DSC / Differential Scanning Calorimetry

Differential Scanning Calorimetry, DSC, is a technique that is widely used to measure thermal transitions like melting, crystallization and glass transition. It monitors the heat that is absorbed or emitted by a sample in order to keep the temperature the same as that of a reference sample. This way all the thermal transitions that take place as a result of chemical or physical changes can be monitored while the sample is cooled or heated.

The setup is simple and is based on two individually heated pans connected to sensors as shown in the Figure. One pan is the reference pan and the other is the sample holder. The operating principle is based on maintaining the same temperature in both samples. When the material undergoes a transition, heat is either emitted or absorbed (depending on whether the transition is exothermic or endothermic) leading to a change in the sample’s temperature. Any change in the sample’s temperature results in the resistor to channel more or less energy in order to maintain the sample temperature similar to that of the reference. The rate at which the resistor provides power to the sample compared to that of the reference sample gives us information about the transition of the material. The extra energy supplied by the resistor is equal to the heat of fusion ΔΗ needed for the sample to make this transition.

Tool

TA Instruments, Modulated DSC Q200

Applications

Identification of melting, crystallization and glass transition temperatures.
Determination of heat of fusion and degree of crystallinity.
Curing reactions, isothermal and non-isothermal measurements.
Evaluation of pharmaceutical formulations.
Modulated DSC measurements (kinetics, thermodynamic reversibility of transitions).

Temperature Range

With Liquid Nitrogen external Cooling System (LNCS): -180°C to 725°C

Measurement And Analysis Software

Tzero and Modulated DSC technologies, PlatinumTM Software

Additional Information

Dr. Stergios Pispas, pispas@eie.gr

Tool

TA Instruments, DSC 250

Applications

Identification of melting, crystallization and glass transition temperatures
Determination of heat of fusion and degree of crystallinity
Curing Reactions, Isothermal and non-isothermal measurements, Modulated DSC

Sample Environment

Gas flow

Temperature Range

Intracooler: -120oC -500oC
Liquid Nitrogen: -180oC -500oC

Temperature Accuracy

± 0.05°C

Temperature Precision

± 0.008°C

H-precision

± 0.08%

Baseline Flatness

≤ 10 μW

Baseline Repeatability

≤ 20 μW

Baseline Accuracy

± 30 μW

Resolution

0.001 μW

Measurement And Analysis Software

Trios Software

Additional Information

Dr. Kiriaki Chrissopoulou, kiki@iesl.forth.gr

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