Article
Chemistry, Multidisciplinary
Louis Kimberley, Alena M. Sheveleva, Jiangnan Li, Joseph H. Carter, Xinchen Kang, Gemma L. Smith, Xue Han, Sarah J. Day, Chiu C. Tang, Floriana Tuna, Eric J. L. McInnes, Sihai Yang, Martin Schroder
Summary: This study presents an efficient method for oxidizing benzylic C-H groups using the metal-organic framework material MFM-170, which can be applied to a wide range of substrates under mild conditions. Comprehensive investigations utilizing electron paramagnetic resonance (EPR) spectroscopy and synchrotron X-ray diffraction have identified the critical role of the paddlewheel moiety in activating the oxidant.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
S. Kollarics, F. Simon, A. Bojtor, K. Koltai, G. Klujber, M. Szieberth, B. G. Markus, D. Beke, K. Kamaras, A. Gali, D. Amirari, R. Berry, S. Boucher, D. Gavryushkin, G. Jeschke, J. P. Cleveland, S. Takahashi, P. Szirmai, L. Forro, E. Emmanouilidou, R. Singh, K. Holczer
Summary: High concentration of negatively charged nitrogen-vacancy (NV-) centers was successfully created in diamond single crystals containing approximately 100 ppm nitrogen using electron and neutron irradiation and subsequent thermal annealing. The formation process and properties of NV- centers were observed, with about 25% of vacancies forming NVs during the annealing process, and high precision measurement of hyperfine and quadrupole coupling constants was achieved using EPR techniques.
Article
Microbiology
Mutsumi Komeyama, Kohsuke Kanno, Hiroyuki Mino, Yoko Yasuno, Tetsuro Shinada, Tomokazu Ito, Hisashi Hemmi
Summary: The archaeal modified mevalonate pathway in archaea involves the biosynthesis of isopentenyl diphosphate and dimethylallyl diphosphate through trans-anhydromevalonate phosphate. A key enzyme called phosphomevalonate dehydratase catalyzes the formation of trans-anhydromevalonate phosphate from (R)-mevalonate 5-phosphate. This enzyme belongs to the aconitase X family and has a [4Fe-4S] cluster, unlike its bacterial counterparts which have a [2Fe-2S] cluster.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Chemistry, Analytical
Hideo Utsumi, Toshiki Masumizu, Ryoma Kobayashi, Tomoko Tahira, Fuminori Hyodo, Tatsuya Shimizu, Tatsuya Naganuma, Kazunori Anzai
Summary: Free radicals are key substances in organisms but can also cause oxidative diseases. Dynamic nuclear polarization- magnetic resonance imaging is a noninvasive imaging method that can be used for in vivo free radical imaging.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Kevin Rossi, Andrea Ruiz-Ferrando, Dario Faust Akl, Victor Gimenez Abalos, Javier HerasDomingo, Romain Graux, Xiao Hai, Jiong Lu, Dario Garcia-Gasulla, Nuria Lopez, Javier Perez-Ramirez, Sharon Mitchell
Summary: This study investigates the organization and interactions of metal centers in ultra-high-density single-atom catalysts using microscopy, machine learning, and simulations. The findings reveal the presence of multimers with increasing atom density, characterize the size and shape of low-nuclearity clusters, and identify surface atom density criteria for isolation. Additionally, the study uncovers repulsive interactions that influence the disordered distribution of metal centers and quantifies the degree of intermixing in multimetallic systems.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Mitchell Juneau, Daphna Yaffe, Renjie Liu, Jane N. Agwara, Marc D. Porosoff
Summary: This study aims to investigate the performance of transition metal carbide catalysts in the reverse water-gas shift (RWGS) reaction and evaluate the CO2 hydrogenation of tungsten carbide. By encapsulating tungsten in silica, the particle size is preserved and correlations between active phase composition and reaction performance are demonstrated.
