New approach to unravel the structureproperty relationship of methylcellulose- June 12, 2008 Abstract In the present paper we suggest a new concept to overcome some of the so far unsolved problems of the structureproperty relationship of methylcellulose, the most important nonionic cellulose ether industrially produced in large scale. Not only from the viewpoint of scientific understanding, but also from that of the peculiar and application-determining behavior, the aggregation in aqueous solution and phase separation on heating are the most important questions. As a part.http://www.springerlink.com/content/n214460781612167/ Indirect evidence of supramolecular changes within cellulose microfibrils of chemical pulp fibers upon drying- June 11, 2008 Abstract Dried and never-dried chemical pulps were subjected to strong sulfuric acid hydrolysis and the dimensions of the resulting cellulose nanocrystals (CNCs) were characterized by AFM image analysis. Although the average length of CNCs was fairly similar in all samples (5565 nm), the length distribution histograms revealed that a higher number of longer crystals and a lower number of shorter crystals were present in the CNC suspensions prepared from never-dried pulps. The...http://www.springerlink.com/content/p118175h15x55192/ Labeling the planar face of crystalline cellulose using quantum dots directed by type-I carbohydrate-binding modules- June 11, 2008 Abstract We report a new method for the direct labeling and visualization of crystalline cellulose using quantum dots (QDs) directed by carbohydrate-binding modules (CBMs). Two type-I (surface binding) CBMs belonging to families 2 and 3a were cloned and expressed with dual histidine tags at the N- and C-termini. Semiconductor (CdSe)ZnS QDs were used to label these CBMs following their binding to Valonia cellulose crystals. Using this approach, we demonstrated that QDs are linearly..http://www.springerlink.com/content/f1w6322708h6m568/ Dissolving of cellulose in PEGNaOH aqueous solution- June 5, 2008 Abstract Here, a new solvent system for cellulose is reported. The solvent is a mixed aqueous solution of 1.0 wt.% poly(ethylene glycol) (PEG) and 9.0 wt.% of NaOH. Cellulose powder was added into the mixture at room temperature at first, and freezing it at 15 C for 12 h following a thaw of the mixture at room temperature under strong stirring. There formed a clean solution of cellulose, and the optical microscopy was used to record the dissolving process....http://www.springerlink.com/content/0x47135731770wr1/ |