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利用新型表面活性剂4-十二烷氧基苄胺(C12OBA)构成的C12OBA/正庚烷/正丁醇/HAuCl4/NaOH(aq.)W/O型微乳液作为微反应器,通过微波辐射加热的正丁醇原位还原法制备了C12OBA包裹的憎水性金纳米粒子,并通过紫外可见光谱(UV-vis)、透射电镜(TEM)、X射线衍射(XRD)、红外光谱(FT-IR)和接触角(CA)等分别进行了表征和分析.结果显示,C12OBA既可参与形成稳定的W/O型微乳液,又可作为金粒子的良好保护剂.微乳液内核中碱度的增加能增强位于膜相的正丁醇分子的还原能力.在固定氯金酸用量时,C12OBA/金的物质的量比增加有利于获得小尺寸、高单分散性的憎水性纳米金颗粒,而体系的极性增加则导致金粒子的尺寸增大、单分散性下降.通过本实验方法可方便快速地合成尺寸约为5nm的具有高度单分散的憎水性金纳米粒子.
C12OBA / n-heptane / n-butanol / HAuCl4 / NaOH (aq.) W / O type microemulsion composed of novel surfactant 4-dodecyloxybenzylamine (C12OBA) was used as a microreactor. Hydrophobic gold nanoparticles coated with C12OBA were prepared by heated n-butanol in situ reduction method and characterized by UV-vis, TEM, XRD, FT-IR ) And contact angle (CA) were measured and the results showed that C12OBA could participate in the formation of a stable W / O microemulsion and also as a good protective agent of gold particles.The increase of alkalinity in the microemulsion core Can enhance the reduction ability of n-butanol molecules located in the membrane phase.When the amount of chloroauric acid is fixed, the increase of the amount ratio of C12OBA / gold is conducive to obtaining small size and highly monodisperse hydrophobic nano gold particles, and the system Increases the size of the gold particles and decreases the monodispersity, which makes it possible to synthesize highly monodisperse hydrophobic gold nanoparticles with a size of about 5 nm conveniently and rapidly.