ORCID Profile
0000-0002-8118-730X
Current Organisation
Curtin University
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Research Topics
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.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Structural properties of condensed matter | Geochemistry | Electrochemistry | Microelectronics and Integrated Circuits | Electrical and Electronic Engineering | Inorganic chemistry | Organic Geochemistry | Isotope Geochemistry | Functional Materials | Compound Semiconductors | Microelectromechanical Systems (MEMS) | Photonic and electro-optical devices sensors and systems (excl. communications) | Electronics sensors and digital hardware | Electronic device and system performance evaluation testing and simulation | Solid state chemistry
ANZSRC Socio-Economic Objective (SEO)
Mineral Exploration not elsewhere classified | Oil and Gas Exploration | Solid Oxide Fuel Cells | Industrial Instruments | Integrated Circuits and Devices | Integrated Systems |
Related Links
Publications
Suppressed Sr segregation and performance of directly assembled La0.6Sr0.4Co0.2Fe0.8O3-δ oxygen electrode on Y2O3-ZrO2 electrolyte of solid oxide electrolysis cells
Publisher: Elsevier BV
Date: 04-2018
Fly ash based geopolymer thin coatings on metal substrates and its thermal evaluation
Publisher: Elsevier BV
Date: 15-08-2010
DOI: 10.1016/J.JHAZMAT.2010.04.121
Abstract: Class F fly ash based Na-geopolymer formulations have been applied as fire resistant coatings on steel. The main variables for the coating formulations were Si: Al molar and water: cement weight ratios. We have determined that the adhesive strength of the coatings strongly depend on geopolymer composition. The ease with which geopolymer can be applied onto metal surfaces and the resultant thickness depend on the water content of the formulation. Adhesive strengths of greater than 3.5 MPa have been achieved on mild steel surfaces for compositions with Si:Al of 3.5. Microstructure evolution and thermal properties of the optimised coating formulations show that they have very promising fire resistant characteristics.
Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys
Publisher: Springer Science and Business Media LLC
Date: 25-06-2019
Acoustic emission and microstructural changes in fly ash geopolymer concretes exposed to simulated fire
Publisher: Springer Science and Business Media LLC
Date: 21-03-2016
Direct application of cobaltite-based perovskite cathodes on the yttria-stabilized zirconia electrolyte for intermediate temperature solid oxide fuel cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA07067A
Abstract: Cobaltite based perovskites can be directly applied on the YSZ electrolyte via an in situ polarization induced electrode/electrolyte interface.
The Optimization of Zircon Analyses by Laser-Assisted Atom Probe Microscopy: Insights from the 91500 Zircon Standard
Publisher: Wiley
Date: 12-2018
Stabilisation of Aragonite: The Role of Mg2+ and Other Impurity Ions
Publisher: American Chemical Society (ACS)
Date: 19-12-2019
DOI: 10.26434/CHEMRXIV.11364857.V1
Abstract: Aragonite formation and stabilisation in seawater is still an area of active investigation since the thermodynamically stable product at room temperature is calcite. In this manuscript, purely inorganic systems that were found to stabilise aragonite were analysed by various techniques. Dynamic Light Scattering was used to characterise the nucleation behaviour of the system and it was found that the presence of magnesium ions during crystal formation inhibits nucleation overall, not just calcite nucleation. In addition, it was found that sulfate is not necessary to stabilise aragonite. Microanalysis by energy dispersive X-ray spectroscopy (EDS) and electron backscatter diffraction (EBSD) revealed that the aragonite that was formed had a disordered core with, sodium, magnesium and sulfate ions incorporated into the structure. To the best of the authors’ knowledge this is the first time an ACC core in aragonite has been visualised in a completely abiotic, synthetic system (in the absence of organic molecules). Inclusion of these impurities into the structure may explain the stability of aragonite in natural seawaters.
Time-resolved, defect-hosted, trace element mobility in deformed Witwatersrand pyrite
Publisher: Elsevier BV
Date: 2018
MICA Platelet-Reinforced Geopolymer Composites
Publisher: Wiley
Date: 30-01-2017
Thermally induced microstructural changes in fly ash geopolymers: Experimental results and proposed model
Publisher: Wiley
Date: 06-12-2015
DOI: 10.1111/JACE.13370
Generation of amorphous carbon and crystallographic texture during low-temperature subseismic slip in calcite fault gouge
Publisher: Geological Society of America
Date: 20-12-2018
DOI: 10.1130/G39584.1
Dolomite: A low cost thermochemical energy storage material
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TA07254J
Abstract: Reversible storage of carbon dioxide in dolomite using a catalyst allows viable thermal energy storage technology.
