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Colloidal particles derived from a complex of phosphotungstic acid and ethoxylated surfactants

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dc.contributor.author Sweeney, M. en_US
dc.contributor.author Smith, Thomas en_US
dc.contributor.author Croucher, M. en_US
dc.contributor.author Langner, Andreas en_US
dc.contributor.author Miri, Massoud en_US
dc.contributor.author Klymachyov, A. en_US
dc.contributor.author Kaplan, S. en_US
dc.contributor.author Tshudy, D. en_US
dc.date.accessioned 2006-07-19T19:41:12Z en_US
dc.date.available 2006-07-19T19:41:12Z en_US
dc.date.issued 2002-09 en_US
dc.identifier.citation Journal of Colloid and Interface Science 253N1 (2002) 53-61 en_US
dc.identifier.issn 0021-9797 en_US
dc.identifier.uri http://hdl.handle.net/1850/2173 en_US
dc.description.abstract Stable, colloidal sols of submicron size were prepared by titration of aqueous solutions of alkylene oxide surfactants with phosphotungstic acid, H3PW12O40 (PTA), followed by neutralization with ammonium or potassium hydroxide. The stoichiometry of the complex between phosphotungstic acid and the ethoxylated surfactant was determined by 1H and 31P NMR and was dependent upon the degree of ethoxylation. For example, in the ethoxylated octylphenol having 9–10 ethylene oxide units, Triton X-100, the mole ratio of surfactant to PTA was 4.5. In the ethoxylated octylphenol having 70 ethylene oxide units, Triton X-705, the mole ratio of surfactant to PTA was 1. Prior to nucleation of particles, phosphotungstic acid forms an apparent yellow charge transfer complex with ethoxylated alkylphenol surfactants, typified by Triton X-405. This complex is characterized by an absorption spectrum that is the sum of the spectra of Triton X-405 and PTA with a very weak shoulder at 400–500 nm. Particles were nearly monodisperse and their size was dependent on the nonionic surfactant employed, the heteropolyacid, and the rate of addition of heteropolyacid solution. en_US
dc.format.extent 37365 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Elsevier: Journal of Colloid and Interface Science en_US
dc.subject Colloidal particles en_US
dc.subject Ethoxylation en_US
dc.subject Surfactants en_US
dc.subject Lanthanum compounds en_US
dc.subject Temperature dependence en_US
dc.subject Thermodynamic properties en_US
dc.title Colloidal particles derived from a complex of phosphotungstic acid and ethoxylated surfactants en_US
dc.type Abstract en_US
dc.identifier.url http://dx.doi.org/10.1006/jcis.2002.8499

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