najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2026-17-2-210-217najo-1763Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХThe role of dehydration-hydration in the formation of nanoparticles with a chrysotile structure during hydrothermal treatment of Mg1−xNix(OH)2–SiO2–H2O(NaOH)systemsРоль дегидратации-гидратации в формировании наночастиц со структу рой хризотила при гидротермальной обработке систем Mg1-xNix(OH)2–SiO2–H2O(NaOH)https://orcid.org/0000-0002-6132-4178АльмяшеваО. В.AlmjashevaO. V.

Oksana V. Almjasheva 

almjasheva@mail.ruhttps://orcid.org/0000-0002-5817-5247КургузкинаМ. Е.KurguzkinaM. E.

Maria E. Kurguzkina 

https://orcid.org/0000-0003-4375-6388ГусаровВ. В.GusarovV. V.

Victor V. Gusarov 

NRC “Kurchatov Institute” – PNPI – IChS ; Saint-Petersburg Electrotechnical UniversityRussian FederationNRC “Kurchatov Institute” – PNPI – IChSRussian Federation202630042026172210217Copyright © Almjasheva O.V., Kurguzkina M.E., Gusarov V.V., 20262026Альмяшева О.В., Кургузкина М.Е., Гусаров В.В.Almjasheva O.V., Kurguzkina M.E., Gusarov V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1763

A thermodynamic analysis of hydroxide transformations in the Mg1−xNix(OH)2 – SiO2 – H2O system during the hydrothermal synthesis of nanotubular particles with a chrysotile structure has revealed the decisive role of the dehydration of initial reagents and the subsequent re-formation of hydroxides during hydrothermal treatment of reagents on the composition and morphological parameters of the target product. Depending on the composition of the hydroxide reagent and the T–P conditions in the reaction zone, three regions have been identified where the formation mechanism of nanotubular particles with a chrysotile structure changes dramatically. This is the direct cause of the non-monotonic dependence of the Mg/Ni ratio and the dimensional parameters of the (Mg1−xNix)3Si2O5(OH)4 nanotubes on the Mg/Ni ratio in the initial hydroxide.

Термодинамический анализ трансформаций гидроксидов в системе Mg1−xNix(OH)2–SiO2–H2O при гидротермальном синтезе нанотубулярных частиц со структурой хризотила показал решающую роль процессов их дегидратации и повторного образования гидроксидов в ходе гидротермальной обработки реагентов на состав и морфологические параметры целевого продукта. В зависимости от состава гидроксидного реагента и T–P-условий в реакционной среде зоне выделены три области, в которых резко изменяется механизм формирования нанотубулярных частиц со структурой хризотила, что и является непосредственной причиной немонотонной зависимости Mg/Ni соотношения и размерных параметров нанотрубок (Mg1-xNix)3Si2O5(OH)4 от Mg/Ni соотношения в исходном гидроксиде.

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The authors declare that there are no conflicts of interest present.