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Structure factor of a phase separating binary mixture with natural and forceful interconversion of species

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arXiv 2021年

作者： Longo, Thomas Joseph Shumovskyi, Nikolay A. Asadov, Salim M. Buldryev, Sergey V. Anisimov, Mikhail A. Institute for Physical Science and Technology University of Maryland College ParkMD20742 United States Department of Physics Boston University BostonMA02215 United States Institute of Catalysis and Inorganic Chemistry Azerbaijan National Academy of Sciences BakuAZ1143 Azerbaijan Department of Physics Yeshiva University New YorkNY10033 United States Department of Chemical and Biomolecular Engineering University of Maryland College ParkMD20742 United States

Using a modified Cahn-Hilliard-Cook theory for spinodal decomposition in a binary mixture that exhibits both diffusion and interconversion dynamics, we derive the time-dependent structure factor for concentration fluctuations. We compare the theory and obtain a qualitative agreement with simulations of the temporal evolution of the order parameter and structure factor in a nonequilibrium Ising/lattice-gas hybrid model in the presence of an external source of forceful interconversion. In particular, the characteristic size of the steady-state phase domain is predicted from the lower cut-off wavenumber of the amplification factor in the generalized spinodal-decomposition theory. © 2021, CC BY-NC-SA.

关键词： Phase separation

ATClean: A Novel Method for Detecting Low-Luminosity Transients and Application to Pre-explosion Counterparts from SN 2023ixf

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arXiv 2024年

作者： Rest, S. Rest, A. Kilpatrick, C.D. Jencson, J.E. von Coelln, S. Strolger, L. Smartt, S. Anderson, J.P. Clocchiatti, A. Coulter, D.A. Denneau, L. Gomez, S. Heinze, A. Ridden-Harper, R. Smith, K.W. Stalder, B. Tonry, J.L. Wang, Q. Zenati, Y. Department of Computer Science The Johns Hopkins University BaltimoreMD21218 United States Department of Physics and Astronomy The Johns Hopkins University BaltimoreMD21218 United States Space Telescope Science Institute BaltimoreMD21218 United States Department of Physics and Astronomy Northwestern University EvanstonIL60208 United States IPAC California Institute of Technology 1200 East California Boulevard PasadenaCA91125 United States Department of Physics Case Western Reserve University 2076 Adelbert Rd. ClevelandOH44106 United States Astrophysics Sub-department Department of Physics University of Oxford Keble Road OxfordOX1 3RH United Kingdom Astrophysics Research Centre School of Mathematics and Physics Queen’s University Belfast BelfastBT7 1NN United Kingdom European Southern Observatory Alonso de Córdova 3107 Casilla 19 Santiago Chile Millennium Institute of Astrophysics MAS Nuncio Monseñor Sótero Sanz 100 Of. 104 Providencia Santiago Chile Instituto de Astrofísica Pontificia Universidad Católica de Chile Vicuña Mackenna 4860 Macul Santiago Chile Institute for Astronomy University of Hawaii 2680 Woodlawn Drive HonoluluHI96822 United States DiRAC Institute The Department of Astronomy University of Washington 3910 15th Avenue NE SeattleWA98195 United States School of Physical and Chemical Sciences—Te Kura Matū University of Canterbury Private Bag 4800 Christchurch8140 New Zealand Vera C. Rubin Observatory Project Office 950 N Cherry Ave TucsonAZ95719 United States

In an effort to search for faint sources of emission over arbitrary timescales, we present a novel method for analyzing forced photometry light curves in difference imaging from optical surveys. Our method "ATLAS Clean" or ATClean, utilizes the reported fluxes, uncertainties, and fits to the point-spread function from difference images to quantify the statistical significance of individual measurements. We apply this method to control light curves across the image to determine whether any source of flux is present in the data for a range of specific timescales. From ATLAS o-band imaging at the site of the Type II supernova (SN) 2023ixf in M101 from 2015–2023, we show that this method accurately reproduces the 3σ flux limits produced from other, more computationally expensive methods. We derive limits for emission on timescales of 5 days and 80-300 days at the site of SN 2023ixf, which are 19.8 and 21.3 mag, respectively. The latter limits rule out variability for unextinguished red supergiants (RSG) with initial masses >22 M, comparable to the most luminous predictions for the SN 2023ixf progenitor system. We also compare our limits to short timescale outbursts, similar to those expected for Type IIn SN progenitor stars or the Type II SN 2020tlf, and rule out outburst ejecta masses of >0.021 M, much lower than the inferred mass of circumstellar matter around SN 2023ixf in the literature. In the future, these methods can be applied to any forced point-spread function photometry on difference imaging from other surveys, such as Rubin optical imaging. © 2024, CC BY.