On the origin of quartz in the Velkerri Fm: implications for exploration and production in the Beetaloo Sub-basin and the Si cycle in the Mesoproterozoic
Publisher: Petroleum Exploration Society of Australia (PESA)
Date: 30-08-2022
DOI: 10.36404/BXBI8225
Abstract: The Beetaloo Sub-basin is a concealed, composite depocenter and a component of a group of intra-cratonic Paleoproterozoic to Mesoproterozoic sedimentary basins collectively described as the Greater McArthur Basin. The Sub-basin hosts unconventional and conventional petroleum resources, particularly in the uppermost Roper Group where stacked play opportunities include liquids rich shale, dry gas shale and hybrid/ tight gas plays (Côté et al. 2018 Altmann et al., 2020).
Analysis of Natural Rutile (TiO2) by Laser-assisted Atom Probe Tomography
Publisher: Oxford University Press (OUP)
Date: 02-2019
DOI: 10.1017/S1431927618015477
Abstract: Since the introduction of laser-assisted atom probe, analysis of nonconductive materials by atom probe tomography (APT) has become more routine. To obtain high-quality data, a number of acquisition variables needs to be optimized for the material of interest, and for the specific question being addressed. Here, the rutile (TiO 2 ) reference material ‘Windmill Hill Quartzite,’ used for secondary ion mass spectrometry U–Pb dating and laser-ablation inductively coupled plasma mass spectrometry, was analyzed by laser-assisted APT to constrain optimal running conditions. Changes in acquisition parameters such as laser energy and detection rate are evaluated in terms of their effect on background noise, ionization state, hit-multiplicity, and thermal tails. Higher laser energy results in the formation of more complex molecular ions and affects the ionization charge state. At lower energies, background noise and hit-multiplicity increase, but thermal tails shorten. There are also correlations between the acquisition voltage and several of these metrics, which remain to be fully understood. The results observed when varying the acquisition parameters will be discussed in detail in the context of utilizing APT analysis of rutile within geology.
Direct Observation of Nanoparticulate Goethite Recrystallization by Atom Probe Analysis of Isotopic Tracers
Publisher: American Chemical Society (ACS)
Date: 28-10-2019
Abstract: Goethite (α-FeOOH) is dispersed throughout the earth's surface, and its propensity to recrystallize in aqueous solutions determines whether this mineral is a source or sink for critical trace elements in the environment. Under reducing conditions, goethite commonly coexists with aqueous Fe(II) (Fe(II)
Rubble pile asteroids are forever
Publisher: Proceedings of the National Academy of Sciences
Date: 23-01-2023
Abstract: Rubble piles asteroids consist of reassembled fragments from shattered monolithic asteroids and are much more abundant than previously thought in the solar system. Although monolithic asteroids that are a kilometer in diameter have been predicted to have a lifespan of few 100 million years, it is currently not known how durable rubble pile asteroids are. Here, we show that rubble pile asteroids can survive ambient solar system bombardment processes for extremely long periods and potentially 10 times longer than their monolith counterparts. We studied three regolith dust particles recovered by the Hayabusa space probe from the rubble pile asteroid 25143 Itokawa using electron backscatter diffraction, time-of-flight secondary ion mass spectrometry, atom probe tomography, and 40 Ar/ 39 Ar dating techniques. Our results show that the particles have only been affected by shock pressure of ca. 5 to 15 GPa. Two particles have 40 Ar/ 39 Ar ages of 4,219 ± 35 and 4,149 ± 41 My and when combined with thermal and diffusion models these results constrain the formation age of the rubble pile structure to ≥4.2 billion years ago. Such a long survival time for an asteroid is attributed to the shock-absorbent nature of rubble pile material and suggests that rubble piles are hard to destroy once they are created. Our results suggest that rubble piles are probably more abundant in the asteroid belt than previously thought and provide constrain to help develop mitigation strategies to prevent asteroid collisions with Earth.
