Thomas, P, Guerbois, JL & Smallwood, AG 2013, 'Low temperature DSC characterisation of water in opal', Journal of Thermal Analysis and Calorimetry, vol. 113, no. 3, pp. 1255-1260.View/Download from: UTS OPUS or Publisher's site
A low temperature (-60 to +105 A degrees C) DSC characterisation of opal was carried out to determine the proportion of crystallisable water and to estimate the cavity size in which the crystallisable water is contained. Circa 10 % of the molecular water
Angus, KL, Thomas, P & Guerbois, JL 2012, 'Synthesis and characterisation of cobaltite and ferrite spinels using thermogravimetric analysis and X-ray crystallography', Journal of Thermal Analysis and Calorimetry, vol. 108, pp. 449-452.View/Download from: UTS OPUS or Publisher's site
The synthesis for a series of ferrite ((MFe2O4)-Fe-II) and cobaltite ((MCo2O4)-Co-II) spinels was investigated where M-II is Mg, Co, Ni, Cu or Zn. The ferrites were prepared at a calcination temperature of 800 A degrees C; the cobaltites at 500 A degrees
Fukumoto, T, Thomas, PS, Stuart, BH, Simon, P, Adam, G, Shimmon, R & Guerbois, J-P 2012, 'Estimation of the storage life of dimethylol urea using non-isothermal accelerated testing', Journal of Thermal Analysis and Calorimetry, vol. 108, no. 2, pp. 439-443.View/Download from: UTS OPUS or Publisher's site
Thomas, P, Stuart, BH, McGowan, NM, Guerbois, JL, Berkahn, MB & Daniel, V 2011, 'A study of ochres from an Australian aboriginal bark painting using thermal methods', Journal Of Thermal Analysis And Calorimetry, vol. 104, no. 2, pp. 507-513.View/Download from: UTS OPUS or Publisher's site
The potential of thermogravimetric analysis (TG) as a tool for the characterisation of ochre paint used in indigenous Australian bark paintings has been investigated. TG has been combined with differential scanning calorimetry (DSC) and mass spectrometry
Deviese, T, Colombini, M, Regert, M, Stuart, BH & Guerbois, JL 2010, 'TGMS analysis of archaeological bone from burials of the late Roman period', Journal Of Thermal Analysis And Calorimetry, vol. 99, no. 3, pp. 811-813.View/Download from: UTS OPUS or Publisher's site
The use of thermogravimetric analysismass spectrometry (TGMS) to study the state of preservation of archaeological bones has been investigated. As part of a collaborative multi-analytical study, bones exhumed from graves of the late Roman period in France and Italy were examined. A decrease in organic matter for the archaeological bones compared to that for new bone was confirmed, demonstrating that diagenesis of aged bones can be detected using TGMS. Different amounts of collagen were determined for bones from different graves and could, for the majority of specimens, be correlated with the visually observed preservation states.
Vessalas, K, Ray, AS, Thomas, P, Guerbois, JL, Joyce, PA & Haggman, J 2009, 'Pozzolanic reactivity of the supplementary cementitious material pitchstone fines by thermogravimetric analysis', Journal Of Thermal Analysis And Calorimetry, vol. 97, no. 1, pp. 71-76.View/Download from: UTS OPUS or Publisher's site
Thermogravimetric (TG) analysis was applied to the characterisation of the pozzolanic reaction in mortars containing the supplementary cementitious materials (SCMs) pitchstone fines (PF) and fly ash (FA) as partial replacements for Portland cement (PC). TG analysis was used to determine the proportion of calcium hydroxide (CH) present from the hydration of the PC based on the dehydroxylation of the CH present in the blended PC-SCM mortars. The consumption of CH indicated that both SCMs underwent the pozzolanic reaction and that PF was found to compare favourably in its pozzolanic reactivity of FA, the industry and globally accepted standard artificial pozzolan.
Raja, S, Thomas, P, Stuart, BH, Guerbois, JL & O'Brien, C 2009, 'The estimation of pig bone age for forensic application using thermogravimetric analysis', Journal Of Thermal Analysis And Calorimetry, vol. 98, no. 1, pp. 173-176.View/Download from: UTS OPUS or Publisher's site
An accurate means of determining bone age is a goal for forensic scientists. In this study, thermogravimetric analysis (TGA) has been used to examine pig bone specimens of different post-mortem age. Analysis of bone in both air and nitrogen atmospheres reveals a decrease in total mass loss as the bones age. Two mass loss steps due to the decomposition of the organic bone components were observed and show decreasing trends with age for decomposition in an air atmosphere. In a nitrogen atmosphere the decomposition was observed to be more complex and age dependence of the mass loss for each step was not identified. The TGA data, however, demonstrates the potential of the technique as a means of estimating post-mortem age of forensic bone specimens.
