Letter
Chemistry, Multidisciplinary
Hans-Gert Korth
Summary: This Correspondence points out the misinterpretation of the observed EPR spectrum, the misleading presentation of DNA cleavage data, and the unsupported assignment of nitric oxide as a major DNA cleaving agent in the cited article.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Christina M. Legendre, A. Claudia Stueckl, Christian P. Sindlinger, Regine Herbst-Irmer, Dietmar Stalke
Summary: The reaction of potassium metal with sulfurtriimide gives a deep blue cage radical that has been previously difficult to obtain. Physical characterization reveals the existence of an unpaired electron delocalized within the cage, coupled with nitrogen and potassium atoms. X-ray structure analysis further elucidates the structural arrangement of the radical cage species.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Paul Fehling, Kai Buckenmaier, Sergey A. Dobrynin, Denis A. Morozov, Yuliya F. Polienko, Yulia Khoroshunova, Yulia Borozdina, Philipp Mayer, Jorn Engelmann, Klaus Scheffler, Goran Angelovski, Igor A. Kirilyuk
Summary: This study investigated the efficacy of H-1 Overhauser dynamic nuclear polarization in liquids at ultralow magnetic field and polarization field for a variety of spin probes. The results show a correlation between chemical features and physical hyperpolarization-related properties, with small nitroxides exhibiting clear advantages.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Biochemistry & Molecular Biology
Nargiz B. Asanbaeva, Larisa Yu Gurskaya, Yuliya F. Polienko, Tatyana Rybalova, Maxim S. Kazantsev, Alexey A. Dmitriev, Nina P. Gritsan, Nadia Haro-Mares, Torsten Gutmann, Gerd Buntkowsky, Evgeny Tretyakov, Elena G. Bagryanskaya
Summary: This study investigates the feasibility of using ferrocene-substituted 1,3-diazetidine-2,4-diimine couplers as DNP agents. The results show that the spiro-substituted nitroxyl biradicals have a higher DNP gain compared to the methyl-substituted biradicals. The difference in temperature dependence of the EPR spectra is explained using DFT calculations. The effects of nucleophiles and substituents on the ring-opening reaction and the influence of ring opening on the exchange interaction are also examined.
Article
Biochemical Research Methods
Kan Tagami, Raymond Thicklin, Sheetal Jain, Asif Equbal, Miranda Li, Toby Zens, Anthony Siaw, Songi Han
Summary: This article presents the design and construction of a cryogen-free, dual electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) probe for novel dynamic nuclear polarization (DNP) experiments and in situ analysis of DNP mechanisms. The probe design focuses on balancing EPR, NMR, and low temperature performance while maintaining versatility for multi-nuclear NMR detection and broadband DNP/EPR excitation/detection. The article also emphasizes the affordability of EPR/DNP experiments for broader impact in magnetic resonance measurements.
JOURNAL OF MAGNETIC RESONANCE
(2023)
Article
Chemistry, Multidisciplinary
Artem S. Poryvaev, Eva Gjuzi, Daniil M. Polyukhov, Frank Hoffmann, Michael Froba, Matvey V. Fedin
Summary: This study proposes using radical-grafted mesoporous silica as a versatile nanoplatform for spin-based QC/QIP, utilizing stable organic radicals for efficient spin manipulation with long electron spin decoherence time. The mesoporous structure of these composites is nuclear-spin free and allows for embedding guest molecules, promoting robustness and tunability as highly promising nanoplatforms for future QC/QIP developments.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Biochemistry & Molecular Biology
Vitalijs Romanovs, Elena F. Belogolova, Evgeniya P. Doronina, Valery F. Sidorkin, Viatcheslav V. Jouikov
Summary: The electrochemical oxidation of 1-R-substituted silatranes 1, classical representatives of pentacoordinated silicon compounds, and the formation of their short living cation radicals were studied. The main reaction responsible for the decay of these cation radicals is deprotonation, and strategies to increase their stability are proposed. The study involved various techniques such as cyclic and square-wave voltammetry, faradaic impedance spectroscopy, real-time temperature-dependent EPR spectroelectrochemistry, and DFT calculations.