The effect of organic and inorganic fibres on the mechanical and thermal properties of aluminate activated geopolymers
Publisher: Elsevier BV
Date: 07-2015
Highly Stable Sr‐Free Cobaltite‐Based Perovskite Cathodes Directly Assembled on a Barrier‐Layer‐Free Y2O3‐ZrO2 Electrolyte of Solid Oxide Fuel Cells
Publisher: Wiley
Date: 21-02-2017
Abstract: Direct assembly is a newly developed technique in which a cobaltite-based perovskite (CBP) cathode can be directly applied to a barrier-layer-free Y
Applications of advanced analytical and mass spectrometry techniques to the characterisation of micaceous lithium-bearing ores
Publisher: Elsevier BV
Date: 2018
Hot probe measurements on neutron irradiated, isotope enriched ZnO nanorods
Publisher: AIP Publishing
Date: 03-2019
DOI: 10.1063/1.5061722
Abstract: We report on neutron transmutation doping (NTD) of isotopically (64Zn) enriched ZnO nanorods to produce material with holes as the majority mobile carrier. Nanorods of ZnO enriched with 64Zn were synthesised and the abundance of 64Zn in these s les is ∼ 71%, compared to the natural abundance of ∼ 49 %. The enriched material was irradiated with thermal neutrons which converts some 64Zn to 65Zn. The 65Zn decays to 65Cu with a half-life of 244 days and the Cu can act as an acceptor dopant. After 690 days, a hot probe technique was used to determine the majority charge carriers in non-irradiated and neutron irradiated nanorod s les. Non-irradiated s les were measured to be to have electrons as the majority mobile carrier and the irradiated s les were measured to have holes as the majority mobile carrier.
Solar wind contributions to Earth’s oceans
Publisher: Springer Science and Business Media LLC
Date: 29-11-2021
Precambrian reidite discovered in shocked zircon from the Stac Fada impactite, Scotland
Publisher: Geological Society of America
Date: 21-08-2015
DOI: 10.1130/G37066.1
Active, durable bismuth oxide-manganite composite oxygen electrodes: Interface formation induced by cathodic polarization
Publisher: Elsevier BV
Date: 09-2018
The effect of pre-treatment on the thermal performance of fly ash geopolymers
Publisher: Elsevier BV
Date: 12-2013
Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition
Publisher: Elsevier BV
Date: 08-2012
Characterization of various fly ashes for preparation of geopolymers with advanced applications
Publisher: Elsevier BV
Date: 03-2013
Feldspar Pb isotope evidence of cryptic impact-driven hydrothermal alteration in the Paleoproterozoic
Publisher: Elsevier BV
Date: 04-2023
Microstructural and Chemical Investigations of Presolar Silicates from Diverse Stellar Environments
Publisher: American Astronomical Society
Date: 31-01-2022
Abstract: We report the structural and chemical investigation of nine presolar silicate grains from the CH3/CB b 3 chondrite Isheyevo and CR2 chondrite Northwest Africa (NWA) 801. Five of these grains belong to group 1, likely condensed in low- to intermediate-mass asymptotic giant branch (AGB) stars, super-AGB stars, or core-collapse supernovae, while the remaining four grains belong to group 4 and have a supernova origin. The advanced transmission electron microscopy and associated electron spectroscopy analyses show a erse range of chemical and structural compositions for presolar silicates. Two GEMS (glass with embedded metal and sulfide)-like silicates, each from different groups, condensed under nonequilibrium conditions in stellar outflows. Two nonstoichiometric silicates from group 1 have dissimilar formation and alteration histories. An amorphous silicate from group 1 with olivine-like [(Mg,Fe) 2 SiO 4 ] composition likely formed as a crystalline olivine that subsequently amorphized in the interstellar medium. An oldhamite (CaS) grain within a stoichiometric enstatite (MgSiO 3 ) from group 1 probably formed by heterogeneous condensation in circumstellar outflows. Of the two crystalline grains from group 4, one is an antigorite [(Mg,Fe) 3 Si 2 O 5 (OH) 4 ], while the other is a nontronite [Na,Fe 2 (Si,Al) 4 O 10 (OH) 2 .nH 2 O], both formed as a crystalline forsterite and later altered to have hydrated silicate composition. A group-4 silicate has a chemical composition similar to a low Ca-pyroxene [(Ca,Mg)(Si,Al) 2 O 6 ]. Our data imply that presolar grains from different groups can have a similar range of grain-formation conditions.
