{"id":{"repo_id":"durham","oai_identifier":"oai:etheses.durham.ac.uk:220"},"canonical_url":"https://search.dev.ndltd.org/etd/durham/oai:etheses.durham.ac.uk:220","repository":{"repo_id":"durham","name":"Durham University","base_url":"http://etheses.dur.ac.uk/cgi/oai2"},"display":{"title":"Optical Deformation of Emulsion Droplets","abstract":"Optical tweezers are a useful and fascinating tool for the manipulation of a range of microscopic particles. I describe the set up of optical trapping apparatus, and investigate the use of a spatial light modulator for the creation of arrays of optical traps. Optical deformation of microemulsion droplets has previously been demonstrated for systems with ultra-low interfacial tension. A disadvantage of the systems used was the strong temperature-dependence of the interfacial tension. I have explored options for creating temperature-insensitive microemulsions, and have shown that a mixed surfactant system containing docusate sodium salt (AOT) and pentaethylene monododecyl ether (C12E5) is capable of stabilising a temperature-insensitive microemulsion with very low interfacial tension. With this system I was able to deform droplets across a wide temperature range using dual optical tweezers. I have investigated several methods of producing a monodisperse emulsion with droplet diameters in the region of 5 μm, including microfluidic technology and membrane emulsification. Although I was unable to produce a monodisperse emulsion within the scope of this project, the work has presented promising future opportunities. A design has been produced for a microfluidic device that will enable trapping and manipulation of emulsion droplets, and will facilitate changing the continuous phase composition.","abstract_html":"Optical tweezers are a useful and fascinating tool for the manipulation of a range of microscopic particles. I describe the set up of optical trapping apparatus, and investigate the use of a spatial light modulator for the creation of arrays of optical traps. Optical deformation of microemulsion droplets has previously been demonstrated for systems with ultra-low interfacial tension. A disadvantage of the systems used was the strong temperature-dependence of the interfacial tension. I have explored options for creating temperature-insensitive microemulsions, and have shown that a mixed surfactant system containing docusate sodium salt (AOT) and pentaethylene monododecyl ether (C12E5) is capable of stabilising a temperature-insensitive microemulsion with very low interfacial tension. With this system I was able to deform droplets across a wide temperature range using dual optical tweezers. I have investigated several methods of producing a monodisperse emulsion with droplet diameters in the region of 5 μm, including microfluidic technology and membrane emulsification. Although I was unable to produce a monodisperse emulsion within the scope of this project, the work has presented promising future opportunities. A design has been produced for a microfluidic device that will enable trapping and manipulation of emulsion droplets, and will facilitate changing the continuous phase composition.","abstract_has_math":false,"creators":["Bunyan, Hannah Marie"],"institution":"Durham University","degree_name":"Masters","degree_level":"masters","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2010,"date_issued":"2010","date_published":"2010","updated_at":"2026-07-24T02:11:04Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Bunyan, Hannah Marie"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2010"]},{"key":"dc:date.issued","label":"Date","values":["2010"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Chemistry, Department of"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["Durham University"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://etheses.durham.ac.uk/id/eprint/220/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["masters"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Masters"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://etheses.durham.ac.uk/id/eprint/220/1/Hannah_Bunyan_Thesis.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Optical tweezers are a useful and fascinating tool for the manipulation of a range of microscopic particles. I describe the set up of optical trapping apparatus, and investigate the use of a spatial light modulator for the creation of arrays of optical traps. Optical deformation of microemulsion droplets has previously been demonstrated for systems with ultra-low interfacial tension. A disadvantage of the systems used was the strong temperature-dependence of the interfacial tension. I have explored options for creating temperature-insensitive microemulsions, and have shown that a mixed surfactant system containing docusate sodium salt (AOT) and pentaethylene monododecyl ether (C12E5) is capable of stabilising a temperature-insensitive microemulsion with very low interfacial tension. With this system I was able to deform droplets across a wide temperature range using dual optical tweezers. I have investigated several methods of producing a monodisperse emulsion with droplet diameters in the region of 5 μm, including microfluidic technology and membrane emulsification. Although I was unable to produce a monodisperse emulsion within the scope of this project, the work has presented promising future opportunities. A design has been produced for a microfluidic device that will enable trapping and manipulation of emulsion droplets, and will facilitate changing the continuous phase composition."]},{"key":"dc:format","label":"Dc Format","values":["text"]},{"key":"dc:title","label":"Title","values":["Optical Deformation of Emulsion Droplets"]}]}],"canonical_facts":{"dc:creator":["Bunyan, Hannah Marie"],"dc:date":["2010"],"dc:date.issued":["2010"],"dc:description.abstract":["Optical tweezers are a useful and fascinating tool for the manipulation of a range of microscopic particles. I describe the set up of optical trapping apparatus, and investigate the use of a spatial light modulator for the creation of arrays of optical traps. Optical deformation of microemulsion droplets has previously been demonstrated for systems with ultra-low interfacial tension. A disadvantage of the systems used was the strong temperature-dependence of the interfacial tension. I have explored options for creating temperature-insensitive microemulsions, and have shown that a mixed surfactant system containing docusate sodium salt (AOT) and pentaethylene monododecyl ether (C12E5) is capable of stabilising a temperature-insensitive microemulsion with very low interfacial tension. With this system I was able to deform droplets across a wide temperature range using dual optical tweezers. I have investigated several methods of producing a monodisperse emulsion with droplet diameters in the region of 5 μm, including microfluidic technology and membrane emulsification. Although I was unable to produce a monodisperse emulsion within the scope of this project, the work has presented promising future opportunities. A design has been produced for a microfluidic device that will enable trapping and manipulation of emulsion droplets, and will facilitate changing the continuous phase composition."],"dc:format":["text"],"dc:identifier.uri":["https://etheses.durham.ac.uk/id/eprint/220/1/Hannah_Bunyan_Thesis.pdf"],"dc:publisher.department":["Chemistry, Department of"],"dc:publisher.institution":["Durham University"],"dc:relation.isreferencedby":["https://etheses.durham.ac.uk/id/eprint/220/"],"dc:title":["Optical Deformation of Emulsion Droplets"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["masters"],"dc:type.qualificationname":["Masters"]},"updated_at":"2026-07-24T02:11:04Z"}