关键词： Photometry

Selective electrosorption of Cs(I) from high-salinity radioactive wastewater using CNT-interspersed potassium zinc ferrocyanide electrodes

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Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica 2025年第9期41卷

作者： Xiang, Shuhong Yang, Lv Xu, Yingsheng Cao, Guoxin Zhou, Hongjian Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Anhui Province Hefei 230031 China College of Polymer Science and Engineering Sichuan University Sichuan Province Chengdu 610065 China Midea Corporate Research Center Midea Group Guangdong Province Foshan 528311 China Hubei Key Laboratory of Pollutant Analysis & Reuse Technology College of Chemistry and Chemical Engineering Hubei Normal University Hubei Province Huangshi 435002 China

The management of 137Cs-containing radioactive wastewater from the Fukushima nuclear accident (FNA) has garnered significant attention due to the challenge of its safe disposal. The presence of co-existing Na+ ions se... 详细信息

The management of ¹³⁷Cs-containing radioactive wastewater from the Fukushima nuclear accident (FNA) has garnered significant attention due to the challenge of its safe disposal. The presence of co-existing Na⁺ ions severely impedes Cs⁺ removal, exacerbating the costs associated with radioactive wastewater treatment. Recently, capacitive deionization (CDI) technology has demonstrated significant potential in this field. However, its application is limited by the lack of suitable electrode materials that exhibit high Cs⁺ selectivity. In this study, we developed a composite of carbon nanotubes (CNT) interspersed potassium zinc ferrocyanide (KZnFC-CNT), which was pre-activated via an electrochemical method, to serve as a CDI cathode for the selective electrosorption of Cs⁺ ions from saline radioactive wastewater. The KZnFC-CNT electrodes exhibited a maximum electrosorption capacity of 392.75 mg g⁻¹, with the highest electrosorption rate of 11.21 mg g⁻¹ min⁻¹. Furthermore, these electrodes exhibited remarkable selectivity, achieving a selectivity factor of 138.2 for Cs⁺ over Na⁺ in a Na⁺: Cs⁺ molar ratio of 100 : 1. X-ray diffraction, electrochemical analysis, and theoretical simulations revealed that the selective electrosorption of Cs⁺ is primarily governed by the ion exchange process between Cs⁺ and Na⁺ ions, as well as lattice phase transformations in KZnFC. This study presents an effective approach for the treatment of cesium-containing radioactive wastewater with high salinity. © 2025 College of Chemistry and Molecular Engineering, Peking University

关键词： Capacitive deionization Phase transformation Radioactive wastewater Selective cesium electrosorption Zinc ferrocyanide

Observation of the near-threshold intruder 0− resonance in 12Be

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arXiv 2021年

作者： Chen, Jie Wang, S.M. Fortune, H.T. Lou, J.L. Ye, Y.L. Li, Z.H. Michel, N. Li, J.G. Yuan, C.X. Ge, Y.C. Li, Q.T. Hua, H. Jiang, D.X. Yang, X.F. Pang, D.Y. Xu, F.R. Zuo, W. Pei, J.C. Li, J. Jiang, W. Sun, Y.L. Zang, H.L. Aoi, N. Ong, H.J. Ideguchi, E. Ayyad, Y. Hatanaka, K. Tran, D.T. Bazin, D. Lee, J. Zhang, Y.N. Wu, J. Liu, H.N. Wen, C. Yamamoto, T. Tanaka, M. Suzuki, T. School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing100871 China FRIB/NSCL Laboratory Michigan State University East LansingMI48824 United States Department of Physics and Astronomy University of Pennsylvania PhiladelphiaPA19104 United States Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University ZhuhaiGuangdong519082 China Research Center for Nuclear Physics Osaka University Osaka567-0047 Japan RIKEN Institute of Physical and Chemical Research 2-1 Hirosawa Wako Saitama351-0198 Japan Department of Physics Western Michigan University KalamazooMI49008 United States

A resonant state at (formula presented) MeV, located just above the one-neutron separation threshold, was observed for the first time in 12Be from the 11Be (d, p)12Be one-neutron transfer reaction in inverse kinematics. This state is assigned a spin-parity of 0−, according to the distorted-wave Born approximation (DWBA) and decay-width analysis. Gamow coupled-channel (GCC) and Gamow shell-model (GSM) calculations show the importance of the continuum-coupling, which dramatically influences the excitation energy and ordering of low-lying states. Various exotic structures associated with cross-shell intruding configurations in 12Be and in its isotonic nucleus 11Li are comparably discussed. © 2021, CC BY-NC-SA.

