Reversible Supracolloidal Self-Assembly of Cobalt Nanoparticles to Hollow Capsids and Their Superstructures
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2017
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en
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Angewandte Chemie, Volume 56, issue 23, pp. 6473–6477
Abstract
The synthesis and spontaneous, reversible supracolloidal hydrogen bond-driven self-assembly of cobalt nanoparticles (CoNPs) into hollow shell-like capsids and their directed assembly to higher order superstructures is presented. CoNPs and capsids form in one step upon mixing dicobalt octacarbonyl (Co2CO8) and p-aminobenzoic acid (pABA) in 1,2-dichlorobenzene using heating-up synthesis without additional catalysts or stabilizers. This leads to pABA capped CoNPs (core ca. 5nm) with a narrow size distribution. They spontaneously assemble into tunable spherical capsids (d≈50-200nm) with a few-layered shells, as driven by inter-nanoparticle hydrogen bonds thus warranting supracolloidal self-assembly. The capsids can be reversibly disassembled and reassembled by controlling the hydrogen bonds upon heating or solvent exchanges. The superparamagnetic nature of CoNPs allows magnetic-field-directed self-assembly of capsids to capsid chains due to an interplay of induced dipoles and inter-capsid hydrogen bonds. Finally, self-assembly on air-water interface furnishes lightweight colloidal framework films.Description
| openaire: EC/FP7/291364/EU//MIMEFUN
Keywords
Capsids, Colloidal self-assembly, Electron tomography, Hydrogen bonding, Magnetic nanoparticles
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Citation
Nonappa, N, Haataja, J S, Timonen, J V I, Malola, S, Engelhardt, P, Houbenov, N, Lahtinen, M, Häkkinen, H & Ikkala, O 2017, ' Reversible Supracolloidal Self-Assembly of Cobalt Nanoparticles to Hollow Capsids and Their Superstructures ', Angewandte Chemie, vol. 56, no. 23, pp. 6473–6477 . https://doi.org/10.1002/anie.201701135