銀鑲嵌氧化鋁矽奈米複合結構之退火及抗菌特性研究

Silver-Embedded on Aluminum/Silica Nanocomposite:Annealing and Antibacterial Properties

陳鼎鈞(Ding-Jun Chen) ； 施漢章(Han C. Shih)

《華岡工程學報》 29期 (2012/06) Pp. 1-7

https://doi.org/10.29987/CCUHKJE.201206.0001

摘要

本研究成功將銀奈米粒子與銀離子在經過溶凝膠法（sol-gel）反應之後均勻嵌載氧化矽鋁的非晶結構表面及內部，其中鋁原子的導入扮演關鍵性的角色，為銀離子（Ag(上標 +)）均勻分佈在整體二氧化矽載體的主要原因。〔AlO（下標 4）〕（上標 -）四面體結構和Ag（上標 +）的交互作用導致Ag（上標 +）藉著庫倫靜電力散佈在主體結構，進而完整呈現Ag（上標 +）嵌載在Al-O-Si鍵結狀態的結構。擁有此特殊結構的樣品之後經由氧氣氣氛的退火處理保持溫度範圍區間介於250-1000℃。銀原子和一價銀離子在表面的比例是不斷隨著退火條件而改變，原則上可劃分成三階段演變態，低溫銀粒子率先還原在表面，當溫度漸升銀原子滿足離子化條件隨即轉換成離子態，更高溫甚至可能有液化與脫落的現象發生。在未退火前30℃的氧化矽鋁奈米微球展現出最適合做為抗菌材料的性質，優點具有良好化學耐久性，抗菌能力符合高標準，還有潔白的外觀感受。退火後的樣品雖不具有特別吸引人的抗菌顏色外貌，最終卻發現銀的熱穩定性變化趨向。這些結果顯示本研究在生醫材料領域具有前瞻性的發展潛力。

並列摘要

In this study, we have successfully prepared an ionic silver(Ag(superscript +)) uniformly incorporated into amorphous silica/aluminum framework and silver nanoparticles was embedded on its surface by sol-gel process, which introduce controlled Al atoms to play a significant role in overall Silica matrix. It attributed that the premier reason for silver ions uniformly distribute in entity of silica carrier. The interaction between [AlO(subscript 4)]( superscript -) tetrahedral structure and Ag(superscript +) result in uniform Ag(superscript +) distribution in matrix by electrostatic force, and then Ag+ embedded Al-O-Si structure is revealed. The Ag(superscript +) embedded Al-O-Si structure was then annealed in O(subscript 2) atmosphere range from the temperature 250℃ to 1000℃. The surface composition ratio of silver atoms and monovalent silver ions were changed with annealed condition constantly, which could divide into the three steps transition. Silver nanoparticles reduced on the surface at lower temperature initially. As temperature gradually increased, silver atoms immediately fulfilled ionization requirement with transforming to the ionic state. Furthermore, it might take place melting and desquamation at higher temperature. The sample A before annealing at 30℃ emerges the most desirable property as an antibacterial material. The advantages possess chemical durability, high standard antibacterial ability and colorless appearance. Thought the samples after annealing do not include appealing color, the evolution of silver thermal stability are eventually found out. These consequences present prospective development in biomaterial.