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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">10.21869/2223-1528-2023-13-4-123-138</article-id><article-id custom-type="elpub" pub-id-type="custom">techusgu-198</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>О характере влияния архитектуры молекул на теплофизические свойства изомеров алканов</article-title><trans-title-group xml:lang="en"><trans-title>On the Natyre of the Influence of the Architecture of Molecules on the Thermophisical Properties of Alkane Isomers</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8087-874X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Неручев</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Neruchev</surname><given-names>Yu. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Неручев Юрий Анатольевич, доктор физико-математических наук, профессор кафедры физики и нанотехнологий, научный руководитель научно-исследовательского центра физики конденсированного состояния</p><p>ул. Радищева, д. 33, г. Курск 305000</p></bio><bio xml:lang="en"><p>Yury A. Neruchev, Doctor of Sciences (Physics and Mathematics), Professor of the Department of Physics and Nanotechnology, Scientific Supervisor of the Research Center for Condensed Matter Physics</p><p>33 Radishcheva Str., Kursk 305000</p></bio><email xlink:type="simple">yuan2003@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5635-8149</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жакин</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhakin</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Жакин Анатолий Иванович, доктор физико- математических наук, профессор кафедры нанотехнологий, микроэлектроники, общей и прикладной физики</p><p>ул. 50 лет Октября, д. 94, г. Курск 305040</p></bio><bio xml:lang="en"><p>Anatoly I. Zhakin, Doctor of Sciences (Physics and Mathematics), Professor of the Department of Nanotechnology, Microelectronics, General and Applied Physics</p><p>50 Let Oktyabrya Str. 94, Kursk 305040</p></bio><email xlink:type="simple">zhakin@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-1120-8392</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Радченко</surname><given-names>А. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Radchenko</surname><given-names>A. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Радченко Антон Константинович, кандидат физико-математических наук, старший преподаватель кафедры физики и нанотехнологий</p><p>ул. Радищева, д. 33, г. Курск 305000</p></bio><bio xml:lang="en"><p>Anton K. Radchenko, Candidate of Sciences (Physical and Mathematical), Senior Lecturer of the Department of Physics and Nanotechnology</p><p>33 Radishcheva Str., Kursk 305000</p></bio><email xlink:type="simple">radchenko.antoshka@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-5626-6619</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шкурина</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Shkurina</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шкурина Валентина Анатольевна, старший преподаватель кафедры физики и нанотехнологий</p><p>ул. Радищева, д. 33, г. Курск 305000</p></bio><bio xml:lang="en"><p>Valentina A. Shkurina, Senior Lecturer of the Department of Physics and Nanotechnology</p><p>33 Radishcheva Str., Kursk 305000</p></bio><email xlink:type="simple">VS19942014@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Курский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kursk State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Юго-Западный государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Southwest State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>18</day><month>01</month><year>2024</year></pub-date><volume>13</volume><issue>4</issue><fpage>123</fpage><lpage>138</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Неручев Ю.А., Жакин А.И., Радченко А.К., Шкурина В.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Неручев Ю.А., Жакин А.И., Радченко А.К., Шкурина В.А.</copyright-holder><copyright-holder xml:lang="en">Neruchev Y.A., Zhakin A.I., Radchenko A.K., Shkurina V.A.</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/198">https://techusgu.elpub.ru/jour/article/view/198</self-uri><abstract><sec><title>Цель</title><p>Цель. Выполнение измерений скорости звука и плотности в жидкой фазе изомеров гексана на линии насыщения в широкой области параметров состояния, включающей критическую область.</p></sec><sec><title>Методы</title><p>Методы. Использование прецизионного импульсно-фазового метода измерения скорости звука в жидкой фазе изомеров гексана и их плотности пикнометром при атмосферном давлении. В работе обсуждаются результаты прецизионных измерений скорости звука и плотности в пяти изомерах гексана. Скорость звука измерена на кривой равновесия в жидкой фазе изомеров импульсно-фазовым методом в интервале от –30°С до их критической точки. Погрешность измерений скорости звука не превышала ±1 м/с. Измерения плотности выполнены с помощью пикнометра при атмосферном давлении в интервале от –30°С до их нормальной температуры кипения с погрешностью, не превышающей 0,05%. Результаты измерений скорости звука и плотности использованы для изучения особенностей характера межмолекулярных сил. Показана необходимость учета нековалентного химического взаимодействия молекул исследованных веществ.</p></sec><sec><title>Результаты</title><p>Результаты. Выполнены измерения скорости звука на линии насыщения в жидкой фазе всех пяти изомеров гексана в температурном интервале от –30°С до критической температуры всех 5 изомеров. Полученные результаты использованы для изучения особенностей зависимости энергии межмолекулярных сил от параметров состояния в области исследований.</p></sec><sec><title>Заключение</title><p>Заключение. Показано, что энергия межмолекулярных сил в предельных углеводородах и других простых веществах представляет собой сумму 3-х слагаемых, представляющих: 1) энергию дисперсионных сил притяжения, пропорциональную квадрату плотности; 2) энергию сил отталкивания, пропорциональную биквадрату плотности и 3) энергию слабых химических нековалентных сил связи, пропорциональную кубическому корню из плотности вещества.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Purpose</title><p>Purpose. Performing measurements of sound velocity and density in the liquid phase of hexane isomers on the saturation line in a wide range of state parameters, including the critical region.</p></sec><sec><title>Methods</title><p>Methods. Using a precision pulse-phase method for measuring the speed of sound in the liquid phase of hexane isomers and their density with a pycnometer at atmospheric pressure. The paper discusses the results of precision measurements of sound velocity and density in five hexane isomers. The speed of sound was measured on the equilibrium curve in the liquid phase of isomers by the pulse-phase method in the range from -30 to their critical point. The measurement error of the speed of sound did not exceed 1 m/s. Density measurements were performed using a pycnometer at atmospheric pressure in the range from -30 to their normal boiling point with an error not exceeding 0.05%. The results of sound velocity and density measurements were used to study the character of intermolecular forces. The necessity of taking into account the non-covalent chemical interaction of molecules of the studied substances is shown.</p></sec><sec><title>Results</title><p>Results. Sound velocity measurements were performed on the saturation line in the liquid phase of all five hexane isomers in the temperature range from -30 C to the critical temperature of all 5 isomers. The obtained results are used to study the features of the dependence of the energy of intermolecular forces on the parameters of the state in the field of research.</p></sec><sec><title>Conclusion</title><p>Conclusion. It is shown that the energy of intermolecular forces in marginal hydrocarbons and other simple substances is the sum of 3 terms representing: 1) the energy of the dispersive attractive forces proportional to the square of the density; 2) the energy of the repulsive forces proportional to the biquadrate of the density and 3) the energy of weak chemical non-covalent binding forces proportional to the cubic root of the density of matter.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>скорость звука</kwd><kwd>линия насыщения</kwd><kwd>изомеры</kwd><kwd>плотность</kwd><kwd>взаимодействие молекул</kwd></kwd-group><kwd-group xml:lang="en"><kwd>speed of sound</kwd><kwd>saturation line</kwd><kwd>isomers</kwd><kwd>density</kwd><kwd>interaction of molecules</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Cao K., Wu J., Lemmon E. W. 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