金属有机框架基防冰膜的制备及其性能

Metal-Organic Framework-Based Anti-icing Coatings:Synthesis and Their Properties

采用点击化学反应在UiO-66-NH2膜表面原位生长硅油润滑层,制备了金属有机框架(MOF)基防冰膜(OGMCs),通过硅油生长时间调控了表面硅油量,并对不同硅油含量的OGMC的防冰性能进行了研究。利用扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)、X射线衍射仪(XRD)、X射线光电子能谱分析仪(XPS)和接触角等技术手段对OGMCs表面进行了表征。结果表明:硅油被成功合成出来,并以共价键方式与MOF膜连接。OGMC保留了MOF膜表面原有的微纳复合结构以及UiO-66的晶体结构。OGMC表面的硅油量随硅油生长时间而增加。但表面冰成核温度和冰粘附力均随硅油生长时间而先下降后升高。硅油量密切影响微纳复合结构表面的防冰性能。当硅油生长时间为12~18 h,表面硅/锆物质的量比在8~12时,表面防冰效果最佳,表面冰成核温度可达到-29.6℃,冰粘附力达到8.8 kPa。

In this paper,a MOF-based anti-icing coating was prepared by in situ synthesis of the silicone oil lubricating layer on the UiO-66-NH2 coating via click reaction.The amount of silicone oil on surface wastuned by reaction time.The anti-icing performance of the oil-grafted MOF coatings(OGMCs)with different amounts of silicone oil was investigated.The surface morphology and composition were characterized by scanning electron microscopy(SEM),Fourier transform infrared spectrometer(FT-IR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and contact goniometer.The results show that silicone oil is successfully synthesized and covalently bond to MOF.The OGMCs keep the original micro-nanostructures of MOF coating,as well as the crystal structure of UiO-66.The amount of silicone oil on OGMC increases with reaction time,however,the ice nucleation temperature and ice adhesion decreases first and then increases when the reaction time increases.The anti-icing performance of MOF coating is closely related with the amount of silicone oil.The anti-icing performance of OGMC is optimized when the reaction time is 12~18 h and the molar ratio of Si to Zr is 8~12.The ice nucleation temperature reaches-29.6℃and the ice adhesion reaches 8.8 kPa.