Enabling the synthesis of homogeneous or Janus hairy nanoparticles through surface photoactivation

Nanoscale
Nicolò RazzaMarco Sangermano

Abstract

Nanoparticles (NPs) homogeneously covered with polymer chains or with chains of two different polymers segregated in distinct domains ("Janus" particles) possess remarkable features. Their unique colloidal properties can be finely tuned by the grafted polymers while the characteristics of the nano-core remain unaffected. Herein, a simple and robust photochemical approach is reported to synthesize, from 50 nm cores, homogeneous and Janus "hairy" nanoparticles with hydrophilic and amphiphilic properties, respectively. This is achieved by using a surface-anchored bis(acyl)phosphane oxide photoinitiator which allows a spatially controlled surface-initiated photopolymerization at room temperature. Homogeneous and Janus hairy nanoparticles dispersed in water have very different interaction behaviours which are directly visualized by in situ liquid cell transmission electron microscopy and confirmed by small angle X-ray scattering from a statistically relevant number of particles.

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Citations

Jun 25, 2019·Chemical Communications : Chem Comm·Ke WangZhenzhong Yang
Dec 8, 2020·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Sana AzimR J Dwayne Miller
Mar 4, 2020·ACS Central Science·Tatiana I MorozovaRodney D Priestley

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Methods Mentioned

BETA
transmission electron microscopy
X-ray
coherent
coherent differential scattering

Software Mentioned

LTEM

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