Latest ArticlesFunctional carbon nanomaterials have become the stars of many active research fields, such as electronics, energy, catalysis, imaging, sensing and biomedicine. Herein, a facile and one-pot strategy for generating ferromagnetic nanoparticles loaded on N-doped carbon nanosheets (Fe-N-CNS) is presented by salt-assisted high-temperature carbonization of natural silk proteins. Due to their graphitic structures, N-doping and ferromagnetic nanoparticles (FeNx, FeOy, FeCz), the silk-derived Fe-N-CNS can act as excellent mimics of both peroxidase and oxidase. Benefiting from the combined character of the graphene-like structures and enzyme-like activities, Fe-N-CNS can be further applied to highly efficient dye removal via synergistic adsorption and degradation. Meanwhile, the as-prepared Fe-N-CNS with intrinsic magnetism and electrical conductivity can also serve as an efficient electromagnetic wave absorption agent. The broadest effective absorption bandwidth (EAB) of as-obtained absorbing material yields a 6.73 GHz with 1 mm thickness, with a maximum reflection loss of −37.33 dB (11.41 GHz). The EAB can cover 2~18 GHz with a tunable absorber thickness from 1.0 mm to 5.0 mm. Collectively, Fe-N-CNS, as a dual-functional material, can tackle the aggravating environmental pollution issues of both dyes and electromagnetic waves.
Multifunctional switchable materials are attracting tremendous interest because of their great application potential in signal processing, information encryption, and smart devices. Here, we reported an organic-inorganic hybrid thermochromic ferroelastic crystal, [TMIm][CuCl4] (TMIm = 1,1,3,3-tetramethylimidazolidinium), which undergoes two reversible phase transitions at 333 K and 419 K, respectively. Intriguingly, these three phases experience a remarkable ferroelastic-paraelastic-ferroelastic (2/m-mmm-2/m) transition, which remains relatively unexplored in ferroelastics. Moreover, the ferroelastic domains can be simultaneously switched under temperature and stress stimuli. Meanwhile, [TMIm][CuCl4] exhibits thermochromic phenomenon, endowing it with extra spectral encryption possibilities during information processing. Combined with dielectric switching behavior, [TMIm][CuCl4] are promising for practical applications in memory devices, next-generation sensors, and encryption technology.
We report here a generic, green synthesis of 17 valuable syn-aryl-(2S,3R)-2–chloro-3–hydroxy esters (syn-(2S,3R)-1) in 73%-99% isolated yields along with 6.1:1–83:1 dr and 31%~ > 99% ee, through dynamic reductive kinetic resolution of racemic aryl α–chloro β-keto esters (2) catalyzed by an engineered ketoreductase which was obtained via epPCR-based directed evolution. The hectogram scale synthesis of syn-(2S,3R)-1b at a substrate concentration of 120 g/L showcased the application potential of the biocatalytic method developed presently.
Glycolysis inhibition can effectively block the energy supply and interrupt tumorigenesis in many types of cancers. However, when glycolysis is inhibited, tumor cells will break down glutamine as the raw material for the replenishment pathway to maintain the tricarboxylic acid cycle ensuring energy supply, therefore inducing ineffective interruption of metabolic. Herein, we designed glutamine transporter antagonist l-γ-glutamyl-p-nitroanilide (GPNA) loaded and 4T1 cancer cell membrane coated iridium oxide nanoparticles (IrO2-GPNA@CCM) to realize a comprehensive inhibition of tumor energy supply which synergistically mediated by glycolysis and glutamine cycle. IrO2 NPs were used to catalyze the O2 generation by facilitating the decomposition of endogenous H2O2 in tumor cells, which further downregulated the expression of HIF-1α and PI3K/pAKT to interrupt the generation of lactate. Meanwhile, the loaded GPNA was released under NIR irradiation to bind to alanine-serine-cysteine transporter (ASCT2) for glutamine uptake suppression, therefore realizing the comprehensive dysfunction of cell metabolism. Moreover, both in vitro and in vivo results convinced the thorough energy inhibition effect based on IrO2-GPNA@CCM NPs, which provided an inspiring strategy for future construction of tumor therapeutic regimen.
