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采用微量热-热分析在表面形态变化中的应用
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The ability to measure the localised thermal properties of a sample is a powerful capability of Micro-Thermal Analysis as it enables the differences between bulk and surface properties to be studied. The surface properties have a critical bearing on the stability, reactivity and performance of a material. Often important surface properties are masked in conventional thermal analysis measurements as their influence is “averaged” over the bulk response of the material. Consequently, valuable information regarding the surface morphology of the sample is lost. Micro-Thermal Analysis provides a unique way to study the surface transition temperatures and to measure their changes across the surface of a material. In conventional thermal analysis, a sample of known mass (typically a few milligrams) is placed in a furnace. The furnace surrounds the entire sample. The heating rate for such experiments is selected in accordance with the size of the sample, as well as the size of the furnace in order to minimise thermal gradients within the sample. For DSC experiment one would typically use 10 to 20 °C/min. For DMA experiments, where the sample (and therefore the furnace) is larger, heating rates of 2 to 3 °C/min are typical. |
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2017-02-17 10:05:58, 502.51 K
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