Deposition of Cellulose-Based Thin Films on Flexible Substrates

Materials

David Reishofer¹  Mathias Hobisch¹  Michael Weissl¹  Michael Süssenbacher¹  Stefan Spirk¹  Werner Schlemmer¹  Katrin Niegelhell¹  Harald Plank²  Armin Zankel²  Krisztina Zajki-Zechmeister² 

[1] Institute for Paper-, Pulp- and Fibre Technology, Graz University of Technology, Inffeldgasse 23, 8010 Graz, Austria;Institute of Electron Microscopy and Nanoanalysis (FELMI), Steyrergasse 17, 8010 Graz, Austria;

关键词: cellulose;    thin films;    trimethylsilyl cellulose;    superhydrophobic;    metal foils;   

DOI  :  10.3390/ma11122433

来源: DOAJ

【 摘 要 】

This study investigates flexible (polyamide 6.6 PA-6.6, polyethylene terephthalate PET, Cu, Al, and Ni foils) and, for comparison, stiff substrates (silicon wafers and glass) differing in, for example, in surface free energy and surface roughness and their ability to host cellulose-based thin films. Trimethylsilyl cellulose (TMSC), a hydrophobic acid-labile cellulose derivative, was deposited on these substrates and subjected to spin coating. For all the synthetic polymer and metal substrates, rather homogenous films were obtained, where the thickness and the roughness of the films correlated with the substrate roughness and its surface free energy. A particular case was the TMSC layer on the copper foil, which exhibited superhydrophobicity caused by the microstructuring of the copper substrate. After the investigation of TMSC film formation, the conversion to cellulose using acidic vapors of HCl was attempted. While for the polymer foils, as well as for glass and silicon, rather homogenous and smooth cellulose films were obtained, for the metal foils, there is a competing reaction between the formation of metal chlorides and the generation of cellulose. We observed particles corresponding to the metal chlorides, while we could not detect any cellulose thin films after HCl treatment of the metal foils as proven by cross-section imaging using scanning electron microscopy (SEM).

【 授权许可】

Unknown