ORCID Profile
0000-0002-6250-7697
Current Organisations
Curtin University
,
Monash University
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Publisher: MDPI AG
Date: 27-07-2021
Abstract: The current overarching global environmental crisis relates to high carbon footprint in cement production, waste plastic accumulation, and growing future energy demands. A simultaneous solution to the above crises was examined in this work. The present study focused on decarbonizing the calcination process of the cement making using waste plastics and biowastes as the reactants or the feedstock, to reduce the carbon footprint and to simultaneously convert it into clean energy, which were never reported before. Other studies reported the use of waste plastics and biowastes as fuel in cement kilns, applicable to the entire cement making process. Calcination of calcium carbonate and magnesium carbonate is the most emission intensive process in cement making in Portland cements and Novacem-like cements. In the Novacem process, which is based on magnesium oxide and magnesium carbonates systems, the carbon dioxide generated is recycled to carbonate magnesium silicates at elevated temperatures and pressures. The present study examined the Novacem-like cement system but in the presence of waste plastics and biomass during the calcination. The carbon dioxide and the methane produced during calcination were converted into syngas or hydrogen in Novacem-like cements. It was established that carbon dioxide and methane emissions were reduced by approximately 99% when plastics and biowastes were added as additives or feedstock during the calcination, which were converted into syngas and/or hydrogen. The reaction intermediates of calcination reactions (calcium carbonate–calcium oxide or magnesium carbonate–magnesium oxide systems) can facilitate the endothermic carbon conversion reactions to syngas or hydrogen acting as non-soot forming catalysts. The conventional catalysts used in carbon conversion reactions are expensive and susceptible to carbon fouling. Two criteria were established in this study: first, to reduce the carbon dioxide/methane emissions during calcination second, to simultaneously convert the carbon dioxide and methane to hydrogen. Reduction and conversion of carbon dioxide and methane emissions were facilitated by co-gasification of plastics and bio-wastes.
Publisher: Wiley
Date: 06-12-2006
DOI: 10.1002/APP.22588
Publisher: Elsevier BV
Date: 04-2006
Publisher: Informa UK Limited
Date: 23-03-2016
Publisher: Elsevier BV
Date: 12-2019
Publisher: Informa UK Limited
Date: 2013
Publisher: Elsevier
Date: 2013
Publisher: Elsevier BV
Date: 1991
Publisher: Informa UK Limited
Date: 09-2007
Publisher: MDPI AG
Date: 21-02-2019
DOI: 10.3390/MA12040655
Abstract: This review focusses on the use of recycled and virgin polymers in mineral and metallurgical processing, both high and ambient temperature processes, including novel applications. End of life applications of polymers as well as the utilisation of polymers during its life time in various applications are explored. The discussion includes applications in cleaner coal production, iron and steel production, iron ore palletisation, iron alloy manufacturing, manganese processing, E-wastes processing and carbon sequestration. The underlying principles of these applications are also explained. Advantages and disadvantages of using these polymers in terms of energy and emission reductions, reduction in non-renewables and dematerialisation are discussed. Influence of the polymers on controlling the evolution of micro and nanostructures in alloys and advanced materials is also considered.
Publisher: Informa UK Limited
Date: 25-09-2015
Publisher: Elsevier BV
Date: 09-2015
Publisher: Wiley
Date: 09-09-2004
DOI: 10.1002/POLB.20250
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 1993
Publisher: Elsevier BV
Date: 06-1989
Publisher: SAGE Publications
Date: 12-2005
Abstract: The mechanical properties of four optically transparent polyimides prepared from the dianhydrides ODPA and 6FDA and the diamines ODA and DAB were assessed. The property changes when these polymers are subjected to high-energy electron-beam irradiation (1 MeV) for doses up to 18.5 MGy and temperatures up to 523 K were also studied and compared. The corresponding changes on radiolysis of Kapton are reported for comparison with the other polymers. The tensile properties of the four polyimides differed mainly by the nature of the dianhydride, with the ODPA polymers undergoing necking and cold drawing and the 6FDA polymers brittle fracture. The four polyimides were synthesized with the objective of obtaining optimum transparency for space applications where high-energy radiation doses of 15-20 MGy may be expected in geosynchronous orbits over a life span of 20 years. The polyimides were shown to maintain good optical and tensile properties at temperatures up to about 450 K for a dose of 18.5 MGy, but above this temperature the moduli of the polymers began to deteriorate and there was a small decrease in the transmittance of the exposed polymer films.
