新型机械化学配体交换法制备单畴磁性CoFe2O4纳米粒子
Transforming Single Domain Magnetic CoFe2O4 Nanoparticles from Hydrophobic to Hydrophilic By Novel Mechanochemical Ligand Exchange
摘要：
以油酸为表面活性剂，采用水热法合成了单相、粒径均匀（约9 nm）的钴铁氧体（CFO）纳米粒子。所合成的油酸包覆的CFO（OA-CFO）纳米粒子在非极性溶剂中分散性良好，但在水中不分散。OA-CFO纳米颗粒已经成功地转化为高度水分散性的柠檬酸包覆的CFO（CA-CFO）纳米颗粒，使用一种新的单步配体交换过程，通过机械化学研磨，其中小链柠檬酸分子取代CFO纳米颗粒上可用的原始大链油酸分子。接触角测量表明，OA-CFO纳米颗粒是疏水性的，而CA-CFO纳米颗粒是超亲水性的。已经证明了合成的OA-CFO和机械化学转化的CA-CFO纳米颗粒用于高度稳定的油包水和水包油乳液的破乳的潜力。
英文摘要：
Single phase, uniform size (~9 nm) Cobalt Ferrite (CFO) nanoparticles have been synthesized by hydrothermal synthesis using oleic acid as a surfactant. The as synthesized oleic acid coated CFO (OA-CFO) nanoparticles were well dispersible in nonpolar solvents but not dispersible in water. The OA-CFO nanoparticles have been successfully transformed to highly water dispersible citric acid coated CFO (CA-CFO) nanoparticles using a novel single step ligand exchange process by mechanochemical milling, in which small chain citric acid molecules replace the original large chain oleic acid molecules available on CFO nanoparticles. The contact angle measurement shows that OA-CFO nanoparticles are hydrophobic whereas CA-CFO nanoparticles are superhydrophilic in nature. The potentiality of as synthesized OA-CFO and mechanochemically transformed CA-CFO nanoparticles for the demulsification of highly stabilized water-in-oil and oil-in-water emulsions has been demonstrated.
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