检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Liu, Yang Fang, Shuai Shao, Li Wang, Jianwei Li, Ming Stoikov, Ivan I. Wang, Mengbin Hua, Bin Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou310058 China Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou311215 China Department of Materials Science and Engineering Zhejiang Sci-Tech University Hangzhou310018 China A.M. Butlerov Chemical Institute Kazan Federal University Kremlevskaya 18 Kazan420008 Russia

Separation of o-ethyltoluene (OET) and m-ethyltoluene (MET) poses a significant challenge in industrial applications due to their closely matched boiling points and similar chemical structures. In this study, we successfully achieve selective adsorpive separation of OET over MET by tuning the host–guest interactions of pillar[6]arenes with ethyltoluene isomers. Experimental results demonstrate that perbromoethylated pillar[6]arene (BrP6) can effectively separate OET and MET, yielding an impressive OET purity of 94.0%. Unlike conventional alkyl chain-modified pillar[6]arenes such as perethylated pillar[6]arene (EtP6) and n-perpropylated pillar[6]arene (PrP6), the improved selectivity of BrP6 arises from the electron-withdrawing effect induced by the bromine atoms present on the side chain. The presence of bromine atoms enhances the electropositivity of the side chain in BrP6, amplifies the contrast in electron cloud density between the branched chains and the cavity of BrP6, and further facilitates the favorable binding of OET with BrP6 due to the concentrated electron density in OET's branched chain. © 2023, The Authors. All rights reserved.

关键词： Supramolecular chemistry

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Cell- And Serum-Derived Proteins Act as DAMPs to Activate RAW 264.7 Macrophages in the Foreign Body Response to Silicone Implants

SSRN

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SSRN 2023年

作者： Blackman, Samuel A. Miles, Dalton Suresh, Joshita Calve, Sarah Bryant, Stephanie J. Department of Chemical and Biological Engineering University of Colorado Boulder 3415 Colorado Ave BoulderCO80309-0596 United States Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder 1111 Engineering Dr BoulderCO80309-0427 United States BioFrontiers Institute University of Colorado Boulder 3415 Colorado Ave BoulderCO80309-0596 United States Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Dr BoulderCO80300-0613 United States

Protein adsorption after biomaterial implantation is the first stage of the foreign body response (FBR). However, the source(s) of the adsorbed proteins that lead to damaged associated molecular patterns (DAMPs) and induce inflammation has not been fully elucidated. This study examined the effects of different protein sources: cell-derived (from a NIH/3T3 fibroblast cell lysate) and serum-derived (from fetal bovine serum), which were compared to implant-derived proteins (after a 30-min subcutaneous implantation in mice) on activation of RAW 264.7 macrophages cultured in minimal (serum-free) medium. Both cell-derived and serum-derived protein sources when pre-adsorbed to either tissue culture polystyrene or medical grade silicone induced macrophage activation. The combination led to an even higher expression of pro-inflammatory cytokines genes and proteins. Implant-derived proteins on silicone explants induced a rapid inflammatory response that then subsided more quickly and to a greater extent than the studies with in vitro cell-derived or serum-derived protein sources. Proteomic analysis of the implant-derived proteins identified proteins that included cell-derived and serum-derived, but also other protein sources (e.g., extracellular matrix), suggesting the latter may help to temper the inflammatory response in vivo. These findings indicate that both serum-derived and cell-derived proteins can act as DAMPs to drive inflammation in the FBR, but that other protein sources may play an important role in controlling inflammation. © 2023, The Authors. All rights reserved.

关键词： Proteins

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Phase Segregation Dynamics in Mixed-Halide Perovskites Revealed by Plunge-Freeze Cryogenic Electron Microscopy

arXiv

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arXiv 2024年

作者： Fan, Qingyuan Li, Yanbin Vigil, Julian A. Jiang, Zhiqiao Nandi, Partha Colby, Robert Zhang, Chensong Cui, Yi Karunadasa, Hemamala I. Lindenberg, Aaron M. Department of Materials Science and Engineering Stanford University StanfordCA94305 United States SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Stanford PULSE Institute SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Chemistry Stanford University StanfordCA94305 United States Department of Chemical Engineering Stanford University StanfordCA94305 United States Corporate Strategic Research ExxonMobil Research and Engineering 1545 US Highway 22 East AnnandaleNJ08807 United States ExxonMobil Technology and Engineering Company AnnandaleNJ08801 United States Department of Molecular and Cellular Physiology StanfordCA94305 United States

