Article
Chemistry, Multidisciplinary
Wolfgang Hornfeck
Summary: A formula is presented in this paper for generating chiral m-fold multiply twinned two-dimensional point sets with even twin modulus m > 6 from an integer inclination sequence. It particularly discusses the first three non-degenerate cases m = 8, 10, 12, which are connected to the aperiodic crystallography of axial quasicrystals exhibiting octagonal, decagonal, and dodecagonal long-range orientational order and symmetry.
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
(2022)
Review
Chemistry, Multidisciplinary
Biao Zhao, Shenghua Yang, Jianping Deng, Kai Pan
Summary: Chirality and graphene have become important research subjects with the potential to create unique functional materials and discoveries when combined. This overview paper aims to fill the gap in summarizing developments in chiral materials developed from graphene and their derivatives, while also discussing future directions and challenges.
Article
Astronomy & Astrophysics
L. S. Pilyugin, G. Tautvaisiene, M. A. Lara-Lopez
Summary: Researchers searched for Milky Way-like galaxies among a sample of approximately 500 galaxies. They considered the stellar mass, optical radius, rotation velocity, central oxygen abundance, and abundance at the optical radius as the characteristics of the candidate galaxies. If a candidate galaxy had values close to that of the Milky Way, it was referred to as a structural Milky Way analogue. The similarity of oxygen abundance in two galaxies suggested a similarity in their chemical evolution. By considering the structural and evolutionary characteristics, four galaxies were identified as Milky Way twins.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Engineering, Civil
Haishan Tang, Chenglin Zhang, Li Li, Chaosheng Mei, Ling Ling, Yujin Hu
Summary: This study proposes an analytical framework to address the issue of why some structures have numerous rotations but do not exhibit the auxetic behavior. It quantitatively analyzes the independent effects of direct bending of ligaments and rotation of rigid rings on the mechanical properties of chiral and antichiral honeycombs. The study derives analytical expressions for TTC coefficients, Poisson's ratio, and Young's modulus and reveals the effects of various factors on these properties.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Dorian Sonet, Matteo Cayla, Raphael Mereau, Estelle Morvan, Aline Lacoudre, Nicolas Vanthuyne, Muriel Albalat, Dario M. Bassani, Antoine Scalabre, Emilie Pouget, Brigitte Bibal
Summary: The effects of introducing chiral trifluoromethyl alcohol groups on the physical properties and reactivity of 9,10-diphenylanthracenes were investigated. It was found that the position and orientation of the -CH(OH)CF3 groups in the molecules depend on the relative and absolute configurations of each stereoisomer. The study demonstrated that stereochemistry governs the molecular organization in crystals and impacts the reaction products, as well as modulates the chiroptical properties.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Yicong Ma, Chao Lin, Linfeng Cai, Geping Qu, Xiaopeng Bai, Lin Yang, Zhifeng Huang
Summary: Understanding the thermal stability of metallic chiral nanoparticles is crucial for their application as asymmetric catalysts. This study demonstrates a method to enhance the thermal stability of silver chiral nanoparticles through alloying with aluminum and surface coverage, paving the way for their use in high-temperature asymmetric catalysis.
Article
Chemistry, Organic
Barry M. Trost, Chuanle Zhu, Chloe Christine Ence
Summary: This study reports a palladium-catalyzed [3 + 2] cycloaddition using in situ generated sulfone-TMM species to construct various chiral cyclopentyl sulfones in a highly regio-, diastereo-, and enantioselective manner. The robust chiral diamidophosphite ligand is crucial for the reactivity and selectivities of this transformation, allowing for the construction of three chiral centers in a single step.
Review
Chemistry, Multidisciplinary
Matthew J. Genzink, Jesse B. Kidd, Wesley B. Swords, Tehshik P. Yoon
Summary: Asymmetric photocatalysis is a major research topic in contemporary synthetic organic chemistry. However, the discovery of general strategies for highly enantioselective photochemical reactions has been a recent development, leading to a somewhat limited variety of stereocontrolled photoreactions. This review summarizes the chiral catalyst structures that have been studied for solution-phase asymmetric photochemistry, providing insight into the logic required for highly effective stereocontrolled photocatalysis.
Article
Chemistry, Analytical
Lujun Wang, Wanli Gao, Siowwoon Ng, Martin Pumera
Summary: This study introduces a 3D-printed electrochemical chiral sensor functionalized with magnetic COF and BSA, showing excellent chiral recognition ability towards L-Trp compared to D-Trp. The sensor can be used for determining the concentration of L-Trp in a racemic mixture. This on-demand fabrication of protein-COF-modified electrodes offers new approaches for enantiomer recognition.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Spencer D. Golze, Stefania Porcu, Chen Zhu, Eli Sutter, Pier Carlo Ricci, Edward C. Kinzel, Robert A. Hughes, Svetlana Neretina
Summary: The study introduces a light-driven solution-based synthesis approach to produce helical gold spirals from substrate-bound seeds. This growth mode relies on three separate symmetry-breaking events: seeds with planar defects, a capping agent that impedes early growth, and Coulombic repulsion when charged growth fronts collide.
Article
Chemistry, Multidisciplinary
Audrey R. Sulkanen, Minyuan Wang, Logan A. Swartz, Jaeuk Sung, Gang Sun, Jeffrey S. Moore, Nancy R. Sottos, Gang-Yu Liu
Summary: This study introduces a method to create organizational chirality by design with nanometer precision using atomic force microscopy-based nanolithography and chosen surface chemistry. Various chiral structures are produced with nanometer precision, with high fidelity to the designs. This research provides researchers with a new and generic means to carry out organizational chiral chemistry and opens up new promising applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Jianan Yuan, Xuemin Lu, Qingxiang Li, Zhiguo Lu, Qinghua Lu
Summary: This study fabricated micrometer-scale spiral structures with reversible chirality based on the assembly of a liquid crystalline block copolymer film assisted by enantiopure tartaric acid. The chiral spiral structures with controllable handedness were easily erased under ultraviolet light irradiation and restored via thermal annealing. This research provides guidance for fabrication of chiral micrometer-scale spiral structures with adjustable chiral properties.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Physics, Fluids & Plasmas
Akira Kageyama, Nobuaki Ohno
Summary: When the Rayleigh number is low, Rayleigh-Benard convection in a nonrotating spherical shell with central gravity has symmetric solutions in terms of three-dimensional discrete rotation. We found an alternative type of steady convection in a nonrotating spherical shell by computer simulations, which has the discrete rotational symmetry of a regular tetrahedron with no reflection symmetry.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Materials Science, Multidisciplinary
Weidong Liu, Zhendong Yang, Jiong Zhang
Summary: Novel chiral cellular structures composed of half-periodic and full-periodic cosinoidal beams were proposed in this paper, with low equivalent elastic moduli and high strain capabilities, suitable for flexible structures and morphing applications. The elastic properties of these structures can be tuned by varying geometric parameters.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Ceramics
Kecheng Ye, Zhijiang Wang
Summary: In this study, a single-phase B4C ceramic was fabricated using fast hot-pressing sintering, and it was found that the samples synthesized under the optimal sintering condition exhibited high mechanical properties, with twins playing a crucial role in toughening.
CERAMICS INTERNATIONAL
(2022)
