A Shish-Kebab Superstructure Film for Personal Radiative Cooling

Abstract

Due to global warming and the energy crisis, incorporating passive radiative cooling into personal thermal management has attracted extensive attention. However, developing a wearable textile that reflects incoming sunlight and allows mid-infrared radiation transmission is still a tough challenge. Herein, a shish-kebab superstructure film was produced via a flow-induced crystallization strategy for personal radiative cooling. The resulting film endowed a high infrared transmittance (87%) and improved sunlight reflectivity (83%). A device was developed to simulate the human body skin, and the temperatures of the shish-kebab film were 2.5 and 2.6 °C lower than that of traditional textile in outdoor and indoor tests, respectively. In order to make the shish-kebab film more wearable, a series of modifications were then carried out. This study demonstrates the substantial potential to personal thermal management textiles.

Ag Nanoparticles-Coated Shish-Kebab Superstructure Film for Wearable Heater

“…The SEM image in Figure a illustrates the shish-kebab superstructure of the SKF. The distribution of SKF skewer diameters, as depicted in Figure S2a, indicates that they range from 0.5 to 1 μm, with a majority falling within the range of 0.65 to 0.85 μm, which can strongly scatter visible light . From Figure b,c, it is apparent that the PDA and AgNPs have dispersed over the surface of the SKF and joined into a network.…”

“…The SKF was fabricated according to our previous work . The modified SKF was prepared using the following procedure.…”

“…Maintaining a consistent body temperature is of utmost importance for the well-being and health of individuals, as it directly influences their thermophysiological comfort. − The majority of modern heating techniques, however, are inefficient, wasteful, and unable to handle the complexity and variety of the environment. − Compared to traditional methods that rely on convection and conduction with the external atmosphere (by raising the ambient temperature to raise the human body temperature), directly targeting the human body for warming can significantly reduce the amount of energy wasted in maintaining the ambient temperature, resulting in efficient use of energy. − Thus, it is essential to develop materials and systems that can precisely heat the human body with less energy so as to alleviate the energy crisis and global warming.…”

“…Polyethylene is frequently utilized in the manufacturing of cooling materials due to its excellent infrared transmission qualities. ,− In our previous work, we prepared a shish-kebab superstructure film (SKF), which, due to the specificity of the structure, has an extremely strong scattering effect on visible light, giving SKFs the ability to provide passive radiative cooling. In order to expand the functionality of SKF, a series of modifications were made, hoping that it could be used as an all-weather heating and thermal management material.…”

Highly Stable Polyimide Composite Nanofiber Membranes with Spectrally Selective for Passive Daytime Radiative Cooling

“…Among various passive radiative cooling materials, several sophisticated designs such as nanophotonic structures, structural polymers, thin-film multilayer structures, and double-layer nanoparticle-based coatings have been reported in these fields. Polymeric materials exhibit various advantages such as excellent mechanical strength and ease of processing for radiative cooling. − Especially, thin-film multilayer structures represented by polymeric nanofiber membranes via the electrospinning method have been widely researched, due to their low cost, simple operation, and wide applicability. , Nanofiber membranes including poly­(ethylene oxide) (PEO), poly­(vinyl alcohol) (PVA), polyvinylidene fluoride, and cellulose acetate membranes have high sunlight reflection induced by their highly disordered structure and high mid-infrared (MIR) emissivity originated from its vibrations of their functional groups (C–O, C–F, C–N, C–O–C, and Si–O–Si) among the fingerprint region (6.7–16.7 μm) attributed to the atmospheric window.…”