Production Control and Characterization of Bilayer-Surfactant Coated Stable Water-Soluble Monodisperse Magnetic Iron Oxide Nanoparticle

雙層界面活性劑包覆之單一分佈磁性奈米粒子的製備與膠體穩定性控制

陳志榮(Chih-Jung Chen) ； 賴新一(Hsin-Yi Lai)

《中國機械工程學刊》 29卷6期 (2008/12) Pp. 457-465

https://doi.org/10.29979/JCSME.200812.0003

摘要

本文首次使用油酸氨進行油基之單一分佈磁性奈米粒子的表面改質，經由微乳化法的方式製備具高膠體穩定性之水基磁性流體。油基單一分佈磁性奈米粒子是經由高溫熱裂解的方式進行製作，過程主要是以赤鐵礦粉體做為起始反應物於油酸與十八烯的混合溶液中進行高溫熱裂解反應，經由控制溶解與析出反應可獲得單一分佈磁性奈米粒子。穿遂式電子顯微鏡、熱重分析儀、紅外光譜儀被使用以觀察粒子於改質前後的幾何形態與表面結構的差異。動態光散射儀被用以量測水基磁性粒子於不同溶液酸鹼值與離子強度中的流體力學直徑與膠體穩定性。DLVO理論被用以預估與了解膠體穩定的機制。結果顯示粒子可穩定於溶液酸鹼值大於7或離子濃度小於0.2M的狀態。

並列摘要

Ammonia-oleate is used in this paper as surface modification agent to coat oil-based monodisperse magnetic iron oxide nanoparticles (MMIONPs) in water-soluble bilayer-stabilized MMIONPs by microemulsion method. The oleate-coated MMIONPs are made of thermal decomposition of submicrometer hematite powder in oleic acid and 1-octadence mixture via controlled dissolutionrecrystallization process. Transmission electron microcopy (TEM), Thermogravimetric analyzer (TGA) and Fourier transformation-infrared (FTIR) spectroscopy are used in the process to characterize product samples before and after modification processes. The colloidal stability of bilayer-stabilized MMIONPs in various pH values of solvents and salt concentration was elaborated characterized by the dynamic light scattering (DLS) technique. The DLVO theory is also used for qualitative characterization on the colloidal stability of bilayer-coated MMIONPs in various conditions. The experimental data indicates that the bilayer-coated MMIONPs thus obtained with low concentration to aggregate was initially at the pH value less than 7, and salt concentration over 0.2M. Also, the testing results are found satisfactory.

並列關鍵字

monodisperse magnetic nanoparticles ； bilayer surfactant method ； water based ferrofluids ； colloidal stability