Article
Chemistry, Multidisciplinary
L. T. H. Phong, D. H. Manh, P. H. Nam, V. D. Lam, B. X. Khuyen, B. S. Tung, T. N. Bach, D. K. Tung, N. X. Phuc, T. Hung, Thi Ly Mai, The-Long Phan, Manh Huong Phan
Summary: Cobalt doped magnetite nanoparticles (CoxFe3-xO4 NPs) were extensively studied for their potential application in hyperthermia. The study revealed the impact of cobalt content and particle size on the magnetic and heating properties, showing non-monotonic changes with increasing cobalt content. This research also indicated the potential application of these nanoparticles in magnetic hyperthermia, especially for samples with low cobalt contents where relaxation loss played a primary role in specific absorption rate (SAR).
Article
Chemistry, Multidisciplinary
Arianna Actis, Michele Melchionna, Giacomo Filippini, Paolo Fornasiero, Maurizio Prato, Enrico Salvadori, Mario Chiesa
Summary: This study assesses the influence of morphology and light-excitation on the number and chemical nature of radical defects in carbon nitride (CN) and derives the spatial distribution of native radicals in CN using magnetic dipole-dipole coupling.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Environmental
Lei Xu, Yuting Wang, Erqun Song, Yang Song
Summary: In this study, PBDE-Qs and PBDE-HQs were synthesized and their nucleophilic and redox properties were investigated. It was found that PBDE-Qs react with GSH leading to neurotoxic effects, while PBDE-HQs do not have this capability. EPR analysis revealed the generation of SQ(center dot-) by PBDE-Qs which contributes to their toxicity, especially in PBDE-Q/HQ compounds with bromine substitution on the quinone ring.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Review
Engineering, Environmental
Lingli Wang, Xu Lan, Wenya Peng, Zhaohui Wang
Summary: This review clarifies common mistakes and misinterpretations present in the literature regarding the identification of reactive radical species using quenching and electron paramagnetic resonance (EPR) tests. It aims to help researchers avoid errors when investigating catalytic oxidative mechanisms with these tests.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Biochemical Research Methods
Anne M. Carroll, Sandra Eaton, Gareth Eaton, Kurt W. Zilm
Summary: The study utilized HPHT diamonds as secondary standards for calibration of electron B-1 field strength in various experimental setups. Results showed that the EPR signals of P1 centers in HPHT diamonds are stable and easily observable. The electron spin dynamics observed in HPHT diamond samples make them useful model systems in understanding the effects of electron spin relaxation, magic angle spinning, and inhomogeneous microwave irradiation on DNP enhancement.
JOURNAL OF MAGNETIC RESONANCE
(2021)
Review
Chemistry, Multidisciplinary
Philipp C. Brehm, Antonio Frontera, Rainer Streubel
Summary: This article highlights the discovery and development of phosphanoxyl complex chemistry and its application in radical polymerizations. The interesting reactivity dichotomy is revealed through the synthesis and reactions of precursors. DFT calculations provide insight into the thermal stabilities of precursors and the spin density distributions in reactive intermediates.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Organic
Li Chen, Lanlan Wu, Xiaoli Tan, Antal Rockenbauer, Yuguang Song, Yangping Liu
Summary: Studies have shown that trityl radicals react with biological oxidoreductants such as glutathione, ascorbic acid, and superoxide anion radical, with the reactivity being influenced by the substituents attached to the radicals. Additionally, the substituents also impact the redox potentials of the trityl radicals, highlighting the importance of understanding the role of substituents in the reactivity and properties of these radicals.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Joshua J. Tully, Emily Braxton, Samuel J. Cobb, Ben G. Breeze, Matthew Markham, Mark E. Newton, Paramaconi Rodriguez, Julie Macpherson
Summary: A new method of non-contact electrochemical etching using high conductivity, high concentration, fully dissociated aqueous electrolytes has been proposed to significantly improve the etch rate of sp(2) carbon. Experimental results show that chloride and sulfate electrolytes can significantly increase the etch rates. Electron paramagnetic resonance experiments reveal the importance of electrochemically initiated, solution chemistry radical generation and regeneration pathways in high concentration sulfate and chloride solutions for nano-etching applications.
Article
Biochemistry & Molecular Biology
Emilie Aponte, Marie Lafitte, Audrey Sirvent, Valerie Simon, Maud Barbery, Elise Fourgous, Mariano Maffei, Florence Armand, Romain Hamelin, Julie Pannequin, Philippe Fort, Miquel Pons, Serge Roche, Yvan Boublik
Summary: This study reveals the important role of the unique domain ULBR in Src tyrosine kinase in malignant cell transformation. The ULBR is involved in membrane anchoring, MAPK signaling, and phosphorylation of specific membrane-localized tyrosine kinases needed for Src oncogenic signaling.
