Inverkan av olika joner och jonconcentrationer på porstorleksfördelningen i trämassa-fibrer
Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
The influence of different ions and ionconcentrations on pore size distribution in woodfibers (English)
The basic ingredient of paper is the individual wood fibers. The property of the fibers depends on a variety of factors e.g., method of pulp production and processing. The final sheet quality depends in part on how the fibers interface between each other and therefore factors that affect the fiber size are of interest.
The flexibility of the fibers depends in part on the pore water i.e., the fiber swelling. The sheet becomes less flexible at low water content which gives a loss in strength. Thus it becomes desirable to increase the water uptake.
The experimental investigation described in this report consists of exposing the wood fibers to different ions and ionic strength and then measure the pore size by thermoporosimetry where a DSC (Differential Scanning Calorimeter) is used. DSC measures the freezing point of water in the pores of the wood fibers. As the freezing point varies with the pore size the size distribution can be determined.
The results show that there are complications with thermoporosimetry measurements at different ion concentrations. The strength of the ionic solutions will contribute to a fictitious pore volume, which makes analysis difficult to interpret.
Place, publisher, year, edition, pages
2011. , 32 p.
Thermoporosimetry, wood fibers, pore size distribution, water in fibers, decreasing freezing point
Termoporosimetri, trämassafibrer, porstorleksfördelning, vatten i fibrer, smältpunktnedsättning
Chemical Process Engineering Other Chemical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-33816OAI: oai:DiVA.org:kth-33816DiVA: diva2:417955
Subject / course
Bachelor of Science in Engineering - Chemical Engineering
UppsokPhysics, Chemistry, Mathematics
Silfwerbrand-Lindh, CatharinaSalmén, Lennart