Article
Energy & Fuels
Yewen Tan, Jarrett Riley, Dennis Lu, Ranjani Siriwardane, Robin Hughes
Summary: The reduction and oxidation kinetics of a CuFeMnAlO4+δ oxygen carrier for methane were investigated using atmospheric and pressurized TGAs, with important parameters such as temperature, particle size distribution, and partial pressures of reactants evaluated. The results showed that the reduction of the oxygen carrier was not affected by particle size distribution, and the temperature's effect on the reduction diminished above 750°C. The reaction time approached an asymptotic limit as methane partial pressure increased. The oxidation rate of the oxygen carrier increased with higher oxygen concentration, especially when the concentration was below 7.5%.
Article
Energy & Fuels
Yewen Tan, Jarrett Riley, Dennis Lu, Ranjani Siriwardane, Robin Hughes
Summary: The reduction and oxidation kinetics of a CuFeMnAlO4+delta oxygen carrier for methane were studied. Important parameters such as temperature, particle size distribution, and partial pressures of reactants were evaluated. Results showed that particle size distribution did not affect the reduction of the oxygen carrier, and the temperature had less effect on the reduction at temperatures above 750 degrees C. The rate of oxidation increased with increasing oxygen concentration, and the effect was more noticeable at oxygen concentrations below 7.5%. Additionally, a shrinking sphere model was used to model the test data, and the limitations of the pressurized TGA were discussed.
Article
Chemistry, Inorganic & Nuclear
Xiaoben Zhang, Chuanchuan Jin, Shaobo Han, Peiyao Guo, Yan Zhou, Wei Liu, Wenjie Shen
Summary: The atomic structure of the Fe3O4/α-Fe2O3 interface during the phase transition from hematite to magnetite was studied. Experimental observation and HRTEM simulation identified a unique polyhedral model, where Fe3O4(111) epitaxially grows along α-Fe2O3(0001) with an aligned orientation of [112]Fe3O4 ||[112 0]α-Fe2O3. Understanding the atomic rearrangement and dynamic behavior of phase transition is important for the functionalities of iron oxides in various applications.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Christian Iwanov, Moritz Philipp Hopp, Domenik Lorenz, Joachim Ballmann, Markus Enders
Summary: Iron ions in a square-planar coordination have the ability to bind and transform molecules, making them important for stoichiometric and catalytic reactions. This research successfully studied the interaction between iron ions and surrounding ligands, as well as their catalytic activity in oxidation-reduction reactions, using a phthalocyanine derivative.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Astronomy & Astrophysics
David C. Cantillo, Vishnu Reddy, Benjamin N. L. Sharkey, Neil A. Pearson, Juan A. Sanchez, Matthew R. M. Izawa, Theodore Kareta, Tanner S. Campbell, Om Chabra
Summary: The largest M-type asteroid Psyche was originally thought to be metallic, but recent research suggests it also contains low-Fe pyroxene and carbonaceous chondrite on its surface. Laboratory experiments show that the best matching mixture to Psyche consists of 82.5% metal, 7% low-Fe pyroxene, and 10.5% carbonaceous chondrite by weight. This implies a porosity of 35% in Psyche to match recent density estimates.
PLANETARY SCIENCE JOURNAL
(2021)
Article
Multidisciplinary Sciences
Chung Phuong Le, Hai Thi Nguyen, Toi Duy Nguyen, Quyen Huynh Minh Nguyen, Hai The Pham, Hang Thuy Dinh
Summary: This study investigated a process of ammonium oxidation under ferric-iron reducing condition (feammox) in a laboratory-scaled system, showing high removal efficiencies for NH4+ and COD under specific conditions. It also revealed that gamma-proteobacteria dominated in the microbial community attached to the system matrix bed.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Environmental
Maya Engel, Vincent Noel, Samuel Pierce, Libor Kovarik, Ravi K. Kukkadapu, Juan S. Lezama Pacheco, Odeta Qafoku, J. Ray Runyon, Jon Chorover, Weijiang Zhou, John Cliff, Kristin Boye, John R. Bargar
Summary: Fe-rich mobile colloids are important but poorly understood in the biogeochemical cycling of Fe in groundwater. This study provides comprehensive information on the sizes, molecular structures, and compositions of Fe-rich mobile colloids in anoxic groundwater from a redox-active floodplain. The mobile colloids consist of Si-coated ferrihydrite nanoparticles and Fe(II)-OM complexes, which can persist under both oxic and anoxic conditions. These findings shed new light on the potential of mobile Fe-rich colloids to transport Fe, OM, and nutrients across terrestrial-aquatic interfaces.
