ORCID Profile
0000-0003-0480-8587
Current Organisation
The University of Newcastle
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Structural Engineering | Infrastructure Engineering and Asset Management | Civil Engineering | Nanomaterials | Civil Geotechnical Engineering | Biomaterials | Nanotechnology | Ship and Platform Structures | Materials Engineering | Metals and Alloy Materials | Nanoscale Characterisation |
Oil and Gas Extraction | Metals (e.g. Composites, Coatings, Bonding) | Energy Services and Utilities | Polymeric Materials (e.g. Paints) | Civil Construction Design | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Expanding Knowledge in the Biological Sciences | Expanding Knowledge in Technology
Publisher: Springer Science and Business Media LLC
Date: 23-03-2007
Publisher: Trans Tech Publications, Ltd.
Date: 23-05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.783-786.1269
Abstract: Magnesium alloys are attractive for use as biodegradable materials for temporary implant applications. However, the high localized degradation of magnesium alloys in physiological conditions is a major concern, which can affect the mechanical integrity of the implant during service. Calcium phosphate (CaP) coating is a suitable method to delay the initiation of localized attack in magnesium alloys. This paper will discuss the challenges and opportunities in electrochemically coating CaP on magnesium and its magnesium alloys for biodegradable implant applications.
Publisher: Springer Science and Business Media LLC
Date: 09-2006
Publisher: Elsevier BV
Date: 09-2012
Publisher: Informa UK Limited
Date: 21-12-2015
Publisher: Elsevier BV
Date: 02-2011
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier
Date: 2011
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 09-2013
Publisher: Wiley
Date: 08-08-2019
Publisher: Elsevier
Date: 2015
Publisher: Trans Tech Publications, Ltd.
Date: 04-2009
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.618-619.83
Abstract: In this study, an attempt was made to enhance the degradation resistance of magnesium alloys for potential biodegradable implant applications through surface treatment. AZ91 magnesium alloy was taken as the test s le and was alkali-treated for two different periods of time and then the in vitro degradation behaviour of the alloy was studied using electrochemical impedance spectroscopy and polarization techniques in simulated body fluid. The study suggests that alkali-treatment reduces the degradation rate in AZ91 magnesium alloy.
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 06-2020
Publisher: Trans Tech Publications, Ltd.
Date: 10-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.138.1
Abstract: This paper brings out the developments on heat-treatment and alloying to improve the stress corrosion cracking (SCC) behavior of 7010 Al-alloy. The role of microstructures including the grain boundary precipitates and recystallized grains and the relation of intergranular corrosion (IGC) on the SCC behavior of 7010 Al-alloy have been discussed.
Publisher: Elsevier BV
Date: 05-2014
Publisher: Springer Science and Business Media LLC
Date: 15-11-2017
DOI: 10.1038/S41598-017-15873-W
Abstract: In this study, the biocompatibility and in vitro degradation behaviour of a commercial zinc-based alloy (Zn-5 Al-4 Mg) were evaluated and compared with that of pure zinc for temporary orthopaedic implant applications. Biocompatibility tests were conducted using human alveolar lung epithelial cells (A549), which showed that the zinc alloy exhibits similar biocompatibility as compared to pure zinc. In vitro degradation evaluation was performed using weight loss and electrochemical methods in simulated body fluid (SBF) at 37 °C. Weight loss measurements revealed that the degradation of the zinc alloy was slightly lower during the initial immersion period (1–3 days), but marginally increased after 5 and 7 days immersion as compared to pure zinc. Potentiodynamic polarisation experiments showed that the zinc alloy exhibits higher degradation rate than pure zinc. However, electrochemical impedance spectroscopy analysis suggests that pure zinc is susceptible to localized degradation, whereas the zinc alloy exhibited passivation behaviour. Post-degradation analysis revealed localized degradation in both pure zinc and the zinc alloy.