Article
Materials Science, Ceramics
Alessio Zandona, Victor Castaing, Alexander Shames, Gundula Helsch, Joachim Deubener, Ana Isabel Becerro, Mathieu Allix, Adrian Goldstein
Summary: An ultrabasic invert silicate glass was synthesized and used as host for transition metal dopants. Characterization techniques were employed to investigate the oxidation and coordination states of the dopants. Different dopants exhibited different oxidation states, with some displaying only their maximum oxidation state and others showing mixed valences. Reduction of oxygen content in the melting atmosphere led to the conversion of Cr6+ to Cr3+.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
Toshinobu Nakajo, Jun Kumagai, Shinpei Kusaka, Akihiro Hori, Yuh Hijikata, Jenny Pirillo, Yunsheng Ma, Ryotaro Matsuda
Summary: Triplet carbenes (TCs) are highly reactive species with unique electronic states, making it challenging to balance reactivity and stability. By confining TCs in the nanospace of a metal-organic framework (MOF), it is possible to enhance their thermal stability while maintaining reactivity, allowing for the stabilization of highly reactive species.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Luca Spiridigliozzi, Gianfranco Dell'Agli, Emanuela Callone, Sandra Dire, Renzo Campostrini, Paolo Bettotti, Mauro Bortolotti, Giorgio Speranza, Vincenzo M. Sglavo, Mattia Biesuz
Summary: This work investigates the effect of lithium doping on the structural and thermal behavior of a high entropy oxide. The results show that the presence of lithium prevents the reduction of Co3+ ions in the high entropy oxide and suggests the existence of Co3+ within the rock salt lattice. At high temperature, the high entropy oxide loses oxygen and changes the charge compensation mechanism for lithium incorporation. Additionally, the study finds that lithium exists in two distinct chemical environments in the high entropy oxide, indicating the presence of short-range order and possible M3+-Li+ pairs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Michael G. Papanikolaou, Anastasia V. Simaioforidou, Chryssoula Drouza, Athanassios C. Tsipis, Haralampos N. Miras, Anastasios D. Keramidas, Maria Louloudi, Themistoklis A. Kabanos
Summary: This study investigates the reaction mechanism and catalytic performance of oxidovanadium(IV) compounds through experimental and theoretical calculations. The results show that the methylated compounds are inert towards the reaction with KF, possibly due to steric hindrance. Moreover, the oxidovanadium(IV) compounds act as catalysts for alkane oxidation in the presence of aqueous H2O2.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
M. Orio, J. K. Bindra, J. van Tol, M. Giorgi, N. S. Dalal, S. Bertaina
Summary: The DMAMgF compound displays local disorder in the high temperature paraelectric phase, while a single structure phase with two magnetic structures is detected in the low temperature ferroelastic phase. The complex electron paramagnetic resonance signals were identified using the Rabi oscillation method combined with crystal field kernel density estimation.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Anthony J. Campanella, Manh-Thuong Nguyen, Jun Zhang, Thacien Ngendahimana, William E. Antholine, Gareth R. Eaton, Sandra S. Eaton, Vassiliki-Alexandra Glezakou, Joseph M. Zadrozny
Summary: This work investigates how variations in ligand structures affect the EPR spectroscopic properties of five Cr(III) complexes, indicating that the spectral broadening is correlated to rigidity in the inner coordination sphere and reflected in ligand-dependent distribution of Cr-N bond distances.
DALTON TRANSACTIONS
(2021)
Article
Physics, Multidisciplinary
B. F. Gabbasov, I. N. Gracheva, A. A. Rodionov, A. G. Kiiamov, S. I. Nikitin, D. G. Zverev, V. A. Trepakov, A. Dejneka, L. Jastrabik, R. V. Yusupov
Summary: The EPR studies of Fe3+ and Mn4+ impurity centers in high-quality single-crystal SrTiO3 plates show that the symmetry of the crystal structure changes with temperature, with the high-temperature tetragonal state having a different structure from the conventional low-temperature anti-ferrodistorsive phase.
