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	DSC 204 F1 Phoenix® - Application Example µSensor

New µ-Sensor Technique for DSC 204 F1 Phoenix®   Offering both outstanding sensitivity and excellent resolution simultaneously, the µ-Sensor guarantees comprehensive measurement results, especially if only a small sample mass is available. This newly developed sensor which works in a temperature range from -150 to 400°C is ideal for pharmaceuticals, biomaterials and foods.   For demonstrating the high signal-to-noise ratio of the new µ-Sensor, 0.27 mg of 4,4'-azoxyanisole were measured in a closed standard aluminum crucible at a heating rate of 1 K/min according to the sensitivity test in [1]. This substance shows two transitions: a large solid to liquid crystal transition at about 117°C and a much smaller liquid crystal to isotropic liquid transition at about 134°C. Fig. 1 illustrates the raw data with an endothermal peak of the second transition at 134.6°C with a peak height of 0.05 mW in comparison to a peak-to-peak noise of only 0.5 µW.     The high sensitivity and simultaneously excellent resolution of the µ-Sensor guarantees comprehensive measurement results even for diluted substances. Fig. 2 apart from the ice melting peak, a further peak at -1.7°C was detected for a 10% aqueous solution of a sugar alcohol. The presentation shows the enlarged scaling of this effect confirming the extremely low noise level (sample mass: 3.6 mg, heating rate: 1 K/min).     back