Kazantsev Sergey O, Bakina Olga V, Pervikov Aleksandr V, Rodkevich Nikolay G, Quang Nguyen Hong, Le Thi Lan Anh, Timofeev Sergei S, Lozhkomoev Aleksandr S
Laboratory of Nanobioengineering, Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Pr. Akademicheskii 2/4, 634055 Tomsk, Russia.
Laboratory of Physical Chemistry of Ultrafine Materials, Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Pr. Akademicheskii 2/4, 634055 Tomsk, Russia.
Nanomaterials (Basel). 2022 Nov 3;12(21):3888. doi: 10.3390/nano12213888.
The water oxidation of bimetallic Al/Ag nanoparticles has been shown to yield nanoscale structures whose morphology, phase composition and textural characteristics are determined by the synthesis conditions. Flower-like nanoscale structures with silver nanoparticles, with an average size of 17 nm, are formed in water at 60 °C. Under hydrothermal conditions at temperatures of 200 °C and a pressure of 16 MPa, boehmite nanoplatelets with silver nanoparticles, with an average size of 22 nm, are formed. The oxidation of Al/Ag nanoparticles using humid air at 60 °C and 80% relative humidity results in the formation of rod-shaped bayerite nanoparticles and Ag nanoparticles with an average size of 19 nm. The thermal treatment of nanoscale structures obtained at a temperature of 500 °C has been shown to lead to a phase transition into γ-AlO, while maintaining the original morphology, and to a decrease in the average size of the silver nanoparticles to 12 nm and their migration to the surface of nanoscale structures. The migration of silver to the nanoparticle surface influences the formation of a double electric layer of particles, and leads to a shift in the pH of the zero-charge point by approximately one, with the nanostructures acquiring pronounced antimicrobial properties.
双金属铝/银纳米颗粒的水氧化反应已被证明会产生纳米级结构，其形态、相组成和织构特征由合成条件决定。在60℃的水中形成了具有平均尺寸为17nm的银纳米颗粒的花状纳米级结构。在200℃温度和16MPa压力的水热条件下，形成了具有平均尺寸为22nm的银纳米颗粒的勃姆石纳米片。在60℃和80%相对湿度下使用潮湿空气对铝/银纳米颗粒进行氧化，会形成棒状拜耳石纳米颗粒和平均尺寸为19nm的银纳米颗粒。已表明在500℃温度下对所得纳米级结构进行热处理会导致向γ - AlO的相变，同时保持原始形态，并使银纳米颗粒的平均尺寸减小到12nm，且它们迁移到纳米级结构的表面。银向纳米颗粒表面的迁移影响颗粒双电层的形成，并导致零电荷点的pH值偏移约一个单位，纳米结构具有显著的抗菌性能。