Article
Chemistry, Multidisciplinary
Xiaoyu Zhang, Xingchen Guo, Haoxiang Wang, Renke Kang, Shang Gao
Summary: In this study, a new photoassisted chemical mechanical polishing method was developed to improve the processing quality of YAG crystals. The use of a specific polishing slurry and ultraviolet light irradiation resulted in higher material removal rate and smoother surface roughness.
Article
Biotechnology & Applied Microbiology
Jianrong Huang, Mingxian Han, Jian Yang, Andreas Kappler, Hongchen Jiang
Summary: NRFeOx microorganisms are widely distributed and play an important role in iron transformation, nitrate, and heavy metal removal in various environments. However, their identity and activity under hypersaline conditions are still unknown. In this study, we analyzed the abundance and community compositions of NRFeOx microorganisms from five lake sediments with different salinities. The results showed that the abundance of NRFeOx microorganisms decreased with increasing salinity, and the community compositions varied among different lakes and were closely related to lake salinity.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Environmental Sciences
Xi Yang, Qingjun Guo, Valeria Boyko, Khoren Avetisyan, Alyssa J. Findlay, Fang Huang, Zhongliang Wang, Zhenwu Chen
Summary: This study focuses on Sihailongwan Lake and examines the record of iron isotope fractionation in sedimentary rock, demonstrating the usefulness of iron isotopes from modern natural environments in reconstructing iron oxidation-reduction processes during Earth's early history.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Inorganic & Nuclear
Lin-Feng Yang, Hai-Gang Qin, Fu-Zhi Li, Jian-Zhao Peng, Jun Gu
Summary: Electrochemical reduction of nitrate driven by intermittent renewable electricity is a promising approach for water treatment. Adding a supporting electrolyte or anchoring cationic sites on catalysts are effective strategies to facilitate nitrate reduction in low ionic strength solutions.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Wooseok Kang, Ahyun Lee, Yoonjin Tae, Byeongseung Lee, Jin-sil Choi
Summary: The effect of metal salts on the formation and catalytic activity of carbon dots is investigated in this study. Metal doping and nitrogen incorporation in the carbon dots enhance their catalytic effect. The Mn and N-doped carbon dots can sensitively respond to interference factors in enzymatic reactions, enabling the successful monitoring of ascorbic acid. This research provides insight into the formation and controllable catalytic properties of carbon dots, offering guidance for their industrial applications.
Article
Microbiology
Hayley J. Gadol, Joseph Elsherbini, Benjamin D. Kocar
Summary: This research investigates the impact of different iron oxide minerals on microbial methane production and community development. It shows that only poorly crystalline iron oxide mineral, ferrihydrite, has a significant effect on iron reduction and microbial community composition. The presence of ferrihydrite continues to influence microbial community development even after the onset of methanogenesis, leading to increased dissimilarity compared to control groups.
FRONTIERS IN MICROBIOLOGY
(2022)
Review
Chemistry, Applied
Giovanni Maria Fusi, Silvia Gazzola, Umberto Piarulli
Summary: Transition metal chiral catalysts can have metal stereocenters in different coordination geometries, with stability achieved through the use of multidentate ligands or cyclopentadienyl anions to prevent decomplexation and recomplexation of labile ligands, allowing for highly enantioselective reactions.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Energy & Fuels
Zhende Zhai, Hongchao Yin
Summary: In this study, cement bonded fine hematite particles and carbide slag were used as oxygen carrier for chemical looping combustion. The experiments compared undecorated iron ore and carbide slag decorated iron ore, and found that the CCIO oxygen carrier exhibited better and stable reactivity. Further investigation with bituminous coal as fuel showed that CCIO20 outperformed undecorated iron ore. The physical and chemical properties analysis revealed that the newly formed phase Ca2Al2SiO7 in CCIO20 contributed to its enhanced reactivity.