关键词： Inverse kinematics

Measurement of the branching fractions of the B+→ηℓ+νℓ and B+→η′ℓ+νℓ decays with signal-side only reconstruction in the full q2 range

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physical Review D 2022年第3期106卷 032013-032013页

作者： U. Gebauer C. Beleño A. Frey I. Adachi K. Adamczyk H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera K. Belous J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov M.-C. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das N. Dash G. De Nardo F. Di Capua J. Dingfelder Z. Doležal T. V. Dong S. Eidelman D. Epifanov T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob K. Gudkova C. Hadjivasiliou S. Halder T. Hara O. Hartbrich K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou C.-L. Hsu T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin C. W. Joo K. K. Joo J. Kahn A. B. Kaliyar K. H. Kang G. Karyan T. Kawasaki H. Kichimi C. Kiesling C. H. Kim D. Y. Kim S. H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee S. C. Lee P. Lewis Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty M. Mrvar R. Mussa M. Nakao Z. Natkaniec A. Natochii L. Nayak M. Nayak N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik E. Prencipe M. T. Prim M. V. Purohit M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma J.-G. Shiu B. Shwartz F. Simon E. Solovieva S. Stanič M. Starič Z. S. Stottler T. Sumiyoshi M. Takizawa U. Tamponi F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo R. Van Tonder G. II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of Cincinnati Cincinnati Ohio 45221 Higher School of Economics (HSE) Moscow 101000 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Indian Institute of Technology Madras Chennai 600036 Institute for High Energy Physics Protvino 142281 University of Mississippi University Mississippi 38677 University of Hawaii Honolulu Hawaii 96822 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Wayne State University Detroit Michigan 48202 Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor INFN—Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80126 Napoli University of Bonn 53115 Bonn Department of Physics Fu Jen Catholic University Taipei 24205 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 34141 Yonsei University Seoul 03722 Gyeongsang National University Jinju 52828 Sungkyunkw

The branching fractions of the decays B+→ηℓ+νℓ and B+→η′ℓ+νℓ are measured, where ℓ is either an electron or a muon, using a data sample of 711 fb−1 containing 772×106BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. To reduce the dependence of the result on the form factor model, the measurement is performed over the entire q2 range. The resulting branching fractions are B(B+→ηℓ+νℓ)=(2.83±0.55(stat.)±0.34(syst.))×10−5 and B(B+→η′ℓ+νℓ)=(2.79±1.29(stat.)±0.30(syst.))×10−5.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Bottom quark Lepton colliders

Search for B0 meson decays into Λ and missing energy with a hadronic tagging method at Belle

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physical Review D 2022年第5期105卷 L051101-L051101页