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 03-2007
Publisher: Elsevier BV
Date: 12-2019
Publisher: MDPI AG
Date: 30-09-2015
DOI: 10.3390/MIN5040512
Publisher: Elsevier BV
Date: 07-2001
Publisher: Elsevier BV
Date: 10-2023
Publisher: MDPI AG
Date: 04-09-2023
Publisher: Wiley
Date: 19-01-2006
DOI: 10.1002/APP.22759
Publisher: SAGE Publications
Date: 09-2003
DOI: 10.1177/0954008303015003003
Abstract: The radiation chemical yields G( S) and G( X) for H-linking and Y-linking models for Ultem have been calculated from molecular weight analysis by gel permeation chromatography. These G-values have been compared with the G-values obtained from analysis of soluble fractions above the gel dose, which have been reported in previous works. An analysis of the molecular weight data in terms of H-linking and Y-linking mechanisms yielded values of G( S H ) = 1.0 × 10 −3 and G( H) = 6.0 × 10 −3 and G( S Y ) = 1.3 × 10 −2 and G( Y) = 1.8 × 10 −2 . The corresponding values obtained from the solubility data were G( S H ) = 0.53 × 10 −2 , G( H) = 1.39 × 10 −2 , G( S Y ) = 4.2 × 10 −2 and G( Y) = 4.6 × 10 −2 . The origin of the disagreement between the molecular weight and solubility values is not clear, but it could arise as a result of observed microgel formation below the reported gel dose of 0.13 MGy. Whether the crosslink mechanism proceeds by an H-linking or Y-linking process is also unclear and will require direct observation of the crosslinking structures.
Publisher: EDP Sciences
Date: 2017
Publisher: MDPI AG
Date: 11-01-2022
Abstract: The author wishes to make the following correction to the above paper [...]
Publisher: Elsevier BV
Date: 2014
Publisher: Wiley
Date: 24-05-2006
DOI: 10.1002/APP.23547
Publisher: Trans Tech Publications, Ltd.
Date: 07-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.988.134
Abstract: Superhydrophobicity is directly related to the wettability of the surfaces. Cassie-Baxter state relating to geometrical configuration of solid surfaces is vital to achieving the Superhydrophobicity and to achieve Cassie-Baxter state the following two criteria need to be met: 1) Contact line forces overcome body forces of unsupported droplet weight and 2) The microstructures are tall enough to prevent the liquid that bridges microstructures from touching the base of the microstructures [1]. In this paper we discuss different measurements used to characterise/determine the superhydrophobic surfaces.Keywords: Wettability, contact angle, contact angle hysteresis, contact time, surface roughness, drag reduction measurements, morphology, surface friction, Reynolds number
Publisher: Elsevier BV
Date: 07-2002
Publisher: Elsevier BV
Date: 2004
Publisher: Elsevier BV
Date: 09-2018
Publisher: MDPI AG
Date: 16-05-2022
Abstract: Over 100 million tonnes of waste plastics is projected to enter our environment by 2030 [...]
Publisher: Springer Science and Business Media LLC
Date: 21-07-2017
DOI: 10.1038/S41598-017-03884-6
Abstract: This paper examines the effect of a broad range of crosshead speed (0.05 to 100 mm/min) and a small range of temperature (25 °C and 45 °C) on the failure behaviour of high density polyethylene (HDPE) specimens containing a) standard size blunt notch and b) standard size blunt notch plus small sharp crack – all tested in air. It was observed that the yield stress properties showed linear increase with the natural logarithm of strain rate. The stress intensity factors under blunt notch and sharp crack conditions also increased linearly with natural logarithm of the crosshead speed. The results indicate that in the practical temperature range of 25 °C and 45 °C under normal atmosphere and increasing strain rates, HDPE specimens with both blunt notches and sharp cracks possess superior fracture properties. SEM microstructure studies of fracture surfaces showed craze initiation mechanisms at lower strain rate, whilst at higher strain rates there is evidence of dimple patterns absorbing the strain energy and creating plastic deformation. The stress intensity factor and the yield strength were higher at 25 °C compared to those at 45 °C
Publisher: IOP Publishing
Date: 27-04-2006
No related grants have been discovered for Sheila Devasahayam.