High temperature behaviour of ambient cured alkali-activated materials based on ladle slag
Publisher: Elsevier BV
Date: 2013
Nanoscale distribution of Pb in monazite revealed by atom probe microscopy
Publisher: Elsevier BV
Date: 02-2018
Corrosion- and damage-resistant nitride coatings for steel
Publisher: Wiley
Date: 05-07-2012
Understanding the Chemical and Structural Properties of Multiple-Cation Mixed Halide Perovskite
Publisher: American Chemical Society (ACS)
Date: 08-10-2019
Defining the Potential of Nanoscale Re-Os Isotope Systematics Using Atom Probe Microscopy
Publisher: Wiley
Date: 07-06-2018
DOI: 10.1111/GGR.12216
Enhancing chalcopyrite leaching by tetrachloroethylene-assisted removal of sulphur passivation and the mechanism of jarosite formation
Publisher: Elsevier BV
Date: 2020
Smart utilization of cobaltite-based double perovskite cathodes on barrier-layer-free zirconia electrolyte of solid oxide fuel cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA08396J
Abstract: Cathode/electrolyte interface could be formed by electrochemical polarization, offering new opportunities for direct application of double perovskites to YSZ-based SOFCs.
Visualization of Diffusion within Nanoarrays
Publisher: American Chemical Society (ACS)
Date: 17-06-2016
DOI: 10.1021/ACS.ANALCHEM.6B00513
Abstract: The direct experimental characterization of diffusion processes at nanoscale remains a challenge that could help elucidate processes in biology, medicine and technology. In this report, two experimental approaches were employed to visualize ion diffusion profiles at the orifices of nanopores (radius (ra) of 86 ± 6 nm) in array format: (1) electrochemically assisted formation of silica deposits based on surfactant ion transfer across nanointerfaces between two immiscible electrolyte solutions (nanoITIES) (2) combined atomic force - scanning electrochemical microscopy (AFM-SECM) imaging of topography and redox species diffusion through the nanopores. The nature of the diffusion zones formed around the pores is directly related to the interpore distance within the array. Nanopore arrays with different ratios of pore center-to-center separation (rc) to pore radius (ra) were fabricated by focused ion beam (FIB) milling of silicon nitride (SiN) membranes, with 100 pores in a hexagonal arrangement. The ion diffusion profiles determined by the two visualization methods indicated the formation of overlapped or independent diffusion profiles at nanopore arrays with rc/ra ratios of 21 ± 2 and 91 ± 7, respectively. In particular, the silica deposition method resulted in formation of a single deposit encompassing the complete array with closer nanopore arrangement, whereas in idual silica deposits were formed around each nanopore within the more widely spaced array. The methods reveal direct experimental evidence of diffusion zones at nanopore arrays and provide practical illustration that the pore-pore separation within such arrays has a significant impact on diffusional transport as the pore size is reduced to the nanoscale. These approaches to nanoscale diffusion zone visualization open up possibilities for better understanding of molecular transport processes within miniaturized systems.
Assessment of a spodumene ore by advanced analytical and mass spectrometry techniques to determine its amenability to processing for the extraction of lithium
Publisher: Elsevier BV
Date: 04-2018
Nanoscale constraints on the shock-induced transformation of zircon to reidite
Publisher: Elsevier BV
Date: 03-2019
Nanoscale features revealed by a multiscale characterisation of discordant monazite highlight mobility mechanisms of Th and Pb
Publisher: Springer Science and Business Media LLC
Date: 29-04-2023
Thermal properties of geopolymers
Publisher: Elsevier
Date: 2009
Organic matter network in post-mature Marcellus Shale
Publisher: American Association of Petroleum Geologists AAPG/Datapages
Date: 11-2018
DOI: 10.1306/04121817180
Performance of fibre reinforced, low density metakaolin geopolymers under simulated fire conditions
Publisher: Elsevier BV
Date: 03-2013
Mechanical properties of fly ash-based geopolymer concretes at high temperature,Mechanische Hochtemperatureigenschaften von flugaschebasierten Geopolymerbetonen
Publisher: Wiley
Date: 08-2016
Positive Effect of Incorporating Er0.4Bi1.6O3 on the Performance and Stability of La2NiO4+δ Cathode
Publisher: The Electrochemical Society
Date: 2019
DOI: 10.1149/2.0841912JES
Three-dimensional quantification of pore structure in coal ash-based geopolymer using conventional electron tomography
Publisher: Elsevier BV
Date: 02-2014
The effects of particle angularity on low-stress three-body abrasion-corrosion of 316L stainless steel
Publisher: Elsevier BV
Date: 10-2016
High performance anode with dendritic porous structure for low temperature solid oxide fuel cells
Publisher: Elsevier BV
Date: 09-2018
Crystallography of refractory metal nuggets in carbonaceous chondrites: A transmission Kikuchi diffraction approach
Publisher: Elsevier BV
Date: 11-2017
The contribution of organic-rich mudstones to the Mesoproterozoic silicon cycle: criticality of microbial life
Publisher: Research Square Platform LLC
Date: 21-09-2023
Mechanisms of deformation-induced trace element migration in zircon resolved by atom probe and correlative microscopy
Publisher: Elsevier BV
Date: 12-2116
In-situ thermo-mechanical testing of fly ash geopolymer concretes made with quartz and expanded clay aggregates
Publisher: Elsevier BV
Date: 02-2016
A comparison between different foaming methods for the synthesis of light weight geopolymers
Publisher: Elsevier BV
Date: 11-2014
Performance of solid and cellular structured fly ash geopolymers exposed to a simulated fire
Publisher: Elsevier BV
Date: 04-2014
Nanogeochronology of discordant zircon measured by atom probe microscopy of Pb-enriched dislocation loops
Publisher: American Association for the Advancement of Science (AAAS)
Date: 02-09-2016
Abstract: Atom probe yields geologically meaningful ages from nanoscale Pb-enriched dislocation loops in discordant zircon.
