Article
Chemistry, Multidisciplinary
Joaquin Martinez-Ortigosa, Jorge Simancas, Jose A. Vidal-Moya, Fernando Rey, Susana Valencia, Teresa Blasco
Summary: The nature of organic structure directing agents plays a crucial role in determining the final properties of zeolites. The incorporation of tetrapropylphosphonium (TPP) as an OSDA in silicalite-1 zeolites leads to the formation of more defective sites compared to tetrapropylammonium (TPA). Advanced NMR techniques reveal that the presence of TPP influences the physico-chemical properties of zeolites by causing the formation of specific structural defects near the entrapped OSDA molecules.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Kengo Nakamura, Peipei Xiao, Ryota Osuga, Yong Wang, Shuhei Yasuda, Takeshi Matsumoto, Junko N. Kondo, Mizuho Yabushita, Atsushi Muramatsu, Hermann Gies, Toshiyuki Yokoi
Summary: This research emphasized the importance of Al distribution in CHA-type zeolite for the formation of active Cu species and oxidative conversion of CH4. Isolated Al atoms in the zeolite framework were found to be beneficial for producing CH3OH. Acid sites also played a significant role in the production of hydrocarbons, converting CH3OH into hydrocarbons.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yukai Zhao, Weichi Liang, Yihan Wang, Yan Tong, Zhanhong Li, Yuqian Liang, Xiaolong Liu, Jiuxing Jiang
Summary: Zeolite, as a solid acid, has various applications. By introducing F-@d4r into pure silica zeolites, a new type of acid site is created, which shows thermal stability and catalytic activity.
Article
Chemistry, Applied
Matteo Giordani, Katarzyna Skrzynska, Georgia Cametti
Summary: The dehydration behavior of a natural thomsonite with disordered Si/Al distribution was investigated, revealing structural changes and crystal form transitions with increasing temperature.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Yuki Sada, Shoko Miyagi, Kenta Iyoki, Masato Yoshioka, Tomoya Ishikawa, Yusuke Naraki, Tsuneji Sano, Tatsuya Okubo, Toru Wakihara
Summary: The flexible control of composition and atomic arrangement is the ultimate goal in materials science. The study successfully synthesized a high-silica zeolite with biased Al distribution.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Juna Bae, Michiel Dusselier
Summary: The activity and selectivity of acid-catalyzed chemistry are influenced by the Bronsted and Lewis acid sites generated by Al substitutions in zeolite framework. Close proximity of two Al atoms in high-silica zeolites can enhance the performance of redox catalysts. Various strategies have been developed to control the Al incorporation, including variation in extra-framework components, isomorphous substitution, and control over the (alumino)silicate network. This review provides guidance on efficient methods to prepare fine-tuned zeolites with desired chemical properties.
CHEMICAL COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Zeinab Mcheik, Ludovic Pinard, Joumana Toufaily, Tayssir Hamieh, T. Jean Daou
Summary: Hierarchical MOR-type zeolites were synthesized using CTAB as a porogen agent, showing higher porous volume and BET surface area. Increasing CTAB concentration led to higher mesoporous volume and BET surface area, while preserving zeolite micropores. By reducing the aluminum content in the synthesis gel, the Si/Al ratio of the zeolite framework can be increased. These synthesized hierarchical MOR-type zeolites exhibited improved catalytic activity for n-hexane cracking compared to large zeolite crystals obtained without CTAB.
Review
Chemistry, Multidisciplinary
Jialiang Li, Mingkun Gao, Wenfu Yan, Jihong Yu
Summary: In this review, the principles and methodologies for regulating the Si/Al ratios and Al distributions of zeolites were discussed. Methods such as seed-assisted recipe modification, interzeolite transformation, fluoride media, and usage of organic structure-directing agents (OSDAs) were explored. The conventional and newly developed characterization methods for determining the Si/Al ratios and Al distributions were summarized. The impact of Si/Al ratios and Al distributions on the catalysis, adsorption/separation, and ion-exchange performance of zeolites were demonstrated.
