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Effect of the Alkyl Chain Length of Secondary Amines on the Phase Transfer of Gold Nanoparticles from Water to Toluene
In
the present paper we describe a phase transfer of aqueous synthesized
gold nanoparticles (AuNPs) from water to toluene using secondary amines:
dioctylamine, didodecylamine, and dioctadecylamine. The effect of
the hydrocarbon chain length and amount of amines on the transfer
efficiency were investigated in the case of nanoparticles (NPs) with
three different sizes: 5, 9, and 13 nm. Aqueous colloids were precisely
characterized before the transfer process using UV–vis spectroscopy,
dynamic light scattering (DLS), small-angle X-ray scattering (SAXS),
and transmission electron microscopy (TEM). Nanoparticles were next
transferred to toluene and characterized using UV–vis and DLS
techniques. It was found that dioctadecylamine provides the most effective
transfer of nanoparticles. No time-dependent changes in the NP size
were observed after 12 days, showing that the dioctadecylamine-stabilized
nanoparticles dispersed in toluene were stable. This indicates that
long hydrocarbon chains of dioctadecylamine exhibit sufficiently hydrophobic
properties of nanoparticles and consequently their good dispersibility
in nonpolar solvent