Fiber‐spinning Asymmetric Assembly for Janus‐structured Bifunctional Nanofiber Films towards All‐Weather Smart Textile

Abstract

Given health threat by global warming and increased energy consumption in regulating body temperature, it is an urgent need to construct smart temperature‐regulating materials. Herein, a novel fiber‐spinning asymmetric chemical assembly (FACA) method is proposed to construct nanofiber materials with asymmetric photothermal properties. The silver nanowires (AgNWs) and poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP) with opposite thermal radiation are assembled on reduced graphene oxide (rGO) film, imparting AgNW/rGO/PVDF‐HFP film with Janus structure that can realize the AgNWs side consistently keeps temperature of ca. 11 °C lower than the side of PVDF‐HFP nanofiber regardless of the irradiation directions under 1 sun, suggesting the adjustable photothermal regulation. Such photothermally selective hybrid nanofiber film provides great potential as fabrics to achieve all‐weather smart clothes, promoting controllable and comprehensive utilization of solar energy.

Transparent and Flexible Composite Films with Excellent Electromagnetic Interference Shielding and Thermal Insulating Performance

“…The peaks at 30.5°, 35.5°, 51°, and 60.6° correspond to (222), (400), (440), and (622) of In 2 O 3 , respectively. And 38.2° and 44.5° can correspond well to the (111), (200) crystal plane of Ag . The presence of ITO with AgNWs in the films is confirmed.…”

“…And 38.2°and 44.5°can correspond well to the (111), (200) crystal plane of Ag. 46 The presence of ITO with AgNWs in the films is confirmed. No other impurity peaks were found in them, indicating that no oxidation of Ag occurred during the preparation process.…”

Bi2O3/Gd2O3 Meta-Aerogel with Leaf-Inspired Nanotrap Array Enables Efficient X-Ray Absorption

“…The interlocked structure could be attributed to the large length-to-diameter ratio of the nanofibers, which could be achieved by controlling the emulsification and dispersion process. Moreover, through the implementation of a gradient calcination strategy, the fusion of nanograins within the nanofiber crystals was effectively achieved. − In addition, by adjustment of the electrospinning process and the subsequent calcination parameters, flexible β-Bi 2 O 3 and γ-Gd 2 O 3 nanofibers were obtained. Transmission electron microscopy (TEM) images in Figure c show that the Bi 2 O 3 and Gd 2 O 3 nanofibers represent smooth surfaces and clear lattice stripes, which was consistent with the results of XRD (Figure b).…”

A Trilayer Structure with Surface Binary Microsphere Array for Radiative Cooling and Heating Regulation

“…Efforts toward these integrated systems have focused on active on-demand and passive adaptive modes based on their driving force of mode switching. The passive adaptive system is typically triggered by ambient temperature or humidity variation, but its implementation has been largely limited to visible and near-infrared wavelength regimes, ,− such as the poly­( N -isopropylacrylamide) (PNIPAm) hydrogel and thermochromic chameleon microcapsules we reported previously. , Active on-demand tuning systems, such as mechanical and electrochromic methods, enable a synergistic and programmable radiative regulation in a substantially wide bandwidth from ultraviolet (UV, ∼300 nm in wavelength) to mid-infrared (MIR, ∼25 μm for ambient thermal radiation or ∼14 μm for atmospheric window) and are more favorable in real applications. − Conceptually, as shown in Figure a,b, ideal radiative cooling with a solar absorptivity (0.3–2.5 μm) of 0 (solar reflectivity of 1.0) and MIR emissivity (2.5–25 μm) of 1.0 in hot weather is desirable. On the contrary, ideal radiative heating is expected to have a solar absorptivity of 1.0 (solar reflectivity of 0) and MIR emissivity of 0 to suppress enormous heat dissipation via thermal reradiation in cold outside environments, showing the exactly opposite requirement for cooling and heating modes.…”