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Membrane characterisation by means of electrochemical impedance spectroscopy

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dc.contributor.author Louw HJ en
dc.date.accessioned 2016-09-22T07:17:25Z
dc.date.available 2016-09-22T07:17:25Z
dc.date.submitted 1998 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/11326
dc.description.abstract Current methods for characterising membranes are all invasive. This research endeavours to investigate the potential of Electrochemical Impedance Spectroscopy (EIS) as a non-invasive (non-destructive) characterisation technique. The principle on which this investigation is based derives from the fact that an electrolyte / membrane interphase can be simulated (and electrochemically seen) as a discontinuity. This discontinuity present itself as a definite electrochemical spectrum obtained from a wave generator with a known frequency range. The investigation shows that the response of hydrophilic and hydrophobic membranes yield completely different and characteristic results when compared to a RC-circuit postulated as model. Large differences in the resistive component of the impedance distinguish the two membrane types and this is complemented by a meaningfully different electrical capacitance for each membrane. At the outset it was expected to derive these differences and possibly also to make some calculated prediction regarding some physical properties of the membrane itself as well as some properties of the associated electrolyte. The latter idea proved to have substantial potential but a lack of suitably powerful equipment (frequency generated) prohibited a logical conclusion to this latter part of the study. Future research, however, could wisely be directed to resolve some of these unanswered questions. en
dc.language English en
dc.subject Chemical engineering en
dc.title Membrane characterisation by means of electrochemical impedance spectroscopy en
dc.type Masters degree en
dc.description.degree MEng en

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