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    Core-Shell Nanoparticle Interface and Wetting Properties

    Year: 2020

    Journal: Adv. Funct. Mater., Volume 30, APR

    Authors: Engstrom, Joakim; Brett, Calvin J.; Koerstgens, Volker; Mueller-Buschbaum, Peter; Ohm, Wiebke; Malmstrom, Eva; Roth, Stephan V.

    Organizations: DESY strategic fund (DSF) "Investigation of processes for spraying and spray-coating of hybrid cellulose-based nanostructures"

    Keywords: colloids; film formation; latex; spraying; wetting

    Latex colloids are among the most promising materials for broad thin film applications due to their facile surface functionalization. Yet, the effect of these colloids on chemical film and wetting properties cannot be easily evaluated. At the nanoscale, core-shell particles can deform and coalesce during thermal annealing, yielding fine-tuned physical properties. Two different core-shell systems (soft and rigid) with identical shells but with chemically different core polymers and core sizes are investigated. The core-shell nanoparticles (NPs) are probed during thermal annealing in order to investigate their behavior as a function of nanostructure size and rigidity. X-ray scattering allows to follow the re-arrangement of the NPs and the structural evolution in situ during annealing. Evaluation by real-space imaging techniques reveals a disappearance of the structural integrity and a loss of NP boundaries. The possibility to fine-tune the wettability by tuning the core-shell NPs morphology in thin films provides a facile template methodology for repellent surfaces.
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