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Electrospun Aligned PCL/Gelatin Scaffolds Mimicking the Skin ECM for Effective Antimicrobial Wound Dressings

Advanced Fiber materials 2023年第1期5卷 235-251页

作者： Erfan Rezvani Ghomi Rajamani Lakshminarayanan Vijila Chellappan Navin Kumar Verma Amutha Chinnappan Rasoul Esmaeely Neisiany Kottaiswamy Amuthavalli Zhi Sheng Poh Brandon Han Siang Wong Nileshkumar Dubey Roger Narayan Seeram Ramakrishna Department of Mechanical Engineering Center for Nanotechnology and SustainabilityNational University of SingaporeSingapore 117581Singapore Ocular Infections and Antimicrobials Research Group Singapore Eye Research InstituteThe Academia20 College RoadDiscovery TowerSingapore 169856Singapore Institute of Materials Research and Engineering(IMRE) Agency for Science Technology and Research(A*STAR)#08‑032 Fusionopolis WayInnovisSingapore 138634Singapore Lee Kong Chian School of Medicine Nanyang Technological University SingaporeClinical Sciences Building11 Mandalay RoadSingapore 308232Singapore Department of Pharmacy National University of Singapore18 Science Drive 4Singapore 117543Singapore Academic Clinical Program in Ophthalmology and Visual Sciences Academic Clinical Program Duke-NUS Medical SchoolSingapore 169857Singapore National Skin Centre 1 Mandalay RoadSingapore 308205Singapore Department of Materials and Polymer Engineering Faculty of EngineeringHakim Sabzevari UniversitySabzevar ***Iran Faculty of Dentistry National University of SingaporeSingapore 119085Singapore ORCHIDS:Oral Care Health Innovations and Designs Singapore National University of SingaporeSingaporeSingapore 119085Singapore Department of Biomedical Engineering University of North Carolina at Chapel HillChapel HillNC 27514USA

Bacterial infections and multidrug-resistant bacteria are major health burdens in wound *** antimicrobial agents,e.g.,ε-polylysine(ε-PL),provide a broad spectrum of antibacterial properties and support dermal cell ***,ε-PL was incorporated into polycaprolactone(PCL)/gelatin electrospun scaffolds collected at varying rotation ***,the samples were crosslinked using dopamine hydrochloride to provide highly proliferative dressings with broad antimicrobial *** morphological study showed that the electrospun wound dressings were smooth,continuous,and bead-free,with a mean diameter ranging from 267±7 to 331±8 nm for all random and aligned *** fiber alignment of the electrospun PCL/gelatin scaffolds improved their tensile strength and ***,nanofiber mats are highly hydro-philic,which is crucial for an efficient wound *** samples also demonstrated high antimicrobial properties against common wound bacterial strains,including methicillin-resistant Staphylococcus aureus(MRSA),Staphylococcus aureus(SA),Escherichia coli(EC),Acinetobacter baumannii(AB),and Pseudomonas aeruginosa(PA).Mammalian cell prolifera-tion and morphology assays involving primary human dermal fibroblasts(hDFs)and immortalized keratinocytes(HaCaT)showed excellent biocompatibility of the electrospun mats and remarkably aligned ***,aligned mats showed more cell migration than randomly oriented mats,which is desirable for more efficient wound ***,it can be concluded that aligned PCL/gelatin mats containingε-PL are promising for potential use in wound dressings.

关键词： Electrospinning Wound healing Fiber alignment Biomaterials Nanofiber dressing Bacterial infections

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Electron Ptychography for Investigating Magnetic Textures in Micro- and Nano- Scale Magnets via Lorentz Transmission Electron Microscopy

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1847-1848页

作者： Trujillo, Kayna L Mendoza Divan, Ralu N S Li, Yue Jiang, Yi McCray, Arthur R C Petford-Long, Amanda K. Phatak, Charudatta Department of Materials Science and Engineering Northwestern University Evanston IL United States Materials Science Division Argonne National Laboratory Lemont IL United States Center for Nanoscale Materials Argonne National Laboratory Lemont IL United States Advanced Photon Source Argonne National Laboratory Lemont IL United States Applied Physics Program Northwestern University Evanston IL United States

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Microstructural and Interfacial Characteristics of Supersonic/Kinetically Reclaimed 2024al-T3 Substrate Using Cold Sprayed 2024al Deposit

SSRN

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SSRN 2024年

作者： Zhong, Yuan Zhang, Yingpeng Liu, Zhihao Ramachandran, Chidambaram Seshadri Cha, Limei Wang, Qun College of Materials Science and Engineering Hunan University Hunan Changsha410082 China The Material Science and Engineering Program Guangdong Technion Israel Institute of Technology Shantou515063 China Department of Materials Science and Engineering The State University of New York Stony BrookNY11794 2275 United States

This work systematically investigated the microstructure and interfacial characteristics of cold sprayed (CS) 2024Al coating on 2024Al-T3 substrate. Within the internal structure of the layer, recrystallization processes induced by intense stress were seen, resulting in the formation of nanograins with sizes ranging from 30-100 nm, as well as ultrafine grains with sizes ranging from 100-300 nm. Different bonding modes of splat/splat, including mechanical bonding, mechanical interlocking, and metallurgical bonding, have been found at the interface between splat/substrate. There were no apparent pores and gaps between the particles in the mechanical bonding area and between the coating and the substrate. In regions of metallurgical bonding, adiabatic shear instability promoted the occurrence of continuous dynamic recrystallization (CDRX) on the one hand, leading to viscous flow of local materials, which damaged the original splat/substrate bonding surface and generating new bonding surfaces, on the other hand, promoted atomic diffusion between the coating and the substrate, allowing a close lattice match formed at the splat/substrate interface. Therefore, the CS 2024Al coating exhibited excellent comprehensive properties with a porosity level of 0.31±0.09%, a hardness of 143.4 HV0.025, and an adhesion/cohesion strength exceeding 55.5 MPa. These properties were derived from the strong bonding among splats and between the splats and the substrate. © 2024, The Authors. All rights reserved.

