Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Determination of Distribution of Fines in a Paper Structure using Fluorescence Microscopy- an introduction
Karlstad University, Division for Chemistry.
2010 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

When making paper, fibers and additives are suspended in water to a fiber suspension. The sheet is formed by draining a specific amount of suspension through a wire-cloth. The procedure is well known, but the underlying mechanisms are not fully understood. To understand how the different particles such as fines, fibers, retention aids and other additives interact with each other, further research is needed. This knowledge is important because in the production of paper, the retention and the distribution of fines and additives within a paper structure are vital parameters for the properties and also for the profitability of the final product. In this study fluorescence microscopy was used to study fines from bleached kraft pulp which were labeled with fluorophores. When the fines exhibit fluorescence we can study their individual trajectories and understand more about the interactions between fibers, fines and additives in different chemical environments. Fines from bleached kraft pulp have no fluorescent properties and therefore it is necessary to bind a fluorophore to the material. It was difficult to find a suitable fluorophore which binds covalently to the cellulose, the dominating part of fines. The result from this study was that the labeled fines did exhibited fluorescence. As the fines were aggregated no individual trajectories could be analyzed with fluorescence microscopy. Further development of the technique for labeling fines must be carried out to avoid aggregation of fines.

Abstract [sv]

Vid tillverkning av papper, blandas fibrer och tillsatser i vatten till en fibersuspension. Arket bildas genom att avvattna suspensionen genom en vira. Förfarandet är välkänt men för att förstå mekanismerna måste vi förstå hur olika partiklar som fines, fibrer, retentionsmedel och andra tillsatser interagerar med varandra. Denna kunskap är viktigt eftersom i produktionen av papper är retention och distribution av fines och tillsatser i en pappersstruktur avgörande parametrar för de egenskaper, och även för lönsamheten, som erhålls i den slutliga produkten. I denna studie används fluorescensmikroskopi för att kunna studera fines av blekt sulfatmassa som blivit märkta med fluoroforer. När materialet uppvisar fluorescens kan deras individuella rörelsemönster studeras och därmed kan interaktionen som sker mellan fibrer, fines och tillsatser i olika kemiska miljöer förstås. Fines av blekt sulfatmassa har inga fluorescerande egenskaper och därför är det nödvändigt att binda en fluorfor till materialet. Det var svårt att hitta en lämplig fluorofor som binder kovalent till cellulosa, den dominerande delen av fines. Resultatet från denna studie visar att lösningarna med fluorescentmärkta fines uppvisade fluorescens. Eftersom det skedde en aggregering av fines kunde inte deras individuella rörelsemönster analyseras med fluorescensmikroskopi. Modifiering av märkningen måste göras för att kunna undvika aggregeringen av fines.

Place, publisher, year, edition, pages
2010. , p. 24
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kau:diva-6469OAI: oai:DiVA.org:kau-6469DiVA, id: diva2:356541
Uppsok
Physics, Chemistry, Mathematics
Supervisors
Available from: 2010-10-19 Created: 2010-10-13 Last updated: 2010-10-19Bibliographically approved

Open Access in DiVA

fulltext(656 kB)822 downloads
File information
File name FULLTEXT01.pdfFile size 656 kBChecksum SHA-512
7c46103d3131fe55eab003f363e6ec99f23b3e306024ce404c43c6163e4ea838d8877244f1de18f985d8fa86d97b436df6acd24ab005a2d6679fa593f294912e
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Rådberg, Weronica
By organisation
Division for Chemistry
Physical Chemistry

Search outside of DiVA

GoogleGoogle Scholar
Total: 822 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 316 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf