ORCID Profile
0000-0002-1033-8174
Current Organisation
Australian Nuclear Science and Technology Organisation
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Publisher: Springer Science and Business Media LLC
Date: 30-08-2014
Publisher: IOP Publishing
Date: 12-12-2008
Publisher: IEEE
Date: 07-2008
Publisher: Elsevier BV
Date: 10-2017
Publisher: Springer Berlin Heidelberg
Date: 2014
Publisher: The Electrochemical Society
Date: 2014
DOI: 10.1149/2.0191410JSS
Publisher: MDPI AG
Date: 18-12-2019
Abstract: Exposure to particulate matter results in adverse health outcomes, especially in sensitive members of the community. Many communities that co-exist with industry are concerned about the perceived impact of emissions from that industry on their health. Such concerns have resulted in two studies in the Hunter Valley of New South Wales, Australia. The chemical composition of s les of particulate matter, collected over two 12-month s ling periods (2012 and 2014–2015) at six sites in the Hunter Valley and across two size fractions (PM2.5 and PM2.5–10) were input to a receptor model to determine the source of particulate matter influencing particle composition at the sites. Fourteen factors were found to contribute to particle mass. Of these, three source profiles common to all sites, size fractions, and s ling periods were sea salt, industry-aged sea salt and soil. Four source profiles were common across all sites for PM2.5 including secondary sulphate, secondary nitrate, mixed industry/vehicles, and woodsmoke. One source profile (other biomass smoke) was only identified in PM2.5 at Singleton and Muswellbrook, two source profiles (mixed industry/shipping and vehicles) were only identified in PM2.5 at Newcastle, Beresfield, Mayfield, and Stockton, and one source (primary nitrate) was only identified at Stockton in PM2.5. Three sources (bioaerosol, light absorbing particles (coal dust), and industry) were only identified in the PM2.5–10 size fraction at Mayfield and Stockton. The contribution of the soil factor to PM2.5 mass was consistent across the sites, while the fresh sea salt factor decreased with distance from the coast from 23% at Stockton to 3% at Muswellbrook, and smoke increased with distance from the coast. Primary industry was greatest at Stockton (due to the influence of ammonium nitrate emitted from a prilling tower) and lowest inland at Muswellbrook. In general, primary emissions across the sites accounted for 30% of the industry sources. The largest contribution to PM2.5 was from secondary sources at all sites except at Muswellbrook, where woodsmoke and industry sources each made an equal contribution of 40%. In general, secondary reactions accounted for approximately 70% of the industry source, although at Stockton, with the presence of the prilling tower, this split was 50% primary and 50% secondary and at Muswellbrook, the split was 20% primary and 80% secondary. These findings add to the evidence base required to inform policies and programs that will improve air quality in the Hunter Valley.
Publisher: SPIE
Date: 05-10-2012
DOI: 10.1117/12.927749
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM33480A
Publisher: Elsevier BV
Date: 08-2020
Publisher: American Chemical Society (ACS)
Date: 04-09-2012
DOI: 10.1021/JP302724J
Publisher: Springer Science and Business Media LLC
Date: 26-12-2018
Publisher: Springer Science and Business Media LLC
Date: 04-01-2018
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 12-2018
DOI: 10.1016/J.ENVPOL.2018.08.043
Abstract: We discuss 15 years (2000-2015) of daily-integrated PM
Publisher: Wiley
Date: 22-03-2013
DOI: 10.1111/JACE.12244
Publisher: The Electrochemical Society
Date: 27-10-2013
Publisher: American Chemical Society (ACS)
Date: 07-12-2021
Publisher: Elsevier BV
Date: 09-2007
Publisher: Elsevier BV
Date: 03-2005
Publisher: Springer Science and Business Media LLC
Date: 2002
Publisher: Informa UK Limited
Date: 23-09-2014
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 02-2012
Publisher: Informa UK Limited
Date: 02-2007
Publisher: SPIE
Date: 31-08-2006
DOI: 10.1117/12.674547
