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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">techusgu</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Юго-Западного государственного университета. Серия: Техника и технологии</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the Southwest State University. Series: Engineering and Technology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2223-1528</issn><publisher><publisher-name>Юго-Западный государственный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21869/2223-1528-2024-14-4-92-102</article-id><article-id custom-type="elpub" pub-id-type="custom">techusgu-290</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>ФИЗИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group></article-categories><title-group><article-title>Дипольное взаимодействие частиц в магнитной жидкости, стабилизированной двойным слоем ПАВ в воде</article-title><trans-title-group xml:lang="en"><trans-title>Dipole interaction of particles in magnetic fluid stabilized by a double layer of surfactant in water</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3989-7893</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лебедев</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Lebedev</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лебедев Александр Владимирович - доктор физико-математических наук, старший научный сотрудник лаборатории динамики дисперсных систем, ИМСС УрО РАН.</p><p>ул. Акад. Королёва, д. 1, Пермь 614013</p></bio><bio xml:lang="en"><p>Aleksandr V. Lebedev - Doctor of Sciences (Physics and Mathematics), Senior Researcher at the Laboratory of Disperse Systems Dynamics, Institute of Continuous Media Mechanics of the Ural Branch of the Russian Academy of Sciences, the affiliate of the Perm Federal Scientific Research Center.</p><p>1 Academician Korolev Str., Perm 614018</p></bio><email xlink:type="simple">lav@icmm.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт механики сплошных сред Уральского отделения Российской академии наук - филиал Федерального государственного бюджетного учреждения науки Пермского федерального исследовательского центра Уральского отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Continuous Media Mechanics of the Ural Branch of the Russian Academy of Sciences, the affiliate of the Perm Federal Scientific Research Center</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>13</day><month>12</month><year>2024</year></pub-date><volume>14</volume><issue>4</issue><fpage>92</fpage><lpage>102</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Лебедев А.В., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Лебедев А.В.</copyright-holder><copyright-holder xml:lang="en">Lebedev A.V.</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://techusgu.elpub.ru/jour/article/view/290">https://techusgu.elpub.ru/jour/article/view/290</self-uri><abstract><sec><title>Цель работы</title><p>Цель работы: изучить влияние межчастичных диполь-дипольных взаимодействий на восприимчивость магнитной жидкости, стабилизированной двойным слоем ПАВ в воде.</p><p>Метод исследования состоит в измерении начальной дифференциальной восприимчивости магнитной жидкости в зависимости от ее концентрации. Было исследовано три образца жидкости на основе частиц магнетита, отличающихся составом стабилизирующих оболочек. В качестве стабилизатора для первого слоя использовались кислоты: лауриновая (С12), декановая (С10) и октановая (С8). Второй слой стабилизирующей оболочки образовывал додецил сульфат натрия с небольшой долей соответствующей кислоты. Измерения восприимчивости выполнялись на установке для измерения кривых намагничивания. Концентрация образцов определялась по их намагниченности насыщения.</p></sec><sec><title>Результаты</title><p>Результаты. Измерены концентрационные зависимости начальной восприимчивости у трех образцов магнитной жидкости на основе частиц магнетита. Произведено сравнение полученных результатов с теорией модифицированного эффективного поля А.О. Иванова и среднесферической моделью. Обе теории предсказывают завышенные величины восприимчивости по отношению к экспериментальным значениям. Теория модифицированного эффективного поля завышает результаты на 20%, среднесферическая модель - на 12%. Показано, что корректная интерпретация концентрационной зависимости восприимчивости образцов магнитных жидкостей возможна только путем аппроксимации отношения восприимчивости к намагниченности насыщения. На основе этой аппроксимации для описания концентрационной зависимости восприимчивости предложена эмпирическая формула в виде полинома третьей степени с отрицательным кубическим слагаемым.</p></sec><sec><title>Вывод</title><p>Вывод. Таким образом, полученные результаты требуют построения новой или модификации старых теорий диполь-дипольного взаимодействия частиц магнетита в водных коллоидных растворах со стабилизацией частиц двойным слоем поверхностно-активного вещества.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Purpose of the work</title><p>Purpose of the work: to study the influence of interparticle dipole-dipole interactions on the susceptibility of a magnetic fluid stabilized by a double layer of surfactant in water.</p><p>Research method consists in measuring the initial differential susceptibility of a magnetic fluid depending on its concentration. Three samples of fluid based on magnetite particles, differing in the composition of the stabilizing shells, were studied. The following acids were used as the first layer of the stabilizer: lauric (C12), decanoic (C10) and octanoic (C8). The second layer of the stabilizing shell was formed by sodium dodecyl sulfate with a small proportion of the corresponding acid. Susceptibility measurements were performed on a setup for measuring magnetization curves. The concentration of the samples was determined by their saturation magnetization.</p></sec><sec><title>Results</title><p>Results. The concentration dependences of the initial susceptibility were measured for three samples of magnetic fluid based on magnetite particles. The obtained results were compared with theoretical models of the modified effective field of A.O. Ivanov and the average-spherical one. Both theories predict overestimated values of susceptibility in relation to experimental values. The modified effective field theory overestimates the results by 20%. The mean-spherical model - by 12%. It is shown that the correct interpretation of the concentration dependence of the susceptibility of magnetic fluid samples is possible only by approximating the ratio of susceptibility to saturation magnetization. Based on this approximation, an empirical formula in the form of a third-degree polynomial with a negative cubic term is proposed to describe the concentration dependence of susceptibility.</p></sec><sec><title>Conclusion</title><p>Conclusion. Thus, the obtained results require the construction of new or modification of old theories of dipole-dipole interaction of magnetic particles in aqueous colloidal solutions with stabilization of particles by a double layer of surfactant.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>магнитная жидкость</kwd><kwd>восприимчивость</kwd><kwd>диполь-дипольное взаимодействие</kwd><kwd>двойной слой</kwd><kwd>вода</kwd></kwd-group><kwd-group xml:lang="en"><kwd>magnetic fluid</kwd><kwd>susceptibility</kwd><kwd>dipole-dipole interaction</kwd><kwd>double surfactant layer</kwd><kwd>water</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа была выполнена за счет бюджетных средств Института механики сплошных сред УрО РАН в рамках бюджетной темы № AAAA-A20-120020690030-5.</funding-statement><funding-statement xml:lang="en">This work was supported by the budgetary funds of the Institute of Continuous Media Mechanics, Ural Branch, Russian Academy of Sciences, within the framework of state budgetary problem no. 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