Article
Geochemistry & Geophysics
Fei Wang, Elizabeth C. Thompson, Dongzhou Zhang, Jingui Xu, Ercan E. Alp, Steven D. Jacobsen
Summary: This study investigates the deformation and hydrogen bonding structure of Wadsleyite crystal under high pressures, finding that pressure can affect crystal symmetry and structure distortion, as well as the length of the primary hydrogen bond. The primary O1-H hydrogen bond in Wadsleyite becomes highly nonlinear at high pressures.
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Nobuyoshi Miyajima, Johannes Buchen, Takaaki Kawazoe
Summary: Twins in hydrous wadsleyite were observed and characterized using microscopy techniques. The twins have a reduced symmetry compared to anhydrous wadsleyite. They are related to each other by rotations or reflections, corresponding to specific directions and planes in ringwoodite. The formation of twins is likely influenced by the presence of a hydrous fluid during crystal growth under quasi-hydrostatic conditions. This twinning may impact the physical properties, deformation behavior, and phase transition of wadsleyite in Earth's mantle transition zone.
AMERICAN MINERALOGIST
(2023)
Article
Geosciences, Multidisciplinary
Tingting Gu, Martha G. Pamato, Davide Novella, Matteo Alvaro, John Fournelle, Frank E. Brenker, Wuyi Wang, Fabrizio Nestola
Summary: This study reveals the nature and composition of the 660 km boundary between the mantle transition zone and lower mantle by analyzing mineral inclusions in a rare gem diamond from Botswana. The recovered lower-mantle minerals and hydrous phases found at this boundary suggest that the peridotitic composition and hydrous conditions extend across the transition zone and into the lower mantle.
Article
Geosciences, Multidisciplinary
Han Zhang, Brandon Schmandt, Wen-Yi Zhou, Jin S. Zhang, Ross Maguire
Summary: Olivine polymorphs are the most abundant minerals on Earth and play a vital role in the dynamics of the planet. Seismic discontinuities at depths of 410 and 660 km are attributed to phase transitions of olivine polymorphs and have been widely used in Earth models. However, the significance of the 520 km discontinuity and its causative phase transition are still debated. This study used receiver functions from over 2,000 seismographs across the U.S. to investigate the prevalence and properties of the 520 km discontinuity. The results show that the 520 km discontinuity is required for 84% of the area with a 95% confidence level, and its depths and S-velocity contrasts match predictions from the pyrolite model, indicating that it mainly reflects the wadsleyite to ringwoodite transition.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Dmitry Druzhbin, Hongzhan Fei, Tomoo Katsura
Summary: The mantle transition zone is considered a potential water reservoir due to high H2O solubility in minerals like wadsleyite and ringwoodite. Experiments showed that under reducing conditions, wadsleyite can store up to 1.0 wt.% of H2O with no significant effect from oxygen fugacity, and dissociation into H-2 and O-2 is negligible.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Chemistry, Analytical
Derrick C. Kaseman, Michael W. Malone, Aaron Tondreau, Michelle A. Espy, Robert F. Williams
Summary: This study investigates the quantitative analysis of nuclear magnetic resonance (NMR) at Earth's magnetic field, finding that the quantitation process at low magnetic fields is impacted by complex heteronuclear J-couplings, requiring consideration of instrumentation, acquisition, and processing methods. The re-derived constant field nuclear receptivity equation plays a key role in addressing strong coupling and quality factor effects, enabling the quantitation of homonuclear molecular groups in a simplified experimental system.