Article
Geochemistry & Geophysics
Zoe E. Wilbur, Arya Udry, Francis M. McCubbin, Kathleen E. vander Kaaden, Christopher DeFelice, Karen Ziegler, Daniel Kent Ross, Timothy J. McCoy, Juliane Gross, Jessica J. Barnes, Nick Dygert, Ryan A. Zeigler, Brent D. Turrin, Christopher McCoy
Summary: Enstatite-rich meteorites, including aubrites, offer the ability to study reduced magmatism in our solar system. This study presents comprehensive petrologic and isotopic studies of 14 aubrites, finding slow cooling histories and possible heterogeneity in their parent bodies. The partitioning behavior of elements in aubrites is similar to the behavior observed in magmatic systems on Mercury.
METEORITICS & PLANETARY SCIENCE
(2022)
Review
Astronomy & Astrophysics
Linda T. Elkins-Tanton, Erik Asphaug, James F. Bell Iii, Carver J. Bierson, Bruce G. Bills, William F. Bottke, Samuel W. Courville, Steven D. Dibb, Insoo Jun, David J. Lawrence, Simone Marchi, Timothy J. McCoy, Jose M. G. Merayo, Rona Oran, Joseph G. O'Rourke, Ryan S. Park, Patrick N. Peplowski, Thomas H. Prettyman, Carol A. Raymond, Benjamin P. Weiss, Mark A. Wieczorek, Maria T. Zuber
Summary: The asteroid (16) Psyche may be a metal-rich remnant of a differentiated planetesimal or a metal-rich asteroidal material. The NASA Psyche mission aims to determine its provenance. The project will use measurements of magnetic fields, metal to silicate mixing ratio, disruption between metal and rock, mineralogy, and nickel content to determine Psyche's origin and formation.
SPACE SCIENCE REVIEWS
(2022)
Correction
Astronomy & Astrophysics
Timothy J. McCoy, Steven D. Dibb, Patrick N. Peplowski, Clara Maurel, Hannah L. Bercovici, Catherine M. Corrigan, James F. Bell, Benjamin P. Weiss, David J. Lawrence, Daniel D. Wenkert, Thomas H. Prettyman, Lindy T. Elkins-Tanton
SPACE SCIENCE REVIEWS
(2022)
Article
Astronomy & Astrophysics
E. R. Jawin, T. J. McCoy, K. J. Walsh, H. C. Connolly, R-L Ballouz, A. J. Ryan, H. H. Kaplan, M. Pajola, V. E. Hamilton, O. S. Barnouin, J. P. Emery, B. Rozitis, D. N. DellaGiustina, M. G. Daly, C. A. Bennett, D. R. Golish, M. E. Perry, R. T. Daly, E. B. Bierhaus, M. C. Nolan, H. L. Enos, D. S. Lauretta
Summary: This article discusses the first global geologic map of the near-Earth asteroid (101955) Bennu created using data acquired by the OSIRIS-REx spacecraft. It explores the distinctive mapping challenges and best practices and defines two geologic units based on surface texture and other indicators.
Article
Geochemistry & Geophysics
David J. Lawrence, Patrick N. Peplowski, Jack T. Wilson, Richard C. Elphic
Summary: A global map of hydrogen abundances on the Moon has been generated using data from the Lunar Prospector Neutron Spectrometer. The results show that the hydrogen content on the lunar surface is consistent with hydrogen from solar wind deposition. An enhancement of hydrogen has been observed in the Moon's largest pyroclastic deposit, indicating the role of water in lunar magmatic events.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Geochemistry & Geophysics
C. M. Corrigan, K. Nagashima, C. Hilton, T. J. McCoy, R. D. Ash, H. A. Tornabene, R. J. Walker, W. F. McDonough, D. Rumble
Summary: The study reveals similarities between three ungrouped iron meteorites and group IVB iron meteorites, such as Ni enrichment and enrichments of certain refractory siderophile elements. However, there are also distinct genetic characteristics indicating different parent bodies for these meteorites.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
G. J. MacPherson, K. Nagashima, A. N. Krot, S. M. Kuehner, A. J. Irving, K. Ziegler, L. Mallozzi, C. Corrigan, D. Pitt
Summary: NWA 8418 is a unique chondrite that does not perfectly fit into any existing category. It shows similarities with CV, CK, and CL chondrites, but its abundance of large CAIs and low NiO content align it closest with the CV group. The absence of certain minerals in the alteration products of the CAIs, the magnesium-rich nature of the matrix olivines, and the presence of certain secondary minerals indicate a metamorphic temperature of over 600 degrees C. NWA 8418 is classified as a reduced CV4 chondrite, the first of its kind.
