Water Saturated with Pressurized CO 2 as a Tool to Create Various 3D Morphologies of Composites Based on Chitosan and Copper Nanoparticles

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 2 were developed. This work includes a comprehensive analysis of the regularities of copper nanoparticles stab...

Full description

Bibliographic Details
Published in:Molecules
Main Authors: Katerina S. Stamer, Marina A. Pigaleva, Anastasiya A. Pestrikova, Alexander Y. Nikolaev, Alexander V. Naumkin, Sergei S. Abramchuk, Vera S. Sadykova, Anastasia E. Kuvarina, Valeriya N. Talanova, Marat O. Gallyamov
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2022
Subjects:
porous hydrogels
capsules
reusable catalysts
nitrobenzene reduction
antimicrobial activity
Organic chemistry
QD241-441
Carbonic acid
Online Access:https://doi.org/10.3390/molecules27217261
https://doaj.org/article/b4c4201bf1184ebda0ab84bb484fbe99
Description
Summary: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 2 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 2+ 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 2 gases and CO 2 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.

Similar Items