ANALYTICAL CHEMISTRY
(2021)
Article
Geochemistry & Geophysics
Wen-Yi Zhou, Zhiyuan Ren, Jin S. Zhang, Bin Chen, Ming Hao, Tomohiro Ohuchi, Lowell Miyagi, Dongzhou Zhang, Esen E. Alp, Barbara Lavina, Brandon Schmandt
Summary: This study focused on the high-pressure elasticity of hydrous Fe-bearing wadsleyite, analyzing the effects of pressure, water content, and Fe content on its intrinsic elastic anisotropy. The research found that the intrinsic elastic anisotropy of wadsleyite decreases with increasing pressure, water content, and Fe content.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Dmitry Druzhbin, Hongzhan Fei, Jialong Hao, Chi Zhang, Yangting Lin, Ralf Dohmen, Tomoo Katsura
Summary: In this study, the H2O-content dependence of Si self-diffusion coefficient in Fe-free wadsleyite was investigated. The results showed that H2O enhancement increased Si diffusion coefficient, and the addition of H2O reduced the rheological strength of wadsleyite. The viscosity in the mantle transition zone could be significantly reduced by H2O incorporation, which may control the evolution of plume shapes at 410-660 km depths.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Multidisciplinary Sciences
Daniel Blatter, Samer Naif, Kerry Key, Anandaroop Ray
Summary: Using experimentally constrained parameterization of mantle melting and Bayesian resistivity inversion, the study suggests that a mantle plume injected volatile-rich melts into the LAB channel. This may be a significant source of anomalies in the Earth's interior globally.
Article
Geochemistry & Geophysics
C. Tiraboschi, C. McCammon, A. Rohrbach, S. Klemme, J. Berndt, C. Sanchez-Valle
Summary: The role of hydrous silicate melts in transferring oxidized iron in subduction zones has been confirmed by experiments. The experiments showed high concentrations of FeO in the hydrous silicate melts, indicating the dominance of oxidized iron. The results also demonstrated that hydrous silicate melts can dissolve iron oxides more efficiently than aqueous fluids, playing a crucial role in oxidizing the source of arc magma.
GEOCHEMICAL PERSPECTIVES LETTERS
(2023)
Article
Geochemistry & Geophysics
Baohua Zhang, Chengcheng Zhao, Takashi Yoshino
Summary: Experimental results show that water content greatly enhances Fe-Mg interdiffusion rates in Wadsleyite, compared to Ringwoodite. However, the homogenization of chemical heterogeneity in the mantle through solid-state diffusion is very limited over geological time scales.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Merislava Anguelova, Manuela A. Fehr, Eiichi Takazawa, Maria Schoenbaechler
Summary: Titanium isotopes are a promising tracer for magmatic processes, and there are variations in titanium isotopes in mantle rocks. High heavy titanium isotopes might originate from metasomatism in the mantle wedge.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Multidisciplinary Sciences
Guoxiong Chen, Qiuming Cheng, Timothy W. Lyons, Jun Shen, Frits Agterberg, Ning Huang, Molei Zhao
Summary: In this study, an independent approach using machine learning and global geochemical data was employed to explore the changes in atmospheric oxygen levels over the past 4.0 billion years. The results show a two-step increase in atmospheric oxygen similar to previously published curves, but with additional, more detailed fluctuations. These findings suggest that the oxygenation of Earth's atmosphere may be partially attributed to mantle cooling and the evolution of mantle melts.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Wenzhong Wang, Zhongqing Wu
Summary: Using first-principles calculations, this study investigates the effect of water on the phase boundary between wadsleyite and ringwoodite in the mantle transition zone. The results show that water presence shifts the phase boundary to higher pressures and narrows the width of the two-phase coexistence domain. The presence of water also enhances the detectability of the 520 km seismic discontinuity.
