Dear Kiran

When specific heat change takes place a shift in the base line is observed in DSC scan. This shift is noted at each temperature and shift per unit mass is calculated. Then a standard sample of known mass and known specific heat is used for DSC scan. By dividing the shift per unit mass in two cases specific heat of your sample can be obtained at different temperatures. First you have to take base line without any sample in the pans. This should be a horizontal line.All the shift has to be noted with respect to this base line.

thank u very much Dr. Kumar sir for your kind information

you can see the attachment. It is one of my paper that measure the heat capacity of PE by DSC method.

THANK U HOJJAT SIR

Experimentally what you should do is represented in the image I send you.

Then with the heats for each temperature, isoStep Mode, you calculate the heat capacity:

Cp=Cp(reference)*(densidade 1/densidade 2)*(Q2-Q0)/(Q1-Q0)

Hi Monica,

Can you share me the details about the source of this figure.

Sathiyaraj

This exact figure comes in the Manual of the microDSCIII Setaram. It is considered a standard precedure. The idea is that with the empty vessels you account for asymmetries of the capsules, with the reference vessel you account for equipment asymmetrys and then you measure your sample and subtract those influences. This could change if you do a Joule effect calibration where the equipment asymmetries are calibrated and there is no need for a reference in the case of closed vessels.

Any other question please ask.