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Self‐Assembly Behavior of Oppositely Charged Inverse Bipatchy Microcolloids

: Naderi Mehr, F.; Grigoriev, D.; Heaton, R.; Baptiste, J.; Stace, A.J.; Puretskiy, N.; Besley, E.; Böker, A.

Volltext ()

Small 16 (2020), Nr.14, Art. 2000442, 9 S.
ISSN: 1613-6810
ISSN: 1613-6829
European Commission EC
H2020; 648365; REPLICOLL
Self-replicating Colloidal Assemblies
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IAP ()

A directed attractive interaction between predefined “patchy” sites on the surfaces of anisotropic microcolloids can provide them with the ability to self‐assemble in a controlled manner to build target structures of increased complexity. An important step toward the controlled formation of a desired superstructure is to identify reversible electrostatic interactions between patches which allow them to align with one another. The formation of bipatchy particles with two oppositely charged patches fabricated using sandwich microcontact printing is reported. These particles spontaneously self‐aggregate in solution, where a diversity of short and long chains of bipatchy particles with different shapes, such as branched, bent, and linear, are formed. Calculations show that chain formation is driven by a combination of attractive electrostatic interactions between oppositely charged patches and the charge‐induced polarization of interacting particles.