Stamer Katerina S, Pigaleva Marina A, Pestrikova Anastasiya A, Nikolaev Alexander Y, Naumkin Alexander V, Abramchuk Sergei S, Sadykova Vera S, Kuvarina Anastasia E, Talanova Valeriya N, Gallyamov Marat O
Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory 1-2, 119991 Moscow, Russia.
A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova 28, 119334 Moscow, Russia.
Molecules. 2022 Oct 26;27(21):7261. doi: 10.3390/molecules27217261.
Methods for creating various 3D morphologies of composites based on chitosan and copper nanoparticles stabilized by it in carbonic acid solutions formed under high pressure of saturating CO were developed. This work includes a comprehensive analysis of the regularities of copper nanoparticles stabilization and reduction with chitosan, studied by IR and UV-vis spectroscopies, XPS, TEM and rheology. Chitosan can partially reduce Cu ions in aqueous solutions to small-sized, spherical copper nanoparticles with a low degree of polydispersity; the process is accompanied by the formation of an elastic polymer hydrogel. The resulting composites demonstrate antimicrobial activity against both fungi and bacteria. Exposing the hydrogels to the mixture of He or H gases and CO fluid under high pressure makes it possible to increase the porosity of hydrogels significantly, as well as decrease their pore size. Composite capsules show sufficient resistance to various conditions and reusable catalytic activity in the reduction of nitrobenzene to aniline reaction. The relative simplicity of the proposed method and at the same time its profound advantages (such as environmental friendliness, extra purity) indicate an interesting role of this study for various applications of materials based on chitosan and metals.
开发了基于壳聚糖和由其在饱和CO高压下形成的碳酸溶液中稳定的铜纳米颗粒来制备复合材料各种三维形态的方法。这项工作包括通过红外光谱和紫外可见光谱、X射线光电子能谱、透射电子显微镜和流变学对壳聚糖稳定和还原铜纳米颗粒的规律进行全面分析。壳聚糖可以将水溶液中的铜离子部分还原为小尺寸、低多分散度的球形铜纳米颗粒；该过程伴随着弹性聚合物水凝胶的形成。所得复合材料对真菌和细菌均表现出抗菌活性。在高压下将水凝胶暴露于He或H气体与CO流体的混合物中，可以显著增加水凝胶的孔隙率，并减小其孔径。复合胶囊在将硝基苯还原为苯胺的反应中表现出对各种条件的足够抗性和可重复使用的催化活性。所提出方法的相对简单性及其同时具有的显著优势（如环境友好、超高纯度）表明了本研究对于基于壳聚糖和金属的材料的各种应用具有重要意义。
