A Novel BST@TPU Membrane with Superior UV Durability for Highly Efficient Daytime Radiative Cooling

Abstract

Passive radiative cooling technologies play an integral role in advancing sustainable development. While the potential of polymer‐based radiative cooling materials is increasingly recognized, they often degrade under prolonged ultraviolet (UV) radiation exposure, which undermines both their mechanical and radiative cooling performance. To address this challenge, a coaxial electrospinning method to prepare a BST@TPU membrane, with a core layer of strontium barium titanate nanorods (BST NRs) and a shell layer of thermoplastic polyurethane (TPU) is employed. Capitalizing on the UV absorption and free radical adsorption properties of BST NRs, the UV stability of the TPU membrane is significantly increased. Additionally, the inclusion of high refractive index BST NRs compensates for the decrease in reflectivity caused by their UV absorption. After 216 h of continuous 0.7 kW m−2 UV irradiation, the BST@TPU membrane, which initially exhibits a reflectance of 97.2%, demonstrated a modest decline to 92.1%. Its net radiative cooling power maintains 85.78 W m−2 from the initial of 125.21 W m−2, extending the useful lifetime of the TPU membrane threefold. This innovation extends promise for enhancing the efficiency and durability of radiative cooling materials, contributing to sustainable cooling solutions across various applications.

Synchronous Radiative Cooling and Thermal Insulation in SiO2/Poly(vinyl alcohol) Composite Aerogel for Energy Savings in Building Thermal Management

“…The heat conduction and heat convection from ambient radiation ( P ( cond + conv ) ) is P false( c o n d + c o n v false) false( T , T a m b false) = h c c false( T a m b − T false) where A is the nonradiative heat transfer coefficient, with typical values in the range 0–12 W/m 2 . , …”

“…The heat conduction and heat convection from ambient radiation ( P ( cond + conv ) ) is where A is the nonradiative heat transfer coefficient, with typical values in the range 0–12 W/m 2 . , …”

“…where A is the nonradiative heat transfer coefficient, with typical values in the range 0−12 W/m 2 . 45,46 Building Energy Simulation with Energy Plus. In order to study the potential benefits of composite aerogel as a building envelope material, Energy Plus was used to simulate the changes in energy demand for cooling and heating the building throughout the year for different modes of building materials.…”

Electrospun organic/inorganic hybrid nanofibers for accelerating wound healing: a review

“…12–14 Moreover, the nano-network structure of electrospun nanofibrous membranes closely resembles the natural extracellular matrix (ECM) of skin, making them promising candidates for wound treatment. 15–17 Additionally, electrospinning has evolved from single-fluid 18,19 to side-by-side 20,21 or coaxial, 22,23 triaxial 24,25 or even other multi-fluid derived structures including core–shell, 22 porous, 26 Janus 27,28 and even more complex and fine structures. 29,30 This offers a straightforward and practical method for utilizing a wide range of raw or modified materials, providing control over the nanofiber morphology and structure.…”

Radiative Cooling Potential of a Water-Based Paint Formulation under Realistic Application Conditions

“…Similar solar reflectance values are reported in the literature for PRC materials with contrasting results. It can be expected that higher values are required to achieve a net cooling effect during daytime hours, − even though sub-ambient cooling measurements have also been reported for materials around 90%. As we discuss in this work, these discrepancies may be attributed to two main factors: an overestimation of the ambient temperature (which should be always measured outside of the sample measurement box) and measurement of spectral values not properly normalized against calibrated standards …”