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Heterogeneously charged colloids for functional materials

SLAM Seminar

Date: Thursday, November 4, 2021 11:00 - 12:00
Speaker: Emanuela Bianchi (Technische Universitat Wien)
Location: Heinzel Seminar Room / Office Bldg West (I21.EG.101)
Series: Physical Sciences Seminar
Host: Jérémie Palacci
Contact: PETZ Caroline

Heterogeneously charged colloids are promising building blocks for the self-assembly of target structures with specific properties at the nano- and micro-scale. Thanks to the interplay between orientation-dependent attraction and repulsion -- induced by the interactions between like/oppositely charged regions on the particle surface --  experimentally accessible surface patterns are complex enough to favor the formation and/or stabilization of specific structures of interest. 

Using state-of-the-art computational techniques and appropriately developed theoretical frameworks, we the design colloids with charged surface regions and study their assembly and equilibrium properties.

In my talk, I will (a) introduce the analytical/numerical description I developed to derive  the effective inter-particle potential (panels I and II of the figure below), (b) describe the associated coarse-grained model that can be easily implemented in Molecular Dynamics simulations codes (panel III of the figure), (c) show the experimental particles that are currently synthesized by my collaborators, and (d) describe an interesting case study to elucidate the great potentialities of this class of colloids (panel IV of the figure).

 

 

 

 Figure: A given charge 
 surface pattern (panel I) is
 represented by an ensemble
 of discrete charges inside the
 colloid (panel II), the
 underlying symmetries of the
 charge distribution are then
 used to design a patchy
 model with charged regions of
 finite extent (panel III).


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