Promotionsvortrag Physik: Entropically driven self-assembly of pear-shaped nanoparticles

Jul 25
July 25, 2019 2:00 pm - 3:00 pm
SR 01.683 Theoretische Physik I, Department Physik, Staudtstr. 7, Erlangen

Einladung zum Promotionsvortrag von Philipp Schönhöfer:
„Entropically driven self-assembly of pear-shaped nanoparticles“

The ambition to mimic highly complex and functional nanostructures found in living organisms marks one of the pillars of today’s research in bio- and soft matter physics. Here, self-assembly, where small particles spontaneously form materials with long-range translational or orientational order, has evolved into a prominent strategy in nanostructure formation. Even though particle self-assembly has proven to be an effective tool for many complex structures, it is still a challenge to design particle properties such that, upon self-assembly, they self-organise into the desired target configuration. One of the key design parameters is the (effective) shape of the constituent particles. This thesis addresses the entropically driven colloidal self-assembly of pear-shaped particle ensembles, including the formation of structures based on triply periodic minimal surfaces (TPMS) such as the Gyroid.
Using computational simulations, we investigate the influence of minor variations in shape on the stability of the Gyroid phase. We show that the formation of the Gyroid reported earlier in the so-called pear hard Gaussian overlap (PHGO) approximation, is due to a slight non-additivity of that potential; this phase does not form in pears with true hard pear-shaped potential. In particular, the small differences in shape favours the formation of interdigitated bilayers in the PHGO particle ensemble, which is revealed as a unique collective mechanism to generate TPMS phases.
(Vortrag auf Englisch )

Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minuten.