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Development of stimulus-responsive materials with improved performance characteristics for application as flow controllers in microfluidic platforms

Ziółkowski, Bartosz (2013) Development of stimulus-responsive materials with improved performance characteristics for application as flow controllers in microfluidic platforms. PhD thesis, Dublin City University.

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This thesis investigates the synthesis and performance of various stimuli-responsive materials with the aim of obtaining a suitable material for flow control in microfluidic platforms. Therefore, at first a literature review is carried out to choose a material for investigation as well as to determine the limitations of current materials so that potential areas where improvements can be made are defined. The materials chosen are mainly based on thermo-responsive polymer N-isopropylacrylamide. Hence, in the beginning the polymerisation of this polymer is investigated in various phosphonium-based ionic liquids to afford novel ionogels with tuneable viscoelastic properties that can serve as robust platforms for incorporation of stimulus- responsive entities. Later these ionogels are demonstrated as a novel and suitable platform for incorporating functionalised magnetic particles to obtain a magneto-responsive, soft ionogel. Photo-responsive gels are obtained by incorporation of spiropyran molecule into the polymer matrix. Improvements to the existing formulations are made by incorporation poly-acid in the polymer chains which allows the material to be actuated without additional chemicals. Moreover, the speed of actuation is improved by engineering a porous microstructure of the gels. Finally, as a future outlook, recently discovered, thermo-responsive poly-ionic liquids are investigated as potential substrates for novel stimulus responsive poly-ionic liquid gels. All these materials have been investigated from the perspective of incorporation into microfluidic devices as soft polymeric valves.

Item Type:Thesis (PhD)
Date of Award:November 2013
Supervisor(s):Diamond, Dermot
Uncontrolled Keywords:Materials Chemistry; Polymer Gels; Ionogels
Subjects:Physical Sciences > Photochemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
Funders:Science Foundation Ireland
ID Code:19233
Deposited On:26 Nov 2013 12:02 by Dermot Diamond. Last Modified 10 Oct 2016 15:58

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