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imaging atomic-scale chemistry from fused multi-modal electron microscopy

npj Computational materials 2022年第1期8卷 164-171页

作者： Jonathan Schwartz Zichao Wendy Di Yi Jiang Alyssa J.Fielitz Don-Hyung Ha Sanjaya D.Perera Ismail El Baggari Richard D.Robinson Jeffrey A.Fessler Colin Ophus Steve Rozeveld Robert Hovden Department of Materials Science and Engineering University of MichiganAnn ArborMIUSA Mathematics and Computer Science Division Argonne National LaboratoryLemontILUSA Advanced Photon Source Facility Argonne National LaboratoryLemontILUSA Dow Chemical Co. MidlandMIUSA Department of Material Science and Engineering Cornell UniversityIthacaNew YorkUSA School of Integrative Engineering Chung-Ang UniversitySeoulRepublic of Korea Department of Physics Cornell UniversityIthacaNYUSA The Rowland Institute at Harvard CambridgeMAUSA Department of Electrical Engineering and Computer Science University of MichiganAnn ArborMIUSA National Center for Electron Microscopy Lawrence Berkeley National LaboratoryMolecular FoundryBerkeleyCAUSA Applied Physics Program University of MIchiganAnn ArborMIUnited States

Efforts to map atomic-scale chemistry at low doses with minimal noise using electron microscopes are fundamentally limited by inelastic ***,fused multi-modal electron microscopy offers high signal-to-noise ratio(SNR)recovery of material chemistry at nano-and atomic-resolution by coupling correlated information encoded within both elastic scattering(high-angle annular dark-field(HAADF))and inelastic spectroscopic signals(electron energy loss(EELS)or energy-dispersive x-ray(EDX)).By linking these simultaneously acquired signals,or modalities,the chemical distribution within nanomaterials can be imaged at significantly lower doses with existing detector *** many cases,the dose requirements can be reduced by over one order of *** high SNR recovery of chemistry is tested against simulated and experimental atomic resolution data of heterogeneous nanomaterials.

关键词： materials chemistry fused

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engineering grain boundaries in monolayer molybdenum disulfide for efficient water-ion separation

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science (New York, N.Y.) 2025年第6735期387卷 776-782页

作者： Shen, Jie Aljarb, Areej Cai, Yichen Liu, Xing Min, Jiacheng Wang, Yingge Wang, Qingxiao Zhang, Chenhui Chen, Cailing Hakami, Mariam Fu, Jui-Han Zhang, Hui Li, Guanxing Wang, Xiaoqian Chen, Zhuo Li, Jiaqiang Dong, Xinglong Shih, Kaimin Huang, Kuo-Wei Tung, Vincent Shi, Guosheng Pinnau, Ingo Li, Lain-Jong Han, Yu Physical Sciences and Engineering Division (PSE) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore Department of Physics King Abdulaziz University Jeddah Saudi Arabia KAUST Catalysis Center King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing China Shanghai Applied Radiation Institute Shanghai Key Laboratory of Atomic Control and Application of Inorganic 2D Supermaterials Shanghai University Shanghai China Department of Mechanical Engineering University of Hong Kong Pok Fu Lam Road Hong Kong China Department of Civil Engineering University of Hong Kong Pok Fu Lam Road Hong Kong China Imaging and Characterization Core Lab King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Department of Chemical System Engineering School of Engineering University of Tokyo Tokyo Japan Center for Electron Microscopy South China University of Technology Guangzhou China School of Emergent Soft Matter South China University of Technology Guangzhou China Catalyst Center of Excellence (CCoE) Research and Development Center Saudi Aramco Dhahran Saudi Arabia Center for Sustainability and Energy Technologies Chang Gung University Taoyuan Taiwan Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining Qinghai China University of Chinese Academy of Sciences Wenzhou China

Two-dimensional (2D) materials have long been considered as ideal platforms for developing separation membranes. However, it is difficult to generate uniform subnanometer pores over large areas on 2D materials. We report that the well-defined eight-membered ring (8-MR) pores, typically formed at the boundaries of two antiparallel grains of monolayer molybdenum disulfide (MoS2), can serve as molecular sieves for efficient water-ion separation. The density of grain boundaries and, consequently, the number of 8-MR pores can be tuned by regulating the grain size. Optimized MoS2 membranes outperformed the state-of-the-art membranes in forward osmosis tests by demonstrating both ultrahigh water/sodium chloride selectivity and exceptional water permeance. Creating precise pore structures on atomically thin films through grain boundary engineering presents a promising route for producing membranes suitable for various applications.