AMERICAN MINERALOGIST
(2022)
Article
Chemistry, Physical
Ren-Hao Cheng, Honghao Cai, Yu-Ren Huang, Xiaohong Cui, Zhong Chen, Hsuan-Ying Chen, Shangwu Ding
Summary: Understanding the water state in Nafion is crucial for fuel cell operation and proton transport mechanism elucidation. By designing different types of Nafion samples with substituted cations, preparing samples carefully, and conducting solid state NMR experiments, clear and straightforward information can be obtained to reduce ambiguity in interpreting data. The results show that the type of substituting cation affects the unfrozen water in Nafion, and there is a broad distribution of water state and dynamics as the temperature decreases.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Review
Chemistry, Physical
Sharon E. Ashbrook, Russell Morris, Cameron M. Rice
Summary: This article discusses the use of solid-state NMR experiments in studying the development of new types of zeolites, as well as the application of 17O NMR spectroscopy in probing reactivity and understanding the behavior of zeolites in the presence of liquid water.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2022)
Article
Geochemistry & Geophysics
L. Eberhard, M. Thielmann, P. Eichheimer, A. Neri, A. Suzuki, M. Ohl, W. Fujita, K. Uesugi, M. Nakamura, G. J. Golabek, D. J. Frost
Summary: A new method to determine fluid flux at high pressures and temperatures has been developed and used to study serpentinites at subduction zone conditions. The experiments show that the amount and distribution of brucite can indicate fluid flow, and that small deviatoric stresses can cause anisotropic fluid flux.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Chemistry, Inorganic & Nuclear
Mazlina Musa, Daniel M. Dawson, Russell E. Morris, E. Sharon Ashbrook
Summary: In this study, FeAPO-34 with a chabazite structure was successfully synthesized, and the presence of iron in the material was confirmed by solid-state NMR spectroscopy.
INORGANIC CHEMISTRY
(2022)
Review
Geochemistry & Geophysics
Nicki C. Siersch, Giacomo Criniti, Alexander Kurnosov, Tiziana Boffa Ballaran, Zhaodong Liu, Takayuki Ishii, Daniel J. Frost, Tony Yu, Yanbin Wang
Summary: In this study, the crystal chemistry of MgSiO3-Al2O3 solid solution was investigated using single-crystal X-ray diffraction. The results showed a strong nonlinear behavior of the a- and c-axes as a function of Al content, indicating different accommodation mechanisms in akimotoite and corundum structures. High-pressure experiments also revealed that Al2O3 content affects the compression behavior of akimotoite, with increased compressibility as Al is incorporated into the SiO6 octahedron.
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Sumith Abeykoon, Vera Laurenz, Daniel J. Frost, Nobuyoshi Miyajima, Catherine McCammon
Summary: The factors controlling the oxygen content of sulphide melts in the upper mantle were investigated using equilibration experiments with mantle peridotite assemblages. The study found that variations in sulphur/metal cation ratio and oxygen fugacity did not significantly affect the sulphide melt oxygen content. Instead, the main controls on oxygen content were the silicate FeO contents, temperature, and pressure. Nickel was found to lower the oxygen content, but its effect was difficult to separate from other variables.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Materials Science, Multidisciplinary
C. Melai, T. Boffa Ballaran, L. Uenver-Thiele, A. Kurnosov, A. I. Chumakov, D. Bessas, D. J. Frost
Summary: In this study, the compressibility of high-pressure magnesioferrite and an intermediate Mg0.5Fe0.52+Fe23+O4 sample were investigated using single-crystal X-ray diffraction. The obtained data contributes to the calculation of the thermodynamic properties of high-pressure mixed valence iron oxides.
