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Forces between polyelectrolyte-coated surfaces: relations between surface interaction and floc properties
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1994 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 93, p. 293-303Article in journal (Refereed)
Abstract [en]

The forces acting between negatively charged mica surfaces in the presence of some different cationic polyelectrolytes have been measured using a surface force apparatus. The different polyelectrolytes used have between 10% and 100% of the monomers charged. Particular emphasis has been given to the forces acting between the polyelectrolyte-coated surfaces when the ionic strength of the solution is low, i.e. when electrostatic forces predominate the interaction between the surface and the polyelectrolyte. Under these conditions the most highly charged polyelectrolytes adsorb in a very flat conformation and only a weak recharging is observed even at polyelectrolyte concentrations considerably above that needed to neutralise the mica surface charge. The surface force data are discussed in relation to the floc structures and properties obtained when latex particles are flocculated by polyelectrolytes. These studies are carried out by using a device that is based on three photometric dispersion analysers. The floc structures formed in the presence of various polyelectrolytes can to a large extent be rationalised by considering the interactions measured in the surface force apparatus provided that the difference in charge density of the mica surface and the latex surface is kept in mind.

Place, publisher, year, edition, pages
1994. Vol. 93, p. 293-303
Keyword [en]
Bridging attraction, flocculation, floc properties, polyelectrolyte adsorption, surface forcesThe forces acting between negatively charged mica surfaces in the presence of some different cationic polyelectrolytes have been measured using a surface force apparatus. The different polyelectrolytes used have between 10% and 100% of the monomers charged. Particular emphasis has been given to the forces acting between the polyelectrolyte coated surfaces when the ionic strength of the solution is low, i.e. when electrostatic forces predominate the interaction between the surface and the polyelectrolyte. Under these conditions the most highly charged polyelectrolytes adsorb in a very flat conformation and only a weak recharging is observed even at polyelectrolyte concentrations considerably above that needed to neutralise the mica surface charge. The surface force data are discussed in relation to the floc structures and properties obtained when latex particles are flocculated by polyelectrolytes. These studies are carried out by using a device that is based on three photometric dispersion analysers. The floc structures formed in the presence of various polyelectrolytes can to a large extent be rationalised by considering the interactions measured in the surface force apparatus provided that the difference in charge density of the mica surface and the latex surface is kept in mind.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26472OAI: oai:DiVA.org:ri-26472DiVA, id: diva2:1053474
Note
A897Available from: 2016-12-08 Created: 2016-12-08 Last updated: 2017-11-29Bibliographically approved

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