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Practical Applications of HyperDSC in a Pharmaceutical Laboratory

makes power compensation DSC the best technique for analysis at high heating and cooling rates.

The small low-mass furnace (Figure 2) of the power compensation Diamond DSC is highly responsive with respect to the chosen temperature programs. Power compensation provides a direct measurement of the heat flow given off or absorbed by the sample, as well as constant temperature readings up to rates of 500 C/min.

A very short startup transient

As is shown in Figure 3, it takes the Diamond DSC less than 10 seconds to reach a selected temperature setting, even at a rate as high as 500 C/min. Thus, for an experiment beginning at -65 C and carried out at 200 C/min, the apparatus reaches equilibrium at about 30 C, the temperature from which any transition can be measured. By comparison, a classical heat-flux DSC can take 30 to 60 seconds and is not ready for the detection of a transition before +35 C or more likely +135 C, which therefore makes it necessary to start the analysis at a much lower temperature.

A direct, reliable measurement of heat flux up to 500C/min.

The melting peak of an Indium standard has reliable onset and enthalpy values at any chosen heating speed, even at 500 C/min as shown in Figure 4 and Table 1.

HyperDSC's enhanced sensitivity

Fast Scan DSC provides increased sensitivity with decreasing experiment time because the output of a DSC is mW or J/sec. Figure 5 depicts the increase in heat flow signal at higher heating rates.

The enthalpy measured remains the same independent on the scanning rate; only the intensity of the signal is reinforced because of the concentration of energy absorbed or released in a very short time frame.

Analysis of a polymorph mixture

The first sample show
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