1. Reeta Salminen and Eero Kontturi The Department of Forest Products Technology COST Action San Sebastian/Donostia 26 th -27 th May 2014 Cellulose nanocrystal submonolayers

2. exposure to different conditions new functional materials self-assembly patterns derivatisation Introduction and motivation Department of Forest Products Technology Reeta Salminen 25.05.2015 2 Submonolayers = surface not fully covered with deposited material Exposed surface CNC observation on a single crystal level

3. Experimental setting Silica wafer is cationized with (3-aminopropyl)trimethoxysilane (APTS) Cellulose nanocrystals (CNC) are spin coated on the APTS-surface Samples analyzed with atomic force microscopy (AFM) before and after exposure to an environment 25.05.2015 Department of Forest Products Technology Reeta Salminen 3

4. Example of results Department of Forest Products Technology Reeta Salminen 25.05.2015 4 and conlusions APTS adsobs CNC very efficiently Oven curing not necessary The formed submonolayers are resistant against HCl vapour, aqueous HCl and water

5. Thank you! Department of Forest Products Technology Reeta Salminen