Journal
CELLULOSE
Volume 18, Issue 2, Pages 257-270Publisher
SPRINGER
DOI: 10.1007/s10570-010-9482-y
Keywords
Nanofibrillated cellulose; MFC; Adsorption; Cationic surfactants; Admicelles; Contact angles; Wetting
Funding
- Research Council of Norway
- Sodra Cell
- Akzo Nobel
- Jotun
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Adsorption isotherms of single and double chain cationic surfactants with different chain length (cetyltrimethyl-, didodecyl- and dihexadecyl ammonium bromide) onto cellulose nanofibrils were determined. Nanofibrillated cellulose, also known as microfibrillated cellulose (MFC), with varying contents of carboxyl groups (different surface charge) was prepared by TEMPO-mediated oxidation followed by mechanical fibrillation. The fibril charge was characterized by potentiometric and conductometric titration. Surfactant adsorption was verified by Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS). Wetting and adhesion of water onto fibril films was determined by contact angle measurements. Small aggregates (admicelles) of surfactant were shown to form on the nanofibril surfaces, well below critical micelle concentrations. The results demonstrate the possibility of using cationic surfactants to systematically control the degree of water wettability of cellulose nanofibrils.
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