研究生: |
陳奕瑭 Chen, Yi-Tang |
---|---|
論文名稱: |
利用掠角X光散射及X光反射法研究加入雙極性分子對硫醇保護之金奈米粒子蘭慕爾-布羅吉單層膜的結構影響 Grazing-Incident X-ray Scattering and X-ray Reflectivity Studies on Mixed Langmuir-Blodgett Monolayers of Thiolated-Gold Nanoparticles and Amphiphilic Molecules |
指導教授: |
林滄浪
Lin, Tsang-Lang |
口試委員: |
蕭百沂
鄭有舜 |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 工程與系統科學系 Department of Engineering and System Science |
論文出版年: | 2011 |
畢業學年度: | 99 |
語文別: | 中文 |
論文頁數: | 101 |
中文關鍵詞: | X光略角小角度散射 、X光反射率 、奈米金顆粒 、雙極性分子 、蘭慕爾單層膜 |
相關次數: | 點閱:2 下載:0 |
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中文摘要
近年來奈米材料單層結構在各方面都有長足應用,本研究即以X-光散射法與穿透式電子顯微鏡分析奈米金顆粒混合介面活性劑或脂質體的蘭慕爾單層膜結構。化學還原法合成的奈米金顆粒分別以十六碳硫醇或八碳硫醇為保護劑。結果顯示十六碳硫醇包覆與八碳硫醇包覆的奈米顆粒的顆粒間距都會因為帶負電介面活性劑SDS的添加而變大但並不會因為表面壓力變化而改變。八碳硫醇包覆的顆粒之顆粒間距也會隨著脂質體的添加而變大。十六碳硫醇包覆的顆粒在液面上會形成規則平行四邊形的結構,而八碳硫醇包覆的奈米顆粒則隨機沒特定結構地在液面上排列。實驗結果發現雙電性的脂質體DPPC會與SDS競爭水面的空間,而負電性的脂質體DPPG因與SDS形成電性相斥而不易產生競爭或取代。本研究也發現當額外的八碳硫醇添加後,奈米顆粒單層膜會形成三維面心立方(0 0 1)方向垂直液面的奈米顆粒晶體結構。此外,由X-ray反射率得知,八碳硫醇保護的奈米顆粒能被脂質體單層膜支撐,並在脂質體單層膜上形成一層奈米金顆粒膜。
Abstract
Recently, forming a monolayer of nanomaterials is desired for a variety of application. We characterize the nanostructure of Langmuir monolayer of gold nanoparticles (AuNPs) mixed with amphiphilic molecules such as surfactants and lipids by X-ray scattering methods and transmission electron microscopy (TEM). The AuNPs are protected from fusing by hexadecanethiol (Au-16cthiol) or octanethiol (Au-8chtiol). The present results indicate that the interparticle spacing of Au-16chtiol and Au-8cthiol increase while additional anionic surfactant sodium dodecyl sulfate (SDS) was added, but does not alter as increasing surface pressure. The interparticle spacing also increases in Au-8cthiol system by adding lipids. The experimental results indicate that nanoparticles were ordered-packing like “parallelogram” in Au-16cthiol system, but packing randomly in Au-8cthiol system. Besides, the results show that zwitterionic 1,2-dihexadecanoyl-sn-glycero-3-phosphocholine (DPPC) molecules compete for surface site with SDS while anionic 1,2-dihexadecanoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (DPPG) molecules compete with SDS not easily due to the electrical repulsion. Furthermore, we also reveal that the AuNPs can form a nanocrystal of (0 0 1) oriented FCC lattice at the air-water interface by mixing with the additional octanethiol. Besides, the thiolated gold nanoparticle monolayer is supported by the lipid monolayer. X-ray reflectivity could reveal the detail structure of such complex monolayers.
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