Faculty of Physics, Lomonosov Moscow State University, Leninskie gory 1-2, Moscow 119991, Russian Federation.
Faculty of Physics, Lomonosov Moscow State University, Leninskie gory 1-2, Moscow 119991, Russian Federation; Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova 28, Moscow 119991, Russian Federation.
Carbohydr Polym. 2018 Jun 15;190:103-112. doi: 10.1016/j.carbpol.2018.02.076. Epub 2018 Feb 23.
Chitosan-based hydrogels with stabilized Ag nanoparticles were synthesized in the aqueous solutions of carbonic acid, i.e. water saturated with CO under pressure in hundreds of bars. Such a medium is biocompatible and self-neutralizing at decompression. The influence of various parameters, such as chitosan molecular weight, molar ratio of chitosan to silver, additional stabilization of gels by genipin as a cross-linking agent, on the structure of the chitosan/Ag composites was investigated using transmission electron microscopy, scanning electron microscopy, X-ray diffraction analysis, rheology measurements. The distributions of chitosan-stabilized Ag nanoparticles in a chitosan matrix turned out to be uniform, their average size was in the range of 2-5 nm. The higher degree of Ag nanoparticles reduction could be achieved using self-eliminating gaseous hydrogen as an additional reducing agent being admixed to CO. This was consistently confirmed by different research methods (TEM, XRDA, UV-vis spectroscopy).
在几百巴压力下二氧化碳饱和的水中合成了壳聚糖基水凝胶，其中稳定的银纳米颗粒。这种介质在减压时具有生物相容性和自中和性。使用透射电子显微镜、扫描电子显微镜、X 射线衍射分析和流变学测量等方法研究了壳聚糖分子量、壳聚糖与银的摩尔比、作为交联剂的京尼平对凝胶的额外稳定等各种参数对壳聚糖/Ag 复合材料结构的影响。结果表明，壳聚糖稳定的 Ag 纳米颗粒在壳聚糖基质中的分布均匀，平均尺寸在 2-5nm 范围内。使用自消除的气态氢作为额外的还原剂并混入 CO 中，可以实现更高程度的 Ag 纳米颗粒还原。这一点通过不同的研究方法（TEM、XRDA、UV-vis 光谱）得到了一致的证实。
