Article
Chemistry, Physical
Zemin Sun, Mengwei Yuan, Han Yang, Liu Lin, Genban Sun, Xiaojing Yang
Summary: Non-metal carbon materials are widely used in electrocatalytic reactions due to their property advantages, with the defective structure significantly affecting physicochemical properties. A graphene structural model was constructed to study the electronic characteristics of vacancy defect sites and molecular interactions during adsorption. The findings provide insights into the catalytic behavior of carbon materials.
APPLIED SURFACE SCIENCE
(2021)
Article
Energy & Fuels
Brandon Lu, Amir Zanj
Summary: Vertical Axis Wind Turbine (VAWT) technology has the potential to disrupt the wind energy industry, but its promised performance has not been achieved due to system design issues. This study develops a physics-based, interrelated multi-domain dynamic model to help designers reveal VAWTs' technological potential and optimize system design. The developed parametric tool shows high accuracy and robustness, and sensitivity analyses indicate the significant impact of component interaction on system performance if neglected.
Article
Chemistry, Multidisciplinary
Chenting Yan, Rei Kinjo
Summary: The [1+2] cycloaddition reaction between a cyclic (alkyl)-(amino)aluminyl anion and diaryldiazomethane results in the formation of an AlN2 three-membered ring species, which shows interesting reactivity and properties.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Electrical & Electronic
Jianjun Li, Yicheng Deng, Xuefeng Wang, Hang Lu, Yuanxing Liu
Summary: A miniature wide-range three-axis vector atomic magnetometer has been developed under the spin-exchange relaxation-free regime, achieving high sensitivity and wide range of response by suppressing spin-exchange relaxation in zero field.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Lars Rummel, Jan M. Schuemann, Peter R. Schreiner
Summary: The computational analysis focused on hexaphenylethane derivatives with heavier tetrels comprising the central bond. The study found that London dispersion interactions are the decisive factor for the molecular stability of the heavier tetrel derivatives. The longer central bonds in these derivatives move the phenyl groups out of the heavily repulsive regime, allowing them to optimally benefit from London dispersion interactions.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Astronomy & Astrophysics
Erhan Guler
Summary: This paper discusses the generalized helical hypersurfaces with a time-like axis in Minkowski spacetime E-1(4). The first and second fundamental form matrices, Gauss map, and shape operator matrix of the hypersurfaces are calculated. Additionally, the curvatures of the generalized helical hypersurfaces are obtained using the Cayley-Hamilton theorem. The umbilical conditions for the curvatures are provided. Finally, the Laplace-Beltrami operator of the generalized helical hypersurfaces with a time-like axis is presented in E-1(4).
Article
Astronomy & Astrophysics
Erhan Guler
Summary: We introduce the generalized helical hypersurface having a space-like axis in five-dimensional Minkowski space. We compute the first and second fundamental form matrices, Gauss map, and shape operator matrix of the hypersurface. Additionally, we compute the curvatures of the hypersurface by using the Cayley-Hamilton theorem. Moreover, we give some relations for the mean and the Gauss-Kronecker curvatures of the hypersurface. Finally, we obtain the Laplace-Beltrami operator of the hypersurface.
Article
Chemistry, Physical
Zhiming Zhao, Jun Yin, Jian Yin, Xianrong Guo, Yongjiu Lei, Zhengnan Tian, Yunpei Zhu, Omar F. Mohammed, Husam N. Alshareef
Summary: Sustainable battery development is aiming at using aqueous electrolytes to store renewable energy on a large scale. However, the hydrogen evolution reaction (HER) on the anode of aqueous batteries poses a challenge. In this study, by regulating mass transfer kinetics and blocking proton conduction with N-methyl-2-pyrrolidone (NMP), the HER in aqueous batteries is mitigated and stable full-cell batteries are achieved with high Coulombic efficiency.
