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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">10.17586/2220-8054-2025-16-5-700-705</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-1541</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>Effect of labyrinth-like arrays formation of nickel nanorods on nickel surface as a result of galvanic substitution reaction in aqueous solutions of CuCl2 and NaCl mixture</article-title><trans-title-group xml:lang="ru"><trans-title>Эффект формирования лабиринтообразных массивов никелевых наностержней на поверхности никеля в результате реакции гальванического замещения в водных растворах смеси CuCl2 и NaCl</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3857-7238</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Толстой</surname><given-names>В. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Tolstoy</surname><given-names>V. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Валерий П. Толстой </p></bio><bio xml:lang="en"><p>Valeri P. Tolstoy</p><p>26, Peterhof, Saint Petersburg, 198504</p></bio><email xlink:type="simple">v.tolstoy@spbu.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/0009-0007-1409-5214</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Никитин</surname><given-names>К. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Nikitin</surname><given-names>K. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кирилл Д. Никитин </p></bio><bio xml:lang="en"><p>Kirill D. Nikitin</p><p>26, Peterhof, Saint Petersburg, 198504</p></bio><email xlink:type="simple">st069423@student.spbu.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/0000-0001-8264-2135</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Батищева</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Batischeva</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Елизавета В. Батищева </p></bio><bio xml:lang="en"><p>Elisaveta V. Batischeva</p><p>26, Peterhof, Saint Petersburg, 198504</p></bio><email xlink:type="simple">batischevaelisaveta@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Institute of Chemistry, St. Petersburg State University</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>05</day><month>11</month><year>2025</year></pub-date><volume>16</volume><issue>5</issue><fpage>700</fpage><lpage>705</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Tolstoy V.P., Nikitin K.D., Batischeva E.V., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Толстой В.П., Никитин К.Д., Батищева Е.В.</copyright-holder><copyright-holder xml:lang="en">Tolstoy V.P., Nikitin K.D., Batischeva E.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://nanojournal.ifmo.ru/jour/article/view/1541">https://nanojournal.ifmo.ru/jour/article/view/1541</self-uri><abstract><p>The article describes the nickel surface treatment conditions in aqueous solutions of a mixture of CuCl2 and NaCl salts. This investigation reveals the occurrence of selective etching on the nickel surface, facilitated by a galvanic replacement reaction (GRR). The etching process gives rise to the formation of arrays of labyrinths with walls of nickel nanorods with a diameter ranging from 10 to 50 nanometers and a length of up to 0.5 micrometers are formed, located primarily in the direction perpendicular to the surface. The experimental results obtained have enabled the formulation of hypotheses concerning the sequence of chemical reactions occurring on the surface and the role of the A. Turing diffusion-chemical model in the formation of the observed labyrinths. It has been demonstrated that the presence of such labyrinths on the surface of nickel leads to a decrease in the angles of its wetting with water.</p></abstract><trans-abstract xml:lang="ru"><p>В статье излагаются условия обработки поверхности никеля в водных растворах смеси солей CuCl2 и NaCl. В результате исследования впервые установлено наличие селективного травления поверхности никеля, обусловленного реакцией гальванического замещения (ГРЗ). В процессе травления формируются массивы лабиринтов со стенками из никелевых наностержней диаметром от 10 до 50 нанометров и длиной до 0,5 мкм, расположенных преимущественно в направлении, перпендикулярном поверхности. Полученные экспериментальные результаты позволили сформулировать гипотезы о последовательности химических реакций, протекающих на поверхности, и роли диффузионно-химической модели А. Тьюринга в формировании наблюдаемых лабиринтов. Показано, что наличие таких лабиринтов на поверхности никеля приводит к уменьшению углов его смачивания водой.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>никель</kwd><kwd>CuCl2</kwd><kwd>гальваническое замещение</kwd><kwd>наностержни</kwd><kwd>массивы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>nickel</kwd><kwd>CuCl2</kwd><kwd>galvanic replacement</kwd><kwd>nanorods</kwd><kwd>arrays</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was partly supported by the Russian Science Foundation (Grant No. 23-19-00566).</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">Reboul J., Li Z.-Y., Yuan J., Nakatsuka K., Saito M., Mori K., Yamashita H., Xia Y., Louis C. Synthesis of small Ni-core–Au-shell catalytic nanoparticles on TiO2 by galvanic replacement reaction. 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