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Polyethylene-Glycol-Mediated Self-Assembly of Magnetite Nanoparticles at the Liquid/Vapor Interface

TitlePolyethylene-Glycol-Mediated Self-Assembly of Magnetite Nanoparticles at the Liquid/Vapor Interface
Publication TypeJournal Article
Year of Publication2018
AuthorsVaknin, D, Wang, WJ, Islam, F, Zhang, HH
JournalAdvanced Materials Interfaces
Date Published03
Type of ArticleArticle
ISBN Number2196-7350
Accession NumberWOS:000428348800005
Keywordsaqueous biphasic systems, Biomedical applications, capped gold nanoparticles, chemistry, crystallization, dna, functionalization, future challenges, grazing-incidence X-ray diffraction at, iron-oxide, magnetitite nanoparticles, Materials Science, nanoparticle, nanoparticles, PEG-functionalized nanoparticles, salt, self-assembly, small angles (GISAXS), superlattices, x-ray reflectivity

It is shown that magnetite nanoparticles (MagNPs) grafted with polyethylene glycol (PEG) self-assemble and short-range-order as 2D films at surfaces of aqueous suspensions by manipulating salt concentrations. Synchrotron X-ray reflectivity and grazing-incidence small angle X-ray scattering studies reveal that K2CO3 induces the migration of the PEG-MagNPs to the liquid/vapor interface to form a Gibbs layer of monoparticle in thickness. As the salt concentration and/or nanoparticle concentration increase, the surface-adsorbed nanoparticles become more organized. And further increase in salt concentration leads to the growth of an additional incomplete nanoparticle layer contiguous to the first one at the vapor/liquid interface that remains intact.

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Short TitleAdv. Mater. Interfaces