Microwave Differential Thermal Analysis in the Investigation of Thermal Transitions in Materials

Parkes, Gareth M.B.; Barnes, P. A.; Charsley, Edward L.; Bond, G. C.

doi:10.1021/ac990760w

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…Examples include an apparatus to perform thermogravimetric analysis (TGA) which included a novel method for the temperature measurement and control [57], and the so-called microwave differential thermal analysis. The latter works in the same way as conventional DTA, by detecting changes that result from the energetics of the process, but it can also measure differences that result from changes in the microwave heating capacity of the material (changes in dielectric properties) [58][59][60]. At the same time, a similar system was developed with the specific aim of performing thermogravimetric (TG) experiments during the microwave pyrolysis of plastics and plastic/aluminium laminates [26].…”

Section: Thermogravimetric Microwave Pyrolysis Equipmentmentioning

confidence: 99%

Microwave Pyrolysis of Plastic Wastes

Ludlow-Palafox

Chase

2006

Feedstock Recycling and Pyrolysis of Waste Plastics

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Section: Thermogravimetric Microwave Pyrolysis Equipmentmentioning

confidence: 99%

Microwave Pyrolysis of Plastic Wastes

Ludlow-Palafox

Chase

2006

Feedstock Recycling and Pyrolysis of Waste Plastics

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“…Thermal transitions associated with phase changes and decomposition processes in simple chemical systems (i.e. inorganic, organo-metallic and organic compounds) have been investigated [32,33]. The microwave equipment comprised of a variable power source and a rectangular waveguide applicator.…”

Section: Microwave Thermal Analysismentioning

confidence: 99%

Development of a microwave calorimeter for simultaneous thermal analysis, infrared spectroscopy and dielectric measurements

Nesbitt¹,

Navabpour²,

Degamber³

et al. 2004

Meas. Sci. Technol.

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An instrument has been developed for monitoring cure processes under microwave heating conditions. The main function of the instrument was a calorimeter for performing microwave thermal analysis. A single model resonant cavity was used as the heating cell in the microwave calorimeter. Thermal analysis measurements were obtained by monitoring the variation in the microwave power that was required to maintain controlled heating of the sample. The microwave thermal analysis data were analogous to conventional differential scanning calorimetry measurements. The dielectric properties of the sample, as a function of the extent of cure, have been obtained using perturbation theory from the changes in resonant frequency and quality factor of the microwave cavity during heating. Additionally, remote sensing fibre-optic probes have been employed to measure real time in situ infrared spectra of the sample during the cure reaction. In this paper, we describe the design and operation of the microwave calorimeter. Examples of experimental results are also presented.

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“…Almost 20 years ago, a new analytical technique was described for the first time, namely microwave differential thermal analysis (MWDTA), that combined the advantages of microwave heating with the benefits of differential temperature measurement to probe the thermal properties of materials [1]. The limited thermal response using conventional heating is avoided using microwave heating as there is a direct interaction of the material with the microwave energy.…”

Section: Introductionmentioning

confidence: 99%

Predicting the suitability of microwave formulation using microwave differential thermal analysis (MWDTA)

Waters

Ahmad

Parkes

2019

J Therm Anal Calorim

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Microwave-assisted formulation is becoming an established method of formulation in industry, providing a fast, economic and environmentally more favourable way to create products, such as those manufactured in the pharmaceutical industry. However, the effect of microwave-induced heating on a compound, or mixture of compounds, is yet to be fully explored, possibly indicating that this method of formulation may not be suitable in all cases. In this study, the effect of microwave heating was investigated through the application of microwave thermal analysis to six model pharmaceutical compounds and a set of four model excipients. Benzocaine, haloperidol, ibuprofen, indomethacin, ketoprofen and phenylbutazone were analysed, along with four excipients, namely b-cyclodextrin, D-mannitol, stearic acid and Syloid Ò XDP 3050 silica using microwave thermal analysis. Samples were heated by microwave irradiation at 5°C min-1 to a minimum of 160°C, held isothermally and then slowly cooled to room temperature. Thermal profiles were analysed and compared with data obtained using differential scanning calorimetry (DSC) and hot-stage microscopy (HSM). Overall, it was found that the process of microwave heating produced different thermal profiles to those seen using traditional, conductive heating. Investigating differences in thermal profiles can be a useful way to consider the effect of microwave-induced heating on formulations which can, in turn, help guide formulation choices.

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Microwave Differential Thermal Analysis in the Investigation of Thermal Transitions in Materials

Cited by 14 publications

References 16 publications

Microwave Pyrolysis of Plastic Wastes

Microwave Pyrolysis of Plastic Wastes

Development of a microwave calorimeter for simultaneous thermal analysis, infrared spectroscopy and dielectric measurements

Predicting the suitability of microwave formulation using microwave differential thermal analysis (MWDTA)

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