Self-assembly of soft nanoparticles with tunable patchiness.
Details of the forces between nanoparticles determine the ways in which the nanoparticles can self-assemble into larger structures. The use of directed interactions has led to new concepts in self-assembly such as asymmetric dendrons, Janus particles, patchy colloids and colloidal molecules. Recent models that include attractive regions or 'patches' on the surface of the nanoparticles predict a wealth of intricate modes of assembly. Interactions between such particles are also important in a range of phenomena including protein aggregation and crystallization, re-entrant phase transitions, assembly of nanoemulsions and the organization of nanoparticles into nanowires. Here, we report the synthesis of 6-nm nanoparticles with dynamic hydrophobic patches and show that they can form reversible self-assembled structures in aqueous solution that become topologically more connected upon dilution. The organization is based on guest-host supramolecular chemistry with the nanoparticles composed of a hydrophobic dendrimer host molecule and water-soluble hydrophilic guest molecules. The work demonstrates that subtle changes in hierarchal composition and/or concentration can dramatically change mesoscopic ordering.
Hermans
Thomas M
TM
Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands.
Broeren
Maarten A C
MA
Gomopoulos
Nikos
N
van der Schoot
Paul
P
van Genderen
Marcel H P
MH
Sommerdijk
Nico A J M
NA
Fytas
George
G
Meijer
E W
EW