Publisher: Canadian Science Publishing
Date: 08-2017
Abstract: An experimental study on electrokinetic improvement of dredged marine sediments to accelerate their sedimentation for land reclamation purposes is presented. Electrokinetic stabilization is currently used to improve soils however, its use on soils with marine sediments with low permeability is still questionable due to the deterioration of anodes caused by an electrolysis reaction. A number of traditional methods are employed in literature to reduce the corrosion degradation of metals, such as painting, galvanizing, and conversion coating. Conducting polymers, e.g., polyaniline, are of engineering interest due to their properties such as ease of preparation and their high environmental stability in protecting metals from corrosion. For this purpose, the anodes used in the electrokinetic testing cell herein were coated with polyaniline to investigate the effect on electrokinetic stabilization of the dredged mud. Two series of experiments were performed using a polyaniline-coated galvanized steel anode, and two series of experiments with noncoated galvanized steel anodes were also carried out as a control. Depending on the applied voltage, the settlement and electroosmotic permeability of the dredged mud varied during the process. Polyaniline coating increased the power consumption during the electrokinetic stabilization compared to the case where the same electric potential was applied using the uncoated electrodes. However, when 5 V electric potential was applied to the soil through the polyaniline coated anode, its settlement and electroosmotic permeability were equivalent to what was observed with the 30 V electric potential applied through the noncoated anode, with 3 times less energy consumption.
Publisher: Elsevier BV
Date: 2010
Publisher: Elsevier BV
Date: 2007
Publisher: Elsevier BV
Date: 06-2022
Publisher: The Electrochemical Society
Date: 2005
DOI: 10.1149/1.1859676
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 03-2010
Publisher: Springer International Publishing
Date: 2022
Publisher: Wiley
Date: 07-06-2014
DOI: 10.1002/JBM.A.35247
Abstract: The aim of this work was to understand the effect of microgalvanic degradation on secondary phase particles in magnesium alloys under in vitro condition. Pure magnesium and Mg17 Al12 (β-phase) were galvanically coupled in simulated body fluid and the degradation behavior was studied using electrochemical impedance spectroscopy. The galvanic coupling produced a phosphate/carbonate layer on the β-phase, which initially increased the degradation resistance. However, the deposited phosphate/carbonate layer rapidly degraded once the galvanic coupling was removed, and β-phase exhibited similar degradation resistance to that of pure magnesium. A phenomenological model has been presented, demonstrating the galvanic coupling effect.
Publisher: IOP Publishing
Date: 03-06-2011
DOI: 10.1088/1748-6041/6/4/045003
Abstract: The mechanical integrity of resorbable implants during service, especially in load bearing orthopaedic applications, is critical. The high degradation rate of resorbable magnesium and magnesium-based implants in body fluid may potentially cause premature in-service failure. In this study, a magnesium alloy (AZ91) was potentiostatically coated with hydroxyapatite at different cathodic voltages in an attempt to enhance the mechanical integrity. The mechanical integrity of the uncoated and hydroxyapatite coated alloys was evaluated after in vitro testing of the coated s les in simulated body fluid (SBF). The uncoated alloy showed 40% loss in the mechanical strength after five days exposure to SBF. However, the hydroxyapatite coated alloy exposed to SBF showed 20% improvement in the mechanical strength as compared to that of the uncoated alloy. The alloy coated potentiostatically at -2 V performed better than the -3 V coated alloy. The cross-sectional analysis of the coatings revealed relatively uniform coating thickness for the -2 V coated alloy, whereas the -3 V coated alloy exhibited areas of uneven coating. This can be attributed to the increase in hydrogen evolution on the alloy during -3 V coating as compared to -2 V coating. The scanning electron micrographs of the in vitro tested alloy revealed that hydroxyapatite coating significantly reduced the localized corrosion of the alloy, which is critical for better in-service mechanical integrity. Thus, the study suggests that the in vitro mechanical integrity of resorbable magnesium-based alloy can be improved by potentiostatic hydroxyapatite coating.
Publisher: Elsevier
Date: 2011
Publisher: Trans Tech Publications, Ltd.
Date: 03-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.753.489
Abstract: In this study, the role of recystrallized grains on the environment-assisted cracking (EAC) susceptibility of a high strength aluminium alloy (Al-Zn-Mg-Cu) was examined using slow strain rate testing (SSRT) and U-bend test methods in chloride-containing solution. Experimental results suggest that the recrystallized grains in the peak-aged alloy are more prone to EAC. However, by altering the morphology and chemistry of the grain boundary precipitates of the recrystallized grains by overaging heat treatment, the alloy susceptibility to EAC reduced significantly.
