Abstract
A high sensitivity and high resolution DSC working between 220 and 400K with a baseline stability of ±3nW, with a low noise of nV order, with a quick response time of 2s and with a temperature resolution of 0.1mK, capable of measuring in the both directions of heating and cooling has been designed and constructed. The stability of the baseline was achieved by the use of a high sensitive temperature sensor, a precise temperature control of ±0.1mK, an adiabatic control, the damping devices to decrease the temperature fluctuation at the sample cell and the devices to decrease noises on the lead wires. Very fine structures of phase transitions were observed at a cooling rate of 5μKs-1 in the measurement of C22H46 by application of the nW-stabilized DSC. The measurement of the melting of C15H31COOH and C32H66 employing very small samples of μg order was carried out as well and the results demonstrated the high sensibility of the nW-stabilized DSC.
