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Stimuli-controlled manipulation of synthetic discrete micrometre sized “vehicles"

Francis, Wayne (2017) Stimuli-controlled manipulation of synthetic discrete micrometre sized “vehicles". PhD thesis, Dublin City University.

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Abstract

Research in the microfluidic sector has seen serious growth since the 1980s and much progress has been made towards the realisation of true lab on a chip (LOC) devices. However, despite the amount of work put into the design and applications of these chips, there has been a noticeable lack of innovation into the control of flow inside these microfluidic platforms. Conventionally flow is controlled via external pumps and solenoid valves which hinder the scalability of the system. Stimuli-controlled manipulation of discrete micro-sized “vehicles” offers a novel method for controlling flow inside fluidic platforms, while also offering many unique advantages. These include external manipulation of individual or multiple droplets simultaneously while also opening the possibility of using these droplets as micro-vessels for chemical reactions, cargo transport to desired destinations, dynamic sensing, leak detection and drug delivery. Two novel methods for stimuli-controlled movement of micro-sized droplets are presented in the following chapters of this thesis that include chemotaxis and electrotaxis. These single component droplets are self-propelling and are guided to specific destinations through chemically generated Cl- gradients. The droplets consist solely of the ionic liquid (IL) Trihexyl(tetradecyl)phosphonium chloride ([P6,6,6,14][Cl]). The movement of the droplets is controlled by the triggered release of the [P6,6,6,14]+, a very efficient cationic surfactant, which is a constituent of the IL droplet. Several applications are explored for these droplets. Additionally, polymeric hydrogel walkers containing photochromic spiropyran molecules are studied for their ability to achieve photo-controlled movement at the liquid-solid interface.

Item Type:Thesis (PhD)
Date of Award:November 2017
Refereed:No
Supervisor(s):Diamond, Dermot and Florea, Larisa and Morrin, Aoife
Uncontrolled Keywords:Microdroplet movement
Subjects:Physical Sciences > Photochemistry
Biological Sciences > Microfluidics
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)
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:21937
Deposited On:16 Nov 2017 11:17 by Dermot Diamond. Last Modified 16 Nov 2017 11:17

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