Article
Chemistry, Physical
Ying Jiang, Guozhong Lu, Shinuo Kang, Fushan Geng, Bingwen Hu
Summary: This article investigates the difference between ultrathin lithium metal layers on Cu-CC under pressure-holding and non-pressure-holding conditions, and explores the impact of ultrathin lithium metal layers on electrochemical performance.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Juvinch R. Vicente, Amanda Durkin, Kristina Shrestha, Mihaela Balu
Summary: Melanin plays a significant role in skin homeostasis and protection. The two-photon excited fluorescence lifetime detection method allows for selective and quantitative measurement of melanin. Previous studies lacked consideration of skin heterogeneity due to limited field of view. In this work, a fast large-area multiphoton exoscope was used to evaluate the 3D distribution of epidermal melanin content, improving measurement reliability.
SCIENTIFIC REPORTS
(2022)
Article
Polymer Science
Mustafa Kalay, Abidin Esidir, Mahmut Ruzi, N. Burak Kiremitler, Mustafa Serdar Onses
Summary: This study proposes stable and addressable polymer PUFs, utilizing a cross-linkable polymer system, which demonstrates high stochastic characteristics and low-cost production. The performance of the polymer features is evaluated through various analyses, and direct image authentication is achieved using feature matching algorithms.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Jingyu Jin, Guoqiang Lu, Jun Nie, Xiaoqun Zhu
Summary: Photopolymerization technology is limited in the fields of food packaging and biomedicine due to the high migration of small molecules from photoinitiators. In this study, a polymerizable 2-vinyl thioxanthone (ETX) was synthesized to improve the migration stability of photoinitiators. Macromolecular photoinitiators (PPI1, PPI2) were also prepared to further reduce migration. The results showed that the ETX/TEOA system had higher initiation performance and PPI2 displayed favorable initiation ability. Additionally, the migration of ETX, PPI1, and PPI2 in photocured film was significantly reduced. These low-migration photoinitiators have potential applications in the fields of food packaging and biological materials.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Weijie Li, Jun Nie, Yingying Zhao, Xiaoqun Zhu
Summary: This study focuses on the development of high-performance, low-migration photoinitiators. A polymerizable photoinitiator (VBP) was synthesized by introducing an ethylene group into benzophenone, and three different molecular weight single-component photoinitiators (PVBN1-3) were synthesized based on VBP. The results show that these new photoinitiators have stronger absorption ability compared to benzophenone and significantly reduce the migration of initiators and co-initiators, addressing the safety concerns caused by migration.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Seira Morimune-Moriya, Yuki Iwahashi, Mitsuru Nakamura, Daisuke Ogawa, Keiji Nakamura
Summary: This study investigates the effect of plasma treatment on carbon nanotubes (CNTs) and the structure/properties of polyimide (PI) nanocomposites with ultra-low content of CNTs. The results show that plasma treatment introduces isocyanate groups on the surface of CNTs and enhances the interfacial interaction between PI and treated CNTs. This leads to a significant improvement in the mechanical properties of the nanocomposites, with even a small addition of treated CNTs showing a substantial increase in Young's modulus, tensile strength and toughness.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Yuanlong Li, Chaojie Chen, Guoqing Cui, Li Liu, Chao Zhou, Guangfeng Wu
Summary: In this study, a novel ion-conducting hydrogel was fabricated using a straightforward approach. The hydrogel showed excellent tensile properties and high toughness due to physical interactions and covalent binding. Additionally, the introduction of hydroxyethyl cellulose and lithium chloride improved the biocompatibility, mechanical properties, electrical conductivity, and frost resistance of the hydrogel, demonstrating its potential for cold climate applications.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Dengwei Yan, Jinxian Yang, Xuejun Pan, Xiaozheng Duan, Lianwei Li, Mo Zhu
