硬脂酸/膨润土纳米复合相变储热材料的制备、结构与性能

引　言相变储热技术可用于解决热能供给和需求失配的矛盾 ,在太阳能利用、电力的“移峰填谷”、废热和余热的回收利用以及工业与民用建筑采暖与空调的节能等领域具有广阔的应用前景1] .其技术关键就是高性能相变储热材料的应用 .近年来 ,国内外学者不断致力于储热材料的研究工

PREPARATION,STRUCTURE AND PROPERTIES OF STEARIC ACID/BENTONITE NANOCOMPOSITE PHASE CHANGE THERMAL ENERGY STORAGE MATERIAL

A nanocomposite phase change thermal energy storage material was prepared by intercalating stearic acid into the nano-layers of modified bentonite in liquid media. XRD patterns showed that the intergallery distance of the nanocomposite material was larger than that of modified bentonite owing to intercalating of stearic acid. The phase change temperature of the nanocomposite phase change material was different from that of stearic acid,and its phase change latent heat was equivalent to the calculated value based on the mass ratio of stearic acid in the composite. The experimental results of thermal energy storage and release indicated that the heat transfer rate of the nanocomposite material was obviously higher than that of stearic acid. After the nanocomposite experienced 1500 times cooling-heating cyclic test,its phase change temperature and latent heat showed little change,which suggested that the stearic acid/bentonite nanocomposite phase change material exhibited good stability of structure and properties. This method of intercalating organic phase change material into the nano-layers of bentonite provides a new route to prepare phase change materials with high performances.