Near-zero surface pressure assembly of rectangular lattices of microgels at fluid interfaces for colloidal lithography
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ROYAL SOC CHEMISTRY
Soft Matter, 2021, 17, 335 [doi: 10.1039/d0sm01823f]
SponsorshipSwiss National Science Foundation (SNSF) European Commission PP00P2-172913/1; Postdoctoral fellowships programme Beatriu de Pinos - Secretary of Universities and Research (Government of Catalonia); Horizon 2020 programme of research and innovation of the European Union under the Marie Skodowska-Curie grant 801370 2018 BP 00029; Spanish Juan de la Cierva Programme 2018 - Incorporation Grants IJC2018-035946-I
Understanding and engineering the self-assembly of soft colloidal particles (microgels) at liquid–liquid interfaces is broadening their use in colloidal lithography. Here, we present a new route to assemble rectangular lattices of microgels at near zero surface pressure relying on the balance between attractive quadrupolar capillary interactions and steric repulsion among the particles at water/oil interfaces. These self-assembled rectangular lattices are obtained for a broad range of particles and, after deposition, can be used as lithography masks to obtain regular arrays of vertically aligned nanowires via wet and dry etching processes.