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3D printed fiber-optic nanomechanical bioprobe

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International Journal of Extreme Manufacturing 2023年第1期5卷 222-234页

作者： Mengqiang Zou Changrui Liao Yanping Chen Lei Xu Shuo Tang Gaixia Xu Ke Ma Jiangtao Zhou Zhihao Cai Bozhe Li Cong Zhao Zhourui Xu Yuanyuan Shen Shen Liu Ying Wang Zongsong Gan Hao Wang Xuming Zhang Sandor Kasas Yiping Wang Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China School of Electronic and Communication Engineering Shenzhen PolytechnicShenzhen 518000People’s Republic of China Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging School of Biomedical EngineeringHealth Science CenterShenzhen UniversityShenzhen 518055People’s Republic of China Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Laboratory of Food and Soft Materials Department of Health Sciences and TechnologyETH Zurich8092 ZurichSwitzerland Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and Technology(HUST)Wuhan 430074People’s Republic of China Department of Applied Physics The HongKong Polytechnic UniversityHong KongPeople’s Republic of China Laboratory of Biological Electron Microscopy Ecole Polytechnique Fédérale de Lausanne1015 LausanneSwitzerland UnitéFacultaire d’Anatomie et de Morphologie(UFAM) CUMRLUniversity of Lausanne1005 LausanneSwitzerland

Ultrasensitive nanomechanical instruments,*** force microscopy(AFM),can be used to perform delicate biomechanical measurements and reveal the complex mechanical environment of biological ***,these instruments are limited because of their size and complex feedback *** this study,we demonstrate a miniature fiber optical nanomechanical probe(FONP)that can be used to detect the mechanical properties of single cells and in vivo tissue measurements.A FONP that can operate in air and in liquids was developed by programming a microcantilever probe on the end face of a single-mode fiber using femtosecond laser two-photon polymerization *** realize stiffness matching of the FONP and sample,a strategy of customizing the microcantilever’s spring constant according to the sample was proposed based on structure-correlated *** a proof-of concept,three FONPs with spring constants varying from 0.421 N m^(−1)to 52.6 N m^(−1)by more than two orders of magnitude were *** highest microforce sensitivity was 54.5 nmμN^(−1)and the detection limit was 2.1 *** Young’s modulus of heterogeneous soft materials,such as polydimethylsiloxane,muscle tissue of living mice,onion cells,and MCF-7 cells,were successfully measured,which validating the broad applicability of this *** strategy provides a universal protocol for directly programming fiber-optic ***,this method has no special requirements for the size and shape of living biological samples,which is infeasible when using commercial *** has made substantial progress in realizing basic biological discoveries,which may create new biomedical applications that cannot be realized by current AFMs.

关键词： two-photon polymerization nanolithography optical fiber sensor nanomechanical probe stiffness tunable microcantilever biosensor

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Understanding ADC variation by fat content effect using a dual-function MRI phantom

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European Radiology Experimental 2024年第1期8卷 19页

作者： Liu, Yi-Jui Tsai, Tung-Sheng Li, Ya-Hui Peng, Jo-Hua Chang, Hing-Chiu Peng, Hsu-Hsia Lee, Ying-Chieh Lee, Tung-Yang Liou, Chang-Hsien Lin, Tz-Feng Chew, Fatt-Yang Chou, Ruey-Hwang Juan, Chun-Jung Department of Automatic Control Engineering Feng Chia University Taichung Taiwan Ph.D. Program in Electrical and Communication Engineering Feng Chia University Taichung Taiwan Department of Medical Imaging China Medical University Hsinchu Hospital 199 Sec. 1 Xinglong Rd. Hsinchu County Zhubei City 302 Taiwan Department of Biomedical Engineering and Environmental Sciences National Tsing Hua University Hsinchu Taiwan Department of Biomedical Engineering Chinese University of Hong Kong Hong Kong Master’s Program of Biomedical Informatics and Biomedical Engineering Feng Chia University Taichung Taiwan Cheng Ching Hospital Taichung Taiwan Institute of Nuclear Engineering and Science National Tsing Hua University Hsinchu Taiwan Department of Fiber and Composite Materials Feng Chia University Taichung Taiwan Department of Medical Imaging China Medical University Hospital Taichung Taiwan Department of Radiology School of Medicine China Medical University Taichung Taiwan Graduate Institute of Biomedical Sciences China Medical University Taichung 406 Taiwan Center for Molecular Medicine China Medical University Hospital Taichung Taiwan Department of Medical Laboratory and Biotechnology Asia University Taichung Taiwan

