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Electronic Modulation of an Electrochemically induced Wettability Gradient to Control Water Movement on a Polyaniline Surface
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2773-5096
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-5154-0291
2006 (English)In: Thin Solid Films, ISSN 0040-6090, Vol. 515, no 4, 2003-2008 p.Article in journal (Refereed) Published
Abstract [en]

Wettability gradients can be electronically controlled in a multiple-electrode electrochemical structure that consists of a solid electrolyte and the conducting polymer polyaniline doped with dodecylbenzenesulfonic acid as the active surface. A bias applied directly between a counter electrode and the surface to be switched determines the initial water contact angle, while the potential between two electrodes on either side of the switch surface, connected to each other and the switch surface only through an electrolyte, induces a surface energy gradient. The spreading of water on the switchable surface can be modulated with both potentials. The wettability at each point of the switch surface is correlated to the local electrochromic state (visible color) of the material, offering a visual indication of how a water drop will spread before it is applied. This new device has potential applications in scientific areas such as micro-fluidics and biomaterials.

Place, publisher, year, edition, pages
2006. Vol. 515, no 4, 2003-2008 p.
Keyword [en]
Electrochemistry, Wetting, Surface energy, Organic conductor
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-14641DOI: 10.1016/j.tsf.2006.04.001OAI: oai:DiVA.org:liu-14641DiVA: diva2:24081
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-02-03
In thesis
1. On the Surface of Conducting Polymers: Electrochemical Switching of Color and Wettability in Conjugated Polymer Devices
Open this publication in new window or tab >>On the Surface of Conducting Polymers: Electrochemical Switching of Color and Wettability in Conjugated Polymer Devices
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Since the discovery in 1977 that conjugated polymers can be doped to achieve almost metallic electronic conduction, the research field of conducting polymers has escalated, with applications such as light emitting diodes, solar cells, thin film transistors, electrochemical transistors, logic circuits and sensors. The materials can be chemically modified during their synthesis in order to tailor the desired mechanical, electronic and optical properties of the final product. Polymers are also generally possible to process from solution, and regular roll-to-roll printing techniques can therefore be used for manufacturing of electronic components on flexible substrates like plastic or paper. On top of that, the nature of conjugated polymers enables the creation of devices with novel properties, which are not possible to achieve by using inorganic materials such as silicon.

The work presented in this thesis mainly focuses on devices that utilize two rather unique properties of conducting polymers. Conducting polymers are generally electrochromic, i.e. they change color upon electrochemical oxidation or reduction, and can therefore be used as both conductor and pixel element in simple organic displays. As a result of the electrochemical reaction, some polymers also alter their surface properties and have proven to be suitable materials for organic electronic wettability switches. Control of surface wettability has applications in such diverse areas as printing techniques, micro-fluidics and biomaterials.

The aim of the thesis is to briefly describe the physical and chemical background of the materials used in organic electronic devices. Topics include molecular properties and doping of conjugated polymers, electrochromism, surface tension etc. This slightly theoretical part is followed by a more detailed explanation of device design, functionality and characterization. Finally, a glance into future projects will also be presented.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap, 2005. 53 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1195
Keyword
Conjugated polymer, electrochemistry, surface energy, electrochromism, contact angle
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:liu:diva-4268 (URN)91-85457-28-0 (ISBN)
Presentation
2005-09-30, K3, Kåkenhus, Campus Norrköping, Linköpings universitetet, Norrköping, 10:00 (English)
Opponent
Supervisors
Note
ISRN/Report code: LiU-TEK-LIC-2005:50Available from: 2005-10-07 Created: 2005-10-07 Last updated: 2017-02-03Bibliographically approved
2. Organic Bioelectronics: Electrochemical Devices using Conjugated Polymers
Open this publication in new window or tab >>Organic Bioelectronics: Electrochemical Devices using Conjugated Polymers
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Since the Nobel Prize awarded discovery that some polymers or “plastics” can be made electronically conducting, the scientific field of organic electronics has arisen. The use of conducting polymers in electronic devices is appealing, because the materials can be processed from a liquid phase, much like ordinary non-conducting plastics. This gives the opportunity to utilize printing technologies and manufacture electronics roll-to-roll on flexible substrates, ultimately at very low costs. Even more intriguing are the possibilities to achieve completely novel functionalities in combination with the inherent compatibility of these materials with biological species. Therefore, organic electronics can be merged with biology and medicine to create organic bioelectronics, i.e. organic electronic devices that interact with biological samples directly or are used for biological applications.

This thesis aims at giving a background to the field of organic bioelectronics and focuses on how electrochemical devices may be utilized. An organic electronic wettability switch that can be used for lab-on-a-chip applications and control of cell growth as well as an electrochemical ion pump for cell communication and drug delivery are introduced. Furthermore, the underlying electrochemical structures that are the basis for the above mentioned devices, electrochemical display pixels etc. are discussed in detail. In summary, the work contributes to the understanding of electrochemical polymer electronics and, by presenting new bioelectronic inventions, builds a foundation for future projects and discoveries.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap, 2007
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1128
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-9679 (URN)978-91-85831-03-6 (ISBN)
Public defence
2007-10-26, K3, Kåkenhus, Campus Norrköping, Norrköping, 10:00 (English)
Opponent
Supervisors
Available from: 2007-10-03 Created: 2007-10-03 Last updated: 2017-02-03

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Isaksson, JoakimRobinson, NathanielBerggren, Magnus

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