title: Conversion of the surface property of oleic acid stabilized silver nanoparticles from hydrophobic to hydrophilic based on host-guest binding interaction.
abstract: This paper describes a general method to change the surface property of the oleic acid stabilized silver nanoparticles and successful tranferring of the silver nanoparticles from the organic phase into the aqueous phase. By vigorous shaking of a biphasic mixture of the silver organosol protected with oleic acid and p-sulfonated calix[4]arene (pSC4) aqueous solution, it is believed that an inclusion complex is formed between oleic acid molecules and pSC4, and the protective layer of the silver nanoparticles shifts from hydrophobic to hydrophilic in nature, which drives the transfer of silver nanoparticles from the organic phase into the aqueous phase. The efficiency of the phase transfer to the aqueous solution depends on the initial pSC4 concentration. The pSC4-oleic acid inclusion complex stabilized nanoparticles can be stable for long periods of time in aqueous phase under ambient atmospheric conditions. The procedure of phase transfer has been independently verified by UV-vis, transmission electron microscopy, Fourier transform infrared, and 1H nuclear magnetic resonance techniques.
authors.affiliation: College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Peoples Republic of China.
authors.forename: Ming
authors.initials: M
authors.lastname: Chen
authors.forename: Wenhua
authors.initials: W
authors.lastname: Ding
authors.forename: Yang
authors.initials: Y
authors.lastname: Kong
authors.forename: Guowang
authors.initials: G
authors.lastname: Diao
mesh_terms: D047250:Calixarenes; D057927:Hydrophobic and Hydrophilic Interactions; D053768:Metal Nanoparticles / Q000737:chemistry*; D019301:Oleic Acid; D010636:Phenols; D012834:Silver; D013057:Spectrum Analysis; D013499:Surface Properties
chemical_list: D010636:Phenols; C121325:calix(4)arene; D047250:Calixarenes; D019301:Oleic Acid; D012834:Silver