Correction
Biochemistry & Molecular Biology
Emilie Aponte, Marie Lafitte, Audrey Sirvent, Valerie Simon, Maud Barbery, Elise Fourgous, Yvan Boublik, Mariano Maffei, Florence Armand, Romain Hamelin, Julie Pannequin, Philippe Fort, Miquel Pons, Serge Roche
Article
Pharmacology & Pharmacy
Lidia Ballell-Hosa, Elisabet Gonzalez-Mira, Hector Santana, Judit Morla-Folch, Marc Moreno-Masip, Yaima Martinez-Prieto, Albert Revuelta, Primiano Pio Di Mauro, Jaume Veciana, Santi Sala, Lidia Ferrer-Tasies, Nora Ventosa
Summary: Topical delivery is of great interest due to localized drug delivery, patient compliance, and low risk for side effects. The DELOS nanovesicles drug delivery platform has shown potential for complex wound treatment and has been successfully formulated into hydrogels with improved stability and rheological properties. This has not been widely reported in literature, and further experiments have demonstrated enhanced bioactivity of integrated proteins in the gellified nanovesicles compared to liquid form.
Article
Chemistry, Analytical
Guillermo Iruela, Alejandro Fernandez, Amin Sagar, Francisco Javier Carvajal, Pau Bernado, Miquel Pons
Summary: In signaling proteins, intrinsically disordered regions are regulatory elements sensitive to environmental effects, ligand binding, and post-translational modifications. We have designed a biosensor for the N-terminal regulatory element of c-Src kinase and used it for drug screening.
Article
Nanoscience & Nanotechnology
Sara Battista, Mariana Koeber, Pierangelo Bellio, Giuseppe Celenza, Luciano Galantini, Guillem Vargas-Nadal, Lorenza Fagnani, Jaume Veciana, Nora Ventosa, Luisa Giansanti
Summary: The newly developed nanovesicle system of the quatsome family shows noticeable antibacterial activity, demonstrating great potential for the treatment of bacterial infections and can also serve as nanocarriers of pharmaceutical actives.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Judit Morla-Folch, Guillem Vargas-Nadal, Edgar Fuentes, Silvia Illa-Tuset, Mariana Koeber, Cristina Sissa, Silvia Pujals, Anna Painelli, Jaume Veciana, Jordi Faraudo, Kevin D. Belfield, Lorenzo Albertazzi, Nora Ventosa
Summary: The development of bright fluorescent nanoparticles is essential for improving the resolution and signal-to-noise ratio in fluorescence imaging techniques. In this study, we developed FRET-based nanovesicles with different dye loadings and investigated their optical properties at the nanoscopic level. The results show that the dye's molecular diffusion in fluid-like membranes can modulate the optical properties of the nanoparticles, resulting in highly efficient and stable nanoprobes.
CHEMISTRY OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
J. Alejandro De Sousa, Raphael Pfattner, Diego Gutierrez, Kilian Jutglar, T. Bromley Stefan, Jaume Veciana, Concepcio Rovira, Marta Mas-Torrent, Bruno Fabre, Nuria Crivillers
Summary: The preparation of monolayers based on an organic radical and its diamagnetic counterpart has been investigated on hydrogen-terminated silicon surfaces. The monolayers exhibit a characteristic diode behavior in solid-state metal/monolayer/semiconductor junctions, which is influenced by the electronic characteristics of the organic molecule. The presence of the radical significantly enhances the rectification ratio and photosensitivity of the junction.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Cell Biology
Fabian Bumbak, Miquel Pons, Asuka Inoue, Juan Carlos Paniagua, Fei Yan, Hongwei Wu, Scott A. Robson, Ross A. D. Bathgate, Daniel J. Scott, Paul R. Gooley, Joshua J. Ziarek
Summary: Nuclear magnetic resonance (NMR) studies have shown that fast methyl sidechain dynamics can provide information about entropically-driven allostery. This study focuses on the fast dynamics of a thermostabilized G protein-coupled receptor (GPCR), neurotensin receptor 1 (NTS1), using 13C epsilon-methionine chemical shift-based global order parameters. The results indicate the presence of substates with different lifetimes in the NTS1 solution ensemble, and the rapid fluctuations of individual methionine residues are correlated with ligand pharmacology, suggesting a role for sub-microsecond dynamics and conformational entropy in GPCR ligand discrimination.
