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Esther Strub from EMPA is thanked for assistance in SEM characterization. Michael Sander, Antonius Armanious and Michael Zumstein from the University of Zürich are thanked for their assistance in QCM-D measurements and for fruitful discussions. Dr Jiang Wei from Alfa Laval and Dr Mohamed Eita from KAUST University are thanked for their advices. This work was supported by the European project NanoSelect, FP7 Collaborative project, grant agreement no. 280519.