A waste textiles-based multilayer composite fabric with superior electromagnetic shielding, infrared stealth and flame retardance for military applications

Recent Advances in Material Engineering and Applications for Passive Daytime Radiative Cooling

Surface hydrophobicity is generally created by lower surface energy materials. However, it is predictable. Simultaneously, it is rare to construct a self-healing surface hydrophobicity using hydrophilic materials, which is an emerging and significant aspect. Herein, we for the first time fabricated the unpredictable surface hydrophobicity on the cotton fabric surface by utilizing chitosan and tannic acid (labelled as Cot@PTA@PTA-CS), in which chitosan played the decisive role. Interestingly, the surface hydrophobicity of Cot@PTA@PTA-CS could be recovered under the heating treatment. Notably, using the hydrophilic materials realizes the unpredictable surface hydrophobicity with self-healing characteristics, which is an advanced work in contrast to the conventional predictable surface hydrophobicity created by fluorine-free hydrophobic or fluorinated materials. Then, Cot@PTA@PTA-CS was treated with polydimethylsiloxane to obtain surface superhydrophobicity, regarded as Cot@PTA@PTA-CS@PDMS. Cot@PTA@PTA-CS@PDMS and Cot@PTA@PTA-CS all exhibited good hydrophobicity after mechanical abrasion. Moreover, Cot@PTA@PTA-CS@PDMS exhibited good repellency to 95 °C water, diiodomethane, ethylene glycol, and dimethyl sulfoxide. So, the surface free energies of modified cotton fabrics were calculated. Besides, the modified cotton fabrics also possessed excellent UV resistance, anti-oxidation activity, photothermal effect, and self-cleaning. Finally, Cot@PTA@PTA-CS@PDMS was used for the high-efficient oil/water separation. Briefly, this work provides a novel and feasible strategy for creating unpredictable surface hydrophobicity with self-healing performance by chitosan and tannic acid, inspiring more scholars to fabricate hydrophobic surface by hydrophilic materials. 

Superhydrophobic, photothermal, and UV-resistant coatings obtained by polydimethylsiloxane treating self-healing hydrophobic chitosan-tannic acid surface for oil/water separation

Sputter-deposited nickel nanoparticles on Kevlar fabrics with laser-induced graphene for efficient solar evaporation

Reducing carbon emissions from building materials production and operation would have a huge impact on the global energy and environment. Wood presents great potential as an environment-friendly building material due to its relatively low carbon emission and cost. However, several issues, including the mechanical anisotropic, extremely low optical transparency, and single function, greatly hinder the further application of wood as a building material. Herein, hybrid wood-derived laminates were dedicatedly fabricated through top-down strategy using bulk wood as raw materials. The obtained hybrid laminates demonstrate low anisotropic mechanical factor of 1.14, which was only one-eighth of the corresponding value of natural wood (8.07). Besides, such wood laminates exhibit moderate light permeability (35% of transmittance), which could provide with softening of glare and uniform illumination, thereby reducing the power consumption. Also, the remaining wood cellulose and incorporated inorganic microspheres in our laminates backscatter solar radiation and emit thermal, resulting in continuous cooling with a dT of 12 °C under one solar intensity irradiation. Combined with excellent water stability and self-cleaning property, our laminates are expected to be used as the building blocks for the construction of energy-efficient buildings with low carbon emission. 

Processing bulk wood into a light-permeable passive radiative cooling material for energy-efficient building

Personal thermal management textiles that put focus on cooling human body in hot environment attracts intense research interests since the urgent requirement for adjusting human activity to save energy even when we face extreme weather more frequently. Textiles produced from petrol-based fibers have shown their effective passive cooling effects. However, regeneratable passive cooling textiles are still lacking. In this study, we report a cotton-based effective passive cooling textile by interfacial engineering by alginate modification and in-situ generated CaCO3 particles. The Alg/CaCO3-cotton fabrics not only effectively cool the underlining surface via high reflectivity over solar spectra (∼90%) and high mid-infrared emissivity (0.97) in the atmospheric window, but also present enhanced water evaporation and water vapor permeation capabilities (36.51% higher water vapor transmission rate than pristine cotton fabric). The textile avoids overheating by 5.4 °C under direct solar irradiation, comparable to the performance of the reported petrol-based textile. The Alg/CaCO3-cotton also presents high washing stability, UV protection properties, faster drying and fire resistance properties. The surface engineering process is compatible with large-scale production. This work provides enlightening insights to regeneratable and wearable passive cooling materials and sheds light on the working mechanism of personal thermal management materials. 

Rendering passive radiative cooling capability to cotton textile by an alginate/CaCO3 coating via synergistic light manipulation and high water permeation

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Rendering passive radiative cooling capability to cotton textile by an alginate/CaCO3 coating via synergistic light manipulation and high water permeation