Aseismic refinement of orogenic gold systems
Publisher: Society of Economic Geologists
Date: 2020
DOI: 10.5382/ECONGEO.4692
Abstract: Orogenic Au deposits have contributed the majority of Au recovered globally throughout history. However, the mechanism that concentrates Au to extremely high bonanza grades in small domains within these deposits remains enigmatic. The volume of fluid required to provide extreme Au endowments in localized occurrences is not reflected in field observations (e.g., in the extent of quartz veining or hydrothermal alteration). Detailed optical, scanning and transmission electron microscopy, nanoscale secondary ion mass spectrometry, and 3-D neutron tomography have been used to investigate the processes responsible for development of anomalously high grade ore (upward of 3% Au) found in quartz veins at Fosterville gold mine (Victoria, Australia). Distinct textural settings of visible Au include (1) Au concentrated along pressure solution seams associated with wall-rock selvages, (2) as nano- to microscale dusty Au seams parallel to pressure solution seams, and (3) in microscale tension fractures perpendicular to stylolitic seams. The distribution of Au in arsenopyrite and pyrite hosted within pressure solution seams changes as a function of the extent of deformation. Sulfides in highly deformed pressure solution seams exclusively host Au as nano- to micrometer-sized clusters within features associated with corrosion and brittle failure, whereas sulfides in mildly deformed pressure solution seams have Au bound in the crystal structure. It is proposed that Au supersaturation in fluids introduced during seismic periods led to the deposition of abundant Au nanoparticles in quartz-carbonate veins. Subsequent pressure dissolution of vein quartz and carbonate during interseismic intervals allowed for episodic increase in the Au/quartz ratio and permitted liberation and migration of Au nanoparticles, promoting Au grain growth in favorable textural settings. Galvanic corrosion and brittle fracturing of auriferous sulfides during the interseismic period allowed additional remobilization and/or enrichment of sulfide-hosted Au. Repetition of this mechanism over the time scale of deposit formation acted to concentrate Au within the lodes. This Au ore upgrading model, referred to as “aseismic refinement,” provides a new insight for the genesis of ultrarich Au mineralization and, based on textures reported from many Au deposits, may be a globally significant component in the formation of orogenic Au deposits.
Nb and Pd co-doped La0.57Sr0.38Co0.19Fe0.665Nb0.095Pd0.05O3-δ as a stable, high performance electrode for barrier-layer-free Y2O3-ZrO2 electrolyte of solid oxide fuel cells
Publisher: Elsevier BV
Date: 02-2018
Other Potential Applications for Alkali-Activated Materials
Publisher: Springer Netherlands
Date: 09-10-2013
Stabilisation of Aragonite: The Role of Mg2+ and Other Impurity Ions
Publisher: American Chemical Society (ACS)
Date: 19-12-2019
DOI: 10.26434/CHEMRXIV.11364857
Abstract: Aragonite formation and stabilisation in seawater is still an area of active investigation since the thermodynamically stable product at room temperature is calcite. In this manuscript, purely inorganic systems that were found to stabilise aragonite were analysed by various techniques. Dynamic Light Scattering was used to characterise the nucleation behaviour of the system and it was found that the presence of magnesium ions during crystal formation inhibits nucleation overall, not just calcite nucleation. In addition, it was found that sulfate is not necessary to stabilise aragonite. Microanalysis by energy dispersive X-ray spectroscopy (EDS) and electron backscatter diffraction (EBSD) revealed that the aragonite that was formed had a disordered core with, sodium, magnesium and sulfate ions incorporated into the structure. To the best of the authors’ knowledge this is the first time an ACC core in aragonite has been visualised in a completely abiotic, synthetic system (in the absence of organic molecules). Inclusion of these impurities into the structure may explain the stability of aragonite in natural seawaters.
