Article
Biotechnology & Applied Microbiology
Josef Licek, Mojmir Baron, Jiri Sochor, Michal Kumsta, Jiri Mlcek
Summary: This study focused on the application of a patented medium-chain fatty acids mixture at the end of alcoholic fermentation and monitored its residues. The results showed that the use of the investigated mixture at doses of 10 and 20 mg/L did not have a negative impact on the quality and sensory properties of the wine, making it a safe alternative.
FERMENTATION-BASEL
(2022)
Article
Chemistry, Physical
Keaten Kappes, Benjamin N. Frandsen, Veronica Vaida
Summary: This study investigates the vibrational spectra of Alpha-keto acid 2-oxo-octanoic acid (2OOA) in different phases. Two different conformers are identified in the gas phase, and an intermolecular hydrogen bonding scheme is proposed for the solid phase. At the air-water interface, hydrocarbon tails interact with each other, while carbonyls interact with water but not with neighboring molecules.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nutrition & Dietetics
Christina Heidt, Manfred Fobker, Mary Newport, Reinhold Feldmann, Tobias Fischer, Thorsten Marquardt
Summary: This single-center study investigated the impact of consuming carbohydrate as glucose with MCT oil compared to MCT alone on the BHB response. The results showed that consuming MCT oil alone significantly increased BHB levels, while consuming MCT oil with glucose delayed the peak of BHB and led to increased blood glucose and insulin levels.
Article
Chemistry, Multidisciplinary
Ashley J. Winter, Matthew T. Rowe, Angus N. M. Weir, Nahida Akter, Sbusisiwe Z. Mbatha, Paul D. Walker, Christopher Williams, Zhongshu Song, Paul R. Race, Christine L. Willis, Matthew P. Crump
Summary: In this study, the remaining steps of 9HN biosynthesis were investigated using NMR spectroscopy, mass spectrometry, chemical probes, and in vitro assays. The results reveal a complex interplay between multiple acyl carrier proteins and a novel KS-AT didomain.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Miguel de la Puente, Rolf David, Axel Gomez, Damien Laage
Summary: The acidity at the air-water interface decreases compared to the bulk, but is higher below the interface. This has important implications for environmental and biochemical processes.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Analytical
Cornel Banita, Oana Arina Antoce, George Adrian Cojocaru
Summary: Medium-chain fatty acids can be used for the production of naturally sweet wines by inhibiting the growth and fermentation of yeasts. Adding octanoic acid, decanoic acid, or their combinations can stop alcoholic fermentation and reduce the need for sulfur dioxide addition. The effect of these acids on the aroma profile of sweet wines was evaluated using a chromatographic electronic nose, which showed easily distinguishable differences between wines treated with octanoic and decanoic acids. The doses, type of acid, and yeast used during fermentation all influence the volatile profiles of the wines.
Article
Geosciences, Multidisciplinary
Sudip Chakraborty, Bin Guan, Duane E. Waliser, Arlindo M. da Silva, Sophie Uluatam, Peter Hess
Summary: Despite gaps in our knowledge on aerosol long-range transport, this study develops a global algorithm to detect aerosol atmospheric rivers (AARs), showing their significant contributions to global aerosol transport pathways and their impact on regional air quality conditions.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Yi-Bo Zhao, Tianyu Cen, Fuze Jiang, Weidong He, Xiaole Zhang, Xiaoxiao Feng, Min Gao, Christian Ludwig, Eric Bakker, Jing Wang
Summary: This study proposes a concept of aerosol-into-liquid capture and detection, which enables the one-step capture and detection of airborne soluble metals. This method can be used for air quality monitoring, especially during abrupt air pollution events with high concentrations of airborne metals.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Multidisciplinary
Shendong Tan, Xiaomeng Zhang, Yongjian Lian, Xi Chen, Shi Yin, Lin Du, Maofa Ge
Summary: Organosulfates (OSs) are commonly found in atmospheric aerosol particles and their formation mechanism is crucial to understand. This study investigates the reaction of alpha-hydroxy acids (HAs) with SO3 at the surface of liquid aerosols, revealing the significant impact of OH group orientation on the formation of OSs. The air-water interface plays a crucial role in the physicochemical behaviors of alpha-hydroxy acids, leading to different properties for the SO3 colliding reaction.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Environmental Sciences
