A sensitive amine‐responsive disassembly of self‐assembled Au I ‐Cu I double salts was observed and its utilization for the synergistic catalysis was enlightened. Investigation of the disassembly of [Au(NHC) 2 ][Cu...
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A sensitive amine‐responsive disassembly of self‐assembled Au I ‐Cu I double salts was observed and its utilization for the synergistic catalysis was enlightened. Investigation of the disassembly of [Au(NHC) 2 ][CuI 2 ] revealed the contribution of Cu‐assisted ligand exchange of N‐heterocyclic carbene (NHC) by amine in [Au(NHC) 2 ] + and the capacity of [CuI 2 ] − on the oxidative step. By integrating the implicative information coded in the responsive behavior and inherent catalytic functions of d 10 metal complexes, a catalyst for the oxidative carbonylation of amines was developed. The advantages of this method were clearly reflected on mild reaction conditions and the significantly expanded scope (51 examples); both primary and steric secondary amines can be employed as substrates. The cooperative reactivity from Au and Cu centers, as an indispensable prerequisite for the excellent catalytic performance, was validated in the synthesis of (un)symmetric ureas and carbamates.
The process of wound healing is sensitive to various factors of the local environment, including temperature, humidity and sterility. However, due to lack of efficient thermal regulation in existing wound dressings, t...
The process of wound healing is sensitive to various factors of the local environment, including temperature, humidity and sterility. However, due to lack of efficient thermal regulation in existing wound dressings, the perturbed local environment and oxidative stress caused by an increased wound temperature under outdoor sunlight inevitably impacts wound healing. Here we demonstrate a daytime radiative cooling dressing based on a polyamide 6/silk fibroin bilayer that reduces the thermal load for skin wounds under sunlight illumination. The mid-infrared transparent polyamide 6 and the biocompatible silk fibroin together endow a high mid-infrared emissivity (~0.94) and sunlight reflectivity (~0.96), thus achieving a temperature of ~7 °C below ambient under direct sunlight. When used for repairing mouse skin full-thickness injuries under sunlight, we observed an accelerated wound healing rate compared with that of commercial dressings. This work therefore offers a promising strategy for passive temperature regulation to accelerate wound healing under sunlight.
Zeolites are becoming more versatile in their chemical functions through rational design of their frameworks. Therefore, direct imaging of all atoms at the atomic scale, basic units (Si, Al, and O), heteroatoms in the...
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Bioinspired dynamic structural color has great potential for use in dynamic displays, sensors, cryptography, and camouflage. However, it is quite rare for artificial structural color devices to withstand thousands of ...
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Bioinspired dynamic structural color has great potential for use in dynamic displays, sensors, cryptography, and camouflage. However, it is quite rare for artificial structural color devices to withstand thousands of cycles. Male hummingbird's crowns and gorgets are brightly colored, demonstrating frequent color switching that is induced by regulating the orientation of the feathers through movement of skin or joints. Inspired by this unique structural color modulation, we demonstrate a flexible, mechanically triggered color switchable sheet based on a photonic crystal (PhC)-coated polydimethylsiloxane (PDMS) kirigami (PhC-PDMS kirigami) made by laser cutting. Finite element modeling (FEM) simulation reveals that the thickness of PDMS kirigami and the chamfer at the incision induced by laser cutting both dominate the out-of-plane deformation through in-plane stretching. The bioinspired PhC-PDMS kirigami shows precisely programmable structural color and keeps the color very well after recycling over 10 000 times. This bioinspired PhC-PDMS kirigami also shows excellent viewability even in bright sunlight, high readability, robust functionality, technical flexibility, and mechanical durability, which are readily exploitable for applications, such as chromic mechanical monitors for the sports industry or for medical applications, wearable camouflage, and security systems.
A photocharge/discharge strategy is proposed to initiate the WO 3 photoelectrode and suppress the main charge recombination, which remarkably improves the photoelectrochemical (PEC) performance. The photocharged WO 3 ...
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A photocharge/discharge strategy is proposed to initiate the WO 3 photoelectrode and suppress the main charge recombination, which remarkably improves the photoelectrochemical (PEC) performance. The photocharged WO 3 surrounded by a 8–10 nm overlayer and oxygen vacancies could be operated more than 25 cycles with 50 h durability without significant decay on PEC activity. A photocharged WO 3 /CuO photoanode exhibits an outstanding photocurrent of 3.2 mA cm −2 at 1.23 V RHE with a low onset potential of 0.6 V RHE , which is one of the best performances of p-n heterojunction structure. Using nonadiabatic molecular dynamics combined with time-domain DFT, we clarify the prolonged charge carrier lifetime of photocharged WO 3 , as well as how electronic systems of photocharged WO 3 /CuO semiconductors enable the effective photoinduced electrons transfer from WO 3 into CuO. This work provides a feasible route to address excessive defects existed in photoelectrodes without causing extra recombination.
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