Article
Biochemistry & Molecular Biology
Andras Lang, Alejandro Fernandez, Mireia Diaz-Lobo, Mar Vilanova, Francisco Cardenas, Margarida Gairi, Miquel Pons
Summary: Compared to well-studied regulatory mechanisms, the exact role of Src N-terminal regulatory element (SNRE) in modulating Src activity is still unclear. Phosphorylation of serine and threonine residues in SNRE can affect the interactions with the SH3 domain, potentially serving as an information transduction element. Positively charged sites in SNRE can interact with phosphorylated residues, leading to changes in acidity, local conformation, and functional unit formation. This study utilizes pH-dependent NMR measurements and single point mutations to analyze the electrostatic network in SNRE and provides an alternative method to identify interacting phosphorylated residues without mutations.
Article
Materials Science, Multidisciplinary
Adriana R. Kyvik, Ramon Roca-Pinilla, Karla Mayolo-Deloisa, Xavier Rodriguez Rodriguez, Marc Martinez-Miguel, Marta Martos, Mariana Kober, Nora Ventosa, Jaume Veciana, Judith Guasch, Elena Garcia-Fruitos, Anna Aris, Imma Ratera
Summary: In this study, novel biofunctionalized gold surfaces with the antimicrobial multidomain recombinant protein JAMF1 were developed. The immobilized JAMF1 protein successfully reduced biofilm formation of both Escherichia coli and carbapenem-resistant Klebsiella pneumoniae. This strategy provides new possibilities for biomolecule immobilization in fundamental biological studies and biotechnological applications.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Organic
Lucas A. Zeoly, Lais V. Acconcia, Manoel T. Rodrigues Jr, Hugo Santos, Rodrigo A. Cormanich, Juan C. Paniagua, Albert Moyano, Fernando Coelho
Summary: This article describes a one-pot approach for the synthesis of tricyclic indolizines using a bicyclic imidazole-alcohol catalyst. The method is based on an aqueous Morita-Baylis-Hillman reaction, followed by intramolecular cyclization and dehydration, resulting in the formation of two new bonds (C-C and C-N) in simple conditions. The cyclization efficiency depends on the size of the cycloalkenone ring.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Nerea Gonzalez-Pato, Xavier Rodriguez Rodriguez, Nicola Pellizzi, Claudia Fasolato, Judith Guasch, Paolo Postorino, Jaume Veciana, Alejandro R. R. Goni, Imma Ratera
Summary: We developed an easy and low-cost method to prepare highly homogeneous electroactive substrates for simultaneous surface-enhanced Raman spectroscopy (SERS) and electrochemical measurements. The substrates were made by depositing a quasi-hexagonal pattern of uniformly distributed gold nanoparticles (AuNPs) on conductive indium tin oxide (ITO) using block-copolymer micellar lithography, followed by electrodeposition of additional gold onto the pre-patterned ITO. The resulting substrates exhibited strong and homogeneous Raman signals and demonstrated good electrochemical performance.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Physical
Nerea Gonzalez-Pato, Davide Blasi, Domna M. Nikolaidou, Francesco Bertocchi, Jesus Cerda, Francesca Terenziani, Nora Ventosa, Juan Arago, Andrea Lapini, Jaume Veciana, Imma Ratera
Summary: This article reports the preparation and characterization of organic nanoparticles doped with polychlorinated trityl radicals as nanothermometers for temperature sensing. The nanoparticles show excellent thermal sensitivity and have the potential to be used as nanothermometers in bio applications.
