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Surfactant-controlled shape change of organic droplets using polypyrrole

Journal Article


Abstract


  • Control of the shape and position of organic droplets has been investigated using polypyrrole doped with the surfactant dodecylbenzenesulfonate (PPy.DBS). Ex-situ contact angle measurements of electrochemically-reduced PPy.DBS revealed a dramatic increase in wettability compared to the oxidised polymer, attributable to dopant reorientation and cation incorporation during the reduction process. In-situ studies showed that droplets of dichloromethane resting upon PPy.DBS electrodes and immersed in an aqueous electrolyte changed shape dramatically upon electrochemical reduction of the polymer. A mechanism for the unusual and unexpected changes in drop shape is presented. Controlled release of the surfactant dopant into the electrolyte upon reduction of PPy.DBS and subsequent doping of the polymer upon oxidation were found to affect the droplet shape. © 2011 Elsevier B.V. All rights reserved.

Publication Date


  • 2011

Citation


  • Halldorsson, J. A., Wu, Y., Brown, H. R., Spinks, G. M. & Wallace, G. G. (2011). Surfactant-controlled shape change of organic droplets using polypyrrole. Thin Solid Films, 519 (19), 6486-6491.

Scopus Eid


  • 2-s2.0-79958204339

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/4081

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 6486

End Page


  • 6491

Volume


  • 519

Issue


  • 19

Abstract


  • Control of the shape and position of organic droplets has been investigated using polypyrrole doped with the surfactant dodecylbenzenesulfonate (PPy.DBS). Ex-situ contact angle measurements of electrochemically-reduced PPy.DBS revealed a dramatic increase in wettability compared to the oxidised polymer, attributable to dopant reorientation and cation incorporation during the reduction process. In-situ studies showed that droplets of dichloromethane resting upon PPy.DBS electrodes and immersed in an aqueous electrolyte changed shape dramatically upon electrochemical reduction of the polymer. A mechanism for the unusual and unexpected changes in drop shape is presented. Controlled release of the surfactant dopant into the electrolyte upon reduction of PPy.DBS and subsequent doping of the polymer upon oxidation were found to affect the droplet shape. © 2011 Elsevier B.V. All rights reserved.

Publication Date


  • 2011

Citation


  • Halldorsson, J. A., Wu, Y., Brown, H. R., Spinks, G. M. & Wallace, G. G. (2011). Surfactant-controlled shape change of organic droplets using polypyrrole. Thin Solid Films, 519 (19), 6486-6491.

Scopus Eid


  • 2-s2.0-79958204339

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/4081

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 6486

End Page


  • 6491

Volume


  • 519

Issue


  • 19