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A model system for understanding the distribution of fines in a paper structure using fluorescence microscopy
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
2015 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesisAlternative title
Ett modellsystem för att förstå fördelningen av fines i en pappersstruktur med hjälp av fluorescensmikroskopi (Swedish)
Abstract [en]

Fines have a very important role in paper chemistry and are a determinant in retention,

drainage and the properties of paper. The purpose of this project was to be able to label the

fines with fluorophores and study their Brownian motion with fluorescence microscopy.

When succeeded this could then be used to study fines, fibers and other additives in a

suspension thus giving the fundamental knowledge of why fines have this important role. Due

to aggregation of the fines no Brownian motion could be detected. Instead the fines were

handled as a network system and small fluorescence labeled latex particles were then studied

in this system. This approach yields information about the fines when the obstacle with

sedimentation of the network is resolved.

Abstract [sv]

Fines har en viktig roll i papperskemin och har en avgörande roll när det gäller retention,

dränering och papprets egenskaper. Syftet med detta projekt var att kunna färga in fines med

fluoroforer och sedan följa deras brownska rörelse med hjälp av ett fluorescensmikroskop.

Denna metod skulle sedan kunna användas för att observera interaktionerna mellan fines,

fibrer och andra additiver i en suspension. Det skulle göra de underliggande mekanismerna

kända för varför fines utgör en så viktig del i processen. På grund av att fines aggregerade så

fick man istället behandla dem som ett nätverk där man tillsatte redan fluorescerande prober

vars rörelser studerades. Att studera fines indirekt på detta vis kommer att ge information när

sedimenteringen av nätverket är löst.

Place, publisher, year, edition, pages
2015. , p. 27
Keyword [en]
fines, fluorescence microscopy, paper chemistry, Brownian motion, latex particles
Keyword [sv]
fines, fluorescensmikroskopi, papperskemi, brownsk rörelse, latexpartiklar
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kau:diva-36263OAI: oai:DiVA.org:kau-36263DiVA, id: diva2:818429
External cooperation
Stora Enso
Supervisors
Examiners
Available from: 2015-10-22 Created: 2015-06-08 Last updated: 2015-10-22Bibliographically approved

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