I am studying in disodium hydrogen phosphate salt hydrate and i have big problem for DSC analysis of this material.
in all DSC's reports the latent heat of fusion is lower than the amount contained in the reference.
I'm looking for suitable parameters for DSC analysis like rate of heat flow , start temperature , finish temperature , environment of test
or any parameters maybe important.
It looks like using regular DSC methods may be quite problematic for characterizing salt hydrate PCM, especially those with supercooling. Anyway, in (http://pcm-ral.org/pdf/Paper_GuentherEva.pdf) stepwise DSC is recommended. My own experience shows that meting/dehydration temperature range and latent heat of fusion/dehydration endothermic effect quite reproducibly can be measured at temperature ramps up to 10 C/min. On the other hand, exothermal effects associated with crystallization/hydration of inorganic salt hydrates in regular DSC experiments are very unstable both in terms of their temperature range and released heat.
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