Mixed-halide lead perovskites, with photoexcited charge-carrier properties suitable for high-efficiency photovoltaics, hold significant promise for high-efficiency tandem solar cells. However, phase segregation under illumination, where an iodide-rich phase forms carrier trap states, remains a barrier to applications. This study employs plunge-freeze cryogenic electron microscopy to visualize nanoscale phase segregation dynamics in CsPb(BrxI1–x)3 films. By rapidly freezing the illuminated samples, we preserve transient photoexcited ion distributions for high-resolution structural and compositional analysis at the nanoscale. Cryogenic scanning transmission electron microscopy techniques (EELS, 4D-STEM) captured the dynamics of photo-induced iodine migration from grain boundaries to centers, identified the buildup of anisotropic strain, and captured the heterogeneous evolution of this process within a single grain. These findings provide new insights into microscopic phase segregation mechanisms and their dynamics, enhancing our understanding of mixed-halide perovskite photostability. © 2024, CC BY-NC-ND.

关键词： Grain boundaries

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Soft-lock drawing of super-aligned carbon nanotube bundles for nanometre electrical contacts (vol 17, pg 278, 2022)

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NATURE NANOTECHNOLOGY 2022年第3期17卷 331-331页

作者： Guo, Yunfan Shi, Enzheng Zhu, Jiadi Shen, Pin-Chun Wang, Jiangtao Lin, Yuxuan Mao, Yunwei Deng, Shibin Li, Baini Park, Ji-Hoon Lu, Ang-Yu Zhang, Shuchen Ji, Qingqing Li, Zhe Qiu, Chenguang Qiu, Song Li, Qingwen Dou, Letian Wu, Yue Zhang, Jin Palacios, Tomas Cao, Anyuan Kong, Jing Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Research Institute of Frontier Technology College of Micro-Nano Electronics Zhejiang University Hangzhou China Taiwan Semiconductor Manufacturing Company (TSMC) Hsinchu Taiwan Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou China School of Materials Science and Engineering Peking University Beijing China Davidson School of Chemical Engineering Purdue University West Lafayette IN USA Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA USA Department of Chemistry Purdue University West Lafayette IN USA College of Chemistry and Molecular Engineering Peking University Beijing China Department of Chemical and Biological Engineering Iowa State University Ames IA USA Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics Peking University Beijing China Division of Advanced Nano-Materials Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou China

The assembly of single-walled carbon nanotubes (CNTs) into high-density horizontal arrays is strongly desired for practical applications, but challenges remain despite myriads of research efforts. Herein, we developed a non-destructive soft-lock drawing method to achieve ultraclean single-walled CNT arrays with a very high degree of alignment (angle standard deviation of ~0.03°). These arrays contained a large portion of nanometre-sized CNT bundles, yielding a high packing density (~400 µm−1) and high current carrying capacity (∼1.8 × 108A cm−2). This alignment strategy can be generally extended to diverse substrates or sources of raw single-walled CNTs. Significantly, the assembled CNT bundles were used as nanometre electrical contacts of high-density monolayer molybdenum disulfide (MoS2) transistors, exhibiting high current density (~38 µA µm−1), low contact resistance (~1.6 kΩ µm), excellent device-to-device uniformity and highly reduced device areas (0.06 µm2per device), demonstrating their potential for future electronic devices and advanced integration technologies.

关键词： Locks (fasteners)

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Cold atmospheric plasma-enabled platelet vesicle incorporated iron oxide nano-propellers for thrombolysis

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materials Today Bio 2023年 23卷 100876页

作者： Jheng, Pei-Ru Chiang, Chia-Che Kang, Jiunn-Horng Fan, Yu-Jui Wu, Kevin C.-W. Chen, Yan-Ting Liang, Jia-Wei Bolouki, Nima Lee, Jyh-Wei Hsieh, Jang-Hsing Chuang, Er-Yuan Graduate Institute of Nanomedicine and Medical Engineering Graduate Institute of Biomedical Materials and Tissue Engineering Institute of Biomedical Optomechatronics International Ph.D. Program in Biomedical Engineering School of Biomedical Engineering College of Biomedical Engineering Professional Master Program in Artificial Intelligence in Medicine College of Medicine Taipei Medical University Taipei11031 Taiwan Department of Physical Medicine and Rehabilitation Taipei Medical University Hospital Taipei Taiwan Institute of Biomedical Engineering & Nanomedicine National Health Research Institute Keyan Road Zhunan Miaoli City350 Taiwan Department of Chemical Engineering National Taiwan University No.1 Sec. 4 Roosevelt Rd Taipei10617 Taiwan Department of Plasma Physics and Technology Faculty of Science Masaryk University Brno Czech Republic Center for Plasma and Thin Film Technologies Ming Chi University of Technology New Taipei City Taiwan Department of Materials Engineering Ming Chi University of Technology New Taipei City Taiwan Cell Physiology and Molecular Image Research Center Taipei Medical University-Wan Fang Hospital Taipei11696 Taiwan