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2009
Publisher: Wiley
Date: 06-10-2017
DOI: 10.1111/JACE.14490
Publisher: Springer Science and Business Media LLC
Date: 04-01-2019
Publisher: Elsevier
Date: 2018
Publisher: Copernicus GmbH
Date: 13-08-2020
Abstract: Abstract. The effect of observational constraint on the ranges of uncertain physical and chemical process parameters was explored in a global aerosol–climate model. The study uses 1 million variants of the Hadley Centre General Environment Model version 3 (HadGEM3) that s le 26 sources of uncertainty, together with over 9000 monthly aggregated grid-box measurements of aerosol optical depth, PM2.5, particle number concentrations, sulfate and organic mass concentrations. Despite many compensating effects in the model, the procedure constrains the probability distributions of parameters related to secondary organic aerosol, anthropogenic SO2 emissions, residential emissions, sea spray emissions, dry deposition rates of SO2 and aerosols, new particle formation, cloud droplet pH and the diameter of primary combustion particles. Observational constraint rules out nearly 98 % of the model variants. On constraint, the ±1σ (standard deviation) range of global annual mean direct radiative forcing (RFari) is reduced by 33 % to −0.14 to −0.26 W m−2, and the 95 % credible interval (CI) is reduced by 34 % to −0.1 to −0.32 W m−2. For the global annual mean aerosol–cloud radiative forcing, RFaci, the ±1σ range is reduced by 7 % to −1.66 to −2.48 W m−2, and the 95 % CI by 6 % to −1.28 to −2.88 W m−2. The tightness of the constraint is limited by parameter cancellation effects (model equifinality) as well as the large and poorly defined “representativeness error” associated with comparing point measurements with a global model. The constraint could also be narrowed if model structural errors that prevent simultaneous agreement with different measurement types in multiple locations and seasons could be improved. For ex le, constraints using either sulfate or PM2.5 measurements in idually result in RFari±1σ ranges that only just overlap, which shows that emergent constraints based on one measurement type may be overconfident.
Publisher: Scientific Technical Centre TATA, Limited Company
Date: 2017
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 02-2012
Publisher: SPIE
Date: 26-12-2008
DOI: 10.1117/12.810716
Publisher: Wiley
Date: 26-05-2017
DOI: 10.1111/JACE.14959
Publisher: Environmental Health Perspectives
Date: 02-2018
Publisher: American Chemical Society (ACS)
Date: 28-08-2015
Abstract: Photocatalytic activity of oxide semiconductors is commonly considered in terms of the effect of the band gap on the light-induced performance. The present work considers a combined effect of several key performance-related properties (KPPs) on photocatalytic activity of TiO2 (rutile), including the chemical potential of electrons (Fermi level), the concentration of surface active sites, and charge transport, in addition to the band gap. The KPPs have been modified using defect engineering. This approach led to imposition of different defect disorders and the associated KPPs, which are defect-related. This work shows, for the first time, a competitive influence of different KPPs on photocatalytic activity that was tested using oxidation of methylene blue (MB). It is shown that the increase of oxygen activity in the TiO2 lattice from 10(-12) Pa to 10(5) Pa results in (i) increase in the band gap from 2.42 to 2.91 eV (direct transitions) or 2.88 to 3 eV (indirect transitions), (ii) increase in the population of surface active sites, (iii) decrease of the Fermi level, and (iv) decrease of the charge transport. It is shown that the observed changes in the photocatalytic activity are determined by two dominant KPPs: the concentration of active surface sites and the Fermi level, while the band gap and charge transport have a minor effect on the photocatalytic performance. The effect of the defect-related properties on photoreactivity of TiO2 with water is considered in terms of a theoretical model offering molecular-level insight into the process.