Article
Engineering, Electrical & Electronic
Raphael Pfattner, Elena Laukhina, Jinghai Li, Rossella L. Zaffino, Nuria Aliaga-Alcalde, Marta Mas-Torrent, Vladimir Laukhin, Jaume Veciana
Summary: Composites with different components exhibit unique synergistic properties, and the energy bandgap in their electronic structure can be tuned to design tailor-made systems. A study found an emergent insulator-metal transition in bilayered thin-films at room temperature, and the electrical/optical bandgaps could be adjusted. This makes these materials ideal candidates for flexible and soft sensors for various applications.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Biomaterials
Fabiao Santos, Julia Valderas-Gutierrez, Eduardo Perez del Rio, Miquel Castellote-Borrell, Xavier Rodriguez Rodriguez, Jaume Veciana, Imma Ratera, Judith Guasch
Summary: Despite recent achievements, advanced personalized immunotherapies still face limitations in terms of biomedical and technical aspects. In this study, researchers engineered a three-dimensional hydrogel with an inverse opal structure to mimic the lymph node environment and improve the expansion and proliferation of therapeutic T cells. The hydrogel with precise control over its pore size exhibited enhanced proliferation of primary human CD4+ T cells and outperformed hydrogels without the predetermined pore structure.
BIOMATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Sergey Yu. Ketkov, Sheng-Yuan Tzeng, Elena A. Rychagova, Anton N. Lukoyanov, Wen-Bih Tzeng
Summary: Metallocenes, including methylcobaltocene, play important roles in various fields of chemistry. The ionization energy and vibrational structure of (Cp ')(Cp)Co can be influenced by introducing methyl substituents. The mass-analyzed threshold ionization spectrum and DFT calculations provide accurate information about the properties and transformations of (Cp ')(Cp)Co.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Review
Chemistry, Physical
Qifeng Mu, Jian Hu
Summary: Polymer mechanochemistry has experienced a renaissance due to the rapid development of mechanophores and principles governing mechanochemical transduction or material strengthening. It has not only provided fundamental guidelines for converting mechanical energy into chemical output, but also found applications in engineering and smart devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Da Hye Yang, Francesco Ricci, Fredrik L. Nordstrom, Na Li
Summary: Through systematic evaluation of the oiling-out behavior of procaine, we identified both stable and metastable liquid-liquid phase separation, and established phase diagrams to assist in rational selection of crystallization strategies.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Vikki Anand Varma, Simmie Jaglan, Mohd Yasir Khan, Sujin B. Babu
Summary: Designing engineering structures like nanocages, shells, and containers through self-assembly of colloids is a challenging problem. This work proposes a simple model for the subunit, which leads to the formation of monodispersed spherical cages or containers. The model with only one control parameter can be used to design cages with the desired radius.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Hainan Jiang, Yaolong He, Xiaolin Li, Zhiyao Jin, Huijie Yu, Dawei Li
Summary: The cycling lifespan and coulombic efficiency of lithium-ion batteries are crucial for high C-rate applications. The Li-ion concentration plays a crucial role in determining the mechanical integrity and structural stability of electrodes. This study focuses on graphite as the working electrode and establishes an experimental system to investigate the mechanical properties of composite graphite electrode at different C-rates. Considering the effect of Li-ion concentration in stress analysis is found to be significant.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Zhiye Wang, Yunchuan Li, Mingjun Sun
Summary: This study investigates the influence of intramolecular pi-pi interactions on the electronic transport capabilities of molecules. By designing and analyzing three pi-conjugated molecules, the researchers observe that different pi-conjugated structures have varying effects on electron transport. The findings provide a theoretical foundation for designing single-molecule electronic devices with multiple electron channels based on intramolecular pi-pi interactions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Yuandong Xu, Haoyang Feng, Chaoyang Dong, Yuqing Yang, Meng Zhou, Yajun Wei, Hui Guo, Yaqing Wei, Jishan Su, Yingying Ben, Xia Zhang
Summary: Hollow MoS2 cubes and spheres were successfully synthesized using a one-step hydrothermal method with the hard template method. The hollow MoS2 cubes exhibited higher specific capacitance and energy density compared to the hollow MoS2 spheres. The symmetrical supercapacitors assembled with these hollow structures showed good performance and high capacity retention after multiple cycles. These findings suggest that controlling the pore structure and surface characteristics of MoS2 is crucial for enhancing its electrochemical properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Ainhoa Oliden-Sanchez, Rebeca Sola-Llano, Joaquin Perez-Pariente, Luis Gomez-Hortiguela, Virginia Martinez-Martinez
