Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.570100
Title: Numerical simulations and experimental studies of microfluidic droplet formation
Author: Bashir, Shazia
ISNI:       0000 0004 2735 7245
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2012
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Abstract:
Within the microfluidic platform, the formation of droplets inside an immiscible carrier fluid is a key process which forms the basis of several potential applications. A series of investigations on microfluidic droplet formation is presented in this study using both numerical and experimental techniques. Numerical simulations based on the two phase level set method were performed to enable a detailed parametric study of the droplet formation process. A detailed experimental study of the effects of surfactants on an oil-water interface and on channel wettability during the droplet formation process were performed. Microchannels were patterned in polydimethylesiloxane (PDMS) via a SU-8 mould fabricated using soft lithography technique in order to prepare microfluidic devices for droplet generation. Modification of the inner microchannel surface from hydrophobic to hydrophilic was achieved using a novel plasma polymerization technique which enabled the generation of oil-in-water droplets. We present a novel channel blocking technique used in conjunction with a plasma polymerized coating to partially modify the surface wettability of pre-assembled microfluidic devices. Under controlled flow rate conditions, these spatially patterned devices are shown to be capable of generating water-in-oil-in-water double emulsions. Furthermore, we have used micron resolution particle image velocimetry (μPIV) to quantitatively describe the flow behaviour in both water-in-oil and oil-in-water emulsions.
Supervisor: Julia, Rees ; William, Zimmerman Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.570100  DOI: Not available
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