PHYSICS AND CHEMISTRY OF MINERALS
(2023)
Article
Geochemistry & Geophysics
Lisa Eberhard, Oliver Pluemper, Daniel J. J. Frost
Summary: We conducted high-pressure experiments to investigate the influence of carbon-bearing phases on fluid release in subducted serpentinites. It was found that the addition of CaCO3 can lower the dehydration temperature and the stability of serpentine in a serpentinite assemblage. However, this reaction does not significantly decrease the proportion of carbonate.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Laura J. Crisp, Andrew J. Berry, Antony D. Burnham, Laura A. Miller, Matthew Newville
Summary: The Ti content in zircon can be used as a geothermometer. The coordination of Ti in zircon changes with pressure, and it is important to determine the pressure in order to accurately estimate the temperature at which zircon crystallizes. A new model has been developed to improve the accuracy of estimating zircon crystallization temperatures based on the Ti content.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
Takayuki Ishii, Daniel J. Frost, Eun Jeong Kim, Artem Chanyshev, Keisuke Nishida, Biao Wang, Rintaro Ban, Jianing Xu, Jin Liu, Xiaowan Su, Yuji Higo, Yoshinori Tange, Ho-kwang Mao, Tomoo Katsura
Summary: Mantele convection drives surface processes and chemical evolution, and phase transitions of minerals impact density and viscosity. Accurately determining the slopes of phase boundaries is crucial for understanding mantle dynamics.
Article
Chemistry, Multidisciplinary
Daniel J. Davidson, Fei Lu, Laura Faas, Daniel M. Dawson, Geoffrey P. Warren, Isabella Panovic, James R. D. Montgomery, Xiaoyan Ma, Boris G. Bosilkov, Alexandra M. Z. Slawin, Tomas Lebl, Afroditi Chatzifragkou, Steve Robinson, Sharon E. Ashbrook, Liz J. Shaw, Smilja Lambert, Isabella Van Damme, Leonardo D. Gomez, Dimitris Charalampopoulos, Nicholas J. Westwood
Summary: Cocoa pod husks, an underutilized resource in chocolate manufacturing, contain lignin with potential applications. An optimized extraction method led to high-quality lignin, allowing for further investigation of its structure and chemical transformation abilities. Preliminary analysis of other product streams from the husks was also conducted.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Zachary H. Davis, Russell E. Morris, Sharon E. Ashbrook
Summary: A mixed-metal metal-organic framework, (Al,Ga)-MIL-53, was studied using solid-state nuclear magnetic resonance (NMR) spectroscopy, microscopy and energy dispersive X-ray (EDX) spectroscopy to investigate the ion exchange process. Two ion-exchange processes were explored, revealing the formation of core-shell structure and clustering of like cations. This study provides valuable insights into the metal distribution in (Al,Ga)-MIL-53 materials.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Alexander J. R. Thom, Gemma F. Turner, Zachary H. Davis, Martin R. Ward, Ignas Pakamore, Claire L. Hobday, David R. Allan, Mark R. Warren, Wai L. W. Leung, Iain D. H. Oswald, Russell E. Morris, Stephen A. Moggach, Sharon E. Ashbrook, Ross S. Forgan
Summary: Postsynthetic modification of metal-organic frameworks (MOFs) has proven to be a powerful tool for tuning physical properties and introducing functionality. In this study, we demonstrated the substitution of labile μ(2)-OH ligands in a specific MOF with μ(2)-OCH3 units through reaction with methanol molecules, induced by pressure. The unexpected reactivity of MOF SBUs has implications for a range of applications, from catalysis to chemical stability.
