Contactless electrowetting
Electrowetting technology, known since more than 100 years, just recently was successfully applied for the fabrication of devices such as pixels, liquid lenses and µTas (micro total analysis systems). Some of those devices are already a market product and some others are expected to reach the maturi...
| Autor: | |
|---|---|
| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/95959 |
| Acceso en línea: | https://hdl.handle.net/2117/95959 https://dx.doi.org/10.5821/dissertation-2117-95959 |
| Access Level: | acceso abierto |
| Palabra clave: | Nanoestructures -- Propietats òptiques Àrees temàtiques de la UPC::Enginyeria electrònica |
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Contactless electrowetting |
| title |
Contactless electrowetting |
| spellingShingle |
Contactless electrowetting Virgilio, Vito di Nanoestructures -- Propietats òptiques Àrees temàtiques de la UPC::Enginyeria electrònica |
| title_short |
Contactless electrowetting |
| title_full |
Contactless electrowetting |
| title_fullStr |
Contactless electrowetting |
| title_full_unstemmed |
Contactless electrowetting |
| title_sort |
Contactless electrowetting |
| dc.creator.none.fl_str_mv |
Virgilio, Vito di |
| author |
Virgilio, Vito di |
| author_facet |
Virgilio, Vito di |
| author_role |
author |
| dc.contributor.none.fl_str_mv |
Castañer Muñoz, Esteban |
| dc.subject.none.fl_str_mv |
Nanoestructures -- Propietats òptiques Àrees temàtiques de la UPC::Enginyeria electrònica |
| topic |
Nanoestructures -- Propietats òptiques Àrees temàtiques de la UPC::Enginyeria electrònica |
| description |
Electrowetting technology, known since more than 100 years, just recently was successfully applied for the fabrication of devices such as pixels, liquid lenses and µTas (micro total analysis systems). Some of those devices are already a market product and some others are expected to reach the maturity to be marketed in the short period, although some fundamental aspects of the electrowetting phenomenon are not yet clear, like the origin of the saturation and the driving forces that lead to a contact angle variation. In the dissertation are presented several contributions to the electrowetting technology. First, have been reported the preliminary evidences about the contactless variation of the contact angle. Furthermore, these phenomena have been studied deeply and rigorous experimental work has been performed. Experimental data have been cross checked with simulations results and theoretical calculations. Finally, the results of the contactless electrowetting experiments lead us to be able to state that the driving element of the contact angle variation is the charge. Contactless electrowetting method has also unlocked the possibility to experimentally measure the impact of surrounding humidity in electrowetting dynamics and the limitations that introduce in the saturation of contact angle. The relationship between relative humidity and saturation contact angle resulted to be directly proportional and in line with the Peek¿s law prediction, here applied to a system in the micro scale. Therefore the last part of the dissertation was dedicated to the study of the charge driving of an electrowetting device in order to be able to control and predict the contact angle dynamics. As additional results it has been found that charge injection rate affects the speed of the contact angle variation, with negligible effects on the contact angle saturation. Cross checking the experimental results with theoretical predictions it has been found that the approximation of a droplet to a spherical cap gives a very good result while no clear contributions could be given to the saturation problem, leaving it open and without any clear solution, so far. Additionally, in this work contains a comprehensive review of state of the art of electrowetting technology and a detailed description of the multiphysic simulation method used. |
| publishDate |
2015 |
| dc.date.none.fl_str_mv |
2015 2015-11-27 2016 2016-11-09 |
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doctoral thesis http://purl.org/coar/resource_type/c_db06 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
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info:eu-repo/semantics/doctoralThesis |
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doctoralThesis |
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https://hdl.handle.net/2117/95959 https://dx.doi.org/10.5821/dissertation-2117-95959 |
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https://hdl.handle.net/2117/95959 https://dx.doi.org/10.5821/dissertation-2117-95959 |
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Inglés eng |
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Inglés |
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eng |
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open access http://purl.org/coar/access_right/c_abf2 |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 |
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openAccess |
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application/pdf |
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Universitat Politècnica de Catalunya |
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Universitat Politècnica de Catalunya |
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reponame:UPCommons. Portal del coneixement obert de la UPC instname:Universitat Politècnica de Catalunya (UPC) |
