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Electrotactic Ionic Liquid Droplets

Authors: 

Wayne Francis, Klaudia Wagner, Stephen Beirne, David Officer, Gordon Wallace, Larisa Florea, Dermot Diamond

Publication Type: 
Refereed Original Article
Abstract: 
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.
Digital Object Identifer (DOI): 
10.1016/j.snb.2016.08.098
Publication Status: 
Published
Date Accepted for Publication: 
Sunday, 14 August, 2016
Publication Date: 
28/02/2017
Journal: 
Sensors and Actuators B: Chemical
Research Group: 
Institution: 
Dublin City University (DCU)
Open access repository: 
Yes