Publisher: Springer Science and Business Media LLC
Date: 25-04-2015
DOI: 10.1007/S12311-015-0672-X
Abstract: MicroRNAs (miRNAs) are important regulators of cerebellar function and homeostasis. Their deregulation results in cerebellar neuronal degeneration and spinocerebellar ataxia type 1 and contributes to medulloblastoma. Canonical miRNA processing involves Dicer, which cleaves precursor miRNAs into mature double-stranded RNA duplexes. In order to address the role of miRNAs in cerebellar granule cell precursor development, loxP-flanked exons of Dicer1 were conditionally inactivated using the granule cell precursor-specific Atoh1-Cre recombinase. A reduction of 87% in Dicer1 transcript was achieved in this conditional Dicer knockdown model. Although knockdown resulted in normal survival, mice had disruptions to the cortical layering of the anterior cerebellum, which resulted from the premature differentiation of granule cell precursors in this region during neonatal development. This defect manifested as a thinner external granular layer with ectopic mature granule cells, and a depleted internal granular layer. We found that expression of the activator components of the Hedgehog-Patched pathway, the Gli family of transcription factors, was perturbed in conditional Dicer knockdown mice. We propose that loss of Gli2 mRNA mediated the anterior-restricted defect in conditional Dicer knockdown mice and, as proof of principle, were able to show that miR-106b positively regulated Gli2 mRNA expression. These findings confirm the importance of miRNAs as positive mediators of Hedgehog-Patched signalling during granule cell precursor development.
Publisher: Wiley
Date: 08-07-2018
Abstract: Recent developments in rechargeable battery technology have seen a shift from the well-established Li-ion technology to new chemistries to achieve the high energy density required for extended range electric vehicles and other portable applications, as well as low-cost alternatives for stationary storage. These chemistries include Li-air, Li-S, and multivalent ion technologies including Mg
Publisher: Elsevier BV
Date: 04-2011
Publisher: Springer Science and Business Media LLC
Date: 22-09-2007
Publisher: American Chemical Society (ACS)
Date: 16-07-2019
Publisher: Elsevier BV
Date: 10-2018
DOI: 10.1016/J.ACTBIO.2018.08.030
Abstract: Magnesium (Mg) and its alloys have become a research frontier in biodegradable materials owing to their superior biocompatibility and excellent biomechanical compatibility. However, their high degradation rate in the physiological environment should be well tackled prior to clinical applications. This review summarizes the latest progress in the development of polymeric coatings on biodegradable Mg alloys over the last decade, regarding preparation strategies for polylactic acid (PLA), poly (latic-co-glycolic) acid (PLGA), polycaprolactone (PCL), polydopamine (PDA), chitosan (CS), collagen (Col) and their composite, and their performance in terms of corrosion resistance and biocompatibility. Feasible perspectives and developing directions of next generation of polymeric coatings with respect to biomedical Mg alloys are briefly discussed. Magnesium (Mg) and its alloys have become a research frontier in biodegradable materials owing to their superior biocompatibility and suitable biomechanical compatibility. However, the principal drawback of Mg-based implants is their poor corrosion resistance in physiological environments. Hence, it is vital to mitigate the degradation/corrosion behavior of Mg alloys for safe biomedical deployments. This review summarizes the latest progress in development of polymeric coatings on biomedical Mg alloys regarding preparation strategy, corrosion resistance and biocompatibility, including polylactic acid (PLA), poly (latic-co-glycolic) acid (PLGA), polycaprolactone (PCL), chitosan (CS), polydopamine (PDA), collagen (Col) and their composite. In addition, functionalized polymer coatings with Mg alloys exhibits a promising prospect owing to their ability of degradation along with biocompatibility, self-healing, drug-delivery and osteoinduction.