Microstructural constraints on the mechanisms of the transformation to reidite in naturally shocked zircon
Publisher: Springer Science and Business Media LLC
Date: 2017
Corrosion behaviour of nanocomposite TiSiN coatings on steel substrates
Publisher: Elsevier BV
Date: 11-2011
Volcanic SiO$_\textrm2$-cristobalite: A natural product of chemical vapor deposition
Publisher: Mineralogical Society of America
Date: 04-2020
DOI: 10.2138/AM-2020-7236
Abstract: Cristobalite is a low-pressure, high-temperature SiO2 polymorph that occurs as a metastable phase in many geologic settings, including as crystals deposited from vapor within the pores of volcanic rocks. Such vapor-phase cristobalite (VPC) has been inferred to result from silica redistribution by acidic volcanic gases but a precise mechanism for its formation has not been established. We address this by investigating the composition and structure of VPC deposited on plagioclase substrates within a rhyolite lava flow, at the micrometer to nanometer scale. The VPC contains impurities of the form [AlO4/Na+]0—coupled substitution of Al3+ charge-balanced by interstitial Na+—which are typical of cristobalite. However, new electron probe microanalysis (EPMA) element maps show in idual crystals to have impurity concentrations that systematically decline from crystal cores-to-rims, and atom probe tomography reveals localized segregation of impurities to dislocations. Impurity concentrations are inversely correlated with degrees of crystallinity [observed by electron backscatter diffraction (EBSD), hyperspectral cathodoluminescence, laser Raman, and transmission electron microscopy (TEM)], such that crystal cores are poorly crystalline and rims are highly ordered tetragonal α-cristobalite. The VPC-plagioclase interfaces show evidence that dissolution-reprecipitation reactions between acidic gases and plagioclase crystals yield precursory amorphous SiO2 coatings that are suitable substrates for initial deposition of impure cristobalite. Successive layers of cubic β-cristobalite are deposited with impurity concentrations that decline as Al-bearing gases rapidly become unstable in the vapor cooling within pores. Final cooling to ambient temperature causes a displacive transformation from β→α cristobalite, but with locally expanded unit cells where impurities are abundant. We interpret this mechanism of VPC deposition to be a natural proxy for dopant-modulated Chemical Vapor Deposition, where halogen-rich acidic gases uptake silica, react with plagioclase surfaces to form suitable substrates and then deposit SiO2 as impure cristobalite. Our results have implications for volcanic hazards, as it has been established that the toxicity of crystalline silica is positively correlated with its purity. Furthermore, we note that VPC commonly goes unreported, but has been observed in silicic lavas of virtually all compositions and eruptive settings. We therefore suggest that despite being metastable at Earth's surface, cristobalite may be the most widely occurring SiO2 polymorph in extrusive volcanic rocks and a useful indicator of gas-solid reaction having occurred in cooling magma bodies.
Direct age constraints on the magnetism of Jack Hills zircon
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-01-2023
Abstract: A potential record of Earth’s magnetic field going back 4.2 billion years (Ga) ago is carried by magnetite inclusions in zircon grains from the Jack Hills. This magnetite may be secondary in nature, however, meaning that the magnetic record is much younger than the zircon crystallization age. Here, we use atom probe tomography to show that Pb-bearing nanoclusters in magnetite-bearing Jack Hills zircons formed during two discrete events at 3.4 and Ga. The older population of clusters contains no detectable Fe, whereas roughly half of the younger population of clusters is Fe bearing. This result shows that the Fe required to form secondary magnetite entered the zircon sometime after 3.4 Ga and that remobilization of Pb and Fe during an annealing event occurred more than 1 Ga after deposition of the Jack Hills sediment at 3 Ga. The ability to date Fe mobility linked to secondary magnetite formation provides new possibilities to improve our knowledge of the Archean geodynamo.
