Thermal Analysis Tips and Hints - METTLER TOLEDO

Thermal Analysis Tips and Hints

An example from the handbook: How to improve the resolution and/or sensitivity of a DSC measurement

 

 

Resolution

Sensitivity

 

Definition

Ability to separate close-lying effects

Ability to reliably detect a small effect

Possibilities for improvement

  • lower heating rates
  • lighter crucibles
  • smaller sample mass
  • better contact between the sample and crucible
  • atmosphere: gases with high thermal conductivity, e.g. helium
  • higher sampling rate
  • higher heating rates
  • larger sample mass
  • compensation of the heat capacity of the sample using an inert material such as Al2O3 powder on the reference side
  • higher sampling rate

To separate overlapping effects

  1. Compare the first and second runs (heating and/or cooling)
  2. Use lower heating rates
  3. Use hermetically sealed crucibles (shifts evaporation processes to higher temperatures)
  4. Use a temperature-modulated technique (TMDSC) such as:
    - IsoStep®
    -ADSC or
    - TOPEM®
 
 
 
 
 
 
 
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