Surfactant-controlled shape change of organic droplets using polypyrrole

Authors

Gordon G. Wallace, University of WollongongFollow
Hugh R. Brown, University of WollongongFollow
Yanzhe Wu, University of WollongongFollow
Geoffrey M. Spinks, University of WollongongFollow
Jennifer A. Halldorsson, University of WollongongFollow

RIS ID

41711

Publication Details

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.

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. C 2011 Elsevier B.V. All rights reserved.

Grant Number

ARC/FF0669110

Additional Grant Number

http://purl.org/au-research/grants/ARC/FF0669110