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Colloidal Self-Assembly Enlightened by Synchrotron Radiation - Andrei V. Petukhov

van ’t Hoff laboratory for physical & colloid chemistry

Colloids are able to self-assemble into various structures with periodicity on the scales ranging from nanometres to about a micron. They are widely recognized as an important model system to study freezing, melting and solid-solid phase transitions, jamming and glass formation. In addition, colloidal crystals are attractive for multiple applications since they can be used as templates to fabricate novel materials with unique optical properties, for 2D ultrafast electronics, for catalysts, and sensorics. The ability to tune colloid self-assembly is the key to achive structures of desired symmetry and quality.
After a short general introduction into the topic, I shall present a few recent examples of tuning collodal self-assmbly by varying particle shape or using confinement and dipole interactions, which we study using advanced synchrotron techniques [1]. I shall discuss the self-assembly of magnetic and non-magnetic cubic colloids with rounded edges [2,3]. In-situ studies of the self-ogranization of semiconductor quantum dots at a liquid interface [4,5] will be illustrated. I shall describe our recent time-resolved study of the formation of microtubes [6,7], which we use as templates for the fabrication of chiral colloids [8,9]. Finally, if time allows, I shall briefly present our recent study of the structure of the shared-solvent interface between polymer-rich and colloid-rich phases [10].

References :
[1] A.V. Petukhov et al., Curr. Opin. Coll. & Interf. Sci. 20 (2015) 272.
[2] J.-M. Meijer et al., Nature Commun., 8 (2017) 14352.
[3] L. Rossi et al., Soft Matter, 14 (2018) 1080.
[4] M.P. Boneschanscher et al., Science, 344 (2014) 1377.
[5] J. Geuchies et al., Nature Materials, 15 (2016) 1248.
[6] S. Ouhajji et al., Soft Matter, 13 (2017) 2421.
[7] J. Landman et al., Science Advances, 4 (2018) eaat1817.
[8] L. Jiang et al., Angew. Chemie, 52 (2013) 3364.
[9] S. Ouhajji et al., ACS Nano, 12 (2018) 12089.
[10] M. Vis et al, to be published.


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