Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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
A model system for understanding the distribution of fines in a paper structure using fluorescence microscopy
Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.ORCID iD: 0000-0001-7235-0905
Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
Stora Enso, Karlstad Research Center.
Stora Enso, Karlstad Research Center.
2011 (English)Conference paper, Published paper (Refereed)
Abstract [en]

When making paper a sheet is formed by draining a specific amount of dilute water suspension of pulp and wet end additives through a wire-cloth. The procedure is well known but the underlying mechanisms are not fully understood. The pulp stock is composed by different particles such as fines, fibers, retention aids and other additives that interact with each other during the papermaking process. These interactions are important since they influence the properties of the formed paper. Pulp fibers have different sizes and the finest particle fraction is referred to as fines. In this study fines from bleached Kraft pulp were used.

The fines were oxidized to some extent as a consequence of the Kraft pulp process.A model system containing fibers and latex was used together with fluorescence microscopyand image analysis to study the Brownian motion of a probe in different electrolyte concentrations. The model system was built up of:

• A water suspension of 1 % fines, negatively charged. At this concentration the fines are interacting with each other, forming a gel like structure.

• Negatively charged probes with three different sizes (radii 50, 100 and 500 nm).

• Two types of electrolytes (NaCl and CaCl2). The electrolytes were used for altering the electrical double layer of the charged surfaces in the system.

By studying the Brownian motion of the probes with different sizes in the network of fines more can be understood about this model system. The knowledge obtained from this model system can be used for further understanding of the paper chemistry mechanisms.

References

Carlsson G., Warszynski P., van Stam J., J. Colloid Interface Sci., 2003, 267, 500-508

Carlsson G., van Stam J., Nord. Pulp Pap. Res. J., 2005, 20, 192-199

Carlsson G.,  Järnström L., van Stam J., J. Colloid Interface Sci., 2006, 298, 162-171

Rådberg W., Bachelor thesis, Karlstad University, 2010

Place, publisher, year, edition, pages
2011.
Keywords [en]
Fluorescence microscopy, diffusion coefficient, image analysis
National Category
Chemical Sciences
Research subject
Chemistry; Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-12327OAI: oai:DiVA.org:kau-12327DiVA, id: diva2:510530
Conference
The 25th European Colloid and Interface Society Conference. Berlin, Germany, September 4-9, 2011
Available from: 2012-03-16 Created: 2012-03-16 Last updated: 2015-12-28Bibliographically approved

Open Access in DiVA

No full text in DiVA

Authority records BETA

Carlsson, Gunilla

Search in DiVA

By author/editor
Carlsson, Gunilla
By organisation
Department of Chemistry and Biomedical Sciences
Chemical Sciences

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 84 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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