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Chemical force microscopy of cellulosic fibers |
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| Authors: | Juan C. Bastidas Richard Venditti Joel Pawlak Richard Gilbert Stefan Zauscher John F. Kadla |
| Affiliation: | aDepartment of Pulp and Paper Science Raleigh, North Carolina State University, NC, USA bDepartment of Mechanical Engineering and Materials Science, Duke University, Durham, NC, USA cBiomaterials Chemistry, Faculty of Forestry, University of British Columbia, 4034-2424 Main Mall, Vancouver, BC, Canada V6T 1Z4 |
| Abstract: | Atomic force microscopy with chemically modified cantilever tips (chemical force microscopy) was used to study the pull-off forces (adhesion forces) on cellulose model surfaces and bleached softwood kraft pulp fibers in aqueous media. It was found that for the –COOH terminated tips, the adhesion forces are dependent on pH, whereas for the –CH3 and –OH terminated tips adhesion is not strongly affected by pH. Comparison between the cellulose model surfaces and cellulosic fibers under our experimental conditions reveal that surface roughness does not affect adhesion strongly. X-ray photoelectron spectroscopy (XPS) and Fourier Transformed Infrared (FTIR) spectroscopy reveal that both substrate surfaces have homogeneous chemical composition. The results show that chemical force microscopy can be used for the chemical characterization of cellulose surfaces at a nano-level. |
| Keywords: | Atomic force microscopy (AFM) Chemical force microscopy (CFM) SAMS XPS Cellulose fibers Cellulose film Pull-off forces Adhesion forces |
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