Article
Chemistry, Physical
N. H. Alonizan
Summary: Pure and Al-doped ZnO nanoparticles were synthesized using hydrothermal technique. The structural and phase analysis showed that Al doping increased the crystallite size and caused compressive stress formation in the material network. Other studies investigated the impact of different Al doping ratios on powder morphology, optical bandgap, and electronic defects localized in the material band-gap.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yue Sun, Zimin Zhao, Gaohui Wu
Summary: A novel composite with in situ synthesized of Ti2(Al,Si)C solid solution reinforced Al matrix was fabricated via one-step solid solution and densification method. The relationship between microstructure, phase composition and mechanical properties of the composites doped with different Si content and fabricated at different sintering temperature was investigated. The results showed that introducing Si can enhance the hardness and elastic modulus of the composites, and an optimal balance of strength and plasticity can be achieved when the Si content is 2 wt% and the sintering temperature is 570 degrees C.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Multidisciplinary
Mizuho Yabushita, Yoshiyasu Imanishi, Ting Xiao, Ryota Osuga, Toshiki Nishitoba, Sachiko Maki, Kiyoshi Kanie, Wenbin Cao, Toshiyuki Yokoi, Atsushi Muramatsu
Summary: The paired Al species pre-formed in Al-rich amorphous aluminosilicates were transcribed into high-silica CHA-type zeolite frameworks under hydrothermal conditions, showing higher Sr2+ uptake compared to control CHA zeolite synthesized by conventional procedure.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Israel Pala-Rosas, Jose Luis Contreras, Jose Salmones, Ricardo Lopez-Medina, Deyanira Angeles-Beltran, Beatriz Zeifert, Juan Navarrete-Bolanos, Naomi N. Gonzalez-Hernandez
Summary: Y-type zeolites with Si/Al ratios between 7-45 were studied as catalysts for the aminocyclization reaction between acrolein and ammonia. The catalytic activity increased with higher total acidity per gram of catalyst. Pyridine and 3-picoline were produced, along with cracking products, and the selectivity towards 3-picoline was favored with a Bronsted/Lewis acid sites ratio close to 1. The deactivation of the catalysts depended on their textural properties, and the spent catalysts showed uniform deposition of polyaromatic species, resulting in loss of activity.
Article
Chemistry, Applied
Lisha Wei, Hui Yang, Pengju Ren, Yong Yang, Yong-Wang Li, Ruifeng Li, Xiao-Dong Wen, Haijun Jiao
Summary: This study investigates the Al substitution position and acid strength of Y zeolite using computational model and method. The results indicate that the more Al substitution, the weaker the acid strength, and the adsorption enthalpies of different acid sites at different Si/Al ratios can vary significantly, suggesting mutual interaction and local confinement effect.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Xueqing Liu, Nengsheng Liu, Xiang Li, Xiaoying Li, Bo Hu, Sufang He
Summary: In this study, the influence of calcination temperature on the properties of aluminum-modified SBA-15 (Al-SBA-15x) and its adsorption performance for As(V) was investigated. It was found that calcination affected the formation of different alumina types on the surface of SBA-15, leading to changes in surface acidity and Al-OH groups, which were the adsorption sites for As(V). However, high calcination temperature resulted in reduced surface acidity, changes in the acid-base environment, and partial collapse of mesoporous channels, leading to decreased adsorption capacity. Kinetic models were used to study the relationship between microstructure and adsorption processes, and recycling tests demonstrated the reusability of Al-SBA-15x samples.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Environmental Sciences
Fanyi Kong, Shenggao Lu
Summary: In this study, the effects of silicon calcium magnesium potassium fertilizer, calcium magnesium phosphate fertilizer, and lime on improving acidic soils were investigated. It was found that the application of these amendments transformed the active fractions of aluminum to stable ones. Furthermore, these amendments significantly influenced the composition of microbial community in rhizosphere soils, improving soil microbial function and dehydrogenase activity. The study also established an index, AIV, to assess the relationship between acidity-related indicators and other soil properties. The results indicated that SIAs had minimal effect on the fungal community structure but greatly influenced the abundance of bacteria, particularly Acidobacteria, Nitrospirae, and Crenarchaeota. These findings suggested that SIAs optimized soil environment for rice growth by reducing aluminum mobility, enhancing soil microbial function, and increasing soil fertility.
Article
Energy & Fuels
Satit Yousatit, Ryota Osuga, Junko N. Kondo, Toshiyuki Yokoi, Chawalit Ngamcharussrivichai
Summary: In this study, a mesoporous carbon/silica (MCS) nanocomposite was synthesized as a catalyst support for the production of 5-hydroxymethylfurfural (HMF) from glucose. By modifying the MCS surface, a series of acid-base catalysts were developed, and the acid-base properties could be tuned by adjusting the content of sulfonic acid and amino propyl groups. The developed MCS-SO3H-NH2 catalyst showed high HMF yield and selectivity when compared to other catalyst systems.
