Browsing by Author "Chen, YF"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Bionic root inspired CNT/regenerated cellulose aerogel membrane/Cu nanowires for enhancing physiological comfort
    Chen, YF; Zhang, RQ; Qiu, FX; Zhang, T; Yang, DY; Yurekli, Y
    Traditional thermal management and humidity management systems consume a large amount of energy and thus aggravate the energy crisis. Here, CNT/regenerated cellulose aerogel membrane/copper nanowires (CRCAMCNWs) with thermal and humidity management were successfully fabricated using layer-by-layer assembly. This composite takes advantage of high infrared reflectivity of the copper (Cu) nanowires and the high solar absorptivity of CNTs. Under simulated sunlight exposure, the surface temperature of CRCAMCNWs was 11.4 degrees C higher than the regenerated cellulose aerogel membrane, indicating that CRCAMCNWs have excellent thermal management properties. The excellent sweat transport properties of CRCAMCNWs are demonstrated by the fact that water can penetrate from the Cu side to the inside within 3.5 s. For insensible sweat, the water vapor transmission rate of CRCAMCNWs is 0.708 mg cm(-2) h(-1), which transfer insensible sweat from the inner side of to the outer side for enhanced wearer comfort. Moreover, CRCAMCNWs exhibit excellent antibacterial properties due to the presence of Cu nanowires. This work not only provides a recycling strategy to fabricate bionic-root inspired wearable materials by using sugarcane bagasse as raw material but also demonstrates intriguing applications in enhancing physiological comfort thanks to its low energy consumption and environmental friendliness.
  • No Thumbnail Available
    Item
    Facile construction of Janus MXene/cellulose/ZnO membrane with EMI shielding property for on-demand personal thermal management
    Zhao, BC; Li, CZ; Chen, YF; Tian, Q; Yurekli, Y; Qiu, FX; Zhang, T
    To handle the increasingly harsh living space caused by extreme temperatures and floods of electromagnetic waves, wearable materials have been attracting much attention for decades due to their good versatile compatibility and precise utility. In this work, a Janus MXene/cellulose/ZnO nanorods membrane for accurate on-demand personal thermal management and electromagnetic interference shielding was fabricated via hydrothermal treatment and vacuum-assisted filtration, followed by a hydrophobization process. The ZnO nanorod side of obtained Janus membrane exhibits a high visible reflectance (96.3%) and infrared emissivity in the atmospheric window band (0.837). The corresponding visible absorption and average infrared reflectivity (5-25 mu m in wavelength) of the MXene side are over 90% and 0.7, respectively. Remarkable temperature differences on both sides (7 degrees C increment on MXene side and 5 degrees C reduction on ZnO side compared to bare wooden board) were achieved in the validation test under direct sunshine, reflecting to the great optical properties and radiative thermal management performances of the obtained membrane. Moreover, the water contact angles (>= 120 degrees) indicated the hydrophobicity and associated stain resistance of this membrane. Active Joule heating and electromagnetic interference shielding characteristics have been successfully introduced into the Janus membrane by means of the integration of MXene. A rapid increase in temperature to 75 degrees C was attained within a 1 min of low voltage (2 V) applying. The effectiveness of the electromagnetic shielding (similar to 30 dB) was higher than the commercial shielding materials. The results in general, provide a promising solution to protecting people from temperature extremes and electromagnetic waves interference in modern living space.