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dc.contributor.advisorSefiane, Khellil
dc.contributor.authorRadulovic, Jovana
dc.date.accessioned2011-01-31T13:29:00Z
dc.date.available2011-01-31T13:29:00Z
dc.date.issued2010
dc.identifier.urihttp://hdl.handle.net/1842/4710
dc.description.abstractSurface active agents have been successfully employed in numerous industrial, agricultural and biomedical applications for decades. Trisiloxane surfactants in particular have proved to be exceptionally effective as wetting enhancers; hence the name ‘superspreaders’. Since the early ‘90s these extraordinary surfactants have become an irreplaceable component in various products and processes. However, the true nature of their specific wetting behaviour has not been fully revealed and their underlying wetting mechanisms are still poorly understood despite substantial scientific interest during the last decades. In this thesis is an attempt to shed light on specific wetting and spreading behaviour of trisiloxane solutions. Commercial superspreader products were tested in various environments in order to get further insight into their performance in specific practical applications. Experimental investigation of wetting of superspreader solutions on surfaces of different hydrophobicity and comparison to that of a conventional surfactant revealed superiority of trisiloxanes. Exceptional interfacial activity was explained in terms of the specific chemical structure and ‘T’-shape of the molecule. However, sensitivity of the trisiloxane head to low pH and long-time ageing in aqueous environment was revealed. Performance of binary mixtures of commercial superspreaders and conventional surfactant was also assessed. Behaviour of trisiloxanes in the capillary action was studied. Finally, a comprehensive mathematical model for trisiloxane wetting, which incorporates diffusion as the governing factor of the wetting process, was developed.en
dc.contributor.sponsorBirse Foundationen
dc.language.isoenen
dc.publisherThe University of Edinburghen
dc.relation.hasversionOn the effect of pH on spreading of surfactant solutions on hydrophobic surfaces Radulovic, J., Sefiane, K., and Shanahan, M. E. R. Journal of Colloid and Interface Science, Volume 332, Issue 2, 15 April 2009, Pages 497-504en
dc.relation.hasversionInvestigation of spreading of surfactant mixtures Radulovic, J., Sefiane, K., and Shanahan, M. E. R. Chemical Engineering Science, Volume 64, Issue 14, 15 July 2009, Pages 3227-3235en
dc.relation.hasversionSpreading and Wetting Behaviour of Trisiloxanes Radulovic, J., Sefiane, K., and Shanahan, M. E. R. Journal of Bionic Engineering, Volume 6, Issue 4, December 2009, Pages 341-349en
dc.relation.hasversionSpreading Exponents: Dynamics of Trisiloxane Wetting of Hydrophobic Surfaces Radulovic, J., Sefiane, K., and Shanahan, M. E. R. Defect and Diffusion Forum, 303-304 (2010) 139en
dc.relation.hasversionAgeing of trisiloxane solutions Radulovic, J., Sefiane, K., and Shanahan, M. E. R. Chemical Engineering Science, Volume 65, Issue 18, 15 September 2010, Pages 5251-5255en
dc.relation.hasversionDynamics of Trisiloxane Wetting: the Effect of Diffusion and Surface Hydrophobicity Radulovic, J., Sefiane, K., and Shanahan, M. E. R. J. Phys. Chem. C, 2010, 114 (32), pp 13620–13629en
dc.subjecthydrophobicityen
dc.subjectsuperspreading surfactantsen
dc.subjectwettingen
dc.titleExperimental and theoretical investigation of the interfacial phenomenon associated with wetting of trisiloxane surfactant solutionsen
dc.typeThesis or Dissertationen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD Doctor of Philosophyen


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