Onishi, A, Thomas, P, Stuart, BH, Guerbois, JL & Forbes, SL 2008, 'TG-MS analysis of the thermal decomposition of pig bone for forensic applications', Journal Of Thermal Analysis And Calorimetry, vol. 92, no. 1, pp. 87-90.View/Download from: UTS OPUS or Publisher's site
In order to investigate the potential of thermal analysis for the determination of post-mortem age, rib bone specimens were collected from the remains of a number of slaughtered pigs that were allowed to decompose in the Australian bush in a controlled site under a range of conditions for time periods ranging from 1 to 5 years. The bone specimens were cut in cross-section with the compact bone collected for analysis. TG-MS curves were collected by heating bone samples to 1100°C in an argon atmosphere. The TG-MS data showed significant differences for the pig bone specimens derived from the different environments and showed trends in peak size correlating with age. The reported data suggest that TG-MS has significant potential for the identification of origin as well as the ageing of skeletal remains in a forensic context.
Connan, H, Ray, AS, Thomas, P & Guerbois, JL 2007, 'Effect of autoclaving temperature on calcium silicate-based building products containing clay-brick waste', Journal Of Thermal Analysis And Calorimetry, vol. 88, no. 1, pp. 115-119.View/Download from: UTS OPUS or Publisher's site
The utilisation of fired clay-brick waste is of interest in the manufacture of building products due to both socio-economic and technological reasons. Autoclaving is an established process for manufacturing calcium silicate-based building products that affords rapid strength development. Clay-brick waste represents a source of alternative silica, whcih is more reactive than conventionally used silica and also cntains alumina. This paper presents data on the effect of lowering the autoclaving temperature from commonly practised 180 to 170 degrees C on OPC-quartz blends conatining clay-brick fines as direct replacement of quartz at 4.3, 8.6 and 12.9 mass percentages. The hydration products of autoclaved OPC-quartz blends with clay-brick fines were characterised using simultaneous DTA-TG inc ombination with other methods.
Liu, B, Ray, AS, Thomas, P, Klimesch, DS & Guerbois, JL 2007, 'Mechanical properties of hydrothermally treated alumina-silica rich industrial waste cement system - effect of magnesia addition', Journal of Solid Waste Technology and Management, vol. 33, no. 2, pp. 61-66.View/Download from: UTS OPUS
The utilisation of industrial waste products such as fly ash, blast furnace slag and fired clay-brick, as supplementary cementing materials to produce blended Portland cement (PC) has increased worldwide in recent years. The incentive was directed towards the utilisation of wastes and industrial by-products in order to minimise PC consumption, thus reduce CO2 emissions. This study aims to investigate the potential of magnesia (MgO) as a supplementary material in combination with alumina-silica rich fired clay brick waste fines. Compressive strength results showed adverse effects on the additions of brick waste fines and MgO. However, for blended PC with the addition of both brick waste and magnesia, an apparent synergy, indicating a minimising of strength reduction, was observed. X-ray diffraction (XRD) data revealed the presence of brucite, a hydration product of MgO, in the MgO blended PC suggesting a lack of pozzolanic activity of MgO.
Liu, B, Thomas, P, Ray, AS & Guerbois, JL 2007, 'A TG analysis of the effect of calcination conditions on the properties of reactive magnesia', Journal Of Thermal Analysis And Calorimetry, vol. 88, no. 1, pp. 145-149.View/Download from: UTS OPUS or Publisher's site
The reactivity of MgO obtained from calcination of magnesium carbonate at different temperatures has been investigated by means of hydration in a constant relative humidity environment at 40 degrees C for periods up to 24 days. Natural magnesite and AR g grade basic MgCO3 calcinated in the range of 500-1000 degrees C was characterised in terms of surface area, crystallite size, morphology, and hydration rate. It was foudn that the hydration rate is dependent on the surface area and crystallite size wwhere temperature was the main variable affecting them. The most reactive MgO was produced at the lowest calcination temperature with the highest surface area and the smallest crystallite size. The basic MgO specimens showed higher degree of hydration compared to the natural mgO specimens due to the smaller surface area and larger cyrstallite size. The low MgO content of the starting natural magnesite is also attributable to the lower reactivity. This preliminary study serves as a mean to investigate poetntial utilisation of reactive MgO asa supplementary cementitious material in eco-freindly cements.
