Surface chemistry and rheology of polysulfobetaine-coated silica

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dc.contributor.authorStarck, Pen_AU
dc.contributor.authorMosse, WJKen_AU
dc.contributor.authorNicholas, NJen_AU
dc.contributor.authorSpiniello, Men_AU
dc.contributor.authorTyrrell, Jen_AU
dc.contributor.authorNelson, Aen_AU
dc.contributor.authorQiao, GGen_AU
dc.contributor.authorDucker, WAen_AU
dc.date.accessioned2008-04-18T06:47:25Zen_AU
dc.date.accessioned2010-04-30T05:03:10Zen_AU
dc.date.available2008-04-18T06:47:25Zen_AU
dc.date.available2010-04-30T05:03:10Zen_AU
dc.date.issued2007-07-03en_AU
dc.date.statistics2007-07en_AU
dc.description.abstractWe have measured the viscosity of suspensions of colloidal silica particles (d = 300 nm) and the properties of silica surfaces in solutions of a polymer consisting of zwitterionic monomer groups, poly(sulfobetaine methacrylate), polySBMA. This polymer has potential use in modifying surface properties because the polymer is net uncharged and therefore does not generate double- layer forces. The solubility of the polymer can be controlled and varies from poor to good by the addition of sodium chloride salt. Ellipsometry was used to demonstrate that polySBMA adsorbs to silica and exhibits an increase in surface excess at lower salt concentration, which is consistent with a smaller area per molecule at low salt concentration. Neutron reflectivity measurements show that the adsorbed polymer has a thickness of about 3.7 nm and is highly hydrated. The polymer can be used to exercise considerable control over suspension rheology. When silica particles are not completely covered in polymer, the suspension produces a highly viscous gel. Atomic force microscopy was used to show this is caused by bridging of polymer between the particles. At higher surface coverage, the polymer can produce either a high or very low viscosity slurry depending on the sodium chloride concentration. At high salt concentration, the suspension is stable, and the viscosity is lower. This is probably because the entrainment of many small ions renders the polymer film highly hydrophilic, producing repulsive surface forces and lubricating the flow of particles. At low salt concentrations, the polymer is barely soluble and more densely adsorbed. This produces less stable and more viscous solutions, which we attribute to attractive interactions between the adsorbed polymer layers. © 2007, American Chemical Societyen_AU
dc.identifier.citationStarck, P., Mosse, W. K. J., Nicholas, N. J., Spiniello, M., Tyrrell, J., Nelson, A., Qiao, G. G. & Druker, W. A. (2007). Surface chemistry and rheology of polysulfobetaine-coated silica. Langmuir, 23(14), 7587-7593. doi:10.1021/la700642den_AU
dc.identifier.govdoc1204en_AU
dc.identifier.issn0743-7463en_AU
dc.identifier.issue14en_AU
dc.identifier.journaltitleLangmuiren_AU
dc.identifier.pagination7587-7593en_AU
dc.identifier.urihttps://doi.org/10.1021/la700642den_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1083en_AU
dc.identifier.volume23en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectAqueous solutionsen_AU
dc.subjectAdsorptionen_AU
dc.subjectCharged currentsen_AU
dc.subjectWateren_AU
dc.subjectSilicaen_AU
dc.subjectPolymersen_AU
dc.titleSurface chemistry and rheology of polysulfobetaine-coated silicaen_AU
dc.typeJournal Articleen_AU
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