细菌纤维素纳米金复合材料的制备

Synthesis of functionalized bacterial cellulose for preparing gold nanoparticles

将两步法非均相反应合成的偕胺肟基细菌纤维素(AOBC)同时用作还原剂和稳定剂在水热条件下直接与氯金酸反应,制备了负载纳米金的偕胺肟基细菌纤维素(AOBC/AuNPs)复合材料。通过红外、紫外、透射电镜、热重分析等手段对复合材料的结构和性能进行了分析和表征,讨论了细菌纤维素在碱液中的活化时间对纳米金制备的影响。结果表明,在活化时间小于8h时,随活化时间延长,负载在纤维素上的纳米金粒子的粒径逐渐变小;在活化时间达8h时,纳米金粒径最小且分布均匀;而当活化时间超过8h时,负载的纳米金粒径又增大。确定纤维素的最佳活化时间为8h。

A two-step synthesis of amidoxime bacterial cellulose （AOBC）, which could be used as both the reducing agent and stabilizer for preparation of gold nanoparticles （AuNPs） were investigated with FT-IR, UV-vis, and TEM for its structure, size distribution, morphology of the AOBC/AuNPs. TGA was used to analyze the gold particle content on the bacterial cellulose. It was found that the activated time of bacterial cellulose in NaOH solution had an important effect on the size and distribution of the obtained gold particles. With the increasing activated time in NaOH solution from 0.5 to 8 h, the size of the prepared gold particles was decreased and the size was uniform. The size of gold particles was increased when the activated time was longer than 8 h. Therefore, the optimum activated time of bacterial cellulose in NaOH solution was 8 h for preparing the gold nanoparticles.