论文部分内容阅读
以定量滤纸为生物模板制备了具有滤纸形貌的掺杂NaCl的Na2SO4晶体,经过低温下的吸水和结晶过程合成了相变温度可调的水合盐相变材料(掺杂NaCl的Na2SO4.10H2O)。借助扫描电子显微镜(SEM)、X-射线粉末衍射仪(XRD)和差示扫描量热仪(DSC)对产物的形貌、晶型以及热学性质进行了表征。结果表明:产物很好地遗传了模板的形貌;最终合成的掺杂NaCl的Na2SO4.10H2O在一定范围内随着NaCl掺杂量的增加,相变温度逐渐降低,当NaCl掺杂量达到40mol%时,相变温度可降低约5℃,而相变热仍然可高达106.2J/g。该方法可用来制备其他相变温度可调的水合盐相变材料。
The Na2SO4-doped NaSO4 crystals with filter paper morphology were prepared by quantitative filter paper, and the hydrated salt phase-change material (NaCl-doped Na 2 SO 4 .10H 2 O) with phase transition temperature was synthesized through the process of water absorption and crystallization at low temperature. . The morphology, crystalline form and thermal properties of the product were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and differential scanning calorimetry (DSC). The results showed that the product inherited the morphology of the template well. The phase transition temperature of Na2SO4.10H2O doped with NaCl finally decreased with the increase of NaCl doping concentration. When the NaCl doping amount reached 40mol %, The phase transition temperature can be reduced by about 5 ℃, while the heat of transformation can still be as high as 106.2J / g. This method can be used to prepare other hydrate salt phase change materials with adjustable phase transition temperature.