ORCID Profile
0000-0002-7305-2931
Current Organisation
Quantum Brilliance
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Nuclear physics | Nuclear and plasma physics | Law and society and socio-legal research | Mineral processing/beneficiation |
Publisher: Elsevier BV
Date: 03-2021
DOI: 10.1016/J.MSEC.2021.111935
Abstract: Airway respiratory epithelium forms a physical barrier through intercellular tight junctions, which prevents debris from passing through to the internal environment while ciliated epithelial cells expel particulate-trapping mucus up the airway. Polymeric solutions to loss of airway structure and integrity have been unable to fully restore functional epithelium. We hypothesised that plasma treatment of polymers would permit adsorption of α-helical peptides and that this would promote functional differentiation of airway epithelial cells. Five candidate plasma compositions are compared Air, N
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 11-2010
Publisher: Elsevier BV
Date: 03-2022
Publisher: Informa UK Limited
Date: 06-2010
Publisher: Elsevier BV
Date: 12-2022
Publisher: American Chemical Society (ACS)
Date: 11-2021
DOI: 10.1021/ACSBIOMATERIALS.1C00763
Abstract: A series of quaternary Zn-Al-Cu-Li alloys with different weight fractions of Cu, Al, and Li were developed and investigated for potential application in high load bearing bioresorbable implants. The developed alloys provided various fractions of binary and ternary intermetallic structures, which resulted in formation of multiphase microstructures containing a zinc-rich η-phase and LiZn
Publisher: Elsevier BV
Date: 06-2013
Publisher: Elsevier BV
Date: 2013
Publisher: De Gruyter
Date: 20-04-2020
Publisher: Springer Science and Business Media LLC
Date: 25-10-2011
Publisher: Elsevier BV
Date: 2017
Publisher: SAGE Publications
Date: 20-12-2016
Abstract: Carbon fibres are leading reinforcements in composite materials because of their outstanding mechanical and physical properties. However, the graphitic surface of these fibres is relatively inert, and the weak interaction between the carbon fibres and the polymeric matrix has negative consequences for the mechanical properties of composite materials. Surface treatments have been used to increase the surface roughness, remove contaminants or weakly bonded layers, and to alter the surface chemistry and wettability of the fibres. In this article, the authors review the effect of the microstructure on the response of the carbon fibres to the surface treatments. The observations from conventional carbon fibres and functionalisation techniques are extrapolated to plasma surface treatments and to novel carbon fibres produced from bio-precursors.
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 03-2021
Publisher: American Vacuum Society
Date: 24-01-2017
DOI: 10.1116/1.4974913
Abstract: The active screen plasma technology was used to functionalize carbon fibers and vitreous carbon disks. The plasma treatment conditions were mapped using optical emission spectroscopy and the functionalized surfaces were analyzed using scanning electron microscopy and atomic force microscopy, x-ray photoelectron spectroscopy, and contact angle measurements. A relationship was found between the active species in the plasma and the functional groups attached to the carbon surfaces, which provides valuable information for the optimization of the active screen plasma treatment. Moreover, the surface analyses were repeated over a period of 28 days to study the aging of the functionalized surfaces in air. The hydrophobic recovery was modeled using a surface restructuring theory which revealed a mean lifetime of 3.4 days for the functional groups.
Publisher: Elsevier BV
Date: 07-2010
Publisher: Elsevier BV
Date: 07-2012
Publisher: Elsevier BV
Date: 09-2009
Publisher: Elsevier BV
Date: 09-2018
Publisher: Springer Science and Business Media LLC
Date: 17-12-2013
Publisher: Elsevier BV
Date: 11-2019
Publisher: Laser Institute of America
Date: 15-06-2020
DOI: 10.2351/7.0000116
Abstract: Fe-Cr-C near-eutectic alloys are commonly used in wear resistant parts in mining applications, due to their excellent erosion and abrasion wear resistance. Laser metal deposition is an additive technology that presents opportunities for manufacturing mining components, as well as repairing worn areas of wear resistant parts. However, Fe-Cr-C hypoeutectic alloys are very hard and brittle and are often considered “unweldable” due to the lack of ductility required to accommodate thermal stresses. Therefore, controlling key processing parameters, such as preheating temperature and cooling rate, plays a crucial role in achieving crack-free layers with a refined microstructure. The aim of this study was to investigate the effect of substrate preheat temperature on the microstructure and wear properties of laser metal deposited Fe-28Cr-2.9C alloy. The microstructure and wear properties were analyzed for three different preheating conditions. The microstructure consisted of a near-eutectic structure consisting of M7C3 carbides + austenite, which has been mostly transformed to martensite. Increasing the preheating temperature increased the carbide size and retained austenite in the matrix, which was detrimental for the wear resistance.
