This title appears in the Scientific Report :
2001
Please use the identifier:
http://hdl.handle.net/2128/19988 in citations.
Entwicklung und Charakterisierung von Mikroemulsionen mit aromatischen Heterozyklen für die Elektropolymerisation
Entwicklung und Charakterisierung von Mikroemulsionen mit aromatischen Heterozyklen für die Elektropolymerisation
For the electropolymerizable aromatic heterocycles thiophene, 3-methoxythiophene and 3,4- ethylenedioxythiophene (EDT) microemulsions were developed . These microemulsions allow to dissolve the aforementioned compounds in high concentrations in water and therefore substitute commonly used solvents s...
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Personal Name(s): | Schlüpen, Julia (Corresponding author) |
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Contributing Institute: |
Angewandte Physikalische Chemie; ICG-7 |
Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
2001
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Physical Description: |
X, 109 p. |
Dissertation Note: |
Düsseldorf, Univ., Diss., 2001 |
Document Type: |
Book Dissertation / PhD Thesis |
Research Program: |
Grundlagen der Schadstoffisolierung und -behandlung |
Series Title: |
Berichte des Forschungszentrums Jülich
3893 |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
For the electropolymerizable aromatic heterocycles thiophene, 3-methoxythiophene and 3,4- ethylenedioxythiophene (EDT) microemulsions were developed . These microemulsions allow to dissolve the aforementioned compounds in high concentrations in water and therefore substitute commonly used solvents such as acetonitrile . Isothermal phase diagrams of the components 0,5 M aqueous lithiumperchlorate, aromatic heterocycle, and nonionic surfactant were developed . Since the used oils are very polar substances, quite hydrophilic surfactants have to be used in order to achieve microemulsions . It was found that the phase diagrams of the différent substances are very similar. However, the substitutes of the oil species have a decisive influence on the formation of liquid crystals. High amounts of surfactant were necessary for the formation of microemulsions . By means of conductivity measurements, viscosity measurements and dynamic light scattering the microemulsions were characterized. It was found that the microemulsion is mainly an oil-in-water system . Obviously the electrolyte ions interact strongly with the surfactant which has complexing properties due to its ethylene oxide groups . Viscosity measurements show that the bicontinuous phase is formed above a >_ 65 % . This result could be proven by means of dynamic light scattering . Moreover, all samples of the system EDT/Lutensol °ON11%lectrolyte which were investigated could be polymerized electrochemically . Current transients show that the deposition on the electrode from the microemulsion with low où content is controlled by diffusion whereas at higher amounts of oil ( > 20 %) it is controlled by the charge-transfer-process through the electrode surface . It was also possible to obtain a film on the electrode from the system 3-methoxythiophene/LutensoloON80/electrolyte . Moreover, the polymerization from a liquid crystal could be achieved. However, the polymerization of thiophene from microemulsion was not possible |