Publisher: The Electrochemical Society
Date: 05-2023
Abstract: As an alternative to H 2 O 2 enzymatic biosensing devices, non-enzymatic CeO 2 -based biosensors have shown improved sensibility, robustness, and shelf lives. The redox capability in CeO 2 and rapid switching between its oxidation states facilitate the formation of structural vacancy defects that serve as active sites. This work reports a novel approach for synthesis of defect-rich CeO 2-x -based nanoflakes using a controllable electrochemical-based deposition at low temperatures (45°−65 °C) followed by low-energy ion implantation. Among the nanoflakes, Mo-implanted CeO 2-x exhibited outstanding sensitivity of 4.96 × 10 −5 A·mM −1 cm −2 within the linear range of 0.05–10 mM. Moreover, the ion-implanted s les yielded high sensing stability and electronic conductivity. The former was achieved through the multi-valence charge transfer between Ce and the implanted ions that caused the reduction of Gibbs free energies required for the formation/retention of the defects. The latter was due to the narrowing of the electronic bandgap of CeO 2-x by creation of defect-induced midgap states.
Publisher: Springer Science and Business Media LLC
Date: 30-12-2015
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 12-2012
Publisher: American Chemical Society (ACS)
Date: 21-11-2012
DOI: 10.1021/AM301729Z
Abstract: This work reports the effect of indium segregation on the surface versus bulk composition of indium (In)-doped TiO(2). The studies are performed using proton-induced X-ray emission (PIXE), secondary-ion mass spectrometry (SIMS), X-ray photoelectron spectroscopy (XPS), and Rutherford backscattering spectroscopy (RBS). The results of XPS analysis indicate that annealing of In-doped TiO(2) containing 0.3 atom % In at 1273 K in the gas phase of controlled oxygen activity [p(O(2)) = 75 kPa and 10 Pa] results in a surface enrichment of 2.95 and 2.61 atom % In, respectively. The obtained segregation data are considered in terms of the transport of indium ions from its titanium sites in the bulk phase to the surface where these ions are incorporated into interstitial sites. The effect of oxygen activity on the segregation-induced surface enrichment is considered in terms of the formation of a low-dimensional surface structure and a sublayer, which are charged negatively. The latter is formed as a result of strong interactions between titanium vacancies and interstitial indium ions, leading to the formation of defect complexes. The data obtained in this work may be used for engineering of TiO(2)-based semiconductors with enhanced performance in solar energy conversion.
Publisher: Springer Science and Business Media LLC
Date: 06-01-2018
Publisher: Wiley
Date: 15-02-2016
DOI: 10.1111/JACE.14122
Publisher: Elsevier BV
Date: 12-2017
DOI: 10.1016/J.ENVPOL.2017.08.021
Abstract: The Pacific Islands carry a perception of having clean air, yet emissions from transport and burning activities are of concern in regard to air quality and health. Ultrafine particle number concentrations (PNCs), one of the best metrics to demonstrate combustion emissions, have not been measured either in Suva or elsewhere in the Islands. This work provides insight into PNC variation across Suva and its relationship with particle mass (PM) concentration and composition. Measurements over a short monitoring c aign provide a vignette of conditions in Suva. Ambient PNCs were monitored for 8 day at a fixed location, and mobile PNC s ling for two days. These were compared with PM concentration (TSP, PM
Publisher: AIP Publishing
Date: 07-09-2009
DOI: 10.1063/1.3224189
Abstract: The concentration dependence of H diffusion in amorphous Si (a-Si) formed by ion implantation is reported for implanted H profiles. An empirical relationship is proposed which relates the diffusion coefficient to the H concentration valid up to 0.3 at. %. B-enhanced H diffusion is observed and shows trends with temperature typically associated with a Fermi level shifting dependence. A modified form of the generalized Fermi level shifting model is applied to these data.