Publisher: Springer Science and Business Media LLC
Date: 04-02-2019
Publisher: Elsevier BV
Date: 10-2007
Publisher: Elsevier BV
Date: 2015
DOI: 10.1016/J.MSEC.2014.10.038
Abstract: In this study, the in vitro degradation behaviour of titanium-tantalum (Ti-Ta) alloys (10-30 wt.% Ta) was investigated and compared with conventional implant materials, i.e., commercially pure titanium (Cp-Ti) and titanium-aluminium-vanadium (Ti6Al4V) alloy. Among the three Ti-Ta alloys studied, the Ti20Ta (6.3×10(-4) mm/y) exhibited the lowest degradation rate, followed by Ti30Ta (1.2×10(-3) mm/y) and Ti10Ta (1.4×10(-3) mm/y). All the Ti-Ta alloys exhibited lower degradation rate than that of Cp-Ti (1.8×10(-3) mm/y), which suggests that Ta addition to Ti is beneficial. As compared to Ti6Al4V alloy (8.1×10(-4) mm/y), the degradation rate of Ti20Ta alloy was lower by ~22%. However, the Ti30Ta alloy, which has closer elastic modulus to that of natural bone, showed ~48% higher degradation rate than that of Ti6Al4V alloy. Hence, to improve the degradation performance of Ti30Ta alloy, an intermediate thin porous layer was formed electrochemically on the alloy followed by calcium phosphate (CaP) electrodeposition. The coated Ti30Ta alloy (3.8×10(-3) mm/y) showed ~53% lower degradation rate than that of Ti6Al4V alloy. Thus, the study suggests that CaP coated Ti30Ta alloy can be a viable material for load-bearing permanent implants.
Publisher: Elsevier BV
Date: 2023
Publisher: MDPI AG
Date: 03-01-2018
DOI: 10.3390/MET8010030
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA05278F
Abstract: The PEO-CaP coating produced on magnesium metal using an unconventional electrolyte enhanced the degradation resistance and provided excellent cytocompatibility.
Publisher: Springer International Publishing
Date: 2022
Publisher: Springer Science and Business Media LLC
Date: 27-07-2016
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 07-2008
Publisher: American Chemical Society (ACS)
Date: 06-03-2017
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 05-2022
DOI: 10.1016/J.WASMAN.2022.04.029
Abstract: In this study, the corrosion inhibition efficiency of thioridazine hydrochloride (TH), an antipsychotic drug, on mild steel (commonly used pipeline material in the oil and gas industry) in 1 M hydrochloric acid (HCl) was evaluated using electrochemical techniques and weight loss method. Electrochemical impedance spectroscopy (EIS) results suggest that TH significantly enhances the polarization resistance (R
Publisher: Elsevier BV
Date: 05-2022
Publisher: Elsevier BV
Date: 12-2022
Publisher: No publisher found
Date: 2016
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 06-2008
Publisher: Elsevier BV
Date: 03-2013
DOI: 10.1016/J.MSEC.2012.10.017
Abstract: In this study, a magnesium alloy (AZ91) was coated with calcium phosphate using potentiostatic pulse-potential and constant-potential methods and the in vitro corrosion behaviour of the coated s les was compared with the bare metal. In vitro corrosion studies were carried out using electrochemical impedance spectroscopy and potentiodynamic polarization in simulated body fluid (SBF) at 37 °C. Calcium phosphate coatings enhanced the corrosion resistance of the alloy, however, the pulse-potential coating performed better than the constant-potential coating. The pulse-potential coating exhibited ~3 times higher polarization resistance than that of the constant-potential coating. The corrosion current density obtained from the potentiodynamic polarization curves was significantly less (~60%) for the pulse-deposition coating as compared to the constant-potential coating. Post-corrosion analysis revealed only slight corrosion on the pulse-potential coating, whereas the constant-potential coating exhibited a large number of corrosion particles attached to the coating. The better in vitro corrosion performance of the pulse-potential coating can be attributed to the closely packed calcium phosphate particles.
Publisher: Elsevier BV
Date: 06-2012
Publisher: Elsevier BV
Date: 02-2015
DOI: 10.1016/J.COLSURFB.2015.01.015
Abstract: In this study, the influence of living cells (L929) on the in vitro degradation behaviour of a magnesium-calcium alloy was investigated using an electrochemical technique in the Eagle's minimum essential medium (EMEM) with 10% foetal bovine serum (FBS) under 5% CO2 atmosphere. The degradation of the alloy increased significantly in the medium containing the cells as compared to that without cells. Post-degradation analysis revealed localized degradation in the vicinity of the cells. It is suggested that the cell metabolic activity has induced local pH drop and as a result increased the alloy degradation.
