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Home Analytical Instruments Thermal Analysis Excellence Temperature Modulate DSC Instruments
Temperature Modulate DSC Instruments
Home Analytical Instruments Thermal Analysis Excellence Temperature Modulate DSC Instruments

Temperature Modulate DSC Instruments

TMDSC Helps Separate Overlaying Thermal Effects

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Temperature Modulated Differential Scanning Calorimetry (TMDSC) works by subjecting a sample to a temperature oscillation, which can be superimposed on a linear heating or cooling program. It is used to separate overlapping temperature-dependent and time-dependent thermal effects.
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What does latent heat flow stand for?

The term "latent heat flow" refers to the transfer of heat that accompanies a phase change in a substance. This heat is referred to as "latent" because it is not associated with a change in temperature, but rather with a change in the physical state of the substance (e.g. from solid to liquid or from liquid to gas).

What is sensible heat flow?

Sensible heat flow refers to the transfer of heat that is associated with a change in temperature of a substance, but not a change in its physical state.

What is the difference between latent and sensible heat flow?

The main difference between latent and sensible heat flow is the nature of the heat transfer. Sensible heat flow involves the transfer of heat between two substances that are at different temperatures, resulting in a change in temperature of the receiving substance. On the other hand, latent heat flow involves the transfer of heat between two substances that are at the same temperature, resulting in a change in the physical state of the receiving substance.

How does temperature modulated DSC separate the latent and sensible heat flows?

As a result of the modulation, the phase transition signal is split into two parts: a modulated component and a baseline component. The modulated component corresponds to the latent heat flow, which is associated with the phase transition itself, while the baseline component corresponds to the sensible heat flow, which is associated with the temperature change of the sample.

What techniques of TMDSC does METTLER TOLEDO offer?

METTLER TOLEDO offers three different measurement techniques for TMDSC, including ADSC, IsoStep, and TOPEM.  

What is the advantage of temperature modulated DSC (TMDSC)?

With conventional DSC, it is not possible to separate the latent and sensible heat flows. In contrast, temperature modulated DSC, or TMDSC, enables the separation of the measured DSC output signal into what is called the reversing heat flow (cp information) and the non-reversing heat flow (excess heat production); this allows you to understand and interpret the different thermal events that occur in the sample and to distinguish between overlapping effects.

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