Background: A dual-function phantom designed to quantify the apparent diffusion coefficient (ADC) in different fat contents (FCs) and glass bead densities (GBDs) to simulate the human tissues has not been documented yet. We propose a dual-function phantom to quantify the FC and to measure the ADC at different FCs and different GBDs. Methods: A fat-containing diffusion phantom comprised by 30 glass-bead-containing fat-water emulsions consisting of six different FCs (0, 10, 20, 30, 40, and 50%) multiplied by five different GBDs (0, 0.1, 0.25, 0.5, and 1.0 g/50 mL). The FC and ADC were measured by the “iterative decomposition of water and fat with echo asymmetry and least squares estimation-IQ,” IDEAL-IQ, and single-shot echo-planar diffusion-weighted imaging, SS-EP-DWI, sequences, respectively. Linear regression analysis was used to evaluate the relationship among the fat fraction (FF) measured by IDEAL-IQ, GBD, and ADC. Results: The ADC was significantly, negatively, and linearly associated with the FF (the linear slope ranged from -0.005 to -0.017, R² = 0.925 to 0.986, all p < 0.001). The slope of the linear relationship between the ADC and the FF, however, varied among different GBDs (the higher the GBD, the lower the slope). ADCs among emulsions across different GBDs and FFs were overlapped. Emulsions with low GBDs plus high FFs shared a same lower ADC range with those with median or high GBDs plus median or lower FFs. Conclusions: A novel dual-function phantom simulating the human tissues allowed to quantify the influence of FC and GBD on ADC. Relevance statement: The study developed an innovative dual-function MRI phantom to explore the impact of FC on ADC variation that can affect clinical results. The results revealed the superimposed effect on FF and GBD density on ADC measurements. Key points: • A dual-function phantom made of glass bead density (GBD) and fat fraction (FF) emulsion has been developed. • Apparent diffusion coefficient (ADC) values

关键词： Adipose tissue Diffusion magnetic resonance imaging Phantoms (imaging) Quality assurance (healthcare) Quality control

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Mechanical and radiation shielding properties of Philippine natural zeolite-mixed concrete

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Radiation Physics and Chemistry 2025年 236卷

作者： Rosero, Maria Cecilia SB. Grande, Marianna Lourdes Marie L. Inocencio, Eric M. Gili, Mon Bryan Z. Department of Physical Sciences and Mathematics – University of the Philippines Manila Ermita Manila1000 Philippines Department of Science and Technology – Philippine Nuclear Research Institute Commonwealth Avenue Diliman Quezon City1101 Philippines Medical Imaging Department Las Piñas General Hospital and Satellite Trauma Center Las Piñas City1742 Philippines Materials Science and Engineering Program College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines

This study investigated the mechanical and radiation shielding properties of Philippine natural zeolite (PNZ)-mixed concrete as a potential sustainable alternative to traditional cement in radiation shielding applications. Concrete mixtures with 0 %, 20 %, and 40 % PNZ replacement were tested for compressive strength, split tensile strength, and radiation shielding efficiency against X-ray and gamma radiation. The specific density of the control sample (pure concrete) is 1.75 g/cm3 while the concrete with 20 % and 40 % cement replacements were 1.62 and 1.61 g/cm3, respectively. Results showed that the 40 % PNZ mixture exhibited the highest mechanical strength, with a 400 % increase in the average compressive strength from the pure concrete mixture, attributed to the pozzolanic reaction between zeolite and calcium hydroxide. The 20 % PNZ mixture demonstrated the best radiation shielding performance, achieving the highest linear attenuation coefficients of 0.623, 0.433, 0.421, and 0.167 cm−1 at 65, 100, 118, and 662 keV, respectively. As a result, the concrete with 20 % cement replacement also exhibited the highest mass attenuation coefficients at these energies. The total atomic cross-section followed the trend 0 % > 20 % > 40 %, with the control sample having the lowest mean free path (MFP) and half-value layer (HVL) at lower energies. Experimental and simulation results confirmed that the 20 % PNZ mixture offers an optimal balance between mechanical strength and radiation shielding while promoting sustainability by reducing cement usage. © 2025 Elsevier Ltd

