Passive radiative cooling technology serves as an energy-free alternative to traditional cooling systems. Porous polymer structures are frequently employed for radiative cooling by leveraging the refractive index mismatch between the polymer and the pores, enabling the scattering of incoming sunlight. Recently, water-soluble and readily available Sodium chloride (NaCl) particles have been utilized as sacrificial templates for sustainable pore creation. Nevertheless, optimizing NaCl particle size, and thus the polymer pore size to enhance scattering capabilities remains a challenge. Here, we report a simple, scalable, and sustainable approach to creating an optimized porous polydimethylsiloxane (PDMS) film. This approach utilizes ultrafine NaCl powders as sacrificial templates, which were synthesized via ultrasonic precipitation to ensure their small size. The ultrafine NaCl particles have a size distribution centered around 6-8 μm, and the as-fabricated porous PDMS film achieves a high thermal emissivity of 0.95 within the atmospheric window (8-13 μm) and exhibits a reflectivity of 0.95 within the visible range (0.4-0.78 μm). Due to the desired dual-spectrum properties, the porous PDMS film exhibits a superior subambient cooling capacity over that fabricated with typically larger NaCl particles under strong sunlight. This study offers a scalable and practical radiative cooling solution for sustainable thermal management.
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http://dx.doi.org/10.1021/acsomega.4c08275 | DOI Listing |
ACS Omega
January 2025
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
Passive radiative cooling technology serves as an energy-free alternative to traditional cooling systems. Porous polymer structures are frequently employed for radiative cooling by leveraging the refractive index mismatch between the polymer and the pores, enabling the scattering of incoming sunlight. Recently, water-soluble and readily available Sodium chloride (NaCl) particles have been utilized as sacrificial templates for sustainable pore creation.
View Article and Find Full Text PDFMar Pollut Bull
January 2025
Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, PR China; Dalian Key Laboratory of Internal Combustion Engine Tribology and Reliability Engineering, Dalian 116026, PR China. Electronic address:
As a global challenge, marine biofouling is causing serious economic losses and adverse ecological impacts. In recent years, a variety of promising and environmentally friendly anti-fouling strategies have emerged, among which the excellent anti-fouling performance of bionic autocrine coatings has been recognized. However, bionic autocrine coatings still suffer from uncontrollable secretion behavior, poor mechanical stability, and poor abrasion resistance.
View Article and Find Full Text PDFLangmuir
January 2025
Materials Chemistry Centre, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
Durable and fluorine-free superhydrophobic films were fabricated by a simple two-step process involving the pretreatment of glass substrates with an epoxysilane, which acted as an adhesive. The next step involved the aerosol-assisted chemical vapor deposition of a simple mixture of polydimethylsiloxane (PDMS) and SiO nanoparticles (NPs). Various parameters were studied, such as deposition time as well as PDMS and SiO loadings.
View Article and Find Full Text PDFInorg Chem
January 2025
Department of Chemistry, Beijing Technology and Business University, Beijing 100048, China.
Isostructured lanthanide-Brønsted acidic ionic liquid coordination polymers, {[Ln(CHNO)(HO)]Cl} (LnIMDC(HO), Ln = Eu, Gd, or Tb, CHNO = [IMDC]) and {[EuTb(CHNO)(HO)]Cl} (EuTbIMDC(HO))), have been synthesized using 1,3-bis(carboxymethyl) imidazolium chloride ([HIMDC]Cl) as linkers. LnIMDC(HO) (Ln = Eu or Tb) and EuTbIMDC(HO) exhibit good temperature sensing performance over a wide temperature range with maximum sensitivities of 2.73%·K (392 K) and 2.
View Article and Find Full Text PDFACS Mater Au
January 2025
Christian Doppler Laboratory for Soft Structures for Vibration Isolation and Impact Protection (ADAPT), School of Education, STEM Education, Johannes Kepler University Linz, 4040 Linz, Austria.
Soft materials play a pivotal role in the efficacy of stretchable electronics and soft robotics, and the interface between the soft devices and rigid counterparts is especially crucial to the overall performance. Herein, we develop polyimide-polydimethylsiloxane (PI-PDMS) copolymers that, in various ratios, combine on a molecular level to give a series of chemically similar materials with an extremely wide Young's modulus range starting from soft 2 MPa and transitioning to rigid polymers with up to 1500 MPa. Of particular significance is the copolymers' capacity to prepare seamless stiffness gradients, as evidenced by strain distribution analyses of gradient materials, due to them being unified on a molecular level.
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