The development of well-adhering, easily producible photonic reflective coatings is still a challenge. Here, an easy-to-produce, industrial viable process is reported that uses a primer layer of the so-called type II photoinitiator to obtain an excellent adhesion between a plastic substrate and one-dimensional (1D) photonic liquid crystalline coatings. Furthermore, a good alignment of the reactive cholesteric liquid crystal mixture is obtained using a bar-coating process, without alignment layers or surfactants. After photopolymerization, cross-hatch tape tests show a good adhesion of the photonic coating having a reflection band of 50% transmission with almost no scattering. Additionally, we demonstrate the ability to create well-adhering ∼100% reflective coatings by coating double layers and the ability to create single-layered cholesteric broadband reflectors using solely a reactivity gradient created by the primer layer. Our new interfacial method gives new opportunities to use reflecting 1D photonic coatings in industrial processes and applications and allows the bonding of almost any polymer to a plastic substrate.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6128616 | PMC |
http://dx.doi.org/10.1021/acsami.8b11583 | DOI Listing |
Sensors (Basel)
January 2025
School of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, China.
Refractive index (RI) and temperature (T) are both critical environmental parameters for environmental monitoring, food production, and medical testing. The paper develops a D-shaped photonic crystal fiber (PCF) sensor to measure RI and T simultaneously. Its cross-sectional structure encompasses a hexagonal-hole lattice, with one hole selectively filled with toluene for temperature sensing.
View Article and Find Full Text PDFLangmuir
January 2025
Center of Eco-Material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China.
The adhesion of raindrops on car rearview mirrors poses a significant threat to traffic safety due to the resulting blurred vision. Transparent superhydrophobic coatings have emerged as a potential solution to this problem. However, the development of transparent superhydrophobic coatings is often hampered by complex preparation procedures, high costs, and limited substrate compatibility, rendering them unsuitable for practical applications.
View Article and Find Full Text PDFLangmuir
January 2025
State Key Laboratory of Transvascular Implantation Devices, The Second Affiliated Hospital, School of Medicine, Zhejiang University, 88 Jiefang Road, Hangzhou 310009, P. R. China.
Implantable cardiovascular devices have revolutionized the treatment of cardiovascular diseases, yet their long-term functionality without causing thrombosis is a persistent challenge. Although the surface modification of anticoagulant coating has greatly improved the biocompatibility of the devices, its long-term stability in complex physiological environments still remains questionable. Herein, the stability of three anticoagulant hydrogel coatings, poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC), poly(sodium 2-acryloyl-2-methylpropanesulfonate) (PAMPS), and poly(4-styrenesulfonate sodium) (PSS), is studied.
View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2025
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Radiative cooling is an excellent strategy for mitigating global warming, by enhancing heat fluxes away from the Earth, thus balancing the Earth's heat flow. However, for randomly particle-dispersed radiative cooling materials, the particle content as high as 94-96 wt % or 60 vol %, far exceeds the critical pigment percentage (40-50%) of traditional coatings, preventing its large-scale application. Here, inspired by particle deposition under gravity in solution, we demonstrate an auto-deposited SiO composite radiative cooling coating (ADRC) which reduces the amounts of particles required and lowers costs.
View Article and Find Full Text PDFAssay Drug Dev Technol
January 2025
Institute of Pharmaceutical Research, GLA University, Mathura, India.
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