Ren-Guo Zhu, Hua-Yun Xiao, Li Luo, Hongwei Xiao, Zequn Wen, Yuwen Zhu, Xiaozheng Fang, Yuanyuan Pan, Zhenping Chen
Summary: This study investigated the sources and processing history of different sizes of particles in the atmosphere using compound-specific delta N-15 patterns, delta N-15 values, DI, and Σ(V). Results showed that the average concentrations of THAA in fine particles were significantly higher than that in coarse particles, with composition profiles differing between the two. Additionally, the delta N-15 values of hydrolyzed glycine and THAA in both fine and coarse particles were consistent with those from biomass burning, soil, and plant sources.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Multidisciplinary Sciences
Yuanzhou Huang, Fabian Mahrt, Shaun Xu, Manabu Shiraiwa, Andreas Zuend, Allan K. Bertram
Summary: Individual atmospheric particles can contain mixtures of primary organic aerosol (POA), secondary organic aerosol (SOA), and secondary inorganic aerosol (SIA), with the potential to have three distinct liquid phases. The presence of these phases is influenced by the elemental oxygen-to-carbon (O:C) ratio of the SOA, impacting equilibration timescales and potential effects on cloud formation and atmospheric chemistry.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Physical
Raphael da Silva Alvim, Caetano Rodrigues Miranda
Summary: In this study, first-principles calculations were used to determine the adsorption energy of propanoic and octanoic acids on calcite and dolomite surfaces under low salinity water conditions. The results showed that the adsorption selectivity of acidic oil components was lower on magnesium sites, while calcium sites retained the acid molecules more effectively. The influence of the carbonate surfaces was enhanced in the presence of an aqueous environment. Additionally, the aqueous environment may predominantly affect the unoccupied electronic levels of dolomite carbonate sites, resulting in a stronger interaction with the acid molecules. The size of the acid chain had a less pronounced effect. The desorption of the acid molecules could occur from the carbonate sites, especially in dolomite, due to increased surface hydrophilicity and favorable ionic exchange and water adsorption. Overall, these simulation models provide important insights into the interaction properties of complex water-oil-carbonate interfaces under low salinity water conditions for enhanced oil recovery.
APPLIED SURFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Longshan Qin, Weilei Yao, Tongxin Wang, Taimin Jin, Baoyin Guo, Shu Wen, Feiruo Huang
Summary: This study found that butyrate produced by gut microbiota affects hepatic gluconeogenesis in late-pregnancy sows through the cAMP-PKA-GCN5 pathway. Modulating the production of butyrate by gut microbiota can improve reproductive performance and serum glucose metabolism index in sows.
Article
Engineering, Environmental
Fabian Mahrt, Elli Newman, Yuanzhou Huang, Markus Ammann, Allan K. Bertram
Summary: The research found that internal mixtures of POA and SOA in the atmosphere almost always formed two phases when the O/C ratio of the POA was less than 0.11. When the O/C ratio of the POA was between 0.11 and 0.29, the mixtures mostly resulted in particles with one liquid phase. However, depending on the types of SOA and POA surrogates, two liquid phases were also observed in some cases, and an increase in phase-separated particles was observed when increasing the relative humidity within this O/C range.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Biochemical Research Methods
Yongjoo Lee, Chandran Sathesh-Prabu, Geun Hwa Kwak, Ina Bang, Hyun Wook Jung, Donghyuk Kim, Sung Kuk Lee
Summary: In this study, whole-cell biotransformation was used to produce nonanedioic acid from nonanoic acid by expressing the alkane hydroxylating system from Pseudomonas putida. An efficient E. coli mutant strain, MRE, was obtained through adaptive laboratory evolution, showing significantly increased growth on nonanoic acid and enhanced nonanedioic acid production. Six beneficial mutations were identified in the MRE strain, which contributed to its rapid growth and improved nonanedioic acid production.
