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Versatile Phase Transfer of Gold Nanoparticles from Aqueous Media to Different Organic Media
Author(s) -
Karg Matthias,
Schelero Natascha,
Oppel Claudia,
Gradzielski Michael,
Hellweg Thomas,
von Klitzing Regine
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201003340
Subject(s) - alkyl , amphiphile , colloidal gold , phase (matter) , nanoparticle , materials science , dynamic light scattering , small angle x ray scattering , transmission electron microscopy , particle size , particle (ecology) , chemical engineering , aqueous two phase system , aqueous solution , hydrosol , plasmon , chemistry , analytical chemistry (journal) , nanotechnology , scattering , organic chemistry , copolymer , optics , polymer , composite material , physics , oceanography , optoelectronics , engineering , geology
A novel, simple, and very efficient method to prepare hydrophobically modified gold particles is presented. Gold nanoparticles of different sizes and polydispersities were prepared. The diameter of the gold particles ranges from 5 to 37 nm. All systems were prepared in aqueous solution stabilized by citrate and afterwards transferred into an organic phase by using amphiphilic alkylamine ligands with different alkyl chain lengths. The chain length was varied between 8 and 18 alkyl groups. Depending on the particle size and the alkylamine, different transfer efficiencies were obtained. In some cases, the phase transfer has a yield of about 100 %. After drying, the particles can be redispersed in different organic solvents. Characterization of the particles before and after transfer was performed by using UV/Vis spectroscopy, transmission electron microscopy (TEM), and small‐angle X‐ray scattering (SAXS) techniques. The effect of organic solvents with various refractive indices on the plasmon band position was investigated.