A COMBINED DIFFERENTIAL SCANNING CALORIMETER OPTICAL VIDEO MICROSCOPEFOR CRYSTALLIZATION STUDIES

A simultaneous differential scanning calorimeter (DSC)-optical video m icroscope instrument has been developed. The instrument development in cluded slight modifications to the sample head of a Perkin-Elmer DSC-7 , along with the use of a CCD camera and magnifying lenses. The instru ment permitted simultaneous following of optical and thermal events du ring isothermal and non-isothermal DSC experiments. The DSC curves wer e almost identical to those given by a standard DSC-7. The operational temperature range of the instrument is between -160 to 600 degrees C. The capabilities of the DSC-video microscope are illustrated by examp les of ice crystallization data in aqueous solutions of glycerol and d imethyl sulphoxide.