A New Instrument for Simultaneous DTA — Mass Spectrometric Analysis

Aspinal, M.L.; Madoc-Jones, H. J.; Charsley, Edward L.; Redfern, J. P.

doi:10.1007/978-3-0348-7413-7_26

Cited by 3 publications

(3 citation statements)

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“…Its thermal decomposition has also been of interest as a potential source of pure magnesium oxide [27]. Simultaneous DTA-mass spectrometry studies indicated that it was not possible to dehydrate the hexahydrate without some decomposition of the nitrate taking place a temperatures as low as 130 °C [28]. Thermomicroscopy experiments indicated that the spikey nature of the DTA and evolved gas profiles was due to the vigorous evolution of the gaseous products from the aqueous melt [29].…”

Section: Thermal Degradation Of Magnesium Nitrate Hexahydratementioning

confidence: 99%

Applications of a simultaneous differential scanning calorimetry–thermomicroscopy system

Ashton

Charsley

Harding

et al. 2021

J Therm Anal Calorim

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A simultaneous DSC–thermomicroscopy system (DSC450 Linkam Scientific) was applied to the study of phase transitions in rubidium nitrate and silver iodide, the oxidation of polyethylene, the thermal degradation of polylactic acid and magnesium nitrate hexahydrate, and the reversible transitions in thermochromic inks. The results demonstrated the benefits of obtaining simultaneous optical data, both images and light intensity measurements, with DSC, particularly in the interpretation of complex processes and the detection of events with small changes in enthalpy.

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Section: Thermal Degradation Of Magnesium Nitrate Hexahydratementioning

confidence: 99%

Applications of a simultaneous differential scanning calorimetry–thermomicroscopy system

Ashton

Charsley

Harding

et al. 2021

J Therm Anal Calorim

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“…A maximum sensitivity of 3 #g/min/mm is available, enabling small samples to be studied at slow heating rates. A typical application of the DTG unit is illustrated by the thermal decomposition of magnesium nitrate hexahydrate, which has already been found, by simultaneous DTA-mass spectrometric analysis, to be a complex process [2]. Fig.…”

Section: Derivative Thermogravimetrymentioning

confidence: 99%

A new high sensitivity thermobalance

Charsley

Kamp

1975

Journal of Thermal Analysis

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A new thermobalance is described which gives a direct plot of percentage weight loss versus sample temperature, without the need for replotting the results. The unit operates over the range ambient to 1000~ and features a miniature water-cooled furnace in conjunction with an electronic microbalance, giving sensitivities of 1 --250 mg for full scale deflection on a potentiometric recerder. Heating rates of 1--100~ are available and the furnace will cool from 1000~ to 50~C in less than four minutes. Typical applications of the unit are illustrated by reference to a number of inorganic and polymer systems.Although recent years have seen considerable development in the field of differential thermal analysis instrumentation, thermobalance design has not proceeded to such a high level of sophistication. Thus samples of the order of 50-200 mg are still widely used, requiring slow heating rates to obtain good resolution. This, coupled with the slow cooling rate of conventional furnaces, makes thermogravimerry a fairly lengthy process.In addition, the so-called "buoyancy effect" which causes an apparent increase in sample weight [l], requires the results to be replotted before a graph of percentage weight loss versus sample temperature can be obtained.The aim of the present design was to construct a thermobalance which would enable samples of the order of a few mg to be studied with good resolution at high heating rates, with minimum cool-down time between experiments. It was also required that "buoyancy effects" should be reduced to a level where it was possible to obtain a direct reading of the weight changes.

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“…Typical of polymer applications was the investigation of poly(methyl methacrylate) (193), where generation of the parent ion of the monomer was followed as a function of the heating rate and Arrhenius plots for a first-order reaction were generated. Equipment for simultaneous DTA-mass spectrometric analysis has been described (7). Combined DTA-mass spectrometry was employed to show that heating urea leads to the formation of biuret and cyanuric acid (120) and also that the reactions are not separate, but overlap to a large degree.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Thermal analysis

Murphy¹

1974

Anal. Chem.

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A New Instrument for Simultaneous DTA — Mass Spectrometric Analysis

Cited by 3 publications

References 1 publication

Applications of a simultaneous differential scanning calorimetry–thermomicroscopy system

Applications of a simultaneous differential scanning calorimetry–thermomicroscopy system

A new high sensitivity thermobalance

Thermal analysis

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