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Stacking Engineering toward Giant Second Harmonic Generation in Twisted Graphene Superstructures.
J Am Chem Soc
December 2024
Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
The nonlinear optical response in graphene is finding increasing applications in nanophotonic devices. The activation and enhancement of second harmonic generation (SHG) in graphene, which is generally forbidden in monolayer and AB-stacked bilayer graphene due to their centrosymmetry, is of urgent need for nanophotonic applications. Here, we present a comprehensive study of SHG performance of twisted multilayer graphene structures based on stacking engineering.
View Article and Find Full Text PDFPhytotoxicity Study of (Amino)imidazo[1,2-]pyridine Derivatives Toward the Control of , , and Weeds.
J Agric Food Chem
December 2024
Instituto de Química, Laboratório de Química Metodológica e Orgânica Sintética (LaQMOS), Universidade de Brasília, 70904-970 Brasília, DF, Brazil.
In this work, several imidazo[1,2-]pyridines were synthesized through the Groebke-Blackburn-Bienaymé three-component reaction (GBB-3CR), and their phytotoxicity was evaluated by the influence on the growth of wheat coleoptiles and three important agricultural seeds (, , and ) at test concentrations of 1000, 300, 100, 30, and 10 μM. A structure-activity relationship was established, showing the importance of halogen groups at the position of the attached aromatic ring and the presence of a cyclohexylamine group for greater activity. Post-modification of some GBB-3CR adducts was carried out, leading to imidazo[1,2-]pyridine-tetrazole hybrids, which were also evaluated in these bioassays.
View Article and Find Full Text PDFSize-adjustable High-Entropy Alloy Nanoparticles as an Efficient Platform for Electrocatalysis.
Angew Chem Int Ed Engl
December 2024
Shenzhen University, Chemistry, Nanhai Ave 3688, 518060, Shenzhen, CHINA.
The high entropy alloy (HEA) possesses distinctive thermal stability and electronic characteristics, which exhibits substantial potential for diverse applications in electrocatalytic reactions. However, accurately controlling the size of HEA still remains a challenge, especially for the ultrasmall HEA nanoparticles. Herein, we firstly calculate and illustrate the size impact on the electronic structure of HEA and the adsorption energies of crucial intermediates in typical electrocatalytic reactions, such as the hydrogen evolution reaction (HER), oxygen reduction reaction (ORR), CO2 electroreduction (CO2RR) and NO3- electroreduction (NO3RR).
View Article and Find Full Text PDFAba-induced active stomatal closure in bulb scales of Lanzhou lily.
Plant Signal Behav
December 2025
State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, College of Ecology, Lanzhou University, Lanzhou, Gansu, China.
Abscisic acid (ABA) mediated stomatal closure is a highly effective mode of active stomatal regulation under drought stress. Previous studies on stomatal regulation have primarily focused on the leaves of vascular plants, while research on the stomatal behavior of bulbous plants remains unknown. In addition, ABA-induced stomatal regulation in bulbs has yet to be explored.
View Article and Find Full Text PDFExtraction and biological activities of polysaccharides and saponins from : a review.
Nat Prod Res
December 2024
School of Food Sciences and Engineering, Changchun University, Changchun, China.
(), a perennial woody plant of the Araliaceae family, is extensive in Northeast China. Esteemed for both its medicinal and edible qualities in the Changbai Mountain region, its primary components include polysaccharides, saponins, and flavonoids. displays numerous pharmacological effects, such as cardiovascular protection, anti-tumour, anti-fatigue, and hypoglycaemic properties.
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