This paper introduces methods to produce model surfaces for the main pulp fibre components, cellulose, lignin and extractives. Model film for cellulose was prepared using Langmuir-Blodgett (LB) technique. Lignin and extractive model films were produced using spincoating. The primary aim for the use of these surfaces is adsorption studies performed with the quartz crystal microbalance with dissipation (QCM-D) instrument. Thus, all the model films were deposited on the hydrophobic, polystyrene coated QCM-D crystals. Based on the atomic force microscopy (AFM) and X-Ray photoelectron spectroscopy (XPS) analyses, smooth, thin and rigid model films were achieved and they were found to be evenly distributed on the polystyrene surface. The stability of the films in aqueous solutions at different ionic strengths (cellulose and lignin films) and pH (extractive film) were studied using QCM-D. Some swelling/deswelling but no layer softening was detected with cellulose film. Some water penetrated into the lignin film but no swelling was detected. Extractive film was stable in acidic and neutral conditions but saponification of the fatty and resin acids at basic conditions resulted an unstable film. Model films were shown to give reproducible results when studying the carbohydrate adsorption with QCM-D. It was found that the adsorbed mass, physical properties of the formed adsorbed layer and the layer formation within the time scale used were all reproducible.
|Journal||Appita Annual Conference Proceedings|
|Publication status||Published - 2005|
|MoE publication type||A4 Article in a conference publication|
|Event||59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry) - Auckland, New Zealand|
Duration: 16 May 2005 → 19 May 2005
Conference number: 59