Preparation and thermal properties of fire resistant metakaolin-based geopolymer-type coatings
Publisher: Elsevier BV
Date: 03-2011
Room temperature alkali activation of fly ash: The effect of Na 2 O/SiO 2 ratio
Publisher: Elsevier BV
Date: 10-2014
Developing Atom Probe Tomography of Phyllosilicates in Preparation for Extra‐Terrestrial Sample Return
Publisher: Wiley
Date: 07-05-2021
DOI: 10.1111/GGR.12382
Abstract: Hydrous phyllosilicate minerals, including the serpentine subgroup, are likely to be major constituents of material that will be bought back to Earth by missions to Mars and to primitive asteroids Ryugu and Bennu. Small quantities ( 60 g) of micrometre‐sized, internally heterogeneous material will be available for study, requiring minimally destructive techniques. Many conventional methods are unsuitable for phyllosilicates as they are typically finely crystalline and electron beam‐sensitive resulting in amorphisation and dehydration. New tools will be required for nanoscale characterisation of these precious extra‐terrestrial s les. Here we test the effectiveness of atom probe tomography (APT) for this purpose. Using lizardite from the Ronda peridotite, Spain, as a terrestrial analogue, we outline an effective analytical protocol to extract nanoscale chemical and structural measurements of phyllosilicates. The potential of APT is demonstrated by the unexpected finding that the Ronda lizardite contains SiO‐rich nanophases, consistent with opaline silica that formed as a by‐product of the serpentinisation of olivine. Our new APT approach unlocks previously unobservable nanominerals and nanostructures within phyllosilicates owing to resolution limitations of more established imaging techniques. APT will provide unique insights into the processes and products of water/rock interaction on Earth, Mars and primitive asteroids.
Nanoscale processes of trace element mobility in metamorphosed zircon
Publisher: Springer Science and Business Media LLC
Date: 24-10-2019
Standardizing Spatial Reconstruction Parameters for the Atom Probe Analysis of Common Minerals
Publisher: Oxford University Press (OUP)
Date: 08-2022
DOI: 10.1017/S1431927621013714
Abstract: Well-defined reconstruction parameters are essential to quantify the size, shape, and distribution of nanoscale features in atom probe tomography (APT) datasets. However, the reconstruction parameters of many minerals are difficult to estimate because intrinsic spatial markers, such as crystallographic planes, are not usually present within the datasets themselves. Using transmission and/or scanning electron microscopy imaging of needle-shaped specimens before and after atom probe analysis, we test various approaches to provide best-fit reconstruction parameters for voltage-based APT reconstructions. The results demonstrate that the length measurement of evaporated material, constrained by overlaying pre- and post-analysis images, yields more consistent reconstruction parameters than the measurement of final tip radius. Using this approach, we provide standardized parameters that may be used in APT reconstructions of 11 minerals. The adoption of standardized reconstruction parameters by the geoscience APT community will alleviate potential problems in the measurement of nanoscale features (e.g., clusters and interfaces) caused by the use of inappropriate parameters.
Newborn Screening for Presymptomatic Diagnosis of Complement and Phagocyte Deficiencies
Publisher: Frontiers Media SA
Date: 17-03-2020
Atom probe microscopy of zinc isotopic enrichment in ZnO nanorods
Publisher: AIP Publishing
Date: 02-2017
DOI: 10.1063/1.4976299
Abstract: We report on atomic probe microscopy (APM) of isotopically enriched ZnO nanorods that measures the spatial distribution of zinc isotopes in sections of ZnO nanorods for natural abundance natZnO and 64Zn and 66Zn enriched ZnO nanorods. The results demonstrate that APM can accurately quantify isotopic abundances within these nanoscale structures. Therefore the atom probe microscope is a useful tool for characterizing Zn isotopic heterostructures in ZnO. Isotopic heterostructures have been proposed for controlling thermal conductivity and also, combined with neutron transmutation doping, they could be key to a novel technology for producing p-n junctions in ZnO thin films and nanorods.
Palaeobiology of red and white blood cell-like structures, collagen and cholesterol in an ichthyosaur bone
Publisher: Springer Science and Business Media LLC
Date: 23-10-2017
DOI: 10.1038/S41598-017-13873-4
Abstract: Carbonate concretions are known to contain well-preserved fossils and soft tissues. Recently, biomolecules ( e . g . cholesterol) and molecular fossils (biomarkers) were also discovered in a 380 million-year-old concretion, revealing their importance in exceptional preservation of biosignatures. Here, we used a range of microanalytical techniques, biomarkers and compound specific isotope analyses to report the presence of red and white blood cell-like structures as well as platelet-like structures, collagen and cholesterol in an ichthyosaur bone encapsulated in a carbonate concretion from the Early Jurassic (~182.7 Ma). The red blood cell-like structures are four to five times smaller than those identified in modern organisms. Transmission electron microscopy (TEM) analysis revealed that the red blood cell-like structures are organic in composition. We propose that the small size of the blood cell-like structures results from an evolutionary adaptation to the prolonged low oxygen atmospheric levels prevailing during the 70 Ma when ichthyosaurs thrived. The δ 13 C of the ichthyosaur bone cholesterol indicates that it largely derives from a higher level in the food chain and is consistent with a fish and cephalopod diet. The combined findings above demonstrate that carbonate concretions create isolated environments that promote exceptional preservation of fragile tissues and biomolecules.
