Light-induced reversible hydrophobization of cationic gold nanoparticles via electrostatic adsorption of a photoacid

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-08-01
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Language
en
Pages
5
14118-14122
Series
Nanoscale, Volume 11, issue 30
Abstract
The ability to switch the hydrophilicity/hydrophobicity of nanoparticles promises great potential for applications. Here we report a generic approach that allows hydrophobization of cationic surfaces by light-induced photoacid switching from the unbound zwitterionic form to the electrostatically bound anionic form. Importantly, this allows reversible assembly and disassembly of cationic AuNPs, with disassembly kinetics controlled by temperature. The AuNPs can be repeatedly transferred between aqueous and non-polar solvents using light, showing potential in purification processes. In the macroscopic scale, nontrivially, light triggers the in situ hydrophobization of a flat cationized gold surface. The current approach is generic and opens up a new way to control the surface properties and self-assembly of nanoparticles.
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| openaire: EC/H2020/725513/EU//SuperRepel | openaire: EC/H2020/742829/EU//DRIVEN
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Citation
Zhang, H, Muhammad, J, Liu, K, Ras, R H A & Ikkala, O 2019, ' Light-induced reversible hydrophobization of cationic gold nanoparticles via electrostatic adsorption of a photoacid ', Nanoscale, vol. 11, no. 30, pp. 14118-14122 . https://doi.org/10.1039/c9nr05416b