A new approach to treating vascular blockages has been developed to overcome the limitations of current thrombolytic therapies. This approach involves biosafety and multimodal plasma-derived theranostic platelet vesicle incorporating iron oxide constructed nano-propellers platformed technology that possesses fluorescent and magnetic features and manifold thrombus targeting modes. The platform is capable of being guided and visualized remotely to specifically target thrombi, and it can be activated using near-infrared phototherapy along with an actuated magnet for magnetotherapy. In a murine model of thrombus lesion, this proposed multimodal approach showed an approximately 80 % reduction in thrombus residues. Moreover, the new strategy not only improves thrombolysis but also boosts the rate of lysis, making it a promising candidate for time-sensitive thrombolytic therapy. © 2023 The Authors

关键词： Infrared devices

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Geometric topology–driven purely resistive electrodes in hexagonally close-packed urchin-like hollow carbon sphere monolayers for flexible electronics

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Composites Part B: engineering 2025年 305卷

作者： Tianyu Zhu Sai Zhang Min Chen Lan Shi Limin Wu Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 China School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang 212003 Jiangsu China

Periodic array–structured carbon materials have attracted considerable attention owing to their broad applications in heterogeneous catalysis, energy storage, photonics and sensors. However, they are typically assembled into multi-layer stacks that introduce complex internal interfaces, leading to carrier scattering and charge accumulation, thereby reducing electrical performance. Furthermore, structural changes under external force limit the applicability of multi-layer materials in flexible electronics. Herein, to effectively address these issues, a carbon microsphere film with geometric-topological design is introduced. A monolayer colloidal microsphere template is first prepared by the self-assembly technique, and the subsequent in situ growth yields an urchin-like hollow carbon sphere array film. It exhibits a stable 0° phase angle over a wide frequency range (1 Hz–0.1 MHz) and demonstrates excellent linearity and symmetry in current–voltage behaviour, with no hysteresis of the electrical signal. It exhibits pure resistance behaviour and precision with variations of <0.025 %. When made into a flexible pressure sensor, the sensor achieves a sensitivity of ≤408 kPa −1 and an ultrafast response time of 0.8 ms. In addition, it can enable individuals with limited experience to perform precise manual operations such as vein injection.

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Assessing the Critical Current Density of All-Solid-State Li Metal Symmetric and Full Cells

SSRN

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SSRN 2022年

作者： Ham, So-Yeon Yang, Hedi Nunez-Cuacuas, Omar Tan, Darren H.S. Chen, Yu-Ting Deysher, Grayson Cronk, Ashley Ridley, Phillip Doux, Jean-Marie Wu, Erik A. Jang, Jihyun Meng, Ying Shirley Materials Science and Engineering Program University of California San Diego La Jolla 92093 United States Department of NanoEngineering University of California San Diego La Jolla CA92093 United States Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States

All-solid-state Li metal batteries (Li-ASSBs) have drawn much attention in recent years owing to their potential in achieving high energy densities. However, the low critical current density (CCD) of Li-ASSBs at room temperature remains a major bottleneck which limits the prospects for commercialization. Most studies reported so far have demonstrated CCDs significantly lower than conventional lithium-ion batteries, along with a lack of consistency across such reports. While these CCD inconsistencies can be attributed to variations in pressure, temperature, and solid electrolyte chemistry, crucial parameters often omitted in the literature, such as the fabrication pressure used and duration for which it is applied, both of which are required to achieve good contact between Li metal and the solid electrolyte. Here, the relationship between the fabrication pressure contact hold time of Li metal versus CCD is reported, thus elucidating the effect of controlled Li deformation on the CCD. The CCDs for symmetric and full cell architectures are also evaluated, where the effect of volumetric expansion and associated changes in cell stack pressure are examined. Finally, a constant pressure cell design is introduced to mitigate the negative effects of volume change during cycling, allowing the Li-ASSB to achieve higher CCDs at room temperature. © 2022, The Authors. All rights reserved.

