Publications by authors named "U Hirn"
Article Synopsis
- Plant cell walls are really complicated, which makes it hard to understand how they are made and used in industries, especially with cellulose materials.
- Advanced computer simulations, called molecular dynamics, can help scientists learn more about the properties of plant fibers and how they work at a tiny level.
- This review shares important findings and ideas from these simulations, which can help researchers study plant cell walls better and find new ways to use them.
Adhesion between solid materials is caused by intermolecular forces that only take place if the adhering surfaces are at nanoscale contact (NSC) (i.e., 0.
View Article and Find Full Text PDFThe research conducted on kraft cooking of for different chip sizes is often not representative for the industrial process since the chip size fractions were made of high-quality wood without impurities. We evaluated the effects and the potential of cooking non ideal spruce chip fractions after industrial chipping and screening. The chips were classified according to SCAN 40:01, and the respective fractions were cooked under the identical conditions to mimic the effect of a joint cooking in the industrial digester.
View Article and Find Full Text PDFLiquid penetration in porous cellulosic materials is crucial in many technological fields. The complex geometry, small pore size, and often fast timescale of liquid uptake makes the process hard to capture. Effects such as swelling, vapor transport, film flow and water transport within cellulosic material makes transport deviate from well-known relations such as Lucas-Washburn and Darcy's Law.
View Article and Find Full Text PDFArticle Synopsis
- Xylan contributes to the strength and integrity of plant cell walls, and its role during the pulping process significantly affects its functionality in papermaking.
- Enzymatic degradation of xylan leads to a weaker paper structure, whereas adding extra xylan enhances the paper's mechanical properties by improving fiber connections.
- The study emphasizes that maintaining intrinsic xylan during pulping is essential for achieving optimal paper strength, as extrinsic xylan alone cannot replicate these properties.