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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-1391</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="ru"><subject>СПЕКТРОСКОПИЯ РАССЕИВАЮЩИХ СРЕД</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SPECTROSCOPY OF SCATTERING MEDIA</subject></subj-group></article-categories><title-group><article-title>Спектры пропускания разбавленных и концентрированных коллоидов магнетита в жидких диэлектриках</article-title><trans-title-group xml:lang="en"><trans-title>Transmission Spectra of Diluted and Concentrated Magnetite Colloids in Liquid Dielectrics</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>Ерин</surname><given-names>К. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Yerin</surname><given-names>K. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ставрополь</p></bio><bio xml:lang="en"><p>Stavropol</p></bio><email xlink:type="simple">exiton@inbox.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вивчарь</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Vivchar</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ставрополь</p></bio><bio xml:lang="en"><p>Stavropol</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Северо-Кавказский федеральный университет</institution></aff><aff xml:lang="en"><institution>North Caucasus Federal University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>23</day><month>11</month><year>2023</year></pub-date><volume>90</volume><issue>6</issue><fpage>843</fpage><lpage>849</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ерин К.В., Вивчарь В.И., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Ерин К.В., Вивчарь В.И.</copyright-holder><copyright-holder xml:lang="en">Yerin K.V., Vivchar V.I.</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://zhps.ejournal.by/jour/article/view/1391">https://zhps.ejournal.by/jour/article/view/1391</self-uri><abstract><p>Исследованы спектры пропускания коллоидных растворов наночастиц магнетита в керосине с различной объемной концентрацией твердой фазы и влияние на них внешнего магнитного поля. Обнаружено, что с увеличением концентрации магнетита в спектрах появляется выраженный максимум в ближней ИК-области 740—760 нм. Установлены пределы концентрации магнетита, при которых спектры пропускания успешно описываются на основе закона Бугера—Ламберта. Показано, что появление максимума в спектрах пропускания при повышении концентрации связано с минимумом в спектре мнимой части показателя преломления наноразмерного магнетита.</p></abstract><trans-abstract xml:lang="en"><p>The transmission spectra of colloidal solutions of magnetite nanoparticles in kerosene with different volume concentrations of the solid phase and the influence of an external magnetic field on them have been studied. It has been found that with increasing the magnetite concentration, a pronounced maximum in the near-infrared region of 740–760 nm appeares in the spectra. The limits of magnetite concentration have been established at which the transmission spectra are successfully described based on the Bouguer–Lambert law. It is shown that the appearance of a maximum in the transmission spectra with increasing concentration is associated with a minimum in the spectrum of the imaginary part of the refractive index of nanosized magnetite.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>магнитная жидкость</kwd><kwd>наночастица магнетита</kwd><kwd>спектр пропускания</kwd><kwd>рассеяние света</kwd><kwd>модель эффективной среды</kwd></kwd-group><kwd-group xml:lang="en"><kwd>magnetic fluid</kwd><kwd>magnetite nanoparticle</kwd><kwd>transmission spectra</kwd><kwd>light scattering</kwd><kwd>effective medium model</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке государственного задания Министерства науки и высшего образования РФ (проект FSRN-2023-0006) с использованием оборудования Центра коллективного пользования Северо-Кавказского федерального университета и при финансовой поддержке Министерства науки и высшего образования РФ (проект RF-2296.61321X0029, соглашение № 075-15-2021-687)</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">Р. 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