Hou Xueyan, Li Qianqian, Yang Zehui, Zhang Yuqi, Zhang Wenbo, Wang Ji-Jiang
Key Laboratory of New Energy & New Functional Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University Yan'an Shaanxi 716000 PR China
Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry & Technology, Shaanxi University of Science & Technology Xi'an Shaanxi 710021 PR China.
RSC Adv. 2020 Jul 14;10(44):26494-26503. doi: 10.1039/d0ra03554h. eCollection 2020 Jul 9.
Humidity and temperature control materials have attracted increasing attention due to their energy saving and intelligent regulation of human comfort in the field of interior building and clothing. Phase change microcapsules have been widely used, however, most of which focus on temperature regulation without humidity control. In this work, we report a novel temperature-humidity dual regulation microcapsule with single-core-double-shell structure. FT-IR and XRD measurements confirmed that the shell materials were successfully fabricated on the paraffin core electrostatic-assembly and the subsequent chemical precipitation method. SEM, TEM and optical microscope photos showed that the microcapsules were spherical morphology with layer-by-layer shells at a diameter around 2-5 μm. The SiO shell was aggregated from nano-sized particles and formed a loose and porous micro-structure, supported by the result of N adsorption-desorption isotherms. In addition, the synergistic effect of hydrophilic and porous loose (chitosan/GO/chitosan)-SiO double shells endowed the microcapsules with humidity regulation. The constructed microcapsules showed temperature regulation behavior due to its phase change performance of paraffin and good thermal durability after 10 thermal cycles. They also showed stable humidity regulation performance after repeated adsorption/desorption. The simulation experiments of temperature and humidity regulation indicated that the microcapsule could keep the temperature and humidity in a stable range. The as-prepared microcapsules have outstanding temperature and humidity regulation properties, showing an application prospects in energy-saving fields.
由于在室内建筑和服装领域具有节能以及对人体舒适度的智能调节功能，湿度和温度控制材料已受到越来越多的关注。相变微胶囊已被广泛应用，然而，其中大多数仅专注于温度调节而无湿度控制功能。在本研究中，我们报道了一种具有单核 - 双壳结构的新型温湿度双调节微胶囊。傅里叶变换红外光谱（FT - IR）和X射线衍射（XRD）测量结果证实，通过静电组装和随后的化学沉淀法成功地在石蜡核上制备了壳材料。扫描电子显微镜（SEM）、透射电子显微镜（TEM）和光学显微镜照片显示，微胶囊呈球形，具有逐层的壳结构，直径约为2 - 5μm。通过氮气吸附 - 脱附等温线结果表明，SiO壳由纳米级颗粒聚集而成，形成了疏松多孔的微观结构。此外，亲水性和多孔疏松的（壳聚糖/氧化石墨烯/壳聚糖）-SiO双壳的协同作用赋予了微胶囊湿度调节功能。所制备的微胶囊由于其石蜡的相变性能而表现出温度调节行为，并且在10次热循环后具有良好的热耐久性。在反复吸附/脱附后，它们还表现出稳定的湿度调节性能。温湿度调节的模拟实验表明，该微胶囊能够将温度和湿度保持在稳定范围内。所制备的微胶囊具有优异的温湿度调节性能，在节能领域展现出应用前景。
