State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
Carbohydr Polym. 2013 Jun 5;95(1):214-9. doi: 10.1016/j.carbpol.2013.02.077. Epub 2013 Mar 7.
In this study, we report a facile and environmentally friendly strategy for synthesis of well dispersed and stable silver nanostructures using cellulose nanocrystals in aqueous solution without employing any other reductants, capping or dispersing agents. Importantly, it is feasible to adjust the morphology of the silver nanostructures by varying the precursor AgNO3 concentration. Silver nanospheres were formed when the AgNO3 concentration was 0.4 mM, while the dendritic nanostructures predominated when the AgNO3 concentration was increased to 250 mM. The antibacterial activity of the two different silver nanostructures against Escherichia coli and Staphylococcus aureus was characterized. Dendritic nanostructure showed a better antibacterial activity than that of silver nanosphere. The approach presented in this paper offers a very promising route to noble metal nanoparticles using renewable reducing agents.
在这项研究中，我们报告了一种简便且环保的策略，使用纤维素纳米晶体在水溶液中合成分散良好且稳定的银纳米结构，而无需使用任何其他还原剂、封端剂或分散剂。重要的是，可以通过改变前驱体 AgNO3 浓度来调整银纳米结构的形态。当 AgNO3 浓度为 0.4 mM 时，形成银纳米球，而当 AgNO3 浓度增加到 250 mM 时，枝状纳米结构占主导地位。对两种不同的银纳米结构对大肠杆菌和金黄色葡萄球菌的抗菌活性进行了表征。枝状纳米结构的抗菌活性优于银纳米球。本文提出的方法为使用可再生还原剂制备贵金属纳米粒子提供了一条很有前途的途径。
