Aleksandr Lozhkomoev, Alexander Pervikov, Olga Bakina, Sergey Kazantsev, Irena Gotman
Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences Tomsk Russia
Department of Mechanical Engineering, ORT Braude College Karmiel Israel.
RSC Adv. 2018 Oct 25;8(63):36239-36244. doi: 10.1039/c8ra04173c. eCollection 2018 Oct 22.
The facile one-step synthesis of AlOOH-Ag nanocomposite has been performed. Bimetallic Al-Ag nanoparticles prepared by electrical explosion of Al and Ag wires were used as a precursor. AlAg nanoparticles consisted of a supersaturated Al-6 at% Ag solid solution and Ag-rich Guinier-Preston zone several nanometer in diameter that were not detected by XRD due to their extremely small size and peculiarities of their crystal structure. An environmentally friendly process of water oxidation at 60 C was used to convert Al-Ag nanoparticles into AlOOH-Ag nanocomposites. In the course of oxidation, chemical dealloying of Al-Ag solid solution took place yielding porous agglomerates with inclusions of very fine 5-30 nm Ag nanoparticles. The agglomerates consisted of 2-5 nm thick crumpled nanosheets of boehmite 200 nm in size. The synthesized AlOOH-Ag nanocomposites possessed high antibacterial activity against both Gram-negative and Gram-positive microorganisms as indicated by the time-kill assay. The presented results open up new processing possibilities of metal-oxide composite nanostructures with attractive properties that can be used in catalysis, water purification and biomedical applications.
已经实现了AlOOH-Ag纳米复合材料的简便一步合成。通过铝丝和银丝的电爆炸制备的双金属Al-Ag纳米颗粒用作前驱体。AlAg纳米颗粒由过饱和的Al-6 at% Ag固溶体和直径为几纳米的富Ag Guinier-Preston区组成，由于其尺寸极小和晶体结构的特殊性，XRD未检测到这些区域。采用在60℃下进行水氧化的环保工艺将Al-Ag纳米颗粒转化为AlOOH-Ag纳米复合材料。在氧化过程中，Al-Ag固溶体发生化学脱合金化，产生含有非常细的5-30 nm Ag纳米颗粒夹杂物的多孔团聚体。团聚体由尺寸为200 nm、厚度为2-5 nm的皱缩勃姆石纳米片组成。时间杀伤试验表明，合成的AlOOH-Ag纳米复合材料对革兰氏阴性和革兰氏阳性微生物均具有高抗菌活性。所呈现的结果为具有吸引人特性的金属氧化物复合纳米结构开辟了新的加工可能性，这些特性可用于催化、水净化和生物医学应用。
