A multifunctional electronic skin with thermal radiation regulation and electromagnetic interference (EMI) shielding is urgent for electronic systems because of the thermal radiation emission and electromagnetic wave pollution. Herein, a flexible electronic skin was designed and fabricated, where the polyaniline (PANI) served as the functional layer and Ti 3 C 2 T x MXene was employed as the conductive electrode. The transformation of emeraldine salt (ES) and leucoemeraldine base (LB) of PANI makes the skin achieve an infrared emissivity modulation, and the electromagnetic loss of PANI and ultrahigh electrical conductivity of Ti 3 C 2 T x MXene make it exhibit EMI shielding ability. Benefiting from the special structural design, the multifunctional skin with a small thickness (0.3 mm) and low surface density (0.06 g/cm 2 ) exhibits an excellent infrared emissivity modulation ability (Δε) of 0.32 with emissive power of 119.1 W/m 2 at the wavelength range of 2.5−25 μm and total shielding effectiveness (SE T ) of 36.3 dB over the X-band (8.2−12.4 GHz). Meanwhile, the multifunctional skin remains black in the visible spectrum but a changeable color in the infrared spectrum. Even after repeated bending and twisting, the multifunctional skin still maintains a good emissivity adjustment. The simultaneous realization of dynamic thermal radiation regulation and EMI shielding endows the skin promising potential for various fields, such as adaptive infrared camouflage, thermal regulation, anticounterfeiting, and EMI shielding-related crossing field.
The demand for improved indoor air quality has grown with improvements in the standards of living worldwide. While wood is widely used to construct furniture since it is a renewable resource and aesthetically pleasing, it is also flammable, which limits its applications. Although there have been extensive research efforts in reducing the flammability of wood products, current approaches often have adverse effects on the environment. In this work, a novel organo‐inorganic coordination system is proposed to prepare a fire‐retardant and smoke suppression wooden “air purifier” using a vacuum impregnation method. The “air purifier” is composed of tourmaline particles/KH550 (TPs/KH550) and delignified wood. The added TPs give the final composites capable to purify air (1000 psc cm−3 negative oxygen ions [NOIs]). Compared with pristine wood (PW), total heat release (THR), peak heat release rate (HRR), and smoke production rate (SPR) of the wooden “air purifier” are reduced by 47.88%, 11.73%, and 82.81%, respectively, highlighting that the composites have good fire‐retardancy and smoke suppression performances. Life cycle assessment (LCA) results indicate the composites have minimal environmental impact (EI) in 15 categories. This green, eco‐friendly wooden “air purifier” with fire‐retardant and smoke suppression properties has a great potential application in furniture and buildings.
Transparent wood for smart glass can decrease indoor energy consumption, while simultaneously offering a comfortable indoor temperature and facilitating effective light harvesting. However, high transparency and ultraviolet (UV)‐blocking ability are mutually exclusive in wood‐based materials due to the presence of lignin. Herein, a Turing pattern‐inspired highly transparent wood (TP‐TW) is fabricated via infiltrating the thermal management materials doped‐epoxy (TMM‐epoxy) into the delignified wood with a Turing pattern. Afterward, the Turing pattern possesses outstanding optical properties (high visible transmittance of ≈76% and low UV transmittance of ≈15%). Moreover, TP‐TW can reduce adverse effects caused by indoor temperature fluctuation and outdoor sunlight, demonstrating high latent heat (25.30 J g−1) and low near‐infrared transmittance. Compared with glass, TP‐TW exhibits a low thermal conductivity of 0.21 W m−1 K−1 and excellent shock‐resistant characteristics. Taken together, these results indicate that TP‐TW is an attractive material for smart glass applications.
Reduced CO2 emissions, conversion, and reuse are critical steps toward carbon peaking and carbon neutrality.
Spherical lignin nanoparticles (SLNs) are able to formulate Pickering emulsions with various applications. However, SLN-stabilized emulsions commonly comprise droplets in the micron range, resulting in inevitable instability upon storage. Herein, nonadsorbing cellulose nanofibrils (CNF) are shown to induce stabilization of the diluted SLN-stabilized Pickering emulsions via concentration-dependent depletion effects. Two regimes for such depletion interactions are established, including depletion flocculation-induced droplet aggregation at intermediate CNF concentrations and depletion stabilization of micron-sized droplets over critical CNF concentrations (0.2 wt %). The long-term stability of the SLN-based emulsions against creaming is over two months. The universality of the findings is tested with different initial oil volume fractions and droplet diameters. Overall, this study unveils the depletion effects in SLN-stabilized Pickering emulsions induced by renewable CNF, offering a simple, sustainable route for tailoring their phase behavior and creating ultrastable systems that are available for formulating green products.
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