Abstract
This research explores fundamental, structural differences of ultrathin films, prepared with three distinct deposition methods using 2,2,6,6-tetramethyl-piperidin-1-oxyl radical oxidized cellulose nanofibres (TEMPO-CNFs) derived from never dried bleached birch pulp. There is standard characterization by atomic force microscopy (morphology, roughness) and ellipsometry (thickness) and important structural data is gained by exposing the films to water vapor and monitoring the vapor uptake with quartz crystal microbalance (QCM). Significant distinctions were found from QCM data that could be linked to the structure of the films, originating from the three deposition methods: adsorption, spin coating and electrophoretic deposition. Moreover, the results shown here have potential implications for various types of films that comprise of amphiphilic nanomaterials that have a distinct response to moisture or aqueous based solutions.
| Original language | English |
|---|---|
| Pages (from-to) | 1715-1724 |
| Journal | Cellulose |
| Volume | 25 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 18 Jan 2018 |
| MoE publication type | A1 Journal article-refereed |
Funding
The authors acknowledge the Academy of Finland (Project Nos. 297962 (K.Y. and M.L.), 259500 (E.K.) 263577 (M.P.) and 300367 (T.T.)) Aalto University School of Chemical Technology—VTT “Forest Meets Chemistry Programme” and the Technology Industries of Finland Centennial/Jane and Aatos Erkko Foundations “Future Makers: Biorefinery Side Stream Materials for Advanced Biopolymer Materials (BioPolyMet)” project (BW, ML) for funding this work.
Keywords
- Electrophoretic deposition
- Humidity response
- TEMPO-oxidised nanofibrillated cellulose
- Ultrathin films
- Water uptake