Dear Yosra Kotp,

The Differential Scanning Calorimetry (DSC) can be used to measure the heat capacity of material systems, as well as the change of enthalpy (ΔΗ) for dramatic phase transformation processes, chemical reactions, ionizations, dissolutions in solvents, vacancy formation, and so on.

The standard enthalpy of formation is defined as the change in enthalpy, when 1 mole of a substance in the standard state are formed from elemental constituents in their stable states.

Method for Sample Measurement:

I hope I have answered your question.

With Best Wishes,

Samir G. Pandya

Generally, the differential scanning calorimetry (DCS) is an useful tool to do that.

DSC will be useful. Select the desired temperature range corresponding to the reaction temperature.

Dear Yosra Kotp,

The Differential Scanning Calorimetry (DSC) can be used to measure the heat capacity of material systems, as well as the change of enthalpy (ΔΗ) for dramatic phase transformation processes, chemical reactions, ionizations, dissolutions in solvents, vacancy formation, and so on.

The standard enthalpy of formation is defined as the change in enthalpy, when 1 mole of a substance in the standard state are formed from elemental constituents in their stable states.

Method for Sample Measurement:

I hope I have answered your question.

With Best Wishes,

Samir G. Pandya

Measurement and calculation of the enthalpy change during the formation of nanoparticles is not an easy task. We measure and calculate the enthalpy of formation of simple AgCl nanoparticles. In the calorimeter, you combine two salt solutions. Ion reaction occurs

Ag+ + Cl- = AgCl.

The reaction does not form nanoparticles, but large particles. To obtain nanoparticles, it is necessary to add a stabilizer. It is necessary to add as little as possible to form a monolayer. Otherwise, the thermal effects of dilution, stabilizer hydration will appear. The enthalpy of formation of the surface makes a large contribution to the enthalpy of nanoparticle formation. But if you added a stabilizer, then you reduce the enthalpy of formation of the surface of the nanoparticles.

Thus, the change in the enthalpy of formation of nanoparticles consists of three contributions: the enthalpy of formation of large crystals, the enthalpy of formation of the surface, the enthalpy of plastic deformation of nanocrystals. These contributions may be of different signs.