CAJ | 학술논문

水合盐作为一种固-液相变材料因具有高的能量储存密度而备受关注。然而，其过冷和相分离的缺陷限制了它的应用。为了解决过冷及相分离问题，文章提出了采用在硫酸钠饱和溶液中原位聚合的方法制备硅胶。根据实验结果，硅胶中饱和硫酸钠水溶液的潜热为238.1 J/g，相变温度为30℃。通过添加这种添加剂，它可以在亚热带春夏季时期承受长达五个月以上的冷热循环。通过扫描电子显微镜和傅里叶变换红外光谱检测发现，实验制备的硅胶是无定型结构，并有一些小的晶体分布其中。实验推断，硅胶的添加提供了一种多孔结构，有助于硫酸钠水合盐晶体的生长，因此，它可以抑制过冷和相分离的发生。
수합염작위일충고-액상변재료인구유고적능량저존밀도이비수관주。연이，기과랭화상분리적결함한제료타적응용。위료해결과랭급상분리문제，문장제출료채용재류산납포화용액중원위취합적방법제비규효。근거실험결과，규효중포화류산납수용액적잠열위238.1 J/g，상변온도위30℃。통과첨가저충첨가제，타가이재아열대춘하계시기승수장체오개월이상적랭열순배。통과소묘전자현미경화부리협변환홍외광보검측발현，실험제비적규효시무정형결구，병유일사소적정체분포기중。실험추단，규효적첨가제공료일충다공결구，유조우류산납수합염정체적생장，인차，타가이억제과랭화상분리적발생。
Hydrate salt is an attractive solid-liquid phase change material because of its high energy storage density. However, its applications have been limited owing to the supercooling and phase segregation. In order to solve these problems, we propose to make the silica gel in the saturated solution of sodium sulfate by means of in-situ polymerization. According to our experiments, the latent heat of saturated solution of sodium sulfate in silica gel is about 238.1 J/g and the phase change temperature is 30℃. With some surfactant, it can endure more than five months of heating-cooling cycles stably in subtropical spring and summer. Using scanning electron microscope and Fourier transformation infrared spectroscopy, we found that the microstructure of silica gel was mainly amorphous with some small crystals distributed in it. We believe that adding the silica gel produces a porous structure, which helps the crystal growth of sodium sulfate hydrate and hence, suppresses the supercooling and phase segregation.