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Temperature changes within samples in heat conduction calorimeters

Wadsö, Lars LU (2000) In Thermochimica Acta 366(2). p.121-127
Abstract
So-called isothermal calorimeters are often built on the heat conduction principle. This may sound as a contradiction, as heat conduction is a result of non-isothermal conditions, but most measurements with microcalorimeters and other such instruments are essentially isothermal as the temperature differences within the instruments are in the order of 10 mK. This paper presents simple methods to estimate the temperature changes within a sample in a heat conduction calorimeter during a measurement. It also shows that the determination of activation energy is normally not disturbed by these small temperature changes. In addition to the heat production rate in the sample, the thermal properties of the sample and the calorimeter are needed as... (More)
So-called isothermal calorimeters are often built on the heat conduction principle. This may sound as a contradiction, as heat conduction is a result of non-isothermal conditions, but most measurements with microcalorimeters and other such instruments are essentially isothermal as the temperature differences within the instruments are in the order of 10 mK. This paper presents simple methods to estimate the temperature changes within a sample in a heat conduction calorimeter during a measurement. It also shows that the determination of activation energy is normally not disturbed by these small temperature changes. In addition to the heat production rate in the sample, the thermal properties of the sample and the calorimeter are needed as input to the calculations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Thermochimica Acta
volume
366
issue
2
pages
121 - 127
publisher
Elsevier
external identifiers
  • scopus:0035941561
ISSN
0040-6031
DOI
10.1016/S0040-6031(00)00738-3
language
English
LU publication?
yes
id
fae47f60-e370-4daa-bc9b-259f4ba01263 (old id 1034506)
date added to LUP
2008-02-19 09:11:52
date last changed
2017-01-01 07:12:16
@article{fae47f60-e370-4daa-bc9b-259f4ba01263,
  abstract     = {So-called isothermal calorimeters are often built on the heat conduction principle. This may sound as a contradiction, as heat conduction is a result of non-isothermal conditions, but most measurements with microcalorimeters and other such instruments are essentially isothermal as the temperature differences within the instruments are in the order of 10 mK. This paper presents simple methods to estimate the temperature changes within a sample in a heat conduction calorimeter during a measurement. It also shows that the determination of activation energy is normally not disturbed by these small temperature changes. In addition to the heat production rate in the sample, the thermal properties of the sample and the calorimeter are needed as input to the calculations.},
  author       = {Wadsö, Lars},
  issn         = {0040-6031},
  language     = {eng},
  number       = {2},
  pages        = {121--127},
  publisher    = {Elsevier},
  series       = {Thermochimica Acta},
  title        = {Temperature changes within samples in heat conduction calorimeters},
  url          = {http://dx.doi.org/10.1016/S0040-6031(00)00738-3},
  volume       = {366},
  year         = {2000},
}