Synthesis of Janus-like gold nanoparticles with hydrophilic/hydrophobic faces by surface ligand exchange and their self-assemblies in water

Langmuir : the ACS Journal of Surfaces and Colloids
Ryo IidaKuniharu Ijiro

Abstract

This study aims at the synthesis of Janus gold nanoparticles (Janus GNPs) with hydrophilic/hydrophobic faces by a simple ligand exchange reaction in an homogeneous system and at the elucidation of the self-assembled structures of the Janus GNPs in water. As hydrophilic surface ligands, we synthesized hexaethylene glycol (E6)-terminated thiolate ligands with C3, C7, or C11 alkyl chains, referred to as E6C3, E6C7, and E6C11, respectively. As a hydrophobic ligand, a butyl-headed thiolate ligand C4-E6C11, in which a C4 alkyl was introduced on the E6C11 terminus, was synthesized. The degree of segregation between the two ligands on the GNPs (5 nm in diameter) was examined by matrix-assisted laser desorption/ionization time-of fright mass spectrometry (MALDI-TOF MS) analysis. We found that the choice of immobilization methods, one-step or two-step addition of the two ligands to the GNP solution, crucially affects the degree of segregation. The two-step addition of a hydrophilic ligand (E6C3) followed by a hydrophobic ligand (C4-E6C11) produced a large degree of segregation on the GNPs, providing Janus-like GNPs. When dispersed in water, these Janus-like GNPs formed assemblies of ∼160 nm in diameter, whereas Domain GNPs, in which the ...Continue Reading

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Citations

Jan 5, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Svenja BouroneUlrich Simon
Mar 1, 2016·Journal of the American Chemical Society·Jinjian WeiKuniharu Ijiro
Feb 19, 2016·Chemical Communications : Chem Comm·Ana M PercebomLuis M Liz-Marzán
Jul 30, 2015·Angewandte Chemie·Sun Hae Ra ShinKyle J M Bishop
Nov 5, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Andrea TagliabueMassimo Mella
Mar 4, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Debdip BhandaryJayant K Singh
May 16, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Yu ToriiKuniharu Ijiro
Sep 3, 2017·European Biophysics Journal : EBJ·Paolo PengoPaola Posocco
Apr 10, 2018·Chemical Science·William EdwardsEuan R Kay
Jun 25, 2019·Chemical Communications : Chem Comm·Ke WangZhenzhong Yang
Mar 5, 2021·Journal of the American Chemical Society·Emma E CoughlinTeri W Odom
Apr 24, 2021·Topics in Current Chemistry·Hamed AkbarzadehAmir Nasser Shamkhali

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