COVID-19 is still prevalent around the globe. Although some SARS-CoV-2 vaccines have been distributed to the population, the shortcomings of vaccines and the continuous emergence of SARS-CoV-2 mutant virus strains are a cause for concern. Thus, it is vital to continue to improve vaccines and vaccine delivery methods. One option is nasal vaccination, which is more convenient than injections and does not require a syringe. Additionally, stronger mucosal immunity is produced under nasal vaccination. The easy accessibility of the intranasal route is more advantageous than injection in the context of the COVID-19 pandemic. Nanoparticles have been proven to be suitable delivery vehicles and adjuvants, and different NPs have different advantages. The shortcomings of the SARS-CoV-2 vaccine may be compensated by selecting or modifying different nanoparticles. It travels along the digestive tract to the intestine, where it is presented by GALT, tissue-resident immune cells, and gastrointestinal lymph nodes. Nasal nanovaccines are easy to use, safe, multifunctional, and can be distributed quickly, demonstrating strong prospects as a vaccination method for SARS-CoV-2, SARS-CoV-2 variants, or SARS-CoV-n.
Rare-earth metal cations have been used rarely as Lewis-acidic components in the chemistry of frustrated Lewis pairs (FLPs). Herein, we report the first cerium/phosphoruss ystem (2)e mploying ah eptadentate N 4 P 3 ligand, which exhibits triple FLP-type reactivity towards as eries of organic substrates,i ncluding isocyanates,i sothiocyanates, diazomethane, and azides on as ingle rare-earth Lewis acidic Ce center. This result shows that the Ce center and three Pa toms in 2 coulds imultaneouslya ctivate three equivalents of small molecules under mild conditions.T his study broadens the diversity of FLPs and demonstrates that rare earth based FLP exhibit unique properties compared with otherFLP systems. Figure 5. Molecular structures of complexes 5, 6,a nd 7 (drawnw ith 50 % probability). Hydrogen atoms and isopropyl moieties in the PiPr 2 were omitted for clarity.Selected bondl engths ()f or 5:
1D/2D heterostructures, in particular those that consist of a 1D nanorod core and a 2D nanoplate (NPL) shell, enable the combination of the merits and mitigation of the demerits of distinct dimensionalities into one system, providing a new platform to study their intriguing properties. However, there is still lack of effective strategies to rationally integrate the components with different dimensionalities together. Here, we report a general seeded growth method for the construction of epitaxial 1D/2D heterostructures with a variety of compositional combinations, in which ordered 2D NPL arrays are vertically grown along the c-axis of 1D wurtzite nanomaterials, including II− VI and I−III−VI 2 semiconductors. The loading densities of NPLs on the 1D nanomaterials are very high, up to 280 piece/μm. The same crystal structure of the grown NPLs and 1D seeds ensures the epitaxial growth relationship between these two materials. It is found that the secondary 2D growth mode is a kinetic-dominated process, in addition to the effect of the anionic sulfur precursor. The as-prepared 1D/2D CdSe/CdS heterostructures exhibit enhanced activity for photocatalytic hydrogen evolution compared to that of the single-component CdSe NRs and CdS/CdS homostructures. This work greatly enriches the variety and architecture of the available heterostructures and also provides a toolbox for exploring their promising applications.
Comprehensive Summary The strong oxophilicity of actinide complexes prevents their applications in the transformation of oxygen‐containing substrates. Herein, we report the use of a uranium(IV) alkyl complex as a catalyst for the hydroboration of carbonyl compounds. This reaction has good functional group tolerance and chemo‐selectivity under mild conditions. This study represents the rare example of catalytic reaction promoted by a uranium alkyl complex and highlights the potential of uranium complexes in synthetic chemistry.
Ternary metal sulfide emerged as an important semiconductor for optoelectronic and photocatalytic applications. However, controlled synthesis of ultrathin ternary metal sulfide nanoplates is still difficult due to the lack of strategies to fulfill the anisotropic growth. Here, we report a wet-chemistry method for the preparation of ultrathin indium-based ternary metal sulfide (MIn 2 S 4 , M = Zn, Cd, and Ni) nanoplates with thickness within 2 nm, in which the as-grown β-In 2 S 3 nanoplates are used as templates. As a proof of concept, the photocatalytic hydrogen evolution of ZnIn 2 S 4 nanoplates is performed, which shows a remarkable photocatalytic performance under the irradiation of simulated sunlight. After loading of Ni nanoparticles as cocatalysts, it is found that the 3.0 wt % Ni/ZnIn 2 S 4 photocatalysts exhibit the best performance for hydrogen generation with a rate of 19.9 mmol•g −1 •h −1 , which is 6 times larger than that of ZnIn 2 S 4 nanoplates. The present work provides a method for the development of high-quality ultrathin multinary sulfide nanoplates.
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