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arXiv 2020年

作者： Liu, Baolei Chen, Chaohao Di, Xiangjun Liao, Jiayan Wen, Shihui Su, Qian Peter Shan, Xuchen Xu, Zai-Quan Ju, Lining Arnold Wang, Fan Jin, Dayong Faculty of Science University of Technology Sydney SydneyNSW2007 Australia School of Mathematical and Physical Sciences Faculty of Science University of Technology Sydney UltimoNSW2007 Australia School of Biomedical Engineering Faculty of Engineering Charles Perkins Centre University of Sydney CamperdownNSW2006 Australia Heart Research Institute NewtownNSW2042 Australia UTS-SUStech Joint Research Centre for Biomedical Materials & Devices Department of Biomedical Engineering Southern University of Science and Technology Shenzhen China

Video-rate super-resolution imaging through biological tissue can visualize and track biomolecule interplays and transportations inside cellular organisms. Structured illumination microscopy allows for wide-field super resolution observation of biological samples but is limited by the strong absorption and scattering of light by biological tissues, which degrades its imaging resolution. Here we report a photon upconversion scheme using lanthanide-doped nanoparticles for wide-field super-resolution imaging through the biological transparent window, featured by near-infrared and low-irradiance nonlinear structured illumination. We demonstrate that the 976 nm excitation and 800 nm up-converted emission can mitigate the aberration. We found that the nonlinear response of upconversion emissions from single nanoparticles can effectively generate the required high spatial frequency components in Fourier domain. These strategies lead to a new modality in microscopy with a resolution of 130 nm, 1/7thof the excitation wavelength, and a frame rate of 1 fps. Copyright © 2020, The Authors. All rights reserved.

关键词： Infrared devices

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Bypassing the limit in volumetric imaging of mesoscale specimens

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Advanced Photonics 2019年第2期1卷 3-4页

作者： Chaohao Chen Zhen Liu Dayong Jin University of Technology Sydney Institute for Biomedical Materials and DevicesFaculty of ScienceUltimoNew South WalesAustralia Southern University of Science and Technology Department of Biomedical EngineeringShenzhenChina

The development of light-sheet microscopy(LSM)1,2 has revolutionized high-resolution imaging of biological organisms in three dimensions(3D)with minimal photodamage3 and high temporal resolution,4 therefore allowing long-term observation of biological processes.5,6 The key is to obtain information on subcellular events at both high spatial and temporal resolutions,but the spatial resolution of current LSM methods has been pixel-limited when each frame of the image is collected under a large field of view from an entire large-volume specimen.

关键词： processes. limit dimensions

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Magnetic skyrmion bundles and their current-driven dynamics

arXiv

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arXiv 2021年

作者： Tang, Jin Wu, Yaodong Wang, Weiwei Kong, Lingyao Lv, Boyao Wei, Wensen Zang, Jiadong Tian, Mingliang Du, Haifeng Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences University of Science and Technology of China Hefei230031 China School of Physics and Materials Engineering Hefei Normal University Hefei230601 China Institutes of Physical Science and Information Technology Anhui University Hefei230601 China School of Physics and Materials Science Anhui University Hefei230601 China Department of Physics and Astronomy University of New Hampshire DurhamNH03824 United States Materials Science Program University of New Hampshire DurhamNH03824 United States

Quantization of topological charges determines the various topological spin textures that are expected to play a key role in future spintronic devices. While the magnetic skyrmion with a unit topological charge Q = ±1 has been extensively studied, spin textures with other integer-valued Q have not been verified well so far. Here, we report the real-space image, creation, and manipulation of a type of multi-Q three-dimensional skyrmionic texture, where a circular spin spiral ties a bunch of skyrmion tubes. We define these objects as skyrmion bundles, and show they have arbitrarily integer values Q from negative up to at least 55 in our experiment. These textures behave as quasiparticles in dynamics for the collective motions driven by electric pulses. Similar to the skyrmion, skyrmion bundles with Q ≠ 0 exhibit the skyrmion Hall effects with a Hall angle of ~ 62°. Of particular interest, the skyrmion bundle with Q = 0 propagates collinearly with respect to the current flow without the skyrmion Hall effect. Our results open a new perspective for possible applications of multi-Q magnetic objects in future spintronic devices. © 2021, CC BY.