Polarization-induced interface and Sr segregation of in situ assembled La0.6 Sr0.4 Co0.2 Fe0.8 O3-δ electrodes on Y2 O3 -ZrO2 electrolyte of solid oxide fuel cells
Publisher: American Chemical Society (ACS)
Date: 11-11-2016
Abstract: Application of cobaltite-based electrodes such as La
Measuring the Anisotropic Dynamic and Static Moduli of the Duvernay Shale
Publisher: European Association of Geoscientists & Engineers
Date: 2019
Thermal character of geopolymers synthesized from class F Fly ash containing high concentrations of iron and α-quartz
Publisher: Wiley
Date: 2010
Effect of Pd doping on the activity and stability of directly assembled La0.95Co0.19Fe0.76Pd0.05O3-δ cathodes of solid oxide fuel cells
Publisher: Elsevier BV
Date: 03-2018
Nebula sulfidation and evidence for migration of free-floating refractory metal nuggets revealed by atom probe microscopy
Publisher: Geological Society of America
Date: 26-07-2017
DOI: 10.1130/G39075.1
Novel Applications of FIB-SEM-Based ToF-SIMS in Atom Probe Tomography Workflows
Publisher: Oxford University Press (OUP)
Date: 09-03-2020
DOI: 10.1017/S1431927620000136
Abstract: Atom probe tomography (APT) is used to quantify atomic-scale elemental and isotopic compositional variations within a very small volume of material (typically .01 µ m 3 ). The small analytical volume ideally contains specific compositional or microstructural targets that can be placed within the context of the previously characterized surface in order to facilitate a correct interpretation of APT data. In this regard, careful targeting and preparation are paramount to ensure that the desired target, which is often smaller than 100 nm, is optimally located within the APT specimen. Needle-shaped specimens required for atom probe analysis are commonly prepared using a focused ion beam scanning electron microscope (FIB-SEM). Here, we utilize FIB-SEM-based time-of-flight secondary ion mass spectrometry (ToF-SIMS) to illustrate a novel approach to targeting nm compositional and isotopic variations that can be used for targeting regions of interest for subsequent lift-out and APT analysis. We present a new method for high-spatial resolution targeting of small features that involves using FIB-SEM-based electron deposition of platinum “buttons” prior to standard lift-out and sharpening procedures for atom probe specimen manufacture. In combination, FIB-ToF-SIMS analysis and application of the “button” method ensure that even the smallest APT targets can be successfully captured in extracted needles.
Low Stress Abrasion-Corrosion of High-Cr White Cast Iron: Combined Effects of Particle Angularity and Chloride Ions
Publisher: The Electrochemical Society
Date: 2019
DOI: 10.1149/2.0511913JES
Atom Probe Tomography: Development and Application to the Geosciences
Publisher: Wiley
Date: 26-02-2020
DOI: 10.1111/GGR.12313
Nanoscale gold clusters in arsenopyrite controlled by growth rate not concentration: Evidence from atom probe microscopy
Publisher: Mineralogical Society of America
Date: 08-2016
A FIB-STEM study of strontium segregation and interface formation of directly assembled La0.6Sr0.4Co0.2Fe0.8O3-δ Cathode on Y2O3-ZrO2 electrolyte of solid oxide fuel cells
Publisher: The Electrochemical Society
Date: 2018
DOI: 10.1149/2.0151807JES
Life on the edge: microbial biomineralization in an arsenic- and lead-rich deep-sea hydrothermal vent
Publisher: Elsevier BV
Date: 02-2020
Assessing the suitability of three Australian fly ashes as an aluminosilicate source for geopolymers in high temperature applications
Publisher: Elsevier BV
Date: 04-2011
Thermal properties of spray-coated geopolymer-type compositions
Publisher: Springer Science and Business Media LLC
Date: 07-07-2012
Preparation of metakaolin based geopolymer coatings on metal substrates as thermal barriers
Publisher: Elsevier BV
Date: 11-2009
Strategies to control the high temperature shrinkage of fly ash based geopolymers
Publisher: Elsevier BV
Date: 03-2014
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