作者： C. Hadjivasiliou B. G. Fulsom J. F. Strube I. Adachi H. Aihara D. M. Asner H. Atmacan T. Aushev V. Babu K. Belous J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal D. Bodrov J. Borah A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola D. Červenkov M.-C. Chang P. Chang A. Chen B. G. Cheon K. Chilikin H. E. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das G. De Pietro F. Di Capua Z. Doležal T. V. Dong D. Dossett D. Epifanov T. Ferber R. Garg V. Gaur A. Giri P. Goldenzweig T. Gu K. Gudkova H. Hayashii W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin J. Kahn A. B. Kaliyar K. H. Kang G. Karyan C. Kiesling C. H. Kim D. Y. Kim K. T. Kim Y.-K. Kim P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny R. Kumar K. Kumara Y.-J. Kwon S. C. Lee L. K. Li S. X. Li Y. B. Li L. Li Gioi J. Libby K. Lieret C. MacQueen M. Masuda D. Matvienko M. Merola K. Miyabayashi R. Mizuk G. B. Mohanty R. Mussa M. Nakao Z. Natkaniec A. Natochii M. Nayak N. K. Nisar S. Nishida K. Nishimura H. Ono P. Oskin P. Pakhlov G. Pakhlova T. Pang S.-H. Park S. Paul T. K. Pedlar L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo M. Shapkin C. P. Shen J.-G. Shiu B. Shwartz F. Simon J. B. Singh E. Solovieva M. Starič Z. S. Stottler M. Sumihama T. Sumiyoshi M. Takizawa K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno R. Van Tonder G. Varner A. Vinokurova E. Waheed C. H. Wang E. Wang M.-Z. Wang P. Wang X. L. Wang S. Watanuki L. Wood B. D. Yabsley W. Yan H. Ye J. Yelton J. H. Yin Z. P. Zhang V. Zhilich V. Zhukova Pacific Northwest National Laboratory Richland Washington 99352 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Brookhaven National Laboratory Upton New York 11973 University of Cincinnati Cincinnati Ohio 45221 National Research University Higher School of Economics Moscow 101000 Deutsches Elektronen–Synchrotron 22607 Hamburg Institute for High Energy Physics Protvino 142281 University of Mississippi University Mississippi 38677 University of Hawaii Honolulu Hawaii 96822 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana P. N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor INFN—Sezione di Roma Tre I-00146 Roma INFN—Sezione di Napoli I-80126 Napoli Università di Napoli Federico II I-80126 Napoli Department of Physics Fu Jen Catholic University Taipei 24205 Department of Physics National Taiwan University Taipei 10617 National Central University Chung-li 32054 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 Gyeongsang National University Jinju 52828 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 Malaviya National Institute of Technology Jaipur Jaipur 302017 Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 School of Physics University of Melbourne Victoria 3010 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 6300

We present a search for the decays of B0 mesons into a final state containing a Λ baryon and missing energy. These results are obtained from a 711 fb−1 data sample that contains 772×106 BB¯ pairs and was collected near the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We use events in which one B meson is fully reconstructed in a hadronic decay mode and require the remainder of the event to consist of only a single Λ. No evidence for these decays is found, and we set 90% confidence level upper limits on the branching fractions in the range 2.1–3.8×10−5. This measurement provides the world’s most restrictive limits, with implications for baryogenesis and dark matter production.

关键词： Baryogenesis & leptogenesis Hypothetical particle physics models Particle dark matter

Describing the Migdal effect with a bremsstrahlung-like process and many-body effects

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arXiv 2020年

作者： Liang, Zheng-Liang Mo, Chongjie Zheng, Fawei Zhang, Ping College of Mathematics and Physics Beijing University of Chemical Technology Beijing100029 China Beijing Computational Science Research Center Beijing100193 China School of Physics Beijing Institute of Technology Beijing100081 China School of Physics and Physical Engineering Qufu Normal University Qufu273165 China Institute of Applied Physics and Computational Mathematics Beijing100088 China

Recent theoretical studies have suggested that the suddenly recoiled atom struck by dark matter (DM) particle is much more likely to excite or lose its electrons than expected. Such Migdal effect opens a new avenue for exploring the sub-GeV DM particles. There have been various attempts to describe the Migdal effect in liquid and semiconductor targets. In this paper we incorporate the treatment of the bremsstrahlung process and the electronic many-body effects to give a full description of the Migdal effect in bulk semiconductor targets diamond and silicon. Compared with the results obtained with the atom-centered localized Wannier functions (WFs) under the framework of the tight-binding (TB) approximation, the method proposed in this study yields much larger event rates in the low energy regime, due to a ω-4scaling. We also find that the effect of the bremsstrahlung photon mediating the Coulomb interaction between recoiled ion and the electronhole pair is equivalent to that of the exchange of a single phonon. Copyright © 2020, The Authors. All rights reserved.

