Why Does My DSC Baseline Go Below Zero?

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Discussion Overview

The discussion revolves around the phenomenon of a Differential Scanning Calorimetry (DSC) baseline going below zero, exploring potential reasons for this occurrence. Participants consider various factors that may influence the baseline readings, including calibration issues and sample behavior.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests that bad calibration could be a reason for the negative baseline readings.
  • Another points out that the absolute value of the baseline may not be significant, as it is relative to the initial value set by the user.
  • A different participant proposes that the transition between polymorphs might release energy, potentially causing the baseline to drop below zero.
  • There is a question raised about whether the same sample has been run multiple times and if the negative value was consistently observed.

Areas of Agreement / Disagreement

Participants express differing views on the causes of the negative baseline, with no consensus reached on a single explanation.

Contextual Notes

Participants have not fully explored the assumptions behind calibration methods or the specific conditions of the samples being tested, leaving some aspects unresolved.

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My baseline for the DSC goes past zero (below 0 W/g) why would the instrument be doing this?
 
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This may be obvious, but: Bad calibration?
 
it goes relative to the initial value you put in. the absolute number does not mean much.
 
Perhaps you converted from one polymorph to another and a little energy was released? Have you run the same sample twice and noticed the negative value again?
 

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