Summary: The combination of photoactive molecules and inorganic structures is important for the development of advanced materials in optics. In this study, bulky dyes were successfully encapsulated in a zeolitic framework, resulting in emission throughout the visible spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Miaomiao Zhang, Cunyuan Pei, Qiqi Xiang, Lintao Liu, Zhongxu Dai, Huijuan Ma, Shibing Ni
Summary: The design of a solid electrolyte interphase (SEI) plays a crucial role in improving the electrochemical performance of anode materials. In this study, lithium difluoro(oxalate)borate (LiDFOB) is used as an electrolyte additive to form a protective SEI film on Li3VO4 (LVO) anodes. The addition of LiDFOB results in a dense, uniform, stable, and LiF-richer SEI, which enhances the Li-ion storage kinetics. The generated SEI also prevents further decomposition of the electrolyte and maintains the morphology of LVO anodes during charge/discharge processes. This work demonstrates the effectiveness of LiDFOB as a multi-functional additive for LiPF6 electrolytes and provides insights into SEI construction for high-performance LVO anodes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
B. V. Andryushechkin, T. V. Pavlova, V. M. Shevlyuga
Summary: The atomic structure of the Ag(111)-p(4 x 4)-O phase was reexamined and two phases with the same periodicity were discovered. It was demonstrated that the accepted Ag6 model is incompatible with high-resolution oxygen-sensitive STM images.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
S. L. Romo-Avila, D. Marquez-Ruiz, R. A. Guirado-Lopez
Summary: In this study, we used density functional theory (DFT) calculations to investigate the interaction between model graphene oxide (GO) nanostructures and chlorine monoxide ClO. We aimed to understand the role of this highly oxidizing species in breaking C-C bonds and forming significant holes on GO sheets. Our results showed that C-C bonds in a single graphene oxide sheet can be broken through a simple mechanism involving the dissociation of two chemically attached ClO molecules. The formation of carbonyl groups and holes on the GO surface was also observed. This study provides important insights into the degradation of carbon nanotubes and the stability of GO during the myeloperoxidase (MPO) catalytic cycle.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Alberto Garcia-Fernandez, Birgit Kammlander, Stefania Riva, Hakan Rensmo, Ute B. Cappel
Summary: In this study, the X-ray stability of five different lead halide perovskite compositions (MAPbI3, MAPbCl3, MAPbBr3, FAPbBr3, CsPbBr3) was investigated using photoelectron spectroscopy. Different degradation mechanisms and resistance to X-ray were observed depending on the crystal composition. Overall, perovskite compositions based on the MA+ cation were found to be less stable than those based on FA+ or Cs+. Metallic lead formation was most easily observed in the chloride perovskite, followed by bromide, and very little in MAPbI3. Multiple degradation processes were identified for the bromide compositions, including ion migration, formation of volatile and solid products, as well as metallic lead. CsBr was formed as a solid degradation product on the surface of CsPbBr3.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Timofei Rostilov, Vadim Ziborov, Alexander Dolgoborodov, Mikhail Kuskov
Summary: The shock-loading behavior of nanomaterials is investigated in this study. It is found that shock compaction waves exhibit a distinct two-step structure, with the formation of faster precursor waves that travel ahead of the main compaction waves. The complexity of the shock Hugoniot curve of the tested nanomaterial is described, and the effect of initial porosity on the compressed states is demonstrated.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Sergey S. Nikitin, Alexander D. Koryakov, Elizaveta A. Antipinskaya, Alexey A. Markov, Mikhail V. Patrakeev
Summary: The stability of La1/3Sr2/3Fe1-xMnxO3-delta, a perovskite-type oxide, under reducing conditions is dependent on the manganese content. Increasing the manganese content leads to a decrease in stability. The behavior of iron and manganese in the oxide shows distinct differences, which can be attributed to the difference in the enthalpy of oxidation reactions. Additionally, the change in the La/Sr ratio affects the concentration of iron and manganese ions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Mosayeb Naseri, Shirin Amirian, Mehrdad Faraji, Mohammad Abdur Rashid, Maicon Pierre Lourenco, Venkataraman Thangadurai, D. R. Salahub
Summary: Inspired by the successful transfer of freestanding ultrathin films of SrTiO3 and BiFeO3, this study assessed the structural stability and investigated the electronic, optical, and thermoelectric properties of a group of two-dimensional perovskite-type materials called perovskenes. The findings revealed that these materials are wide bandgap semiconductors with potential application in UV shielding. Moreover, they exhibit better electrical and thermal conductivity at high temperatures, enabling efficient power generation in thermoelectric devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)