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UPCommons. Portal del coneixement obert de la UPC |
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1869418927601221632 |
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Contactless electrowettingVirgilio, Vito diNanoestructures -- Propietats òptiquesÀrees temàtiques de la UPC::Enginyeria electrònicaElectrowetting technology, known since more than 100 years, just recently was successfully applied for the fabrication of devices such as pixels, liquid lenses and µTas (micro total analysis systems). Some of those devices are already a market product and some others are expected to reach the maturity to be marketed in the short period, although some fundamental aspects of the electrowetting phenomenon are not yet clear, like the origin of the saturation and the driving forces that lead to a contact angle variation. In the dissertation are presented several contributions to the electrowetting technology. First, have been reported the preliminary evidences about the contactless variation of the contact angle. Furthermore, these phenomena have been studied deeply and rigorous experimental work has been performed. Experimental data have been cross checked with simulations results and theoretical calculations. Finally, the results of the contactless electrowetting experiments lead us to be able to state that the driving element of the contact angle variation is the charge. Contactless electrowetting method has also unlocked the possibility to experimentally measure the impact of surrounding humidity in electrowetting dynamics and the limitations that introduce in the saturation of contact angle. The relationship between relative humidity and saturation contact angle resulted to be directly proportional and in line with the Peek¿s law prediction, here applied to a system in the micro scale. Therefore the last part of the dissertation was dedicated to the study of the charge driving of an electrowetting device in order to be able to control and predict the contact angle dynamics. As additional results it has been found that charge injection rate affects the speed of the contact angle variation, with negligible effects on the contact angle saturation. Cross checking the experimental results with theoretical predictions it has been found that the approximation of a droplet to a spherical cap gives a very good result while no clear contributions could be given to the saturation problem, leaving it open and without any clear solution, so far. Additionally, in this work contains a comprehensive review of state of the art of electrowetting technology and a detailed description of the multiphysic simulation method used.La tecnología "Electrowetting", conocida desde hace más de 100 años, solo recientemente ha podido ser aplicada con éxito a dispositivos como pixeles, lentes líquidas y µTas (sístemas integrados de análisis). Algunos de estos productos ya se encuentran en el mercado, otros estan a punto de llegar a la madurez necesaria para ser comercializados, aún así, muchos aspectos fundamentales del fenomeno del "electrowetting" no están del todo claros, por ejemplo, el origen de la saturación del ángulo de contacto y las fuerzas que inducen la variación de este ángulo. En este trabajo de investigación se presentan varias contribuciones para entender mejor la technología "electrowetting". Primero, se han presentado evidencias preliminares de la variación "sin contacto" de ángulo de contacto. A continuación, estas observaciones han sido estudiadas profunda y rigurosamente con trabajo experimental. Finalmente, los resultados experimentales del electrowetting sin contacto han permitido entender que lo que induce la variación del ángulo de contacto es la carga. El "electrowetting" sin contacto permite la medida experimental del impacto de la húmedad de la atmosfera en las dinámicas del "electrowetting" y las limitaciones que ésta induce en el ángulo de contacto final. La relación entre la húmedad relativa del átmosfera y la saturación del ángulo de contacto es directa: contra más húmedad, más alto es el ángulo en saturación, en linea con las predicciones de la ley de Peek, en este caso, aplicado a microescala. La última parte del trabajo se ha dedicado a estudiar el control en carga de un dispositivo electrowetting para poder predecir y controlar las dinámicas de variación del ángulo de contacto. Como resultado adicional, se ha visto que el control de inyección de carga afecta la velocidad de variación del ángulo de contacto, con efectos segundarios despreciables en el ángulo final en saturación. Cruzando los resultados experimentales con las predicciones teóricas ha sido verificado que la aproximación de la gota a un casquete esférico da buenos resultados teóricos mientras no se ha podido dar ninguna contribución clara para la resolución del problema del ángulo de contacto, dejando abierto el tema. En este trabajo contiene además una revisión del estado del arte de la tecnología electrowetting y una descripción detallada del método de simulación multifísica usado.Universitat Politècnica de CatalunyaCastañer Muñoz, Esteban20152015-11-2720162016-11-09doctoral thesishttp://purl.org/coar/resource_type/c_db06VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/doctoralThesisapplication/pdfhttps://hdl.handle.net/2117/95959https://dx.doi.org/10.5821/dissertation-2117-95959reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/959592026-05-27T15:37:01Z |
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15,300724 |