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The characterization of membranes and their processes is of primary interest for the optimization of existing and the development of new separation processes. One method that is gaining increasing interest for the characterization of membranes is using alternating currents of different frequencies to measure the complex electrical resistance: the impedance. Information on the membrane structure may be gained by building up equivalent circuit models representing the physical structure of the membrane and fitting the impedance measurement data to the models. This method named impedance spectroscopy (EIS) has the great benefit of being noninvasive, highly accurate and simple operability. In this thesis new applications for the usage of impedance spectroscopy in the field of membrane science were investigated. New methods for membrane and membrane process characterization by EIS have been introduced for: - The characterization of porous hollow fiber membranes - The on-line monitoring of the cake layer structure during colloidal fouling on porous membranes - The characterization of the pore size distribution - A new integrity testing and characterization of composite hollow fiber membranes So in this thesis a series of new methods for the characterization of membranes by impedance spectroscopy has been introduced. Therefore the work in this thesis enables a more comprehensive analysis of the membranes and membrane processes.
Buchkauf
Characterization of membranes and membrane processes by electrical impedance spectroscopy, Sebastian Bannwarth
- Sprache
- Erscheinungsdatum
- 2017
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- Titel
- Characterization of membranes and membrane processes by electrical impedance spectroscopy
- Sprache
- Englisch
- Autor*innen
- Sebastian Bannwarth
- Verlag
- Shaker Verlag
- Erscheinungsdatum
- 2017
- ISBN10
- 3844050582
- ISBN13
- 9783844050585
- Kategorie
- Skripten & Universitätslehrbücher
- Beschreibung
- The characterization of membranes and their processes is of primary interest for the optimization of existing and the development of new separation processes. One method that is gaining increasing interest for the characterization of membranes is using alternating currents of different frequencies to measure the complex electrical resistance: the impedance. Information on the membrane structure may be gained by building up equivalent circuit models representing the physical structure of the membrane and fitting the impedance measurement data to the models. This method named impedance spectroscopy (EIS) has the great benefit of being noninvasive, highly accurate and simple operability. In this thesis new applications for the usage of impedance spectroscopy in the field of membrane science were investigated. New methods for membrane and membrane process characterization by EIS have been introduced for: - The characterization of porous hollow fiber membranes - The on-line monitoring of the cake layer structure during colloidal fouling on porous membranes - The characterization of the pore size distribution - A new integrity testing and characterization of composite hollow fiber membranes So in this thesis a series of new methods for the characterization of membranes by impedance spectroscopy has been introduced. Therefore the work in this thesis enables a more comprehensive analysis of the membranes and membrane processes.