Microcalorimeters sample preparation

Calorimetric measurements were carried out on scanning microcalorimeters developed at the Biocalorimetry Center at the John Hopkins University following standard procedures for sample preparation and data retrieval.[1361... 

Microcalorimetric Measurements. Differential scanning calorimetry was performed with a Microcal MC 2 DSC microcalorimeter. The samples, prepared as described above, were analyzed using a heating rate of. 0.75°C min-1 in the temperature range of 10 to 40°C for DMPC liposomes and 25 to 65°C for DSPC liposomes. 

It is, of course, not necessary to use a heat-flow microcalorimeter in order to determine the heat released by rapid adsorption phenomena. Dell and Stone (74), for instance, using an isoperibol calorimeter of the Garner-Veal type, found an initial heat of 54 4 kcal mole-1 for the adsorption of oxygen on nickel oxide at 20°C. The agreement with the value (60 2 kcal mole-1) in Fig. 19 is remarkably good, particularly if it is considered that very different methods were used for the preparation of the nickel-oxide samples (19, 74)-... 

One of the conclusions deduced from the thermochemical cycle 2 in Table V, for instance, is that in the course of the catalytic combustion of carbon monoxide at 30°C, the most reactive surface sites of gallium-doped nickel oxide are inhibited by the reaction product, carbon dioxide. This conclusion ought to be verified directly by the calorimetric study of the reaction. Small doses of the stoichiometric reaction mixture (CO + IO2) were therefore introduced successively in the calorimetric cell of a Calvet microcalorimeter containing a freshly prepared sample of gallium-doped... 

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