Simultaneous Differential Thermal Analysis and Thermogravimetric Analysis Using the Open-Pan Type of Sample Holder.

McAdie, H. G.

doi:10.1021/ac60205a016

Cited by 24 publications

(9 citation statements)

References 14 publications

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“…The main objective of the paper is to show the usefulness of the IKP method both for determining the kinetic parameters as well as the kinetic model of the investigated process in comparison with conventional kinetic methods. On the other hand, many reported results in determination of kinetic triplet ( A , E a , and f (α)) of the thermal decomposition process of NaHCO 3 in period from 1960 to 1995 20–28 widely deviate from one author to another, which can bring certain confusions in the interpretation of the reaction mechanism of investigated decomposition process. A wide range of calculation techniques has been proposed for deriving the kinetic triplet from thermoanalytical kinetic data.…”

Section: Introductionmentioning

confidence: 96%

The use of the IKP method for evaluating the kinetic parameters and the conversion function of the thermal decomposition of NaHCO₃ from nonisothermal thermogravimetric data

Janković

Adnađević

2007

Int J of Chemical Kinetics

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Three linear isoconversional methods (Friedman, Flynn-Wall-Ozawa, and Kissinger-Akahira-Sunose) and the invariant kinetic parameters (IKP) method were used in order to examine the kinetics of the nonisothermal decomposition of a sodium bicarbonate (NaHCO 3 ). The objective of the paper is to show the usefulness of the IKP method to determine both the kinetic parameters and the kinetic model of the investigated process. The activation energy (E a ) value obtained by the IKP method is in good agreement with the values obtained by isoconversional methods. The IKP method associated with the criterion of coincidence of kinetic parameters for all heating rates led us to the following kinetic triplet: E a = 95.5 kJ mol −1 , A = 2.65 × 10 10 min −1 , and conversion function f (α) = (1 − α) (first-order reaction model, F1).

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Section: Introductionmentioning

confidence: 96%

The use of the IKP method for evaluating the kinetic parameters and the conversion function of the thermal decomposition of NaHCO₃ from nonisothermal thermogravimetric data

Janković

Adnađević

2007

Int J of Chemical Kinetics

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“…Many of these analyses were undertaken many years ago [16][17][18][19][20][21]. The development of technology in thermal analysis has meant that high resolution studies with evolved gas mass spectrometry can now be undertaken to study both synthetic and natural oxalates [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric analysis of wheatleyite Na2Cu2+(C2O4)2·2H2O

Frost

Locke

Martens

2008

J Therm Anal Calorim

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Evidence for the existence of primitive life forms such as lichens and fungi can be based upon the formation of oxalates. These oxalates form as a film like deposit on rocks and other host matrices. The anhydrous oxalate mineral moolooite CuC 2 O 4 as the natural copper (II) oxalate mineral is a classic example. Another example of a natural oxalate is the mineral wheatleyite Na 2 Cu 2+ (C 2 O 4 ) 2 .2H 2 O. High resolution thermogravimetry coupled to evolved gas mass spectrometry shows decomposition of wheatleyite at 255°C. Two higher temperature mass losses are observed at 324 and 349°C. Higher temperature mass losses are observed at 819, 833 and 857°C. These mass losses as confirmed by mass spectrometry are attributed to the decomposition of tennerite CuO. In comparison the thermal decomposition of moolooite takes place at 260 °C. Evolved gas mass spectrometry for moolooite shows the gas lost at this temperature is carbon dioxide. No water evolution was observed, thus indicating the moolooite is the anhydrous copper (II) oxalate as compared to the synthetic compound which is the dihydrate.Keywords: oxalate, wheatleyite, moolooite, copper(II) oxalate, Raman spectroscopy, high resolution thermogravimetry, evolved gas mass spectrometry IntroductionThe presence of oxalates is widespread in nature. These minerals form as the result of expulsion of heavy metals from fungi, lichens and plants [1][2][3]. The production of simple organic acids such as oxalic and citric acids has profound implications for metal speciation in biogeochemical cycles [4]. The metal complexing properties of the acids are essential to the nutrition of fungi and lichens and affects the metal stability and mobility in the environment [4]. Lichens and fungi produce the oxalates of heavy metals as a mechanism for the removal of heavy metals from the plant [5].Thermal analysis has been used for a long time for the analysis of oxalates [6][7][8][9][10][11][12][13][14][15]. Many of these analyses were undertaken many years ago [16][17][18][19][20][21]. The development of technology in thermal analysis has meant that high resolution studies with evolved gas mass spectrometry can now be undertaken to study both synthetic and natural oxalates [22][23][24][25][26][27]. A mineral commonly found in the drier parts of Australia is the mineral moolooite which is the anhydrous copper(II) oxalate. The mineral has been formed through the expulsion of copper from primitive plant forms. These primitive plant forms have been found on host rocks which contain copper. The presence of• Author to whom correspondence should be addressed (r.frost@qut.edu.au) 2 oxalates is widespread in nature, not only in plants but also as naturally occurring minerals. Among these minerals is the sodium copper oxalate mineral wheatlyite [28].The thermal stability of minerals such as the natural oxalates is important to test for life on Mars.. Thermal analysis has been used extensively for testing the stability of minerals [29][30][31][32][33][34][35][36][37][38][39][40][41][42...