关键词： Ion exchange

Anti-Perovskite Type Ni3InC0.5 Anchored on Defective Nano Diamond-Graphene for Highly Efficient Acetylene Semi-Hydrogenation

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Advanced Functional Materials 2025年

作者： Ma, Chang-Song Fan, Wenxuan Kong, Yuan Xu, Cong Dong, Chenyang Xu, Shi-Long Zuo, Ming Zuo, Lu-Jie Nie, Xinming Tie, Wen-An Tian, Xiao-Yan Wang, Bo Yan, Yan Liang, Hai-Wei Liu, Mingkai School of Materials and Chemical Engineering Anhui Jianzhu University Hefei230601 China Hefei National Research Center for Physical Sciences at the Microscale Department of Chemistry University of Science and Technology of China Hefei230026 China School of Chemistry & Chemical Engineering Anhui University of Technology Anhui Ma'anshan243002 China Leicester International Institute Dalian University of Technology Panjin124221 China School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou221116 China Co. Ltd. Xian710065 China

Designing low-cost, nontoxic, and earth-abundant transition metal catalysts for the selective hydrogenation of alkynes is important but high selectivity and hydrogenation activity simultaneously remains challenging. Herein, an anti-perovskite crystal structure Ni3InC0.5 catalyst supported on a defective nanodiamond graphene (ND@G) is reported, which exhibits excellent catalytic performance for the selective conversion of C2H2 to C2H4, i.e., with high conversion (95%), high selectivity (85%), and good stability (over 250 h). Density functional theory calculations and performance analysis reveal that synergistic effect between ND@G support and Ni3InC0.5 nanoparticles enable highly efficient C2H2 semi-hydrogenation. ND@G support makes Ni more electron-rich through strong metal-support interactions, as a result of reducing the energy barrier of rate determining step and improving hydrogenation activity. Meanwhile, the crystal geometric structure of Ni3InC0.5 can effectively promote desorption of C2H4 and suppressed the reaction pathway of C2H4 over-hydrogenation, thus improved the semi-hydrogenation selectivity. This work provides insights into the design of anti-perovskite type catalysts with engineered metal-support interactions, offering potential applications in industrial catalysis. © 2025 Wiley-VCH GmbH.

关键词： Crystal lattices

Ultrathin Magnesium-based Coating as an Efficient Oxygen Barrier for Superconducting Circuit Materials

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arXiv 2023年

作者： Zhou, Chenyu Mun, Junsik Yao, Juntao Anbalagan, Aswin kumar Hossain, Mohammad D. McLellan, Russell A. Li, Ruoshui Kisslinger, Kim Li, Gengnan Tong, Xiao Head, Ashley R. Weiland, Conan Hulbert, Steven L. Walter, Andrew L. Li, Qiang Zhu, Yimei Sushko, Peter V. Liu, Mingzhao Center for Functional Nanomaterials Brookhaven National Laboratory UptonNY11973 United States The Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory UptonNY11973 United States Department of Materials Science and Chemical Engineering Stony Brook University Stony BrookNY11794 United States National Synchrotron Light Source II Brookhaven National Laboratory UptonNY11973 United States Physical and Computational Sciences Directorate Pacific Northwest National Laboratory RichlandWA99354 United States Department of Electrical and Computer Engineering Princeton University PrincetonNJ08540 United States Department of Chemistry Stony Brook University Stony BrookNY11794 United States Materials Measurement Laboratory National Institute of Standard and Technology GaithersburgMD20899 United States Department of Physics and Astronomy Stony Brook University Stony BrookNY11794 United States

Scaling up superconducting quantum circuits based on transmon qubits necessitates substantial enhancements in qubit coherence time. Among the materials considered for transmon qubits, tantalum (Ta) has emerged as a promising candidate, surpassing conventional counterparts in terms of coherence time. However, the presence of an amorphous surface Ta oxide layer introduces dielectric loss, ultimately placing a limit on the coherence time. In this study, we present a novel approach for suppressing the formation of tantalum oxide using an ultrathin magnesium (Mg) capping layer deposited on top of tantalum. Synchrotron-based X-ray photoelectron spectroscopy (XPS) studies demonstrate that oxide is confined to an extremely thin region directly beneath the Mg/Ta interface. Additionally, we demonstrate that the superconducting properties of thin Ta films are improved following the Mg capping, exhibiting sharper and higher-temperature transitions to superconductive and magnetically ordered states. Based on the experimental data and computational modeling, we establish an atomic-scale mechanistic understanding of the role of the capping layer in protecting Ta from oxidation. This work provides valuable insights into the formation mechanism and functionality of surface tantalum oxide, as well as a new materials design principle with the potential to reduce dielectric loss in superconducting quantum materials. Ultimately, our findings pave the way for the realization of large-scale, high-performance quantum computing systems. © 2023, CC BY.

关键词： X ray photoelectron spectroscopy