Jinlu Yang,Tianyi Zhang,Silong Wang,Shengsi Wang,Hongyuan Ding,Jianghui Xie,Dengji Xu,Que Huang,Changcheng Liu
The electrospinning technique not only encapsulates the phase change material (PCM) within a fibrous matrix, thereby preventing its leakage, but also addresses the application limitations associated with graphitic carbon (GC) containing carbonized zeolitic imidazolate framework-67 (ZIF-67). In this study, we prepared flexible nanocomposite fiber membranes using the electrospinning technique. The fibrous membranes exhibit both the excellent thermal management capabilities inherent to phase change materials and the low thermal conductivity characteristic of thermal insulation materials. This phenomenon can be attributed to the fibrous membranes' reliance on molecular chain vibrations and the thermal energy transfer facilitated by gases within the free volume, which makes heat transfer more challenging in these membranes. Conversely, the incorporation of GC enhances the thermal stability and photothermal conversion capabilities of the fibrous membranes. In the simulated heat retention experiment, the fibrous membranes display superior heat preservation performance, and the differential scanning calorimetry (DSC) test reveals that these membranes possess enhanced heat storage capacity. The excellent heat storage and thermal insulation capabilities of the fibrous membranes suggest promising applications in the thermal insulation domain.
Yongshuai Xie,Lin Wang,Ying Peng,Dehua Ma,Luyi Zhu,Guanghui Zhang,Xinqiang Wang
At high temperatures, lightweight ceramic and aerogel materials have serious problems such as volume shrinkage, increased density, loss of flexibility, and decreased thermal insulation performances. The research on high-performance, lightweight, and flexible materials, which can meet the requirements of high-temperature applications, is a challenging topic in the industry. In this work, we developed a defective fluorite phase Y 2 Zr 2 O 7 flexible fibrous membrane (YZFM) material which has excellent thermal stability, no phase change until 1200 °C, and excellent flexibility until 1200 °C. The dense single fiber structure results in the tensile strength of the YZFM as high as 8.27 MPa. The low density (44 mg/cm 3 ), high porosity (99.2%), and excellent heat radiation reflectivity (750–2500 nm: Avg. 96.34%) endow the YZFM with outstanding thermal insulation performance (the thermal conductivity: 38 mW m −1 K −1 ). The 30 mm thick YZFM can reduce the high temperature of 1260 °C to 185 °C. The anisotropic layered structure makes YZFM have better acoustic absorption performance than commercial materials. These robust performances make our YZFM suitable for fields with strict requirements on material usage conditions, such as aerospace and cutting-edge industries.
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