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 05-2008
Publisher: Elsevier BV
Date: 08-2013
Publisher: Elsevier BV
Date: 12-2018
Publisher: Wiley
Date: 20-11-2014
Publisher: Elsevier BV
Date: 08-2015
Publisher: Informa UK Limited
Date: 23-06-2017
Publisher: Elsevier BV
Date: 11-2004
Publisher: American Chemical Society (ACS)
Date: 03-02-2017
Publisher: Wiley
Date: 24-09-2012
DOI: 10.1002/JBM.A.34423
Abstract: In this study, an attempt was made to improve the packing density of calcium phosphate (CaP) coating on a magnesium alloy by tailoring the coating solution for enhanced degradation resistance of the alloy for implant applications. An organic solvent, ethanol, was added to the coating solution to decrease the conductivity of the coating solution so that hydrogen bubble formation/bursting reduces during the CaP coating process. Experimental results confirmed that ethanol addition to the coating solution reduces the conductivity of the solution and also decreases the hydrogen evolution/bubble bursting. In vitro electrochemical experiments, that is, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization showed that CaP coating produced in 30% (v/v) ethanol containing coating solution (3E) exhibits significantly higher degradation resistance (i.e., ~50% higher polarization resistance and ~60% lower corrosion current) than the aqueous solution coating. Scanning electron microscope (SEM) analysis of the coatings revealed that the packing of 3E coating was denser than that of aqueous coating, which can be attributed to the lower hydrogen evolution in the former than in the latter. Further increase in the ethanol content in the coating solution was not beneficial in fact, the coating produced in 70% (v/v) ethanol containing solution (7E) showed degradation resistance much inferior to that of the aqueous coating, which is due to low thickness of 7E coating.
Publisher: Wiley
Date: 20-03-2020
DOI: 10.1002/MDS3.10070
Publisher: Trans Tech Publications, Ltd.
Date: 06-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.690.385
Abstract: The study suggests that the rare-earths containing magnesium alloys ZE41 and QE22 exhibit a poorer corrosion resistance than the AZ80 magnesium alloy. Electrochemical experiments showed that the two rare-earths containing alloys are highly susceptible to localized corrosion. Post corrosion analysis revealed intergranular and pitting corrosion in ZE41, whereas QE22 alloy underwent only pitting corrosion.
Publisher: Elsevier BV
Date: 09-2014
Publisher: Elsevier
Date: 2011
Publisher: Elsevier BV
Date: 06-2014
Publisher: Wiley
Date: 31-07-2020
DOI: 10.1002/MDS3.10108
Publisher: Elsevier BV
Date: 05-2008
DOI: 10.1016/J.BIOMATERIALS.2008.02.003
Abstract: The successful applications of magnesium-based alloys as degradable orthopaedic implants are mainly inhibited due to their high degradation rates in physiological environment and consequent loss in the mechanical integrity. This study examines the degradation behaviour and the mechanical integrity of calcium-containing magnesium alloys using electrochemical techniques and slow strain rate test (SSRT) method, respectively, in modified-simulated body fluid (m-SBF). Potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) results showed that calcium addition enhances the general and pitting corrosion resistances of magnesium alloys significantly. The corrosion current was significantly lower in AZ91Ca alloy than that in AZ91 alloy. Furthermore, AZ91Ca alloy exhibited a five-fold increase in the surface film resistance than AZ91 alloy. The SSRT results showed that the ultimate tensile strength and elongation to fracture of AZ91Ca alloy in m-SBF decreased only marginally (approximately 15% and 20%, respectively) in comparison with these properties in air. The fracture morphologies of the failed s les are discussed in the paper. The in vitro study suggests that calcium-containing magnesium alloys to be a promising candidate for their applications in degradable orthopaedic implants, and it is worthwhile to further investigate the in vivo corrosion behaviour of these alloys.