ENERGY STORAGE MATERIALS
(2023)
Article
Optics
Xiahui Zeng
Summary: The study demonstrates an optimization process of an off-axis parabolic mirror to maximize the focused peak intensity, and establishes an optimum configuration scaling rule. It also assesses the offset and off-axis angle tolerances and provides scaling laws for them. Understanding these scaling laws is important for enhancing the focusability of a laser beam in ultrashort and ultraintense laser-matter interaction experiments.
CHINESE OPTICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Naudin van den Heuvel, Savannah M. Mason, Brandon Q. Mercado, Scott J. Miller
Summary: In this study, a new class of peptide-based dirhodium-(II) complexes was developed as catalysts for the enantioselective amination of complex organic frameworks. The crystal structure of a dirhodium-(II) tetra-aspartate complex was determined, revealing the retention of the beta-turn conformation of the peptide ligand. The catalyst platform demonstrated high levels of enantioselectivity for the amination of C-(sp(3))-H bonds, even for challenging substrates.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
S. G. Mohammed Hussain, R. Kumar, M. Mohamed Naseer Ali, D. Sankar, V Kannappan
Summary: Ultrasonic study of binary liquid mixtures containing n-propyl amine and four different ethers shows the presence of H-bonded interactions and the influence of non-covalent interactions on molecular arrangement, with stronger H-bonded interactions in aromatic ethers systems. Optimized molecular geometries were obtained using Density Functional Theory (DFT) method.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Chemistry, Multidisciplinary
Muhammad Siddique Ahmad, Kamel Meguellati
Summary: C-H bond functionalization is an important field with applications in pharmaceuticals, agrochemicals, and dye chemistry. This review explores the use of catalytic metals and various remote/directing groups for C-H bond functionalization. The catalytic properties of these metals (Pd, Rh, Ru, Mn, Ni, Fe, Cu, or Co) in reactions such as cyanations, arylations, alkenylations, allylations, alkylations, and alkynylations are discussed. Additionally, the functionalization of beta-C(sp(3))-H, ortho-(sp(2))-H carbonyl compounds, gamma-C(sp(3))-H arylation, and gamma-C(sp(2))-H of amines, amino esters, and alkyl acetals is summarized.
Article
Chemistry, Multidisciplinary
Ying-Ai Wu, Rui-An Wang, Shu-Yun Jiang, Tai-Bai Jiang, Jun-Rong Song, Jun Shi, Wei Wu, Wei-Dong Pan, Hai Ren
Summary: In this study, a water-mediated electrochemical synthesis method was developed for the C3/C5-bromocyclization of tryptophol and tryptamine derivatives. By controlling the amount of water, the selective synthesis of 3a- or 5a-bromoindolines was achieved without the need for additional oxidants or additives.
Article
Chemistry, Inorganic & Nuclear
Rui Zhang, Jin-Wang Liu, Wei-Yong Zhong, Jing-Lin Chen, Feng Zhao, Sui-Jun Liu, He-Rui Wen
Summary: The article reports the mechanochromic and selective vapochromic solid-state luminescence properties of a new bimetallic cuprous complex. The response mechanisms are elucidated by investigating the different solvated polymorphs. It is found that the luminescence properties can be controlled by different solvents and grinding-induced breakage of hydrogen bonds.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Xin Zhang, Shuo Tong, Jieping Zhu, Mei-Xiang Wang
Summary: Under the catalysis of PdBr2 and a chiral phosphoramidite ligand, mono (2-bromoaroyl)-substituted calix[4]arene derivatives with upper-rim underwent an easy enantioselective desymmetrization reaction, yielding 9H-fluorene-embedded inherently chiral calixarenes with good yields and excellent enantioselectivities. The transannular dehydrogenative arene-arene coupling reaction most likely proceeded through oxidative addition of the C-aryl-Br bond to a ligated palladium catalyst, followed by a sequence of enantioselective 1,5-palladium migration and intramolecular C-H arylation. This new family of inherently chiral calixarenes has unique chiroptical properties due to their highly rigid structure induced by the 9H-fluorene segment.