Publisher: Springer Science and Business Media LLC
Date: 21-04-2023
DOI: 10.1007/S10853-023-08461-Z
Abstract: (Cr,Fe) 7 C 3 ternary carbides constitute the majority of eutectic carbides in abrasion-resistant white cast irons. Density functional theory models have predicted these carbides to have a combination of metallic, covalent and ionic bonding, in proportions depending on the carbide’s Cr:Fe ratio. However, experimental research to validate these predictions has been lacking. This study investigates the characteristics of the carbides as a function of Cr:Fe ratio, which was manipulated from Fe-rich to Cr-rich by varying the Cr:C ratio of the bulk alloy. The carbides’ crystalline structure, hardness, Young’s modulus, fracture toughness and abrasion performance have been assessed through techniques including nano-indentation, HR-TEM and the inner circumference abrasion test (ICAT). Fe-rich M 3 C formed at very low bulk Cr:C ratio was found to have an orthorhombic crystal structure. In all other alloys, with Cr:C ratios above 2.7, M 7 C 3 was formed and found to have a hexagonal structure. Hardness, Young’s modulus and calculated fracture toughness of M 7 C 3 all increase with Cr:Fe ratio, from (Fe 5 ,Cr 2 )C 3 up to a maximum for (Cr 4 ,Fe 3 )C 3 (in 18Cr–6.8Cr:C WCI). This gave the highest hardness (22.9 GPa) and Young’s modulus (315 GPa), but also the highest fracture toughness (4.5 MPa.m0.5). The peak fracture toughness at carbide composition of (Cr 4 ,Fe 3 )C 3 in this study is consistent with the prediction of DFT models in the literature while the peak hardness at the same carbide composition shows a marginal deviation from the predictions. Abrasion performance generally increased with carbide hardness and fracture toughness, with one exception: (Cr 4.3 ,Fe 2.7 )C 3 . Although (Cr 4.3 ,Fe 2.7 )C 3 showed marginally lower inherent fracture toughness than (Cr 4.0 ,Fe 3.0 )C 3 , the higher Cr:Fe carbides imparted the highest abrasion performance, associated with modified eutectic morphology.
Publisher: Elsevier BV
Date: 09-2009
Publisher: Informa UK Limited
Date: 02-2011
Publisher: Springer Science and Business Media LLC
Date: 17-10-2022
DOI: 10.1007/S10853-022-07793-6
Abstract: With the increasing use of CubeSats in space exploration, the demand for reliable high-temperature shape memory alloys (HTSMA) continues to grow. A wide range of HTSMAs has been investigated over the past decade but finding suitable alloys by means of trial-and-error experiments is cumbersome and time-consuming. The present work uses a data-driven approach to identify NiTiHf alloys suitable for actuator applications in space. Seven machine learning (ML) models were evaluated, and the best fit model was selected to identify new alloy compositions with targeted transformation temperature (Ms), thermal hysteresis, and work output. Of the studied models, the K-nearest neighbouring ML model offers more reliable and accurate prediction in developing NiTiHf alloys with balanced functional properties and aids our existing understanding on compositional dependence of transformation temperature, thermal hysteresis and work output. For instance, the transformation temperature of NiTiHf alloys is more sensitive to Ni variation with increasing Hf content. A maximum Ms reduction rate of 6.12 °C per 0.01 at.% Ni is attained at 30 at.% Hf, and with a Ni content between 50 and 51 at.%. Graphical abstract
Publisher: Springer Science and Business Media LLC
Date: 06-02-2023
DOI: 10.1007/S11661-023-06976-3
Abstract: Precipitation hardening is a promising approach for strengthening of Hadfield steels. The present study examines the potential to achieve this by combining vanadium addition (up to 2 wt pct) with short-time aging (15 minutes) at 1173 K (900 °C). It was found that such a treatment is sufficient to generate a dispersion of nanoscale precipitates that provided a significant increase in hardness. Small-angle neutron scattering and transmission electron microscopy measurements were performed to quantify the particle dispersion, and Orowan precipitate hardening predictions made using the parameters thus obtained show good correspondence with the observed rates of age hardening, suggesting the precipitates are resistant to shearing. The present steels containing vanadium showed a small reduction in work-hardening capacity and this is believed to be due to carbon depletion from the matrix. It is concluded that the addition of vanadium and a short aging treatment at 1173 K (900 °C) provide a promising pathway to imparting hardness increases that provide gouge resistance during the running-in period of components made from Hadfield steel. For optimum performance, additional carbon should be added to maintain the solute carbon content of the matrix, and hence the matrix work-hardening rate.
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 10-2011
Publisher: American Chemical Society (ACS)
Date: 28-06-2017
Abstract: Supercapacitors are energy storage devices with higher energy densities than conventional capacitors but lower than batteries or fuel cells. There is a strong interest in increasing the volumetric and gravimetric capacitance of these devices to meet the growing demands of the electrical and electronic sectors. The capacitance depends largely on the electrode material, and carbon nanofibers (CNFs) have attracted much attention because of their relatively low cost, large surface area, and good electrical conductivity as well as chemical and thermal stability. The deposition of metal nanoparticles on CNFs is a promising way to increase their surface properties and, ultimately, the capacitance of the devices. In this study, nickel and silver nanoparticles were deposited on CNFs using the active screen plasma technology. The CNFs were characterized, and their electrochemical performance was assessed in a three-electrode cell. The results show significant improvements over the untreated CNFs, particularly after functionalization with silver nanoparticles.
Location: Australia
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2023
End Date: 12-2027
Amount: $4,999,600.00
Funder: Australian Research Council
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