关键词： Textures

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Single-Molecule Vibrational Characterization of Binding Geometry Effects on Isocyanide-Metal Interactions

arXiv

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arXiv 2025年

作者： Bi, Liya Wang, Zhe Balto, Krista Tao, Andrea R. Pascal, Tod A. Zhang, Yanning Figueroa, Joshua S. Li, Shaowei Department of Chemistry and Biochemistry University of California La Jolla San DiegoCA92093-0309 United States Program in Materials Science and Engineering University of California La Jolla San DiegoCA92093-0418 United States Department of Physics and Astronomy University of California IrvineCA92697-4575 United States Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu611731 China Aiiso Yufeng Li Family Department of Chemical and Nano Engineering University of California La Jolla San DiegoCA92093-0448 United States

Isocyanide-metal binding is governed by σ-donation and π-back-bonding, which affects the energy of the isocyanide stretching mode—a characteristic probe for ligand-metal interactions. While extensive correlations exist between structure and spectroscopy in molecular isocyanide-metal systems, isocyanide interactions with metallic crystalline surfaces, where ligands often bind in various geometries, remain poorly understood. Conventional vibrational spectroscopies, such as infrared and Raman, lack the molecular-scale resolution needed to distinguish these inhomogeneous configurations. In contrast, inelastic electron tunneling spectroscopy with scanning tunneling microscopy (STM-IETS) enables direct visualization of ligand adsorption geometries and their vibrational signatures. Using STM-IETS, here we investigate an metal-adsorbed m-terphenyl isocyanide ligand and find that adsorption geometry on Cu(100) induces a significant shift in isocyanide stretching frequency, even greater than replacing Cu(100) with Ag(111). Density functional theory confirms this shift arises from atomic-scale variations in isocyanide-metal binding. This study elucidates how atomic-scale binding influences the vibrational signatures of isocyanide ligands—an often-overlooked factor in understanding isocyanide-metal interactions. © 2025, CC BY.

关键词： Vibrational spectroscopy

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In-situ electron microscopy study of non-volatile resistive switching in Mott insulator VO2

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Microscopy and Microanalysis 2021年第S1期27卷 2162-2164页

作者： Shaobo Cheng Min-Han Lee Xing Li Lorenzo Fratino Marcelo Rozenberg Ivan Schuller Yimei Zhu Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory Upton NY USA upton New York United States University of California-San Diego United States Key Laboratory of Material Physics School of Physics and Microelectronics Zhengzhou University Zhengzhou Henan P. R. China United States Laboratoire de Physique des Solides CNRS Université Paris-Sud Université Paris-Saclay Orsay France United States Materials Science and Engineering Program University of California-San Diego La Jolla CA USA United States Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory Upton NY USA United States

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Biocompatible polyelectrolyte microcapsules generated with magnetic water-in-water droplet microfluidics 23

Biocompatible polyelectrolyte microcapsules generated with m...

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23rd International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2019

作者： Navi, Maryam Kieda, Jennifer Abbasi, Niki Tsai, Scott S.H. Graduate Program in Biomedical Engineering Ryerson University Toronto Canada Department of Mechanical and Industrial Engineering Ryerson University Toronto Canada Kennan Research Center for Biomedical Science St. Michael's Hospital Toronto Canada -a partnership between Ryerson University St. Michael's Hospital Canada

ISBN: (纸本)9781733419000

We report an all-aqueous and biocompatible platform for the generation of polyelectrolyte microcapsules using magnetic water-in-water droplet microfluidics. We use a polymeric aqueous two-phase system to generate the droplets. To functionalize the droplets with paramagnetic properties, we add ferrofluid to the droplet phase, which also contains the positively charged polyelectrolyte. Utilizing a magnetic field, the magnetic droplets are then moved to a second phase which contains the negatively charged polyelectrolyte, where the polyelectrolytes meet at the interface of the droplet and form a shell. Such polyelectrolyte microcapsules have applications in drug delivery and cell mimicry. © 2019 CBMS-0001.