Publisher: The Electrochemical Society
Date: 23-07-2018
Abstract: In molten carbonate fuel cells (MCFC), oxidation of solid carbon fuels takes place at extended three-phase boundary (TPB) as molten carbonate electrolyte enhances the reaction interface in the anode compartment of the cell and facilitates diffusion of reactants. It also acts as an electrochemical mediator in oxidising carbon or carbon monoxide to carbon dioxide. Several studies have already been conducted to improve electrolyte’s performance in anode by either changing its composition or adding additives, i.e. metal oxides. Electrolyte composition effect, in terms of using different metal carbonates and their quantity in the mixture, on the performance of MCFC has been extensively investigated in the literature. However, comparing different additives effect on the overall performance of a cell using available data in the literature is not viable. This is because of lack of consistency in previous studies’ experimental conditions and specifically in anode composition. Also, there is not an agreement on mechanism that metal oxides improve the performance of MCFCs. In the current study, two different percentages (5 and 10 wt%) of SnO 2 , CeO 2 , Fe 2 O 3 , and Mn 2 O 3 were used as additives to electrolyte and fuel mixture of the anode. Performances of the full cell with different additives were evaluated in the same conditions using polarisation (IV) and electrochemical impedance spectroscopy (EIS) tests. In addition, thermal gravimetric analysis (TGA) and differential thermal analysis (DTA) were performed on anode slurry s les to further investigate details of the interactions between the anode electrolyte components. Based on the results, we provide a clear comparison on the effectiveness of these metal oxides in improving the cell performance and also suggest a mechanism that metal oxides enhance performance of anode in molten carbonate fuel cells.
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 07-2007
Publisher: Springer Science and Business Media LLC
Date: 06-09-2011
DOI: 10.1007/S10856-011-4429-X
Abstract: In this study, the in vitro degradation behaviour of a friction stir processed AZ31 magnesium alloy was investigated. Electrochemical experiments in simulated body fluid suggest that friction stir processing marginally enhances the degradation resistance of the alloy, which could be attributed to the dissolution of secondary phase particles. Homogenisation of the microstructure reduces galvanic corrosion. It is envisaged that the beneficial effect would be more pronounced for magnesium alloys which contain high volume fraction of galvanic corrosion inducing secondary phase particles.
Publisher: Wiley
Date: 07-12-2013
Publisher: Wiley
Date: 14-09-2009
DOI: 10.1002/JBM.A.32576
Abstract: To understand the in vitro degradation mechanism of magnesium alloy, electrochemical experiments viz., electrochemical impedance spectroscopy and potentiodynamic polarization, were carried out on AZ91 magnesium alloy under different experimental conditions. The study suggests: (i) the body temperature decreases significantly the corrosion resistance of the alloy, (ii) alkali-treatment of the alloy enhances the corrosion resistance, and (iii) although chloride in simulated body fluid minimizes the corrosion resistance, the presence of other constituents viz., phosphate, calcium, and carbonate, enhances the film forming tendency and hence increases the corrosion resistance of the alloy.
Publisher: Elsevier
Date: 2015
Publisher: Elsevier BV
Date: 2023
DOI: 10.1016/J.JCIS.2022.10.087
Abstract: This work reports the design and preparation of novel organic (polyvinyl alcohol, PVA)-inorganic (neodymium nitrate, Nd(NO
Publisher: Association for Materials Protection and Performance (AMPP)
Date: 10-2003
DOI: 10.5006/1.3287709
Publisher: Walter de Gruyter GmbH
Date: 12-2009
Publisher: Elsevier BV
Date: 09-2017
DOI: 10.1016/J.WASMAN.2017.05.045
Abstract: The study suggests that biowastes (eggshells and urine) can be potentially used as precursors to produce hydroxyapatite (HAp) biomaterial in a simple chemical process. A batch reactor was used in this work to produce HAp powder from eggshells and synthetic urine (SU). Fine powder of calcined eggshells was dissolved in water to produce aqueous calcium hydroxide. The solution was then mixed with concentrated SU in stoichiometric amounts corresponding to HAp (Ca/P molar ratio∼1.67). The initial pH of the solution was alkaline (pH∼8.5) and particles formed rapidly with slight mixing. Stirring the turbid solution for a longer period (72h) did not show any visual change, but the particle size decreased slightly. When the pH of the solution was adjusted to 5, the solution was initially clear, but particle formation was apparent after 48h stirring. It was noticed that at a slow stirring speed (100rpm), film formation occurred on the solution, whereas at a higher stirring speed (500rpm) no such film formation was observed. X-ray diffraction (XRD) analysis confirmed that the particles (formed at 500rpm) were an amorphous calcium phosphate (CaP). Alkaline treatment at 80°C for 2h converted the amorphous CaP into HAp. Inductively coupled plasma mass spectrometry (ICP-MS) analysis of the particles (formed at 500rpm) suggested that they are calcium-deficient HAp (Ca/P molar ratio 1.58).
