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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">10.17586/2220-8054-2026-17-4-462-469</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-1908</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>PHYSICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group></article-categories><title-group><article-title>On the validity of 2D reduction of the Fournier-Galatola planar anchoring model for polymer-dispersed nematic liquid crystals</article-title><trans-title-group xml:lang="ru"><trans-title>О корректности сведения трёхмерной модели планарного сцепления Фурнье-Галатолы к двумерной модели для полимерно-дисперсных нематических жидких кристаллов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3264-7792</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чимытов</surname><given-names>Т.</given-names></name><name name-style="western" xml:lang="en"><surname>Chimytov</surname><given-names>T. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Timur A. Chimytov</p><p>Smolin, 24a, Ulan-Ude, 670000; Ulan-Ude, 670047</p><p> </p></bio><email xlink:type="simple">tchimytov@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Banzarov Buryat State University; &#13;
Institute of Physical Materials Science, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>31</day><month>08</month><year>2026</year></pub-date><volume>17</volume><issue>4</issue><fpage>462</fpage><lpage>469</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Chimytov T.A., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Чимытов Т.</copyright-holder><copyright-holder xml:lang="en">Chimytov T.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://nanojournal.ifmo.ru/jour/article/view/1908">https://nanojournal.ifmo.ru/jour/article/view/1908</self-uri><abstract><p>The validity of directly reducing the three-dimensional Fournier-Galatola model of planar anchor- ing to two-dimensional nematic systems is investigated analytically and numerically. An alternative two- dimensional formulation based on a direct target surface Q-tensor is introduced for comparison. Analytical calculations reveal that the reduced Fournier-Galatola functional yields a cubic restoring torque at the poles of an elliptical droplet, whereas the direct tensor formulation preserves a linear response along the entire boundary. The influence of this difference on orientational relaxation is studied using the Landau-de Gennes simulations of mesoscale elliptical 5CB droplets. The reduced Fournier–Galatola model is shown to enhance boojum mobility, alter the final bipolar orientation at moderate aspect ratios, and systematically predict lower equilibrium energies. The results indicate that direct projection-based reduction can lead to qualitatively differ- ent relaxation scenarios in two-dimensional nematic models.</p></abstract><trans-abstract xml:lang="ru"><p>Аналитически и численно исследована корректность прямого сведения трехмерной модели планарного сцепления Фурнье-Галатола к двумерным нематическим системам. Для сравнения предложена альтернативная двумерная формулировка, основанная на непосредственном задании целевого поверхностного Q-тензора. Аналитические расчеты показывают, что редуцированный функционал Фурнье-Галатола приводит к кубическому восстанавливающему моменту на полюсах эллиптической капли, тогда как модель с непосредственным заданием целевого тензора сохраняет линейный отклик вдоль всей границы. Влияние этого различия на релаксацию ориентационной структуры исследовано с использованием модели Ландау-де Жена для мезоскопических эллиптических капель нематика 5ЦБ. Показано, что редуцированная модель Фурнье-Галатола приводит к повышенной подвижности буджумов, изменяет конечную ориентацию биполярной структуры при умеренных значениях отношения полуосей и систематически предсказывает более низкие равновесные значения свободной энергии. Полученные результаты свидетельствуют о том, что непосредственное проекционное сведение может приводить к качественно различным сценариям релаксации в двумерных моделях нематиков.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>биполярная структура</kwd><kwd>планарное сцепление</kwd><kwd>Q-тензор</kwd><kwd>буджумы</kwd><kwd>мезоскопические нематические капли</kwd></kwd-group><kwd-group xml:lang="en"><kwd>bipolar structure</kwd><kwd>planar anchoring</kwd><kwd>Q-tensor</kwd><kwd>boojums</kwd><kwd>mesoscale nematic droplets</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">Agarwal S., Srivastava S., Joshi S., Tripathi S., Singh B.P., Pandey K.K., Manohar R.A Comprehensive Review on Polymer-Dispersed Liquid Crystals: Mechanisms, Materials, and Applications. ACS Mater. 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