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“…During the second step the hemihydrated compound is fully dehydrated (CaSO 4 ). The temperature at which these two reactions take place and the temperature gap between the two reactions, both depend on the partial vapour pressure [40]. In the PHB10.4%HH composites under study, the enthalpy ratio of these two peaks ( H 3 / H 4 ) (table 2) changes as function of filler amount, which indicates a higher value of H 3 in respect to H 4 as the filler amount increases.…”

Section: Thermal Propertiesmentioning

confidence: 95%

Novel poly(hydroxyalkanoates)-based composites containing Bioglass® and calcium sulfate for bone tissue engineering

García-García¹,

Garrido²,

Quijada‐Garrido³

et al. 2012

Biomed. Mater.

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Three different poly(hydroxyalkanoates) (PHAs), copolymers of poly(3-hydroxybutyrate) (P3HB), have been used to make composites using two different fillers, bioactive glass (type 45S5 Bioglass®) and calcium sulfate dihydrate. The PHAs used were poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [PHBHV] and two copolymers of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [PHBHHx]. The aim of the study was the fabrication and characterization of the new composites and the assessment of the influence of the particular filler combination on the physical properties and bioactivity of the films. The thermal behaviour was studied using differential scanning calorimetry while mechanical properties were evaluated using dynamic mechanic thermal analysis and tensile strength test. The mechanical and thermal properties were affected by particles addition. The distribution of the particles in the polymer matrix, observed by scanning electron microscopy, was directly related to the mechanical properties. The surface characteristics were investigated by contact angle measurements and Raman spectroscopy. The extent of formation of hydroxyapatite (HA) upon immersion in simulated body fluid (SBF) depended on the polymer used, the amount of fillers employed and the time of immersion in SBF. Bioactivity was enhanced in the composites with a rise of hydrophilicity. The HA formation was controllable with time in the case of PHBHHx composites.

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Simultaneous Differential Thermal Analysis and Thermogravimetric Analysis Using the Open-Pan Type of Sample Holder.

Cited by 24 publications

References 14 publications

The use of the IKP method for evaluating the kinetic parameters and the conversion function of the thermal decomposition of NaHCO₃ from nonisothermal thermogravimetric data

The use of the IKP method for evaluating the kinetic parameters and the conversion function of the thermal decomposition of NaHCO₃ from nonisothermal thermogravimetric data

Thermogravimetric analysis of wheatleyite Na2Cu2+(C2O4)2·2H2O

Novel poly(hydroxyalkanoates)-based composites containing Bioglass® and calcium sulfate for bone tissue engineering

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Simultaneous Differential Thermal Analysis and Thermogravimetric Analysis Using the Open-Pan Type of Sample Holder.

Cited by 24 publications

References 14 publications

The use of the IKP method for evaluating the kinetic parameters and the conversion function of the thermal decomposition of NaHCO3 from nonisothermal thermogravimetric data

The use of the IKP method for evaluating the kinetic parameters and the conversion function of the thermal decomposition of NaHCO3 from nonisothermal thermogravimetric data

Thermogravimetric analysis of wheatleyite Na2Cu2+(C2O4)2·2H2O

Novel poly(hydroxyalkanoates)-based composites containing Bioglass® and calcium sulfate for bone tissue engineering

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The use of the IKP method for evaluating the kinetic parameters and the conversion function of the thermal decomposition of NaHCO₃ from nonisothermal thermogravimetric data

The use of the IKP method for evaluating the kinetic parameters and the conversion function of the thermal decomposition of NaHCO₃ from nonisothermal thermogravimetric data