Article
Engineering, Chemical
Ryota Osuga, Atsushi Neya, Motohiro Yoshida, Mizuho Yabushita, Shuhei Yasuda, Sachiko Maki, Kiyoshi Kanie, Toshiyuki Yokoi, Atsushi Muramatsu
Summary: This study successfully improved the catalytic performance of low-temperature oxidative coupling of methane by using Ce-MFI zeolite supported Pd catalysts modified by a second metal. It was found that the coexistence of Pd and Co on Ce-MFI positively affected the C2H6 yield, and the highly dispersed Ce species in Ce-MFI also played a positive role in the catalytic reaction.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Yoshinobu Kamakura, Shuhei Yasuda, Naoki Hosokawa, Shunta Nishioka, Sawa Hongo, Toshiyuki Yokoi, Daisuke Tanaka, Kazuhiko Maeda
Summary: Metal-organic frameworks and coordination polymers are promising candidates for high-performance photocatalysts due to their tunable electronic and structural properties. This study presents a unique coordination polymer with a metal-sulfur bond, exhibiting efficient photocatalytic reduction of CO2 to formate under visible light irradiation.
Article
Chemistry, Inorganic & Nuclear
Akira Imaizumi, Akinobu Nakada, Takeshi Matsumoto, Toshiyuki Yokoi, Ho-Chol Chang
Summary: This study demonstrates a simple thermal synthesis of porous aluminosilicates from a single-source spiro-7-type molecular precursor. The synthesized aluminosilicates show low carbon content, large surface area, and improved catalytic activity.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Atikhun Chottiratanachote, Manaswee Suttipong, Umer Rashid, Vudhichai Parasuk, Junko Nomura Kondo, Toshiyuki Yokoi, Ali Alsalme, Chawalit Ngamcharussrivichai
Summary: This study aims to synthesize alpha,beta-unsaturated carbonyl compounds with branched structures via aldol condensation of furfural and 2-butanone using MgAl mixed oxides as catalysts. The most suitable catalyst is LDO3 with a 3:1 Mg:Al atomic ratio. The suitable reaction conditions to produce the branched-chain C9 ketones are 1:5 furfural:2-butanone molar ratio, 5 wt.% catalyst loading, 120 degrees C reaction temperature, and 8 h reaction time.
Article
Chemistry, Physical
Tomoki Kanazawa, Shunta Nishioka, Shuhei Yasuda, Daichi Kato, Toshiyuki Yokoi, Shunsuke Nozawa, Hiroshi Kageyama, Kazuhiko Maeda
Summary: The local structure dependence of BaTiO3-xHx on the doped H- amount was investigated using Raman and X-ray absorption fine-structure (XAFS) spectroscopy measurements. It was found that the tetragonal phase transforms into the cubic phase when the doped H- amount is relatively large (x ≥ 0.2). XAFS measurements revealed that the TiO6 octahedral symmetry in BaTiO3-xHx is strongly affected by the doped H- amount, where an increase of H- relaxes the local distortion of the Ti [111] displacement and causes the tetragonal-to-cubic structural change.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Nuttapat Thiensuwan, Sivashunmugam Sankaranarayanan, Toshiyuki Yokoi, Chawalit Ngamcharussrivichai
Summary: The Ru-based nanocomposites supported on exfoliated MgAl-double oxides were investigated for the catalytic oxidation of HMF to FDCA. The exfoliated LDO-supported Ru catalysts showed enhanced textural properties, RuO x dispersion, and basicity, resulting in better catalytic activity. Among them, Ru(3)/ESV-LDC catalyst exhibited good reusability without significant loss of HMF conversion and FDCA yield.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Bernd Marler, Hermann Gies, Trees De Baerdemaeker, Ulrich Mueller, Andrei-Nicolae Parvulescu, Weiping Zhang, Toshiyuki Yokoi, Feng-Shou Xiao, Xiangju Meng, Dirk De Vos, Ute Kolb
Summary: A new zeolite, COE-11, was synthesized through hydrothermal synthesis and characterized as a microporous borosilicate zeolite with a 2D pore system. It has a close structural relationship with zeolite beta polymorph B but differs in pore system dimensionality.
