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Latex particle behavior studied in the wet state with fluorescence microscopy
Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences. Karlstad University, Faculty of Technology and Science, Materials Science.
Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences. Karlstad University, Faculty of Technology and Science, Materials Science.ORCID iD: 0000-0001-7235-0905
Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences. Karlstad University, Faculty of Technology and Science, Materials Science.ORCID iD: 0000-0002-0995-3823
2010 (English)Conference paper, (Refereed)
Abstract

Dispersions of latex are often used as model systems due to the well known properties of the latex particles. They can be made with a monodisperse distribution, different extent of cross linking and different surface charges. The behavior of latex particles in the wet state is important for both film formation and understanding what happens in the system when different additives are introduced. Latex is used in many different blends and one common additive is surfactants, both for stabilization during manufacturing and for adjusting the system features in different applications. A suitable method for studying latex dispersions in wet state is fluorescence microscopy. By adding latex particles with similar size and charge, marked with a fluorophore, particle movements can be followed even if the particle radius is below microscope resolution limit. This can be used for studying particle behavior in dispersions with different additives, in order to see how the additives affect the latex particles.



By measuring the latex particles displacement, diffusion coefficients can be determined. This has been successfully used for both high and low latex volume fractions [1-3]. Since surfactants are a common additive, the focus in our studies lies on interactions between surfactants and negatively charged latex. When DoTAB (dodecyl trimethyl ammonium bromide), a cationic surfactant, is added to the latex dispersion, an interesting behavior can be seen. Both diffusion coefficients and conductivity measurements show that at a certain concentration, when DoTAB has neutralized the latex particles, aggregates are formed. When the DoTAB concentration is raised even more, the aggregates dissolve. Light scattering measurements give the same indications.



Combined with other studies, such as film formation, the particle behavior gives important information about what happens in the system when different concentration of both latex and additives are used.



[1] Carlsson G., Warszynski P. and van Stam J., J. Colloid Interface Sci., 2003, 267, 500-508 [2] Carlsson G., Järnström L. and van Stam J., J. Colloid Interface Sci., 2006, 298, 162-171

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

Place, publisher, year, edition, pages
2010.
Keyword [en]
fluorescence microscopy, diffusion, latex
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:kau:diva-10516OAI: oai:DiVA.org:kau-10516DiVA: diva2:494056
Conference
Molecular Processes at Solid Surfaces 10th Annual Surface and Colloid Symposium, 24-26 November 2010, Lund
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2014-09-10Bibliographically approved

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Heidkamp, HannahCarlsson, Gunillavan Stam, Jan
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