Article
Chemistry, Physical
Edoardo Fusco, Sharon E. Ashbrook, Michael Buhl
Summary: In this study, DFT predictions were made for the paramagnetic Nuclear Magnetic Resonance (pNMR) spectra of small molecular models based on the Cu(ii)-paddlewheel dimer motif found in metal-organic frameworks (MOFs). Potential point defects with spin-1/2 were explored through electron paramagnetic resonance (EPR) experiments. Defects were considered through substitution of one Cu(ii) center with protons or through one-electron reduction, resulting in a mixed-valence dimer. While most defects had similar pNMR shifts to non-defective MOFs at room temperature, their detection and identification could be achieved based on their distinct temperature dependence.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Zachary H. Davis, Emma A. L. Borthwick, Russell E. Morris, Sharon E. Ashbrook
Summary: This paper presents a study on the mixed-metal MOFs (Al,Sc)-MIL-53 using DFT computational analysis. The results show that NMR parameters can be used to differentiate and characterize the different forms of mixed-metal MOFs with different composition, and these parameters can also be correlated with structural features. This study provides important insights into the nature and origin of the interactions that affect nuclear spins.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Environmental Sciences
Joseph Knafelc, Scott E. Bryan, Michael W. M. Jones, David Gust, Guil Mallmann, Henrietta E. Cathey, Andrew J. Berry, Eric C. Ferre, Daryl L. Howard
Summary: Microanalytical investigation reveals that the pink and white pumice from the 2012 Havre deep-sea eruption experienced high-temperature atmospheric oxidation, suggesting a short but powerful explosive phase. The presence of pink pumice questions the existing effusive eruption model for the Havre raft.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Chemistry, Multidisciplinary
Alexander M. Prophet, Kritanjan Polley, Gary J. Van Berkel, David T. Limmer, Kevin R. Wilson
Summary: The oxidation kinetics of iodide by ozone at the air-water interface is studied in single microdroplets. Molecular simulations and kinetic modeling are used to understand the underlying multiphase mechanism.
Article
Chemistry, Multidisciplinary
Rong Zhang, Jiajing Lan, Fei Wang, Shumei Chen, Jian Zhang
Summary: By utilizing 1,1'-ferrocene dicarboxylic acid as a chelating and surface protection ligand, we have synthesized multi-nuclear indium oxide clusters with varying nuclear sizes, including heptanuclear and thirteen-nuclear clusters. These clusters possess labile coordination sites, allowing for structural modification and self-assembly, resulting in the formation of various cluster structures.
Article
Chemistry, Multidisciplinary
Hui Wang, Hui Liu, Mingsen Wang, Jiaheng Hou, Yongjun Li, Yuancheng Wang, Yingjie Zhao
Summary: Two supramolecular complexes were prepared using CBs and M1, and their single-crystal structures were analyzed by SCXRD. The unexpected 1:2 self-assembly structure between M1 and CB[8] was discovered for the first time. These complexes exhibit unique photophysical properties and provide valuable information about the structure and photophysical properties of supramolecular complexes.
Article
Chemistry, Multidisciplinary
Chang-Hee Lee, Sookil Park, Sanggil Kim, Ji Young Hyun, Hyun Soo Lee, Injae Shin
Summary: The epidermal growth factor receptor (EGFR) is a cell-surface glycoprotein involved in cell proliferation and tumor development. This study used a fluorescently labeled EGFR to investigate its time-dependent endocytosis in live cells and found that appended glycans affect EGFR internalization. Additionally, the study detected sialic acid residues attached to EGFR on the live cell surface using FRET-based imaging. This research provides valuable insights into the cellular functions of EGFR.
Article
Chemistry, Multidisciplinary
Subhankar Sahu, Lokesh Kumar, Sumita Das, Dipti Gupta, Ruchi Anand
Summary: This study proposes a strategy that combines organic electronics with biosensor scaffolds to create a compact device for monitoring environmental aromatic pollution. By coupling biosensing protein MopR with an organic electrochemical transistor (OECT), a sensor module capable of efficient detection of phenol was designed. Exclusive phenol detection with minimal loss of sensitivity could be achieved in complex pollutant mixtures and real environmental samples.
Review
Chemistry, Multidisciplinary
Changseok Lee, Hyung-Joon Kang, Sungwoo Hong
Summary: The formation of C-N bonds through hydroamination reactions catalyzed by nickel hydrides has been a topic of recent interest. This approach offers a way to efficiently transform a variety of alkene and alkyne substrates into compounds enriched with C-N bonds. The review provides a concise overview of the underlying reaction mechanisms and aims to stimulate further progress in NiH-catalytic techniques and catalyst design.
