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You searched for +publisher:"University of the Western Cape" +contributor:("Bladergroen, Bernard"). Showing records 1 – 2 of 2 total matches.

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University of the Western Cape

1. Nkuna, Shonny. Development of capacitive deionisation electrodes: optimization of fabrication methods and composition .

Degree: 2017, University of the Western Cape

The objective of this research was to optimize the fabrication methods for and compositions of electrodes for the Membrane Capacitive Deionisation (MCDI) system. Two electrode fabrication methods were developed, namely a spray coating- and a casting method. The compositions of the electrodes were varied yielding a total of 14 different electrode in an attempt to optimize the fabrication methods and compositions of the electrodes. Three activated carbons were utilized in this study, TOB, YP50F and YP80F, these activated carbons have different surface areas and porosity therefore were affected different by the materials added in the ink. Carbon black and carbon nanotubes were used as conductivity additives to enhance the conductivity of the electrodes. Lastly a polymer binder was added to increase the mechanical integrity of the electrode, this polymer was typically PVDF. For some electrodes, PVDF was replaced with ion exchange polymers in an attempt to provide ion conductive properties to the electrodes. To establish the charge capacity of the electrodes Cyclic Voltammetry was used, BET analysis evaluated the surface area and porosity of the raw materials and fabricated electrodes. Scanning Electron Microscopy was used to verify surface morphology and uniformity. Ion adsorption capacity measurements were performed using a specially designed MCDI cell. The objectives of this study were achieved, the fabrication methods were optimized with the casting method producing superior electrodes. Apart from fulfilling the research objectives, the current research work generated significant scientific value by revealing how the production method impacts the electrode's surface area and electrode adsorption capacity. Advisors/Committee Members: Bladergroen, Bernard (advisor).

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Nkuna, S. (2017). Development of capacitive deionisation electrodes: optimization of fabrication methods and composition . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/5980

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Nkuna, Shonny. “Development of capacitive deionisation electrodes: optimization of fabrication methods and composition .” 2017. Thesis, University of the Western Cape. Accessed January 22, 2020. http://hdl.handle.net/11394/5980.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Nkuna, Shonny. “Development of capacitive deionisation electrodes: optimization of fabrication methods and composition .” 2017. Web. 22 Jan 2020.

Vancouver:

Nkuna S. Development of capacitive deionisation electrodes: optimization of fabrication methods and composition . [Internet] [Thesis]. University of the Western Cape; 2017. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/11394/5980.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nkuna S. Development of capacitive deionisation electrodes: optimization of fabrication methods and composition . [Thesis]. University of the Western Cape; 2017. Available from: http://hdl.handle.net/11394/5980

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of the Western Cape

2. Bridget, Tshamano Matamela. Synthesis & characterization of yttria-stabilised zirconia (YSZ) hollow fibre support for Pd based membrane .

Degree: 2013, University of the Western Cape

Inorganic based membranes which have a symmetric/asymmetric structure have been produced using an immersion induced phase inversion and sintering method. An organic binder solution (dope) containing yttria-stabilised zirconium (YSZ) particles is spun through a triple orifice spinneret to form a hollow fibre precursor, which is then sintered at elevated temperatures to form a ceramic support. The phase inversion process for the formation of hollow fibre membranes was studied in order to produce the best morphological structure/support for palladium based membranes. The spinning parameters, particle size, non-solvent concentration, internal coagulant as well as the calcination temperature were investigated in order to determine the optimum values. Sintering temperature was also investigated, which would yield a sponge-like structure with an optimized permeability, while retaining a smooth outer surface. The supports produced by phase inversion were characterized in terms of dimension by mercury porosimetry, compressed air permeability, Surface Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). The morphology of the produced ceramic support showed either dense or porous characteristics governed by the dynamics of the phase inversion process. The particle size of YSZ was examined in order to decrease the amount of agglomerates in the spinning suspension. Zetasizer tests indicated that at 15 minutes, the ultrasonic bath effectively homogenised the YSZ particles and prohibited soft agglomerates from reforming in the spinning suspension. In this study, an increase in air gap had no noticeable effect on the finger like voids but it had a considerable effect on both the inner diameter (ID) and outer diameter (OD) of the green fibres, while an increase in bore liquid flow rate and extrusion pressure promoted viscous fingering and significant effect on the ID and OD of the fibres, respectively. There was a decrease in porosity and permeability with increasing sintering temperature, addition of water concentration in the spinning suspension and varying N-methylpyrrolidone (NMP) aqueous solution of the internal coagulant. The amount of YSZ added to the starting suspension influenced the properties of the support structure. Viscous deformation was observed for dope with lower particle loading thus resulted in the formation of cracks and defects during sintering. Advisors/Committee Members: Onani, Martin (advisor), Bladergroen, Bernard (advisor).

Subjects/Keywords: Yttria-stabilised zirconium (YSZ); Hollow fibre membranes; Palladium based membranes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bridget, T. M. (2013). Synthesis & characterization of yttria-stabilised zirconia (YSZ) hollow fibre support for Pd based membrane . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/4531

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Bridget, Tshamano Matamela. “Synthesis & characterization of yttria-stabilised zirconia (YSZ) hollow fibre support for Pd based membrane .” 2013. Thesis, University of the Western Cape. Accessed January 22, 2020. http://hdl.handle.net/11394/4531.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Bridget, Tshamano Matamela. “Synthesis & characterization of yttria-stabilised zirconia (YSZ) hollow fibre support for Pd based membrane .” 2013. Web. 22 Jan 2020.

Vancouver:

Bridget TM. Synthesis & characterization of yttria-stabilised zirconia (YSZ) hollow fibre support for Pd based membrane . [Internet] [Thesis]. University of the Western Cape; 2013. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/11394/4531.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bridget TM. Synthesis & characterization of yttria-stabilised zirconia (YSZ) hollow fibre support for Pd based membrane . [Thesis]. University of the Western Cape; 2013. Available from: http://hdl.handle.net/11394/4531

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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