BIOTECHNOLOGY JOURNAL
(2022)
Article
Electrochemistry
Tehseen Adel, Juan Velez-Alvarez, Anne C. Co, Heather C. Allen
Summary: Surface potential measurement values at gas-liquid interfaces can be ambiguous due to lack of standardization in calibration and normalization methods. The proposed circuit model based on americium-241 demonstrates reliability in quantifying surface potential. Validation with surface tension measurements further confirms the accuracy of the ionizing method.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Analytical
Abigail A. Enders, Nicole M. North, Chase M. Fensore, Juan Velez-Alvarez, Heather C. Allen
Summary: This study develops a generalizable model using machine learning algorithm with convolutional neural networks to identify functional groups in gas-phase FTIR spectra, reducing analysis time and facilitating interpretation. The model successfully trains for 15 common organic functional groups, expanding the application of FTIR measurements for easy analysis of organic samples. The approach utilizes image-based CNNs for predicting functional groups, marking the first implementation of ML in this area.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Tehseen Adel, Ka Chon Ng, Maria G. Vazquez de Vasquez, Juan Velez-Alvarez, Heather C. Allen
Summary: This study examines the impact of aqueous inorganic ions on the air-aqueous interface electric field using the ionizing surface potential technique. It evaluates aqueous ion surface potentials relative to well-known ionic surfactants and explores factors impacting measured surface potentials. Results show iodide significantly affects the electric field, causing a net negatively charged surface, while bromide also exhibits this effect at higher concentrations.
Article
Chemistry, Multidisciplinary
Mickey M. Rogers, Maria G. Vazquez de Vasquez, Jennifer F. Neal, Mia M. Zerkle, Brittany M. Shook, Heather C. Allen
Summary: In order to understand the complex interactions of marine organics at the surface of sea spray aerosols (SSAs), thermodynamic parameters are needed for atmospheric models. Traditional surface studies using Langmuir films have limitations in obtaining thermodynamic properties. Researchers have developed a new experimental method to capture the thermodynamic values of marine relevant substances by changing the temperature and sodium chloride concentration. This study provides important data for the phase-state transition of organic coatings and has implications for climate models and global understanding of SSA interfaces.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Maria G. Vazquez de Vasquez, Mickey M. Rogers, Kimberly A. Carter-Fenk, Heather C. Allen
Summary: This study expands upon the understanding of the mechanisms of saccharide enrichment in marine aerosols by investigating the co-adsorption of alginate and glucuronate. The study reveals significant differences in the co-adsorption mechanism between these two saccharides, with alginate forming multilayers beneath the monolayer and glucuronate inducing reorganization within the monolayer. The study provides important parameters for better representation of saccharides in marine aerosol investigations.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Abigail A. Enders, Scott M. Elliott, Heather C. Allen
Summary: The sea surface nanolayer (SSnL) is a unique region between the atmosphere and ocean enriched with lipids and proteins that affect the ocean's surface chemistry. In this study, we estimate carbon in the SSnL using a global analysis that incorporates organic surfactant dynamics. Our results show significant monthly variability and global differences among carbon averages, indicating the organic geochemical diversity of the ocean surface. Although our estimates are limited due to lack of data, they can serve as a benchmark for future studies. This study provides the first example of planetary-scale integrations of SSnL organic carbon.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Chemistry, Physical
Lin Wang, Akihiro Morita, Nicole M. North, Stephen M. Baumler, Elliot W. Springfield, Heather C. Allen
Summary: This work summarizes a theoretical analysis of how Raman spectra in aqueous NaCl and KCl solutions are perturbed by ion pairs. The experimental results show that polarized and depolarized Raman spectra are similarly affected by these ions, with KCl causing slightly less perturbation than NaCl. This is contrary to molecular dynamics simulations, which predict that the isolated ions of KCl should cause greater perturbation than NaCl due to the larger solvation shell of K+. The discrepancy suggests that ion pair formation is more substantial for KCl than NaCl. MD simulations and quantum chemical calculations confirm that KCl forms more ion pairs than NaCl, and that ion pair formation reduces the perturbation on Raman spectra to a greater extent for KCl. The findings demonstrate that perturbed Raman spectra can serve as a useful indicator for evaluating ion pair formation in aqueous solutions.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Multidisciplinary
Abigail A. Enders, Jessica B. Clark, Scott M. Elliott, Heather C. Allen
Summary: The chemistry and structure of the air-ocean interface play important roles in biogeochemical processes and climate. Protein macromolecules in the sea surface have unique adsorption properties due to their molecular balance of hydrophobicity and hydrophilicity. This study investigates the dynamic surface behavior of proteins using bovine serum albumin as a model protein under different conditions. The results reveal the nuanced behavior of protein adsorption influenced by ocean-relevant sodium concentrations and the synergistic effects of divalent cations and increased temperature.