CHEMISTRY-SWITZERLAND
(2023)
Article
Biochemistry & Molecular Biology
Kamolwan Jermjun, Rujeeluk Khumho, Mookarin Thongoiam, Satit Yousatit, Toshiyuki Yokoi, Chawalit Ngamcharussrivichai, Sakdinun Nuntang
Summary: In this study, natural rubber/hexagonal mesoporous silica (NR/HMS) nanocomposites were synthesized and used as selective adsorbents to separate EGCG and CAF from green tea. The NR/HMS materials showed high adsorption capacity for EGCG and could be reused multiple times. This research suggests the potential use of NR/HMS nanocomposites for enriching EGCG in green tea and reducing CAF content. Rating: 8/10.
Article
Chemistry, Multidisciplinary
Akinobu Miyoshi, Megumi Okazaki, Kosaku Kato, Tomoki Kanazawa, Toshiyuki Yokoi, Shunta Nishioka, Shunsuke Nozawa, Akira Yamakata, Kazuhiko Maeda
Summary: The development of a photocatalyst capable of evolving H-2 from water under visible light is important. Pd was found to be the best-performing cocatalyst for TiO2:N,F under UV-vis irradiation. However, under visible-light irradiation, the activity of Pd/TiO2:N,F for H-2 evolution was negligibly small.
Article
Materials Science, Multidisciplinary
Kenta Aihara, Ryusuke Mizuochi, Megumi Okazaki, Shunta Nishioka, Shuhei Yasuda, Toshiyuki Yokoi, Fumitaka Ishiwari, Akinori Saeki, Miki Inada, Kazuhiko Maeda
Summary: Mixed-anion compounds are difficult to synthesize compared to ordinary single-anion counterparts, but they have great potential as visible-light-driven photocatalysts. In this study, Pb2Ti2O5.4F1.2 particles with a well-defined octahedral shape were successfully synthesized by a microwave-assisted hydrothermal (MHT) method at 473 K. The MHT-Pb2Ti2O5.4F1.2 showed improved activity for visible-light H-2 evolution compared to its analogue synthesized by a conventional solid-state reaction (SSR). A postheating treatment further enhanced its activity, and the optimized MHT-Pb2Ti2O5.4F1.2 achieved nonsacrificial H-2 evolution in the presence of a reversible electron donor.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Physical
Peipei Xiao, Yong Wang, Kengo Nakamura, Yao Lu, Junko N. Kondo, Hermann Gies, Toshiyuki Yokoi
Summary: In this study, a strategy to reduce the thickness along the c-axis of AEI-type zeolite crystals was adopted to improve the catalytic properties and stability in the direct oxidation of methane to methanol. The sheet-like Cu-exchanged AEI zeolite exhibited better performance compared to the typical cubic-shaped zeolite. This was attributed to the decreased straight channel length, which facilitated reactant and product diffusion and suppressed the secondary reaction of methanol to olefins.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Mizuho Yabushita, Ryota Osuga, Toshiyuki Yokoi, Atsushi Muramatsu
Summary: Oxidative upgrading of methane into valuable products can be achieved at low temperatures over zeolite-based catalysts. The unique tunability provided by zeolite framework structures enables the design of active species, resulting in excellent catalytic performance. This article categorizes the active species in zeolite-based catalysts into three groups and provides a comprehensive overview of their performance, structure, and catalysis.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yuta Shiroma, Hiroto Mogi, Takeaki Mashiko, Shuhei Yasuda, Shunta Nishioka, Toshiyuki Yokoi, Shintaro Ida, Koji Kimoto, Kazuhiko Maeda
Summary: Modification of the interlayer nanospaces of lamellar solids can enhance their physical properties and chemical functions. In this study, the interlayer of a layered perovskite oxynitride was modified by H+/K+ exchange, ethylamine intercalation, and exfoliation-restacking. The ethylamine intercalated specimen showed significantly improved photocatalytic H-2 evolution activity, while the restacked nanosheets exhibited decreased activity. These findings suggest that ethylamine intercalation provided suitable interlayer nanospaces for Pt cocatalyst loading, promoting the photocatalytic reaction.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Daniele Padovan, Koichiro Endo, Takeshi Matsumoto, Toshiyuki Yokoi, Atsushi Fukuoka, Hideki Kato, Kiyotaka Nakajima
Summary: The acid-base properties of amphoteric crystalline YNbO4 are adjusted by impregnating phosphate groups, resulting in materials with increased activity and selectivity in glucose dehydration. The introduction of phosphate groups leads to the optimal catalyst, 5P-YNbO4, which exhibits 50% selectivity at 75% conversion. The catalyst can be deactivated due to carbon deposits, but its activity can be completely recovered through washing and calcination.
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)