Metal-support interaction (MSI) is an efficient way in heterogeneous catalysis and electrocatalysis to modulate the electronic structure of metal for enhanced catalytic activity. However, there are still great challenges in promoting the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) simultaneously by this way. Herein, Fe-doped Co3O4 supported Ru (Ru/FeCo) catalysts are synthesized by MSI strategies to further improve the electrocatalytic activity and stability of the catalysts. The results show that the optimized Ru/FeCo catalyst exhibits the best catalytic performance. The HER and OER tests at 10 mA/cm2 in 1 mol/L KOH solution show excellent overpotentials of 155 mV and 283 mV, respectively. The activity and stability enhancement can be attributed to the MSI that effectively modify the electronic structure and improve interfacial electron transfer between Ru and Fe-doped Co3O4 (FeCo). This work provides an innovative direction for the design of high-efficiency bifunctional electrocatalysts by virtue of the MSI.
Hydrocarbons are promising products for CO2 electroreduction (CRR) while is impeded by the low selectivity. Turning the curvature of the active site is an effective strategy to change the adsorption properties and further regulate the product distribution and reactivity. Herein, we have designed a novel V single atom catalyst (SAC) based on rolled two-dimensional (2D) BC3N2 substrate with different curvatures. The results have demonstrated that increased curvature can enhance the adsorption strength of CRR intermediates, which follows different mechanisms for systems with low and high curvature. This character eventually leads to the deviation away from the scaling line between Ead[CO]~Ead[COOH] based on transition metals for V@2D-BC3N2 systems. 3-3 system is screened as the optimal candidate for hydrocarbons production due to the enhanced binding ability of adsorbates, which can increase the reactivity for hydrocarbons production and hinder the production of H2 and HCOOH simultaneously.
The unique structural features represented by micro-nanoneedle tip structure reflect wonderful physical and chemical properties. The tip effect includes the concentration of energy such as electrons, photons and magnetism in the tip region, which has promising applications in the fields of energy conversion, water capture, environmental restoration and so on. In this review, a comprehensive and systematic summary of the latest advances in the application of the tip effect in different fields is provided. Utilizing advanced Finite Difference Time Domain simulation, we further propose our understanding of the fundamental mechanism of the tip effect induced by micro-nanostructure. However, we need to forge the present study to further reveal the essential law of the tip effect from the perspective of theoretical calculations. This review would provide a solid foundation for further development and application of the tip effect.
Among the emitters in powder dusting to visualize the latent fingerprints (LFPs), aggregation-induced emission luminogens (AIEgens) are well employed for their high brightness and resistance to photo-bleaching. However, the serious background interference and low resolution still limit their fast development. Therefore, to further enhance the signal-to-noise ratio in LFPs imaging, especially to improve the analysis for level 3 details, donor-acceptor (D-A) typed AIEgens of DTPA-2,3-P, DTPA-2,5-P and DTPA-2,6-P are designed here. It is observed that strong emission covering from 450 nm to 650 nm can be obtained for all these molecules, especially that a high PLQY value of 10.06% in solids is achieved in DTPA-2,3-P. This is much higher than that of the other two cases (0.80% and 0.51%). By utilizing the DTPA-2,3-P in powder dusting, fluorescence imaging of LFPs can be clearly captured on both smooth and rough substrates. Moreover, confocal laser scanning microscope (CLSM) enables us to achieve high-resolution LFPs imaging in both 2D and 3D views, providing more detailed information of fingerprints pores in width, distance, distribution, and shapes. The results here demonstrate that highly emissive AIEgen of DTPA-2,3-P could be an excellent candidate for the visualization of fingerprints, thus providing the potential application in criminal investigation in the future.
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