摘要
由於黏土本身有電荷會與銀離子緊密結合，使得銀離子不易被釋放; 因此，本實驗選擇將銀離子還原成銀原子，得以有效釋放出銀離子達到抗菌效果。一般而言，奈米銀分散在高分子基材時，會有很嚴重的團聚現象; 在此以黏土做為載體，將奈米銀均勻分佈在黏土層間，使得每顆奈米銀都是有效接觸菌液，增加總表面積，減少銀的用量，更提昇抗菌能力。 本研究主要利用蒙脫土CL120，加入硝酸銀(AgNO3)當前驅物，將銀離子以離子交換反應插層至黏土層間，以還原劑硼氫化鈉(NaBH4)將銀離子還原成銀原子，製備出含銀黏土。利用廣角繞射分析儀(XRD)、熱失重分析儀(TGA) 、分光光度計(UV/VIS)來加以鑑定銀含量; 再以合成好之含銀黏土對革蘭氏陰性桿菌(大腸桿菌Escherichia col, E. coli)與革蘭氏陽性球菌(金黃色葡萄球菌Staphylococcus aureus subsp. Aureus, S. aureus)測試抗菌效果。 由實驗結果可知，本研究所製備出之含銀黏土只需重量百分比0.5wt％ 即可達到良好的抗菌效果；且含銀黏土與PMMA分散性良好，顯示其具有實際的應用價值，期望未來可應用於抗菌製品上。
並列摘要
Nano silver has the antibacterial capability, but it is not easy to be uniformly dispersed and causing the reduction of antibacterial effect due to the self-aggregation. For this reason, polymer or clay is usually used to be the carrier and specific interaction force is utilized to homogeneously disperse the nano silver into these carriers. Therefore, the silver nanoparticle can effectively contact the bacteria to enhance the antibacterial effect. In this study, Montmorillonite (CL120) and AgNO3 are applied as this carrier and precursor, respectively. Then, we utilize the ionic-change method to intercalate the nano silver into the multi-layer clay sheet. Next, the silver ion is reduced by the reluctant NaBH4 to generate the naon silver/clay. In component characterization, we utilize XRD, TGA and UV/VIS to identify the silver content and structure. In antibacterial characterization, we mix the nano silver/clay with E coli and S. aureus to evaluate its antibacterial performance. Finally, these experimental results conclude that the nano silver/clays only require the 0.5wt% of silver to achieve the excellent antibacterial capability. In addition, its dispersion quality with PMMA is good and the potential application in antibacterial products is promising.
參考文獻
延伸閱讀
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