Ray, AS, Sri Ravindrarajah, R, Guerbois, JL, Thomas, P, Border, SN, Ray, H, Haggman, J & Joyce, P 2007, 'Evaluation of waste perlite fines in the production of construction materials', Journal Of Thermal Analysis And Calorimetry, vol. 88, no. 1, pp. 279-283.View/Download from: UTS OPUS or Publisher's site
The use of supplementary cementitious materials (SCM) is a well established practice worldwide in the manufacture of Portland cement (PC)-based construction materials. While utilisation of industrial by-products has been successful, the potential of mining wastes is yet yo receive adequate attention in the context of construction materials. In an expanded form perlite, which is a naturally occurring, hydrated volcanic siliceous glass, is an adeal material as a lightweight aggregate for usein a wide range of construction materials including concrete. The mining and processing of the grades of perlite required for the production of lightweight aggregate results inthe cereation of a fine grained waste wjhich currently hasno economic value. This paper reports preliminary data on the utilisation of waste perlite fines as a SCM in calcium silicate-based construction material and discusses the potential of this mining waste to reduce the environmental impact of the production of conventional cement-based consturction materials.
White, RE, Thomas, P, Phillips, M, Wuhrer, R & Guerbois, JL 2007, 'Tg-ms Characterization Of The Reaction Products Of Cadmium Yellow And Malachite Artist's Pigments', Journal Of Thermal Analysis And Calorimetry, vol. 88, no. 1, pp. 181-184.View/Download from: UTS OPUS or Publisher's site
The deleterious interaction of some traditional sulphide artists pigments and copper ions results in the formation of black copper sulphides, in particular, covellite (CuS), and, hence, the discolouration of valuable artworks. In this paper the interacti
Onishi, A, Thomas, P, Stuart, BH, Guerbois, JL & Forbes, SL 2007, 'TG-MS characterisation of pig bone in an inert atmosphere', Journal Of Thermal Analysis And Calorimetry, vol. 88, no. 2, pp. 405-409.View/Download from: UTS OPUS or Publisher's site
A challenge for forensic examiners is the ageing and characterisation of bone fragments or decomposed skeletal remains. Due to the sensitivity of thermal methods to morphological states, thermal analysis has been selected as a technique which could overcome the difficulties. In this preliminary study, TG-MS was applied to the characterisation of bone fragments derived from the compact bone of pig rib specimens. TG-MS curves were collected by heating bone samples to 1000 degrees C in an argon atmosphere. under these conditions, both the organic and inorganic phases decomposed, producing a variety of organic fragments and carbon dioxide. Pyrolysis of the organic phase, which is composed predominantly of collagen, occurred resulting in the observation of ion fragments up to 110 amu. Selected fragments were monited and their observation is discussed in terms of the decomposition of both the collagen phase and the inorganic carbonated hydroxyapatite phase.
Lawry, J, Ray, AS, Klimesch, DS, Thomas, P, Guerbois, JL & Harrison, JW 2005, 'Thermal characterization of Portland cement-magnesia blends', Journal Of Thermal Analysis And Calorimetry, vol. 80, no. 3, pp. 637-641.View/Download from: UTS OPUS or Publisher's site
Due to growing environmental concerns and the need to use less energy-intensive building products, alternatives and improvements to Portland cement (PC) are being actively researched worldwide. Use of supplementary materials is now a common practice wher
Thomas, P, Hirschausen, D, White, RE, Guerbois, JL & Ray, AS 2003, 'Characterisation of the oxidation products of pyrite by thermogravimetric and evolved gas analysis', Journal Of Thermal Analysis And Calorimetry, vol. 72, no. 3, pp. 769-776.View/Download from: UTS OPUS or Publisher's site
Museum specimens of pyrite are known to undergo oxidation even during storage. Characterisation of the oxidation products is however not always simple due to amorphous character and varying degrees of hydration of the oxidation products. This paper presents an alternative approach to the characterisation of oxidation products by identifying their presence from their characteristic thermal decomposition processes using thermogravimetric and evolved gas analysis. Four pyrite specimens were characterised with varying degrees of oxidation. Iron(II) and iron(III) sulphates were also characterised for comparative purposes. The degradation products were observed to correlate well with the presence of iron(II) sulphate even though there was found to be some discrepancy in the higher temperature decomposition reactions.