Summary: The influence of backbone length on grafting efficiency during the graft-onto reaction process was investigated. It was found that the polydispersity effect of backbone length does not affect the final grafting efficiency, indicating that the local dynamics of chain segments dominate the graft-onto process.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Zhaoyi Luo, Xianjie Pan, Fanqi Liu, Quanxi Yi, Yanning Zeng, Yunhua Chen, Chaoyang Wang
Summary: This study provides a method to prepare high-performance epoxy materials with good malleability and thermal stability. The materials have self-healing and welding capabilities, thanks to the addition of specific chemical bonds and network structures. They exhibit mechanical properties comparable to commercial epoxy resins and show great potential for sustainable industrial development.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Chaoji Xiong, Hao Wang, Lihua Deng, Kun Liang, Chunhua Wu, Wei Wu, Qian Chen
Summary: In this study, four polyamides were synthesized and their adsorption performances for Hg2+ in aqueous systems were investigated. The polyamides exhibited high adsorption capacities and excellent reusability, with the involvement of sulfur, nitrogen, and oxygen in the chemical adsorption process of Hg2+.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Siim Laanesoo, Olivier Bonjour, Rauno Sedrik, Iris Tamsalu, Patric Jannasch, Lauri Vares
Summary: The insertion of rigid aliphatic or aromatic building blocks in polymer structures is an effective way to synthesize high -Tg polymer materials. In this study, a series of isosorbide-2-aryl carboxylate-5-methacrylate monomers (ArIMAs) were synthesized by functionalizing isosorbide 5-methacrylate with various aromatic lignin-inspired esters. These monomers were polymerized to obtain high molecular-weight poly(aryl carboxylate isosorbide methacrylates) (PArIMAs). The resulting polymers showed high glass transition temperatures and thermal stability, making them suitable for use as high-performance plastics and coatings.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Yuqian Wu, Weijie Xu, Jianliang Li, Zhangfeng Zhong, Liqing Huang, Shengke Li, Huaping Tan
Summary: This study investigates the improvement of degradation and drug release characteristics of dynamic Schiff base-mediated natural polysaccharide hydrogels using tannic acid (TA), leading to enhanced stability and functionality.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Xi Zhang, Xiangli Kong, Xin Zhou, Yiyan Gao, Yibo Sun, Guanghui Gao, Wei Liu, Kai Shi
Summary: Conductive hydrogels have great development prospects in flexible strain sensors, but long-term direct contact with human skin can cause bacterial infection. A hydrogel with antibacterial, biocompatibility, and toughness was designed and manufactured using a freeze-thaw method. The hydrogel maintains tensile properties and fatigue resistance at low temperatures and is resistant to bacteria. Therefore, hydrogel sensors can be used to monitor human movements.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Wei Zhang, Jiangang Yu, Mingyang Wu, Rui Li, Anqiang Zhang, Yaling Lin
Summary: In this study, polyacrylamide containing quaternary ammonium salts (PAM-X) were synthesized and found to effectively inhibit soil-borne pathogenic fungi while maintaining the balance of microbial population in soil. PAM-X also showed low toxicity to earthworms and fish, providing a new method for the prevention and control of soil-borne fungal diseases.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Jiawen He, Haojie Yu, Li Wang, Jian Yang, Yanhui Zhang, Wenbing Huang, Chenguang Ouyang
Summary: This review discusses the use of polymeric hydrogels for atmospheric water harvesting (AWH), including the mechanism of water sorption, fabrication methods, and strategies for optimizing the structure of hydrogels. The extended applications of hygroscopic photothermal hydrogels, such as agricultural irrigation and dehumidification, are also explored. The challenges and prospects of using polymeric hydrogels for AWH are summarized.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Ying Du, Shuaishuai Lu, Yuanna Sun, Qingshan Li, Xinhai He
Summary: This study introduces a method to improve the performance of hydrogels by incorporating proline, resulting in hydrogels with excellent stretchability, high conductivity, and long-term stability. The hydrogel remains flexible and conductive even at ultra-low temperatures.
EUROPEAN POLYMER JOURNAL
(2024)