Article
Chemistry, Physical
Kamal K. K. Ray, Aditya Limaye, Ka Chon Ng, Ankur Saha, Sucheol Shin, Biswajit Biswas, Marie-Pierre Gaigeot, Simone Pezzotti, Adam P. P. Willard, Heather C. C. Allen
Summary: We conducted a study on the response of the neat liquid water-air interface to changes in an external electrode's potential using second-harmonic generation (SHG), molecular dynamics simulation, and theoretical modeling. The results show a parabolic relationship between second harmonic intensity and the applied potential. Our findings suggest that traditional continuum-based models of interfacial screening are not sufficient to describe the potential profile of the liquid water-vapor interface, as the electric fields within the diffuse layer were found to be opposite in sign. Effects such as overscreening in the topmost interfacial layer and extended correlations in the interfacial hydrogen-bonding network may be crucial in determining the water interface's response to external fields.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Nicole M. North, Abigail A. Enders, Morgan L. Cable, Heather C. Allen
Summary: Mass spectrometry is a technique widely used for complex chemical analysis. Artificial intelligence methods, specifically CNN models and logistic regression models, have been trained on mass spectra data to identify functional groups. Logistic regression models demonstrated higher accuracy in identifying new data, and the mass range of 0-100 m/z was found to be most beneficial for functional group analysis.
Article
Chemistry, Physical
Jessica B. Clark, Tai Bowling-Charles, Shamma Jabeen Proma, Biswajit Biswas, David T. Limmer, Heather C. Allen
Summary: This study investigates the structural changes in propylene carbonate (PC) caused by the addition of water using polarized Raman spectroscopy and molecular dynamics simulations. The results reveal that water tends to self-aggregate in PC, forming a hydrogen bond network that becomes more pronounced with increasing concentration.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jessica B. Clark, Tai Bowling-Charles, Shamma Jabeen Proma, Biswajit Biswas, David T. Limmer, Heather C. Allen
Summary: In this study, the structural changes that occur as water is added to propylene carbonate (PC) were investigated using polarized Raman spectroscopy and molecular dynamics simulations. It was observed that water tends to self-aggregate in PC, forming a distinct hydrogen bond network, and the degree of water aggregation increases with the concentration of PC.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Abigail A. Enders, Scott M. Elliott, Heather C. Allen
Summary: In this study, carbon in the sea surface nanolayer (SSnL) was calculated and examined using a global analysis that incorporates organic surfactant dynamics. The results show monthly variability and global differences in the organic geochemistry of the ocean surface, but the total mass of carbon does not change significantly throughout the year.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Liwei Yan, Ankur Saha, Wei Zhao, Jennifer F. Neal, Yusheng Chen, Amar H. Flood, Heather C. Allen
Summary: This study investigates the role of ion binding and ion hydration in the self-assembly of cyanosurf molecules at aqueous interfaces. The results show that ion binding triggers the self-organization of cyanosurf into monolayers at the water-air interface, and hydration affects the binding and ordering of the interface.
Article
Chemistry, Physical
Kimberly A. Carter-Fenk, Abigail C. Dommer, Michelle E. Fiamingo, Jeongin Kim, Rommie E. Amaro, Heather C. Allen
Summary: The study demonstrates that the marine polysaccharide alginate co-adsorbs with a insoluble palmitic acid monolayer through divalent cationic bridging interactions, with calcium ions inducing the greatest extent of co-adsorption. The presence of magnesium ions only facilitates a third of the co-adsorption due to strong hydration propensity. Surface pressure has minimal impact on the amount of alginate co-adsorption.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
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)