@article{bastidas_pawlak_venditti_heitmann_hubbe_kadla_2008, title={A colloidal probe microscopy study of cellulose/gypsum interactions}, volume={59}, ISSN={["1044-5803"]}, DOI={10.1016/j.matchar.2006.12.007}, abstractNote={Drywall, which is made primarily of a calcium sulfate dihydrate (gypsum) core with paper on both sides, is one of the most widely used construction materials. Because board failure often occurs at the gypsum core/paper interface, it has become important to know the exact nature of the gypsum/cellulose bond and how crystal morphology affects it. This study provides data about the nature of this interaction by means of AFM and Colloidal Probe Microscopy. These methods made it possible to distinguish among the different crystal faces and their respective interactions with cellulose. Measured in air, the adhesive forces between the AFM tip and the different faces varied according to f(010) < f(120) < f(111) at 50% relative humidity. The differences in adhesive force with the different gypsum crystals face can be attributed to the differences in surface chemistry. The information obtained in this study will help guide improvements in the gypsum wallboard production process to obtain better bonding between the crystal and the paper.}, number={2}, journal={MATERIALS CHARACTERIZATION}, author={Bastidas, Juan C. and Pawlak, Joel J. and Venditti, Richard A. and Heitmann, John A. and Hubbe, Martin A. and Kadla, John F.}, year={2008}, month={Feb}, pages={144–150} }
 @article{bastidas_venditti_pawlak_gilbert_zauscher_kadla_2005, title={Chemical force microscopy of cellulosic fibers}, volume={62}, ISSN={0144-8617}, url={http://dx.doi.org/10.1016/j.carbpol.2005.08.058}, DOI={10.1016/j.carbpol.2005.08.058}, abstractNote={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.}, number={4}, journal={Carbohydrate Polymers}, publisher={Elsevier BV}, author={Bastidas, J and Venditti, R and Pawlak, J and Gilbert, R and Zauscher, S and Kadla, J}, year={2005}, month={Dec}, pages={369–378} }