关键词： Drops

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Tailored Zr bio-MOF structures for CO 2 adsorption: A comparative study of binderless pelletization and chitosan-based extrusion

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International Journal of Biological Macromolecules 2025年 318卷

作者： Mahmoud I. Zaghloul Marwa F. Elkady Mohamed E. El-Khouly Gehad G. Mohamed Nanoscience Program Institute of Basic and Applied Sciences Egypt-Japan University of Science and Technology New Borg El Arab 21934 Alexandria Egypt Fabrication Technologies Researches Department Advanced Technology and New Materials Research Institute City of Scientific Research and Technological Applications (SRTA- City) Alexandria Egypt Chemical and Petrochemicals Engineering Department Egypt-Japan University of Science and Technology New Borg El Arab 21934 Alexandria Egypt Chemistry Department Faculty of Science Cairo University Giza 12613 Egypt

An ultra-microporous, bio-based zirconium metal-organic framework (MIP-202), was successfully synthesized and formulated into compressed pellets and extrudates through incorporation with the biopolymer chitosan, targeting efficient CO 2 adsorption. The effects of formulation pressure and the addition of chitosan as a co-binder were systematically investigated to optimize the physical integrity and performance of the shaped adsorbents. Comprehensive physicochemical characterizations were conducted using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and Brunauer–Emmett–Teller (BET) surface area analysis. The formulated pellets and extrudates demonstrated excellent thermal stability, good mechanical durability, and retention of their ultra-microporous structure (<1 nm) after formulation. Remarkably, they preserved up to 99 % of the CO 2 adsorption capacity of the pristine powder form (18.7 cm 3 g −1 at 298 K and 1 bar), with a low isosteric heat of adsorption (30–40 kJ mol −1 ), which also facilitates easy CO 2 desorption and enhances regeneration efficiency. Furthermore, they exhibited a high CO 2 /N 2 (15/85, v /v), towards CO 2 with a selectivity ratio of 24–25 under dry and humid conditions. The materials maintained moderate moisture stability over 20 days, strong resistance in N 2 O environments, and excellent cyclic stability over 10 temperature swing adsorption (TSA) cycles. Combined with the low cost of the MOF bio-ligand, L-aspartic acid (∼$36/kg), these findings highlight the potential of MIP-202 pellets and extrudates as robust and economically viable candidates for industrial flue gas separation applications.

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Pure organic electrophosphorochromism system

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Chinese Chemical Letters 2025年

作者： Ya-Ting Gao Yi-Lin Zhu Xiao-Yuan Wang Li-Ya Liang Meng-Li Liu Shuai Chang Han-Bin Xu Da-Wei Li Bin-Bin Chen Key Laboratory for Advanced Materials Shanghai Key Laboratory of Functional Materials Chemistry Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology & Dynamic Chemistry School of Chemistry & Molecular Engineering East China University of Science and Technology Shanghai 200237 China Institute of Biomedical Photonics and Sensing School of Life Science and Technology Xi'an Jiaotong University Xi'an 710049 China Department of The Second Affiliated Hospital School of Medicine The Chinese University of Hong Kong Shenzhen (CUHK-Shenzhen) Shenzhen 518172 China

Electrochromic phosphorescent materials have recently attracted much attention, however, achieving the efficient electrophosphorochromism in pure organic materials is highly challenging and has not been reported yet. Herein, a kind of pure organic host-guest system (BA@CzPA) is constructed by one-pot in-situ melt blending of (9-phenyl-9H-carbazol-2-yl)boronic acid (CzPA) and boric acid (BA). Because of the efficient intersystem crossing promoted by covalent, hydrogen bonding, and confinement effect, the proposed BA@CzPA exhibit the superior room temperature phosphorescence (RTP) efficiency, including an ultralong lifetime of up to 4.23 s and a high phosphorescent quantum yield of 10.9%. Importantly, the BA@CzPA have a unique electrophosphorochromism property, and their electrically-induced RTP emission can gradually red-shift from 440 nm to 548 nm as the current density increases, which is attributed to the transformation of host matrices of BA@CzPA from metaboric acid to B 2 O 3 under the electrical stimuli. This finding provides us not only with a new idea to develop pure organic electrophosphorochromism materials with high RTP efficiency, but also with a powerful strategy to fabricate correlation color temperature tunable white light emitting diodes.

