They can be used in gas separation membranes, in which a porous substrate is covered by a thin zeolite layer. Zeolites have been investigated due to their unique crystal structures. The results demonstrate that Al-containing ZSM-58 zeolite membranes with high CO 2 permeance and CO 2/CH 4 selectivity and minimal cracking can be produced by using RTP. The condensation of silanol forms results in the formation of siloxane bonds and stronger resistance to thermal stress therefore, RTP caused crack suppression in Al-containing ZSM-58 membranes. Al-containing ZSM-58 zeolites had higher silanol concentrations than all-silica zeolites, confirming many silanol condensations by RTP. ZSM-58 crystals and membranes with various Si/Al molar ratios were analyzed by using Fourier-transform infrared (FTIR) spectroscopy to confirm the effects of RTP treatment. An all-silica ZSM-58 membrane without cracks was obtained by only using the ozone detemplating method. Using the developed method, an Al-containing ZSM-58 membrane without cracks was obtained, along with complete template removal by RTP, and it had higher CO 2/CH 4 selectivity. Moreover, we verified the influence of RTP before performing conventional thermal calcination (CTC) on ZSM-58 membranes with various silica-to-aluminum (Si/Al) molar ratios. In this study, Al-containing ZSM-58 zeolite membranes with DDR topology were prepared by rapid thermal processing (RTP), with the aim of developing a reproducible method for preparing DDR zeolite membrane without cracks. Available to authenticated members of The University of Auckland.The synthesis of DDR-type zeolite membranes faces the problem of cracks that occur on the zeolite membrane due to differences in the thermal expansion coefficient between zeolite and the porous substrate during the detemplating process. Previously published items are made available in accordance with the copyright policy of the publisher. Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. The items presented in this thesis provide additional information regarding potential improvements of the optrode Thesis - University of Auckland In this research, the more intricate details of the optrode setup were investigated. Results of the optrode setup monitoring bacteria distribution and concentration are also presented to demonstrate the how the optrode setup can be used for different biomedical applications. ![]() Existing deconvolution algorithms were reviewed and a new method utilising the open-source software Fityk and the Levenberg-Marquardt optimisation was tested as an attempt to make the deconvolution process more versatile and applicable to a wider range of spectral shapes. Before the bacteria population can be quantified, the acquired spectrum needs to be separated into individual spectral components when several bacteria are measured together. ![]() ![]() Existing experiment protocols were examined to isolate how variations in spectrum are introduced, and also how they can be avoided. To increase the detection limit of the setup, variations in spectral shape and amplitude of the acquired spectra need to be minimised. The choice of fibre to make the probes can be decided depending on specific applications. Photon propagation is modelled by Monte Carlo simulations, allowing the laser illumination volume to be visualised and the intensity decrease of the beam profiles to be plotted. The aim of this thesis was to make improvements on the optrode setup, first by understanding how different fibre parameters such as the numerical aperture and core diameter affect the illumination volume of the fibre probe. The measured spectra can then be used to quantify the amount of bacteria present. The optrode setup is an all fibre real time spectroscopic setup which allows in situ measurements of the bacteria fluorescence emission spectrum. To allow monitoring, these bacteria can be labelled with fluorescent proteins. Show simple item record dc.contributor.advisorįull text is available to authenticated members of The University of Auckland only.īacteria can be used to aid bioremediation and it is crucial to monitor the bacteria involved to gain feedback on the effectiveness of the remediation process.
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