关键词： Reactor shielding

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Electronic excitations in monoclinic hafnia as studied by spatially and momentum-resolved electron energy-loss spectroscopy and ab initio density functional theory calculations

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Physical Review materials 2023年第6期7卷 065201-065201页

作者： Sz-Chian Liou Guo-Jiun Shu Vladimir P. Oleshko Hwanhui Yun Xiang-Lin Huang Hsin-An Chen Wei-Tin Chen Electron Microscopy Facility Institute for Functional Materials and Devices Lehigh University Bethlehem Pennsylvania 18015 USA and Advanced Imaging & Microscopy Laboratory Maryland NanoCenter Institute for Research in Electronic and Applied Physics University of Maryland College Park Maryland 20742 USA Department of Materials and Mineral Resources Engineering National Taipei University of Technology Taipei 10608 Taiwan Institute of Mineral Resources Engineering National Taipei University of Technology Taipei 10608 Taiwan Material Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Reliability Assessment Center for Chemical Materials Korea Research Institute of Chemical Technology Daejeon 34114 Korea Institute of Materials Science and Engineering National Taipei University of Technology Taipei 10608 Taiwan Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials National Taiwan University Taipei 10617 Taiwan and Taiwan Consortium of Emergent Crystalline Materials National Science and Technology Taipei 10622 Taiwan

Monoclinic hafnia (m−HfO2) with its high dielectric permittivity (κ) and larger band gap of ∼5.5−5.9eV deposited as a few nanometers thick m−HfO2 thin film on a Si substrate was introduced as an effective gate oxide in complementary metal-oxide-semiconductor devices by Intel in 2007. However, the existence and complex anisotropic excitation characters of this centrosymmetric monoclinic crystal structure—which involve both single-particle and collective electron excitations such as plasmons, and include electron-hole (excitonic) and electron-electron (self-energy) interactions—remain elusive. Therefore, the electronic nature of the material needs to be explored in depth for applications in semiconductor technology. In this study, spatially and momentum-resolved electron energy-loss spectroscopy (EELS) in conjunction with first-principles calculations of the electronic band structure and dielectric function have been employed to investigate electronic excitations in m−HfO2. The phase purity and crystallinity of m−HfO2 were confirmed by x-ray diffraction and EELS. Low-loss EELS performed using aloof electron beam setups and energy-filtered transmission electron microscopy spectrum imaging (EFTEM-SI) revealed spectral features at 13.5 and 16 eV energy loss assigned to surface plasmons and volume plasmons (VPs), respectively. Surface exciton polaritons (SEPs) with surface resonances associated with excitonic onsets above the band gap were also observed at ∼7.5 and ∼28eV energy loss. The surface excitation character of these features was confirmed by EFTEM-SI and relativistic calculations of energy versus momentum (E−k) maps. Using collection-angle (β) and momentum (q)-resolved EELS, it was found that the SEP intensity at ∼7.5eV energy loss is a function of β and q, and no anisotropic shape for the VP is observed along the [100], [010], and [001] directions. Furthermore, the peak at ∼48eV energy loss was assigned to a semicore Hf5p plasmon involving multiplet resonant pro

关键词： Electronic structure

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Antitumor efficacy and potential mechanism of FAP-targeted radioligand therapy combined with immune checkpoint blockade

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Signal Transduction and Targeted Therapy 2024年第7期9卷 2936-2952页