Article
Chemistry, Multidisciplinary
Yueci Wu, Lu-Lu Sun, Hai-Hao Han, Xiao-Peng He, Weiguo Cao, Tony D. James
Summary: Drug-induced liver injury (DILI) is a common cause of acute liver failure in the USA and Europe, but most cases can be recovered or prevented by discontinuing the offending drug. Recent research has found that peroxynitrite (ONOO-) can be used as a potential indicator for early diagnosis of DILI, and there is an urgent need to establish a method to detect and track peroxynitrite in DILI cases. In this study, a FRET-based nano fluorescent probe CD-N-I was developed, which showed high selectivity and sensitivity in detecting peroxynitrite. The probe successfully detected exogenous peroxynitrite in live cells and endogenous peroxynitrite in APAP-induced liver injury of HepG2 cells.
Article
Chemistry, Multidisciplinary
Dmitry L. Lipilin, Mikhail O. Zubkov, Mikhail D. Kosobokov, Alexander D. Dilman
Summary: This article describes a direct photocatalytic method for the thiolation of unprotected acids, which was previously challenging. By using a thionocarbonate reagent with an N-O bond, the efficient conversion of carboxylic acids to thiols is achieved.
Article
Chemistry, Multidisciplinary
Jason Malenfant, Lucille Kuster, Yohann Gagne, Kouassi Signo, Maxime Denis, Sylvain Canesi, Mathieu Frenette
Summary: Raman microscopy can reveal compound-specific vibrational fingerprints without sample preparation. The combination of efficient theoretical calculations and a user-friendly software can accurately predict peak positions and provide match scores to assist with structure determination.
Article
Chemistry, Multidisciplinary
Jayoh A. Hernandez, Paul S. Micus, Sean Alec Lois Sunga, Luca Mazzei, Stefano Ciurli, Gabriele Meloni
Summary: Essential trace metals play crucial roles in the survival and virulence of bacterial pathogens. Helicobacter pylori requires nickel for colonization and persistence in the stomach, and NixA is an essential nickel transporter in this process. This study characterizes the selectivity and electrogenic nature of NixA-mediated nickel transport.
Article
Chemistry, Multidisciplinary
Tarali Devi, Kuheli Dutta, Jennifer Deutscher, Stefan Mebs, Uwe Kuhlmann, Michael Haumann, Beatrice Cula, Holger Dau, Peter Hildebrandt, Kallol Ray
Summary: This study emphasizes the importance of subtle electronic changes and secondary interactions in the stability of biologically relevant metal-dioxygen intermediates. It also shows that the role of the chloride ligand in stabilizing the Fe-III-(OOBu)-Bu-t moiety can extend to other anions, including the thiolate ligand.
Article
Chemistry, Multidisciplinary
Jacqueline R. Santhouse, Jeremy M. G. Leung, Lillian T. Chong, W. Seth Horne
Summary: By studying the folding kinetics and mechanism of the BdpA sequence, researchers found that altering the backbone connectivity can affect protein folding. This suggests that protein mimetic chains have a significant degree of plasticity in transitioning between unfolded and folded states.
Article
Chemistry, Multidisciplinary
Divanshu Gupta, Ralf Einholz, Holger F. Bettinger
Summary: This study presents the first direct spectroscopic evidence of a cyclic seven-membered iminoborane. Compared to linear amino-iminoboranes, this cyclic iminoborane exhibits weakened bond strength and lower Lewis acidity value. The study suggests that the reduced ring strain of cyclic iminoborane prevents nitrogen fixation but allows facile (2 + 2) cycloaddition reaction with C2H4.
Article
Chemistry, Multidisciplinary
Renny Mathew, Aniruddha Mazumder, Praveen Kumar, Julie Matula, Sharmarke Mohamed, Petr Brazda, Mahesh Hariharan, Brijith Thomas
Summary: This study reveals the packing arrangement of partially disordered nitro-perylenediimide (NO2-PDI) using a synergistic approach that combines 3D ED, ssNMR, and DFT techniques. By overcoming these challenges, this methodology opens up new avenues for material characterization, driving exciting advancements in the field.