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Electrotactic ionic liquid droplets

Francis, Wayne and Wagner, Klaudia and Beirne, Stephen and Officer, David and Wallace, Gordon and Florea, Larisa and Diamond, Dermot (2016) Electrotactic ionic liquid droplets. Sensors and Actuators B: Chemical, 239 . pp. 1069-1075. ISSN 0924-4247

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To our knowledge, this work describes the first example of electro-guided, self-propelled droplets composed solely of an ionic liquid (IL), namely trihexyl(tetradecyl)phosphonium chloride ([P6,6,6,14][Cl]). These self-propelled droplets travel along an aqueous-air boundary to desired destinations within the fluidic network. Electrotactic movement of the droplets is due to asymmetric electro-stimulated release of a constituent of the IL droplet, the [P6,6,6,14]+ ion, which is a very efficient cationic surfactant, through electrochemically generated Cl- gradients. The direction and speed of movement can be controlled by switching the impressed voltage (typically 5 - 9V) ON or OFF, and by changing the polarity of the electrodes in contact with the electrolyte solution. The Cl- gradients required for droplet movement are electrochemically generated using 3D printed electrodes which are embedded within the fluidic channels. On demand creation of these Cl- gradients electrochemically allows reversible droplet movement over expended periods of time, and provides a means for precise control over the droplet trajectory.

Item Type:Article (Published)
Subjects:Engineering > Materials
Physical Sciences > Electrochemistry
Physical Sciences > Organic chemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > INSIGHT Centre for Data Analytics
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Official URL:
Copyright Information:© 2016 Elsevier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland, Insight, centre for data analytics , European Union Marie Curie People Programme Mask: PIRSES-GA-2010-269302, Australian Research Council Centre of Excellence Scheme
ID Code:21347
Deposited On:08 Sep 2016 12:12 by Wayne Francis. Last Modified 22 May 2017 09:37

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