作者： Liang Zhao Yizhen Pang Yangfan Zhou Jianhao Chen Hao Fu Wei Guo Weizhi Xu Xin Xue Guoqiang Su Long Sun Hua Wu Jingjing Zhang Zhanxiang Wang Qin Lin Xiaoyuan Chen Haojun Chen Department of Nuclear Medicine and Minnan PET Center Xiamen Key Laboratory of RadiopharmaceuticalsThe First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamenChina Departments of Diagnostic Radiology SurgeryChemical and Biomolecular Engineeringand Biomedical EngineeringYong Loo Lin School of Medicine and College of Design and EngineeringNational University of SingaporeSingaporeSingapore Clinical Imaging Research Centre Centre for Translational MedicineYong Loo Lin School of MedicineNational University of SingaporeSingaporeSingapore Department of Radiation Oncology Xiamen Cancer CenterXiamen Key Laboratory of Radiation OncologyThe First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamenChina Department of Colorectal Tumor Surgery Xiamen Cancer CenterXiamen Key Laboratory of Radiation OncologyThe First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamenChina Department of Cardiothoracic Surgery Zhongda HospitalSchool of MedicineSoutheast UniversityNanjingChina Nanomedicine Translational Research Program NUS Center for NanomedicineYong Loo Lin School of MedicineNational University of SingaporeSingaporeSingapore Department of Neurosurgery and Department of Neuroscience Fujian Key Laboratory of Brain Tumors Diagnosis and Precision TreatmentXiamen Key Laboratory of Brain Centerthe First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamenChina Institute of Molecular and Cell Biology Agency for ScienceTechnology and Research(A*STAR)SingaporeSingapore Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamenChina

Radiotherapy combined with immune checkpoint blockade holds great promise for synergistic antitumor *** radionuclide therapy delivers radiation directly to tumor ***1004 is a fibroblast activation protein(FAP)-targeting radiopharmaceutical,conjugated with the albumin binder Evans Blue,which has demonstrated enhanced tumor uptake and retention in previous preclinical and clinical ***,we demonstrate that^(68)Ga/^(177)Lu-labeled LNC1004 exhibits increased uptake and prolonged retention in MC38/NIH3T3-FAP and CT26/NIH3T3-FAP tumor *** therapy with^(177)Lu-LNC1004 induced a transient upregulation of PD-L1 expression in tumor *** combination of^(177)Lu-LNC1004 and anti-PD-L1 immunotherapy led to complete eradication of all tumors in MC38/NIH3T3-FAP tumor-bearing mice,with mice showing 100%tumor rejection upon ***,single-cell RNA sequencing(scRNA-seq),and TCR sequencing revealed that combination therapy reprogrammed the tumor microenvironment in mice to foster antitumor immunity by suppressing malignant progression and increasing cell-to-cell communication,CD8^(+)T-cell activation and expansion,M1 macrophage counts,antitumor activity of neutrophils,and T-cell receptor diversity.A preliminary clinical study demonstrated that^(177)Lu-LNC1004 was well-tolerated and effective in patients with refractory ***,scRNA-seq of peripheral blood mononuclear cells underscored the importance of addressing immune evasion through immune checkpoint blockade *** was emphasized by the observed increase in antigen processing and presentation juxtaposed with T cell *** conclusion,our data supported the efficacy of immunotherapy combined with^(177)Lu-LNC1004 for cancer patients with FAP-positive tumors.

关键词： immunity retention holds

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Exploring the 3D Resolution of Parallax Phase Reconstruction from 4D STEM: A Dopant Depth Case Study

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microscopy and Microanalysis 2022年第S1期28卷 404-405页

作者： Terzoudis-Lumsden, EWC Petersen, TC Brown, HG Pelz, PM Ophus, C Findlay, SD School of Physics and Astronomy Monash University Melbourne VIC Australia Monash Centre for Electron Microscopy Monash University Melbourne VIC Australia Ian Holmes Imaging Center Bio21 Molecular Science and Biotechnology Institute University of Melbourne Melbourne VIC Australia National Center for Electron Microscopy Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA USA Department of Materials Science and Engineering University of California Berkeley CA USA

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Insights into the Antibacterial Properties of Cancer Theranostic Zinc-Dopped Iron Oxide ZnxFe3-xO4 Nanoparticles

SSRN

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SSRN 2024年

作者： Asaftei, Mihaela Lucidi, Massimiliano Anton, Stefan R. Tranca, Denis E. Hristu, Radu Wu, Aiguo Yang, Yiqian Stanciu, George A. Lazar, Veronica Ionita, Mariana Cincotti, Gabriella Visca, Paolo Holban, Alina Yang, Fang Stanciu, Stefan G. Center for Microscopy-Microanalysis and Information Processing National Technical University Politehnica of Bucharest 313 Splaiul Independentei Bucharest060042 Romania Department of Microbiology and Immunology Faculty of Biology University of Bucharest Bucharest060101 Romania Department of Science Roma Tre University Viale G. Marconi 446 Rome Italy NBFC National Biodiversity Future Center piazza Marina 61 Palermo90133 Italy Laboratory of Advanced Theranostic Materials and Technology Ningbo Key Laboratory of Biomedical Imaging Probe Materials and Technology Zhejiang International Cooperation Base of Biomedical Materials Technology and Application Ningbo Cixi Institute of Biomedical Engineering Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China Advanced Polymer Materials Group National University of Science and Technology Politehnica Bucharest Gheorghe Polizu 1-7 Bucharest011061 Romania Department of Engineering Roma Tre University Viale G. Marconi 446 Rome Italy