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 02-2014
Publisher: Elsevier BV
Date: 09-2013
Publisher: Elsevier BV
Date: 12-2012
Publisher: IOP Publishing
Date: 05-11-2014
Publisher: Elsevier BV
Date: 11-2015
Publisher: Informa UK Limited
Date: 02-01-2016
Publisher: The Electrochemical Society
Date: 09-2019
Abstract: The direct carbon fuel cell (DCFC) is a future energy technology which is an efficient process for electrical energy generation from carbon-based sources. This technology has an extremely high theoretical efficiency due to favourable thermodynamics of the electro-oxidation reactions in the process. However, several technical challenges exist which must be addressed before the technology can be commercialized. One of the challenges is the corrosion of metal parts in the cell which limits the service life of the unit. In recent year, research on the development of new alloys and surface engineering have been done to address the corrosion issues in molten carbonate fuel cells. However, the literature on the corrosion behaviour of metals in a slurry system (coal + carbonate) is limited. Austenitic stainless steels are known for their high temperature corrosion resistance and excellent mechanical properties. In this work, the corrosion susceptibility of two types of austenitic stainless steels, i.e. 316L (16 wt.% Cr and 10wt. % Ni) and 235 MA (21 wt.% Cr and 11 wt.% Ni) were compared for fuel cell tank body application. The corrosion behaviour of the two stainless steels were evaluated in a slurry, which contained 20 wt% coal and 80 wt% ternary-eutectic (Li 2 CO 3 : 43.5 mol%, Na 2 CO 3 : 31.5 mol%, and K 2 CO 3 : 25.0 mol%), with nitrogen as a sweep gas at 800⁰C was examined for a 30-day period. The results indicate that the weight gain (due to corrosion product build-up) for both the stainless steels was marginal after 7 day exposure, i.e., 0.4% and 0.5% for 316L and 253 MA, respectively. However, after 30 days exposure, the weight gain increased to 0.98% for 316L, whereas for 253MA the weight gain remained at ~ 0.5%. Thus, the study suggest that 235 MA stainless steel is superior to 316L stainless steel in the coal-carbonate slurry environment. The corrosion mechanisms of the stainless steels will be discussed in the presentation.
Publisher: Elsevier BV
Date: 08-2017
Publisher: Elsevier BV
Date: 10-2008
Publisher: Wiley
Date: 17-12-2010
DOI: 10.1002/JBM.B.31766
Abstract: Applications of magnesium alloys as biodegradable orthopaedic implants are critically dependent on the mechanical integrity of the implant during service. In this study, the mechanical integrity of an AZ91 magnesium alloy was studied using a constant extension rate tensile (CERT) method. The s les in two different geometries that is, circumferentially notched (CN), and circumferentially notched and fatigue cracked (CNFC), were tested in air and in simulated body fluid (SBF). The test results show that the mechanical integrity of the AZ91 magnesium alloy decreased substantially (∼50%) in both the CN and CNFC s les exposed to SBF. Fracture surface analysis revealed secondary cracks suggesting stress corrosion cracking susceptibility of the alloy in SBF.
Publisher: Trans Tech Publications, Ltd.
Date: 07-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.765.644
Abstract: The electrochemical corrosion behaviour of WE54 magnesium alloy in 0.5 wt.% NaCl solution was studied using electrochemical techniques. Polarization results suggested that the rare-earths in WE54 alloy enhanced the passivation tendency of the alloy and decreased the corrosion current by ~30% compared to pure magnesium. Pitting corrosion resistance was also higher in WE54 alloy than that in pure magnesium. Long-term electrochemical impedance results showed that the polarization resistance of WE54 alloy was more than two times higher than that of pure magnesium even after initial passivity breakdown.
Publisher: MDPI AG
Date: 29-11-2017
DOI: 10.3390/MET7120533
Publisher: Trans Tech Publications, Ltd.
Date: 06-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.654-656.2196
Abstract: Successful application of magnesium-based alloys as biodegradable biomaterials is critically dependent on controlling the degradation rate of the alloy. The present study suggests that electrochemical deposition of calcium phosphate on magnesium alloy at an optimal voltage enhances the degradation resistance of the alloy significantly.
Start Date: 05-2021
End Date: 04-2024
Amount: $405,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 02-2017
End Date: 03-2020
Amount: $423,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 04-2020
End Date: 03-2025
Amount: $550,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 01-2012
End Date: 12-2013
Amount: $270,000.00
Funder: Australian Research Council
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