METEORITICS & PLANETARY SCIENCE
(2023)
Article
Geochemistry & Geophysics
Larry R. Nittler, Asmaa Boujibar, Ellen Crapster-Pregont, Elizabeth A. Frank, Timothy J. McCoy, Francis M. McCubbin, Richard D. Starr, Audrey Vorburger, Shoshana Z. Weider
Summary: Based on data from the MESSENGER mission, we determined the abundances of Fe, S, and Si on Mercury's surface, suggesting that the planet formed under highly reduced conditions. Furthermore, we found that the Cr/Si ratio on Mercury's surface is heterogeneous, ranging from 3.6×10(-5) in the Caloris Basin to 0.0012 in the high-magnesium region, with an average southern hemisphere value of 0.0008. By combining experimental data and planetary differentiation modeling, we concluded that if Mercury's Cr/Al ratio is similar to that of chondritic meteorites, Cr must be present in the planet's core and differentiation likely occurred at log fO(2) in the range of IW-6.5 to IW-2.5.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Letter
Multidisciplinary Sciences
Kevin C. Nolan, Andrew Weiland, Bradley T. Lepper, Jennifer Aultman, Laura R. Murphy, Bret J. Ruby, Kevin Schwarz, Matthew Davidson, DeeAnne Wymer, Timothy D. Everhart, Anthony M. Krus, Timothy J. McCoy
SCIENTIFIC REPORTS
(2023)
Article
Astronomy & Astrophysics
Carolyn M. Ernst, Nancy L. Chabot, Rachel L. Klima, Sanae Kubota, Gabe Rogers, Paul K. Byrne, Steven A. Hauck, Kathleen E. Vander Kaaden, Ronald J. Vervack, Sebastien Besse, David T. Blewett, Brett W. Denevi, Sander Goossens, Stephen J. Indyk, Noam R. Izenberg, Catherine L. Johnson, Lauren M. Jozwiak, Haje Korth, Ralph L. McNutt, Scott L. Murchie, Patrick N. Peplowski, Jim M. Raines, Elizabeth B. Rampe, Michelle S. Thompson, Shoshana Z. Weider
Summary: Mercury holds valuable clues to the distribution of elements at the birth of the solar system and how planets form and evolve in close proximity to their host stars. This Mercury Lander mission concept returns in situ measurements that address fundamental science questions raised by the MESSENGER mission's pioneering exploration of Mercury.
PLANETARY SCIENCE JOURNAL
(2022)
Article
Physics, Multidisciplinary
Karolina Kolos, Vladimir Sobes, Ramona Vogt, Catherine E. Romano, Michael S. Smith, Lee A. Bernstein, David A. Brown, Mary T. Burkey, Yaron Danon, Mohamed A. Elsawi, Bethany L. Goldblum, Lawrence H. Heilbronn, Susan L. Hogle, Jesson Hutchinson, Ben Loer, Elizabeth A. McCutchan, Matthew R. Mumpower, Ellen M. O'Brien, Catherine Percher, Patrick N. Peplowski, Jennifer J. Ressler, Nicolas Schunck, Nicholas W. Thompson, Andrew S. Voyles, William Wieselquist, Michael Zerkle
Summary: Accurate nuclear data is crucial for advances in various fields, and outdated or incomplete data can hinder progress and compromise safety. Collaboration across organizations and international borders is essential in addressing the shared needs for nuclear data.
PHYSICAL REVIEW RESEARCH
(2022)