Publisher: Springer Science and Business Media LLC
Date: 07-11-2018
Publisher: Elsevier BV
Date: 11-2002
Publisher: IEEE
Date: 12-2006
Publisher: American Chemical Society (ACS)
Date: 19-05-2014
DOI: 10.1021/JP4110536
Publisher: Copernicus GmbH
Date: 21-11-2019
DOI: 10.5194/ACP-2019-834
Abstract: Abstract. The effect of observational constraint on the ranges of uncertain physical and chemical process parameters was explored in a global aerosol–climate model. The study uses 1 million variants of the HadGEM3-UKCA climate model that s le 26 sources of uncertainty, together with over 9000 monthly aggregated grid-box measurements of aerosol optical depth, PM2.5, particle number concentrations, sulphate and organic mass concentrations. Despite many compensating effects in the model, the procedure constrains the probability distributions of parameters related to secondary organic aerosol, anthropogenic SO2 emissions, residential emissions, sea spray emissions, dry deposition rates of SO2 and aerosols, new particle formation, cloud droplet pH and the diameter of primary combustion particles. Observational constraint rules out nearly 98 % of the model variants. On constraint, the ± 1σ (standard deviation) range of global annual mean direct radiative forcing, RFari, is reduced by 33 % to −0.14 to −0.26 W m−2, and the 95 % credible interval (CI) is reduced by 34 % to −0.1 to −0.32 W m−2. For the global annual mean aerosol–cloud radiative forcing, RFaci, the ± 1σ range is reduced by 7 % to −1.66 to −2.48 W m−2, and the 95 % CI by 6 % to −1.28 to −2.88 W m−2. The tightness of the constraint is limited by parameter cancellation effects (model equifinality) as well as the large and poorly defined representativeness error associated with comparing point measurements with a global model. The constraint could also be narrowed if model structural errors that prevent simultaneous agreement with different measurement types in multiple locations and seasons could be improved. For ex le, constraints using either sulphate or PM2.5 measurements in idually result in RFari ± 1σ ranges that only just overlap, which shows that emergent constraints based on one measurement type may be over-confident.
Publisher: Elsevier BV
Date: 07-2018
DOI: 10.1016/J.SCITOTENV.2018.02.231
Abstract: Characterisation of atmospheric aerosols is of major importance for: climate, the hydrological cycle, human health and policymaking, biogeochemical and palaeo-climatological studies. In this study, the chemical composition and source apportionment of PM
Publisher: Elsevier BV
Date: 04-2021
Publisher: American Chemical Society (ACS)
Date: 23-06-2007
DOI: 10.1021/JP0678709
Abstract: The present work reports the tracer diffusion coefficient for (93)Nb in rutile TiO(2) single crystals using secondary ion mass spectrometry (SIMS). The determined tracer diffusion coefficient exhibited the following temperature dependence in air ( p(O2) = 21 kPa) over the range 1073-1573 K: D93(Nb) = (4.7 m2 s(-1))x10(-7+/-0.4) exp ((-244 +/- 9 kJ mol-1)/RT) Through comparison to the self-diffusion of (44)Ti in rutile TiO(2), (93)Nb is interpreted to diffuse via the interstitialcy mechanism. The obtained tracer diffusion data are useful for ensuring compositional control during the processing of Nb-doped TiO(2)-based semiconductors using solid-state reactions between Nb(2)O(5) and TiO(2).
Publisher: Elsevier BV
Date: 05-2020
Publisher: Trans Tech Publications, Ltd.
Date: 23-05-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.783-786.1674
Abstract: Rutile is a good candidate for total water oxidation and hydrogen production due mainly to its corrosion resistance in water. In its native form, the direct band gap of 3.02eV, with the absorption edge in the visible part of the solar spectrum at 416nm, but close to the UV region, results in poor photo-catalytic efficiency of around 3%, well below the commercial threshold of around 10%. One option to enhance the photo-catalytic efficiency is band gap engineering, through the reduction of the Fermi level, which may be achieve by either changing the oxygen activity, or the incorporation of aliovalent foreign ions. The incorporation of donor and acceptor-type of ions may lead to a shift in the Fermi level close to the conduction or valence bands. Single crystals of TiO 2 -Rutile (SG: P4 2/mnm), with (001) orientation were implanted along at 10keV and 2MeV, where the range of C in TiO 2 is 21nm and 1.6μm, respectively. The ion implantation was carried out at various equivalent C concentrations, and characterised in-situ by ERDA with 82MeV Iodine, and PIXE with 2.5MeV protons. Optic band gap was assessed by ground state band structure calculations based on CASTEP code, with geometry optimisation by general gradient approximation and PBE functional, and energy optimisation by local density approximation and CA-PZ functional.
