热分析(TGA+DSC)样品锅为LINSEIS STA PT 1600陶瓷坩埚尺寸D6.4*8mm为LINSEIS(样品锅)D6.4*8mm氧化铝坩埚样品锅为LINSEIS DSC和TGA测量。95μl氧化铝坩埚D7*5*0.6mm for Linseis(样品锅)300ul Linseis STA Special Shape Alumina pan for Linseis (Sample Pans) for Linseis STA DSC and TGA measurement . manufacturer for Linseis坩锅和样品锅。3ml Linseis STA陶瓷坩埚用于Linseis(样品锅)3ml Linseis STA特殊形状氧化铝锅用于Linseis STA DSC和TGA测量。95μl氧化铝陶瓷圆片用于Linseis的DSC和TGA测量。制造商为Linseis坩埚和样品锅。第一个

DSC和DTA之间的差异。（来自耐驰热分析）根据DIN 51 007，差热分析（DTA）适用于测定特征温度，而差示扫描量热法（DSC）此外，还允许测定热值，如熔化热或结晶热。这可以通过两种不同的测量技术完成：热流差示扫描量热法或功率补偿差示扫描量热法。由于所有DSC仪器均基于热通量原理，因此在以下章节中将仅对该方法进行更详细的讨论。对于DTA和热流DSC，测量期间的主要测量信号是样品和参考品之间的温差，单位为µV（热电压）。对于DSC，可通过适当的校准将该温差转换为热通量差（单位：mW）。纯DTA仪器不存在这种可能性。有关DSC和DTA样品盘的更多信息，请访问：//www.vinnote.com

dsc是什么意思？差示扫描量热法，或差示扫描量热仪。差示扫描量热法，或DSC，是一种热分析技术，在该技术中，增加样品和参考样品温度所需热量的差异作为温度的函数进行测量。在整个实验过程中，样品和参考样品都保持在几乎相同的温度。通常，DSC分析的温度程序的设计应确保样品架温度随时间线性增加。参考样品应在待扫描温度范围内具有明确定义的热容。该技术由E.S.Watson和M.J.O'Neill于1962年开发[1]，并在1963年匹兹堡分析化学和应用光谱学会议上进行了商业化介绍。1964年，P.L.Privalov和D.R.Monaselidze在格鲁吉亚第比利斯物理研究所开发了第一台可用于生物化学的绝热差示扫描量热仪。[2]术语DSC是用来描述这种仪器的，它直接测量能量，并允许精确测量热容。[3]相变检测这项技术的基本原理是，当样品经历物理相变（如相变）时，需要比参考样品多或少的热量才能将两者保持在相同的温度。流向样品的热量是少还是多取决于该过程是放热的还是吸热的。例如，当固体样品融化为液体时，需要更多的热量流向样品，以与参考温度相同的速率增加其温度。这是由于样品在经历从固体到液体的吸热相变时吸收了热量。同样，当样品经历放热过程（如结晶）时，需要较少的热量来提高样品温度。通过观察样品和参考样品之间的热流差异，差示扫描量热仪能够测量此类转变过程中吸收或释放的热量。DSC也可用于观察更细微的物理变化，如玻璃化转变。由于其在评估样品纯度和研究聚合物固化方面的适用性，它在工业环境中被广泛用作质量控制仪器。[4][5][6]DTA与DSC有许多共同点的另一种技术是差热分析（DTA）。在这种技术中，样本和参考的热流保持不变，而不是保持温度不变。当样品和参比品加热相同时，相变和其他热过程会导致样品和参比品之间的温差。DSC和DTA都提供类似的信息。DSC测量将参考和样品保持在相同温度所需的能量，而DTA测量将相同能量引入参考和样品中时样品和参考之间的温差。DSC曲线顶部：维持每个温度（x）所需能量输入量（y）的示意性DSC曲线，在一个温度范围内扫描。底部：设定初始热容作为参考的标准化曲线。缓冲基线（虚线）和蛋白质缓冲差异（实线）。使用基线作为参考（左）的标准化DSC曲线，以及两态（顶部）和三态（底部）蛋白质在每个温度下存在的每个构象状态（y）的分数（右）。请注意三态蛋白质DSC曲线峰值的微小加宽，这对肉眼来说可能有统计学意义，也可能没有统计学意义。DSC实验的结果是热流密度与温度或时间的曲线。有两种不同的惯例：样品中的放热反应显示为正峰或负峰，具体取决于实验中使用的技术类型。该曲线可用于计算相变焓。这是通过积分对应于给定跃迁的峰值来实现的。可以表明，转变焓可以用以下方程式表示：式中，\ΔH是转变焓，K是量热常数，A是曲线下的面积。量热计常数因仪器而异，可通过分析具有已知转变焓的表征良好的样品来确定。[5]应用差示扫描量热法可用于测量样品的许多特征特性。使用该技术可以观察熔融和结晶事件以及玻璃化转变温度Tg。DSC还可用于研究氧化以及其他化学反应。[4][5][7]随着非晶态固体温度的升高，可能会发生玻璃化转变。这些是transitions appear as a step in the baseline of the recorded DSC signal. This is due to the sample undergoing a change in heat capacity; no formal phase change occurs.[4][6] As the temperature increases, an amorphous solid will become less viscous. At some point the molecules may obtain enough freedom of motion to spontaneously arrange themselves into a crystalline form. This is known as the crystallization temperature (Tc). This transition from amorphous solid to crystalline solid is an exothermic process, and results in a peak in the DSC signal. As the temperature increases the sample eventually reaches its melting temperature (Tm). The melting process results in an endothermic peak in the DSC curve. The ability to determine transition temperatures and enthalpies makes DSC a valuable tool in producing phase diagrams for various chemical systems.[4] Examples The technique is widely used across a range of applications, both as a routine quality test and as a research tool. The equipment is easy to calibrate, using low melting indium at 156.5985 °C for example, and is a rapid and reliable method of thermal analysis. Polymers DSC is used widely for examining polymeric materials to determine their thermal transitions. The observed thermal transitions can be utilized to compare materials, although the transitions do not uniquely identify composition. The composition of unknown materials may be completed using complementary techniques such as IR spectroscopy. Melting points and glass transition temperatures for most polymers are available from standard compilations, and the method can show polymer degradation by the lowering of the expected melting point, Tm, for example. Tm depends on the molecular weight of the polymer and thermal history, so lower grades may have lower melting points than expected. The percent crystalline content of a polymer can be estimated from the crystallization/melting peaks of the DSC graph as reference heats of fusion can be found in the literature.[8] DSC can also be used to study thermal degradation of polymers using an approach such as Oxidative Onset Temperature/Time (OOT), however, the user risks contamination of the DSC cell, which can be problematic. Thermogravimetric Analysis (TGA) may be more useful for decomposition behavior determination. Impurities in polymers can be determined by examining thermograms for anomalous peaks, and plasticisers can be detected at their characteristic boiling points. In addition, examination of minor events in first heat thermal analysis data can be useful as these apparently "anomalous peaks" can in fact also be representative of process or storage thermal history of the material or polymer physical aging. Comparison of first and second heat data collected at consistent heating rates can allow the analyst to learn about both polymer processing history and material properties. Liquid crystals DSC is used in the study of liquid crystals. As some forms of matter go from solid to liquid they...

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