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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >TEMPERATURE CALIBRATION OF TEMPERATURE-MODULATED DIFFERENTIAL SCANNING CALORIMETERS
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TEMPERATURE CALIBRATION OF TEMPERATURE-MODULATED DIFFERENTIAL SCANNING CALORIMETERS

机译：温度调制的差示扫描量热仪的温度校准

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Calibration of differential scanning calorimeters (DSC) is essential because it is not possible to calculate heat-how rate and sample temperature directly from the quantities measured. The question arises whether the calibration used in the conventional DSC mode is also valid for temperature-modulated DSC (TMDSC). To prove this, a well-defined transition is needed which does not disturb the temperature profile within the sample during the modulation, the response of the whole system (calorimeter, sample, transition) must be linear. Some low-energy liquid-crystal transitions behave in this way under certain conditions and can be used for temperature calibration in TMDSC. The procedure is demonstrated for a smectic-A-nematic transition in a cyanobiphenyl liquid crystal (80CB). Limitations of the method are discussed - in particular, rate effects. The TMDSC measurements also give some information about the order of phase transitions (80CB:SN - second-order; NI - first-order). (C) 1997 Elsevier Science B.V. [References: 28]
机译：差示扫描量热仪（DSC）的校准至关重要，因为无法直接从所测量的量计算热效率和样品温度。出现的问题是，常规DSC模式下使用的校准是否也适用于温度调制DSC（TMDSC）。为了证明这一点，需要一个定义明确的过渡，该过渡在调制期间不会干扰样品内的温度曲线，整个系统（量热仪，样品，过渡）的响应必须是线性的。在某些条件下，某些低能液晶跃迁会以这种方式运行，并可用于TMDSC中的温度校准。在氰基联苯液晶（80CB）中证明了近晶A向列相转变的程序。讨论了该方法的局限性-特别是速率效应。 TMDSC测量还提供了一些有关相变顺序的信息（80CB：SN-二阶; NI-一阶）。 （C）1997 Elsevier Science B.V. [参考：28]

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