关键词： Solid electrolytes

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Magnetic Properties of Al3+ Ion Solid-Solid Doped Fe3o4 and Biological Applications of Gqds Grafted Mnps

SSRN

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SSRN 2023年

作者： Huan, Wei-Wei Dong, Meng-Yang Guan, Yuxia Xie, Meng Huang, Yan Carlini, Riccardo Yang, Yu-Xiang Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass College of Chemistry and Materials Engineering Zhejiang A & F University Zhejiang Hangzhou311300 China School of Chemistry and Molecular Engineering East China University of Science & Technology Shanghai200237 China School of Pharmacy Jiangsu University Jiangsu Province 212013 China Chemistry and Material Chemistry Department LAS Klee-Barabino Genova16146 Italy

Strong magnetic nanoparticles doped by nonmagnetic ions of Al3+ were prepared by solid-solid grinding of as-prepared Fe3O4 magnetic nanoparticles with aluminum formic acid hydrazide. HRTEM, XRD, Mössbaure spectrum and VSM were used to characterize the morphology, structure, magnetic properties of doped magnetic particles, and their doping mechanism. 2.79% Al doped magnetic nanoparticles (MNPs) showing the largest saturation magnetization value (82.3 emu/g) were chosen to be further coated with silica shell. Then GQDs grafted 2.79% Al doped MNPs@SiO2 were employed to label 99mTc for targeting in vivo: mice were in vivo used as animal model to study biological application of 99mTc labeled GQDs-Al doped NMPs: A higher magnetic response effect under pulsed magnetic gradient field of targeted functionalized Al doped magnetic particles was observed. The obtained data from both control group and experimental group indicated that the uptake ability of radioactivity in the liver of New Zealand rabbits via the magnetic targeted intervention is 3.69 times higher than that achieved in the liver of the New Zealand rabbits without magnetic targeted intervention. © 2023, The Authors. All rights reserved.

关键词： Aluminum compounds

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Transformation between elastic dipoles, quadrupoles, octupoles and hexadecapoles driven by surfactant self-assembly in nematic emulsion

arXiv

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arXiv 2022年

作者： Senyuk, Bohdan Mozaffari, Ali Crust, Kevin Zhang, Rui de Pablo, Juan J. Smalyukh, Ivan I. Department of Physics and Soft Materials Research Center University of Colorado Boulder CO United States Pritzker School of Molecular Engineering The University of Chicago ChicagoIL United States Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Center for Molecular Engineering Argonne National Laboratory LemontIL United States Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program University of Colorado Boulder CO United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado Boulder CO United States

Emulsions comprising isotropic fluid drops within a nematic host are of interest for applications ranging from biodetection to smart windows, which rely on changes of molecular alignment structures around the drops in response to chemical, thermal, electric and other stimuli. We show that absorption or desorption of trace amounts of common surfactants can drive continuous transformations of elastic multipoles induced by the droplets within the uniformly aligned nematic host. Out-of-equilibrium dynamics of director structures emerge from a controlled self-assembly or desorption of different surfactants at the drop-nematic interfaces, with ensuing forward and reverse transformations between elastic dipoles, quadrupoles, octupoles and hexadecapoles. We characterize inter-transformations of droplet-induced surface and bulk defects, probe elastic pair interactions and discuss emergent prospects for fundamental science and applications of the reconfigurable nematic emulsions. © 2022, CC BY-NC-ND.

关键词： Surface active agents

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molecular-Scale Visualization of Steric Effects of Ligand Binding to Reconstructed Au(111) Surfaces

arXiv

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arXiv 2023年

作者： Bi, Liya Jamnuch, Sasawat Chen, Amanda Do, Alexandria Balto, Krista P. Wang, Zhe Zhu, Qingyi Wang, Yufei Zhang, Yanning Tao, Andrea R. Pascal, Tod A. 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 Nano and Chemical Engineering University of California La Jolla San DiegoCA92093-0448 United States Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu611731 China

Direct imaging of single molecules at nanostructured interfaces is a grand challenge, with potential to enable new, precise material architectures and technologies. Of particular interest are the structural morphology and spectroscopic signatures of the adsorbed molecule, where modern probes are only now being developed with the necessary spatial and energetic resolution to provide detailed information at molecule-surface interface. Here, we directly visualize the binding of individual m-terphenyl isocyanide ligands to a reconstructed Au(111) surface through scanning tunneling microscopy (STM) and inelastic electron tunneling spectroscopy (IETS). The site-dependent steric pressure of the various surface features alters the vibrational fingerprints of the m-terphenyl isocyanides, which is characterized with single-molecule precision through joint experimental and theoretical approaches. This study for the first time provides molecular-level insights into the steric-pressure-enabled surface binding selectivity, as well as its effect on the chemical properties of individual surface-binding ligands. © 2023, CC BY.

关键词： Scanning tunneling microscopy

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