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Photochromic spiropyran monolithic polymers: Molecular photo-controllable electroosmotic pumps for micro-fluidic devices


Walsh, Z and Scarmagnani, S and Benito-Lopez, F and Abele, S and Nie, F-Q and Slater, C and Byrne, R and Paull, B and Diamond, D and Macka, M, Photochromic spiropyran monolithic polymers: Molecular photo-controllable electroosmotic pumps for micro-fluidic devices, Sensors and Actuators - B: Chemical: International Journal Devoted to Research and Development of Physical and Chemical Transducers, 148, (2) pp. 569-576. ISSN 0925-4005 (2010) [Refereed Article]

DOI: doi:10.1016/j.snb.2010.04.048


A novel photo-controllable micro-fluidic electroosmotic pump based on spiropyran monolithic polymers is presented here for the first time. Photochromic monolithic scaffolds have been synthesised within poly(tetrafluoroethylene) coated fused silica capillaries. These monoliths have a photochromic spiropyran monomer incorporated in the bulk by thermally induced copolymerisation with a cross-linking agent (divinylbenzene) and were encased in micro-fluidic devices to function as photo-controllable electroosmotic pumps (EOPs). Due to the presence of the spiropyran the monolith can exist in two forms: a zwitterionic merocyanine (MC) form and an uncharged spiropyran (SP). As both forms bare a net overall zero charge, an acidic electrolyte was used to produce a stable anodic electroosmotic flow (EOF), while still retaining the ability to switch between the SP and the MC forms, which exhibit different charge distributions. It was confirmed that visible light, which produces the SP form, caused an increase in EOF while UV light, which generates the MC form, caused a decrease in EOF. In this way the EOF from the chip was modified by light and not by changing the electric field, temperature or buffer pH, some of the more common methods of altering the EOF.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Separation science
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Paull, B (Professor Brett Paull)
UTAS Author:Macka, M (Professor Mirek Macka)
ID Code:71638
Year Published:2010
Web of Science® Times Cited:12
Deposited By:Research Division
Deposited On:2011-07-26
Last Modified:2014-11-20

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