self-uri><abstract><p>The dependence of cobalt ferrite nanosized powder production process on the synthesis method and conditions was studied. The paper shows the possibility for producing nanocrystalline CoFe2O4 with an average particle size of 12 nm under conditions of an impinging-jets microreactor at room temperature. The influence exerted by the parameters of process implementation in the microreactor on phase formation in the CoO–Fe2O3–H2O system was analyzed.</p></abstract><trans-abstract xml:lang="ru"><p>Исследована зависимость процесса получения наноразмерного порошка феррита кобальта от метода и условий синтеза. В работе показана возможность получения нанокристаллического CoFe2O4 со средним размером частиц 12 нм в условиях микрореактора со сталкивающимися струями при комнатной температуре. Проанализировано влияние параметров проведения процесса в микрореакторе на фазообразование в системе CoO–Fe2O3–H2O.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>феррит кобальта</kwd><kwd>наноразмерные порошки</kwd><kwd>микрореактор со сталкивающимися струями</kwd></kwd-group><kwd-group xml:lang="en"><kwd>cobalt ferrite</kwd><kwd>nanosized powders</kwd><kwd>impinging jet microreactor</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The authors express their gratitude to Zimina O.Yu. for the helping with the experiment and V.V. Gusarov for the attention he paid to the work and for his help in the interpretation of the results.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Sharifi I., Shokrollahi H., Amiri S. Ferrite-based magnetic nanofluids used in hyperthermia applications. 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