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 03-2009
Publisher: Elsevier BV
Date: 05-2012
Publisher: Springer Science and Business Media LLC
Date: 06-11-2008
Publisher: Springer Science and Business Media LLC
Date: 2008
Publisher: Springer Science and Business Media LLC
Date: 26-12-2018
Publisher: Elsevier BV
Date: 2018
DOI: 10.1016/J.SCITOTENV.2017.08.225
Abstract: Health implications of air pollution vary dependent upon pollutant sources. This work determines the value, in terms of reduced mortality, of reducing ambient particulate matter (PM
Publisher: CSIRO Publishing
Date: 2014
DOI: 10.1071/EN14090
Abstract: Environmental context Long-term exposure to fine particle air pollution has significant implications for human health. At a mixed urban–industrial site in Newcastle, Australia, we identified contributions from in idual industrial aerosol sources in addition to the more common aerosol sources such as soil, sea and smoke. These results are significant for the assessment and management of fine particulate air pollution in the Newcastle air shed. Abstract A long-term, large dataset approach combining standard accelerator-based ion beam analysis (IBA) techniques with positive matrix factorisation (PMF) analysis to determine the sources and trends of fine particle pollution in the Newcastle NSW, Australia is discussed. Over 1500 s les of particle matter with aerodynamic diameter less than 2.5µm (PM2.5) were collected between February 1998 and December 2013 and analysed using IBA techniques to obtain the concentration of 22 different elements from hydrogen to lead. The PM2.5 15-year average mass at the s ling site was 8.11µgm–3. Statistical PMF analysis was applied to this large dataset to quantitatively determine nine source fingerprints soil, secondary sulfate, sea, smoke, industrial processes (specifically related to calcium, manganese and iron) and two different automobile sources. Significant step-like reductions of 98, 79 and 69%, over and above regular seasonal variations, were clearly observed in the industrial-Mn, industrial-Fe and automobile sources during this time period. These trends showed excellent correlation with the cessation of large industrial operations in the local area and clearly demonstrate the advantage of long-term aerosol analysis for monitoring and managing fine particle air pollution sources on a local scale.
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B610188G
Publisher: American Chemical Society (ACS)
Date: 20-05-2008
DOI: 10.1021/CM703509F
Publisher: Elsevier BV
Date: 02-2017
Publisher: MDPI AG
Date: 11-07-2023
Abstract: As the demand for seafood increases, so does the incidence of seafood fraud. Confirming provenance of seafood is important to combat fraudulent labelling but requires a database that contains the isotopic and elemental “fingerprints” of authentic seafood s les. Local isotopic and elemental databases can be scaled up or combined with other databases to increase the spatial and species coverage to create a larger database. This study showcases the use of isotopic and elemental fingerprints of the black tiger prawn (Penaeus monodon) to develop a database that can be used to securely store the data necessary for determining provenance. The utility of this database was tested through querying and building seven different datasets that were used to develop models to determine the provenance of P. monodon. The models built using the data retrieved from the database demonstrated that the provenance of P. monodon could be determined with % accuracy. As the database was developed using MySQL, it can be scaled up to include additional regions, species, or methodologies depending on the needs of the users. Combining the database with methods of determining provenance will provide regulatory bodies and the seafood industry with another provenance tool to combat fraudulent seafood labelling.
Publisher: AIP Publishing
Date: 2022
DOI: 10.1063/5.0110115
Publisher: Springer Science and Business Media LLC
Date: 10-06-2017
Publisher: Elsevier BV
Date: 11-2018
Location: Australia
No related grants have been discovered for Armand Atanacio.