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Strain-programmable van der Waals magnetic tunnel junctions

Newton

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Newton 2025年

作者： John Cenker Dmitry Ovchinnikov Harvey Yang Daniel G. Chica Catherine Zhu Jiaqi Cai Geoffrey Diederich Zhaoyu Liu Xiaoyang Zhu Xavier Roy Ting Cao Matthew W. Daniels Jiun-Haw Chu Di Xiao Xiaodong Xu Department of Physics University of Washington Seattle WA 98195 USA Department of Chemistry Columbia University New York NY 10027 USA Intelligence Community Postdoctoral Research Fellowship Program University of Washington Seattle WA USA Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA Physical Measurement Laboratory National Institute of Standards and Technology Gaithersburg MD 20899 USA

Magnetic tunnel junctions (MTJs) are foundational spintronics devices with applications ranging from stable magnetic memory to emerging stochastic computing schemes. Integrating van der Waals magnets into these devices could enable the realization of atomically thin MTJs with unique functionalities. Here, we demonstrate that the strain-tunable magnetism of the layered semiconductor CrSBr offers a new type of programmable MTJ operation. Switching the CrSBr tunnel barrier from antiferromagnetic (AFM) to ferromagnetic (FM) order by strain generates a giant tunneling magnetoresistance ratio without an external magnetic field. In addition to the purely FM and AFM states, we observe a variety of intermediate magnetic states consisting of both FM- and AFM-coupled layers. The layer-dependent magnetization of these states can be actively switched via the application of strain pulses. Alternatively, finely adjusting the static strain to minimize the energy difference between AFM and FM interlayer coupling results in stochastic switching with a strain-tunable sigmoidal response curve. Our results demonstrate new approaches for manipulating layered two-dimensional (2D) magnetism toward spintronic devices.

关键词： two-dimensional magnets van der Waals magnetic tunnel junctions spintronics strain tuning stochastic switching

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Geometrical frustration and piezoelectric response in oxide ferroics

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Physical Review materials 2020年第1期4卷 014405-014405页

作者： Valeri Petkov Jong-Woo Kim Sarvjit Shastri Shashaank Gupta Shashank Priya Department of Physics and Science of Advanced Materials Program Central Michigan University Mt. Pleasant Michigan 48859 USA X-ray Science Division Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA Virginia Tech India Center for Advanced Research and Education Chennai Tamil Nadu 600095 India Department of Materials Science and Engineering Penn State University Park Pennsylvania 16802 USA

materials with increased functionality are often based on crystalline structures with significant local disorder. Typical examples are ferroic oxides exhibiting large spontaneous polarization that can be rotated by an applied electric field, finding use in many important applications. Despite years of investigation, the exact structural origin of the increased piezoelectric response of oxide ferroics is still unclear. Frequently evoked models attribute it to emerging polar nanoregions inside a nonpolar matrix, the existence of a morphotropic boundary separating polar phases with different crystallographic symmetry, low-symmetry bridging phases facilitating polarization rotation, and displacive and order-disorder structural phase transitions. Here we use both conventional and resonant high-energy x-ray diffraction coupled to atomic pair distribution function analysis and three-dimensional computer simulations to examine the relationship between the local structure and piezoelectric properties of exemplary sodium-potassium niobate ferroics. We show that their increased piezoelectric response is primarily due to a geometrical frustration in the underlying perovskite lattice induced by local fluctuations in the tilt pattern of the constituent niobium-oxygen octahedra, and not to a crystal-crystal phase transition or distinct nanodomains. The fluctuations peak when the sodium to potassium ratio approaches 1, leading to a softening of the perovskite lattice and easing of polarization rotation under an electric field. Based on the experimental data and model calculations involving Goldschmidt's tolerance factor for the stability of perovskites, we also show that the fluctuations are driven by the mismatch between the radii of sodium and potassium atoms, and the increased piezoelectric response of sodium-potassium niobates indeed scales with the variance in the distribution of these radii about the average value. Thus, we settle important aspects of the debate over the stru

关键词： Ferroelectricity Crystal structures Monte Carlo methods Resonant elastic x-ray scattering

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