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Surfactant-controlled shape change of organic droplets using polypyrrole

journal contribution
posted on 2024-11-16, 06:20 authored by Gordon WallaceGordon Wallace, Hugh BrownHugh Brown, Yanzhe Wu, Geoffrey SpinksGeoffrey Spinks, Jennifer Halldorsson
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.

Funding

Nanobionics

Australian Research Council

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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.

Journal title

Thin Solid Films

Volume

519

Issue

19

Pagination

6486-6491

Language

English

RIS ID

41711

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