The global mortality rate from antimicrobial-resistant infections is steadily rising, driven primarily by the widespread use of antibiotics in the last decades, a problem exarcerbated during the COVID-19 pandemic. The exponential growth of antimicrobial resistance far outpaces the current development of new antibiotics. One promising strategy to counteract the rise of antibiotic-resistant bacteria is the use of nanomaterials as antimicrobial agents. In recent past works Zinc-Doped Iron Oxide ZnxFe3–xO4 nanoparticles (NPs) have been demonstrated as a highly efficient cancer theranostics agent capable of several different, complementary, therapeutic routes, depending on the Zn doping concentration. In this study, we demonstrate for the fist time interesting antibacterial effects of this nanomaterial, investigating the interactions of ZnxFe3–xO4 NPs with various Zn concentrations (0.2%, 1%, 1.5%, 2%) with two opportunistic pathogens: the Gram-positive bacterium Staphylococcus aureus and the Gram-negative bacterium Pseudomonas aeruginosa, both of which are among the top resistant nosocomial pathogens, and model organisms. We adopt a holistic approach, looking at: (i) the antimicrobial effects of ZnxFe3–xO4 NPs, either alone, or in combination with two antibiotics, gentamicin (CN) and ciprofloxacin (CIP), (ii) their efficacy at dispersing bacterial planktonic aggregates, and (iii) their biofilm-impeding properties. Last, we employ Atomic Force microscopy for qualitative and quantitative analyses of bacterial cells treated with CIP, CN and ZnxFe3–xO4 NPs to enable knowledge on mechanisms of antibacterial action of the latter. © 2024, The Authors. All rights reserved.

关键词： Staphylococcus aureus

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High-pressure phase of cold-compressed bulk graphite and graphene nanoplatelets

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Physical Review B 2023年第18期107卷 184102-184102页

作者： Ilias Efthimiopoulos Elissaios Stavrou Koichiro Umemoto Sathish Mayanna Antonius Torode Jesse S. Smith Stella Chariton Vitali B. Prakapenka Alexander F. Goncharov Yuejian Wang Department of Physics Oakland University Rochester Michigan 48309 USA GFZ German Research Center for Geosciences Telegrafenberg 14473 Potsdam Germany Materials Science and Engineering Program Guangdong Technion–Israel Institute of Technology Shantou Guangdong 515063 China Department of Materials Science and Engineering Technion–Israel Institute of Technology Haifa 32000 Israel Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion Guangdong Technion–Israel Institute of Technology Shantou Guangdong 515063 China Earth-Life Science Institute Tokyo Institute of Technology Meguro Tokyo 150–8550 Japan Carl Zeiss Microscopy GmbH Carl Zeiss Strasse 22 73447 Oberkochen Germany HPCAT X-ray Science Division Argonne National Laboratory Argonne Illinois 60439 USA Center for Advanced Radiation Sources University of Chicago Chicago Illinois 60637 USA Earth and Planets Laboratory Carnegie Institution of Washington Washington DC 20015 USA

We have studied the high-pressure vibrational and structural behavior of bulk graphite and graphene nanoplatelets at room temperature by means of high-pressure Raman spectroscopic and x-ray diffraction probes. We have detected a clear pressure-induced structural transition in both materials, evidenced by the appearance of new Bragg peaks and Raman features, deviating from the starting hexagonal graphitic structure. The high-pressure phase is identified as a partially disordered orthorhombic structure, consisting of mixed sp2- and sp3-type bonding. Our experimental findings serve as direct evidence for the existence of a metastable transient modification in cold compressed carbon, lying between the sp2-type graphite and sp3-type diamond allotropes.

关键词： Phase transitions Structural properties Carbon-based materials Crystal structures Elemental materials Pressure effects Pressure techniques Raman spectroscopy X-ray diffraction

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