Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 49: Wetting and Liquids at Interfaces and Surfaces I (joint session CPP/DY/O)

DY 49.5: Talk

Thursday, March 19, 2020, 10:30–10:45, ZEU 255

Core-shell latex colloids as interfaces for tailoring wetting properties — Calvin J. Brett^1,2,3, Joakim Engström^3,4, Volker Körstgens⁵, Peter Müller-Buschbaum^5,6, Eva Malmström⁴, and •Stephan V. Roth^1,4 — ¹DESY, 22603 Hamburg, Germany — ²KTH, Dept. Mechanics, SE-10044 Stockholm, Sweden — ³WWSC, SE-10044 Stockholm, Sweden — ⁴KTH, Dept. Fibre and Polymer Technology, SE-10044 Stockholm, Sweden — ⁵TUM, Physik Department, 85748 Garching, Germany — ⁶MLZ, TUM, 85748 Garching, Germany

Facile surface functionalisation of latex colloids makes them most promising materials for broad thin film applications. However, the effect of these colloids on chemical film and wetting properties is not easily evaluated. Core-shell particles can deform and coalesce on the nanoscale during thermal annealing yielding tailored physical properties. We investigated two different core-shell systems (soft and rigid) with identical shell but with chemically different core polymer and core size. These core-shell colloids are probed during thermal annealing on surfaces in order to investigate their behavior as a function of nanostructure size and rigidity. X-ray scattering allows us to follow the re-arrangement of the colloids 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 colloids' boundaries. We present the possibility to tailor and fine-tune the wettability by tuning the core-shell colloid morphology in thin films, thus providing a facile template methodology for repellent surfaces.