Klimesch, DS, Guerbois, JL & Ray, AS 2002, 'Differential scanning calorimetry evaluation of autoclaved cement based building materials made with construction and demolition waste', Thermochimica Acta, vol. 389, no. 1-2, pp. 195-198.View/Download from: UTS OPUS or Publisher's site
The effect of adding finely ground construction and demolition (C&D) waste fines, containing a significant amount of clay-brick, to mixtures of Portland cement and quartz sand autoclaved at 180 °C was investigated by DSC. The incorporation of up to 41.25 mass% C&D waste fines enhanced the formation of aluminium-substituted tobermorite indicating that the mullite in the clay-brick fines is reactive under autoclaving conditions and supplied the aluminium required for the formation of this critical phase. C&D waste fine additions in excess of 41.25 mass% promoted the formation of aluminium-substituted CSH1 over aluminium-substituted tobermorite.
Brown, LD, Ray, AS, Thomas, P & Guerbois, JL 2002, 'Thermal Characteristics of Australian Sedimentary Opals', Journal of Thermal Analysis and Calorimetry, vol. 68, no. 1, pp. 31-36.View/Download from: UTS OPUS
Naturally occurring opals from three different regions in Australia were studied for their thermal characteristics. All the opals showed initial expansion followed by contraction in thermomechanical analysis (TMA) although the temperature at which the change from expansion to contraction occurred depended on their provenance. Thermogravimetric analysis (TG) revealed different rates and temperatures of dehydration for these opals. A general correlation between the temperature at which there was a zero thermal expansion and that of the maximum rate of dehydration was observed. A dehydrationsintering mechanism is proposed with the effect of sintering being more pronounced following total dehydration.
Thomas, P, Guerbois, JL, Russell, GF & Briscoe, BJ 2001, 'FTIR Study of the Thermal Degradation of poly(vinyl alcohol)', Journal of Thermal Analysis and Calorimetry, vol. 64, no. 2, pp. 501-508.View/Download from: UTS OPUS or Publisher's site
The degradation of poly(vinyl alcohol) was investigated using TG analysis and Fourier transforminfrared spectroscopy to determine the effect of atmosphere on the process of degradation. Inthe spectra, four vibrational modes were identified that characterised the major steps of thedegradation process. These were the OH, CH, C=O and C=C stretching modes. Themechanism observed for degradation in an inert atmosphere was in accordance with theaccepted mechanism of elimination followed by pyrolisation. Evidence of conjugatedpolyenes, however, was not observed. For the air atmosphere, oxidation in both steps of thedegradation process was observed.
Hu, J, Burns, R & Guerbois, JL 2000, 'The solid-state thermal rearrangement of the Dawson anion (P2Mo18O62)6- into a Keggin type (Pmo12 O40)3- - containing phase and their reactivity in the oxidative dehydrogenation of isobutyraldehyde', Journals of Molecular Catalysis A: Chemical, vol. 152, no. 0, pp. 141-155.
Fukumoto, T, Thomas, P, Stuart, BH, Ray, AS & Guerbois, JL 2012, 'Characterisation of poly(acrylic acid) - montmorillonite composites using TG-MS', 15th International Conference on Thermal Analysis and Calorimetry Abstracts, 15th International Conference on Thermal Analysis and Calorimetry.
Fukumoto, T, Thomas, P, Stuart, BH, Adam, G, Simon, P, Shimmon, R & Guerbois, JL 2011, 'Kinetic and mechanistic analysis of the polymerisation of dimethylol urea', Proceedings of the 3rd Joint Czech-Hungarian-Polish-Slovak Thermoanalytical Conference, Slovak Chemical Society, Stara Lesna, pp. 1-5.
Deviese, T, Colombini, M, Regert, M, Stuart, BH & Guerbois, JL 2009, 'TG-MS analysis of archaeological bone from burials of the late Roman period', Medicta 2009 Book of Abstracts, 9th Mediterranean Conference on Calorimetry and Thermal Analysis, Marseille.
Onishi, A, Thomas, P, Stuart, BH, Guerbois, JL & Forbes, SL 2007, 'TGMS analysis of the thermal decomposition of pig bone for forensic applications', Medicta 2007: The 8th Mediterranean Conference on Calorimetry and Thermal Analysis, 8th Mediterranean Conference on Calorimetry and Thermal Analysis, Palermo.