关键词： Shear flow

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Evidence of magnetoelectronic electromagnon-mediated transport in flexoelectronic heterostructures

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Physical Review B 2023年第16期107卷 165305-165305页

作者： Anand Katailiha Paul C. Lou Ravindra G. Bhardwaj W. P. Beyermann Sandeep Kumar Department of Mechanical Engineering University of California Riverside California 92521 USA Department of Physics and Astronomy University of California Riverside California 92521 USA Materials Science and Engineering Program University of California Riverside California 92521 USA

The superposition of atomic vibrations and flexoelectronic effect gives rise to a cross correlation between free charge carriers and temporal magnetic moment of phonons in conducting heterostructures under an applied strain gradient. The resulting dynamical coupling is expected to give rise to quasiparticle excitations called magnetoelectronic electromagnons that carry electronic charge and temporal magnetic moment. Here, we report experimental evidence of magnetoelectronic electromagnons in the freestanding degenerately doped p-Si based heterostructure thin film samples. These quasiparticle excitations give rise to long-distance (>100 μm) spin transport, demonstrated using spatially modulated transverse magnetothermoelectric and nonlocal resistance measurements. The magnetoelectronic electromagnons are nonreciprocal and give rise to large magnetochiral anisotropy (0.352A−1T−1) that diminishes at lower temperatures. The superposition of nonreciprocal magnetoelectronic electromagnons gives rise to longitudinal and transverse modulations in charge carrier density, spin density, and magnetic moment, demonstrated using the Hall effect and edge dependent magnetoresistance measurements, which can also be called inhomogeneous magnetoelectronic multiferroic effect. These quasiparticle excitations are analogous to photons where time dependent polarization and temporal magnetic moment replace electric and magnetic field, respectively, and most likely topological because they manifest topological Nernst effect. Hence, the magnetoelectronic electromagnon can potentially give rise to quantum interference and entanglement effects in conducting solid state systems at room temperature in addition to efficient spin transport.

关键词： Flexoelectricity Magnetic coupling Magnetotransport Spin current Spin-phonon coupling Doped semiconductors Multiferroics

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Novel Enclosed Delamination Injection Repair Process for Strength Restoration 37

Novel Enclosed Delamination Injection Repair Process for Str...

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37th Technical Conference of the American Society for Composites, ASC 2022

作者： Massey, Justin Romasko, Barrett Kim, Hyonny Materials Science and Engineering Program University of California La Jolla San DiegoCA92093 United States Department of Structural Engineering University of California La Jolla San DiegoCA92093 United States

ISBN: (纸本)9781605956909

Delaminations are a common damage mechanism that occurs on composite structures due to in-service impacts. Enclosed damages less than 50 mm in diameter are of particular interest for repair. Current practices for repair of delaminations include: cut out of the damage and applying a patch or doubler to the cutout site, or injection using a repair resin. The use of a bonded doubler repair is more invasive and requires a cutout that acts as a stress concentration in the area of the repair. Injection repairs have traditionally been a faster, less expensive way to repair composite delaminations. However, the aerospace industry has not accepted injection repair as a strength restorative process. Questions about quantifying delamination internal contamination and ensuring percentage of repair resin fill within a delamination have been primary reasons why injection repairs have not been credited with strength restoration. Development of a new quantitative internal surface cleaning, preparation and repair process for delaminated composite materials is required to provide justification for strength restoration using injection repair. Fabricating representative local delaminations was performed with a modified end-notch flexure (ENF) test. A unidirectional 24-ply panel was fabricated to simulate damage to laminates. Intentional contamination was introduced into the induced delamination of each panel type. Contamination removal and surface preparation using solvent and atmospheric plasma cleaning were completed on the modified ENF coupon and verified utilizing in-line monitoring with Quantitative Gas Analysis (QGA) and post processing inspection with Fourier Transform Infrared Spectroscopy (FTIR). A modified low-viscosity injection resin was developed and utilized to repair the post-tested ENF coupons. The modified epoxy exhibited comparable shear strength characteristics to un-modified neat resin while achieving a >97% reduction in viscosity. Each ENF panel type was assessed f

关键词： Resins

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Zinc-Doping-Induced Electronic States Modulation of Molybdenum Carbide: Expediting Rate-Determining Steps of Sulfur Conversion in Lithium-Sulfur Batteries

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Advanced science 2025年第0期 e2417126页

作者： Qin, Bin Li, Yanmei Wang, Qun Zhang, Si Zhang, Jinglin Wang, Bin Wang, Peijia Chen, Yuhan Yao, Weiqi Wang, Fang Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education & School of Chemistry and Materials Science Shanxi Normal University Taiyuan030001 China Shanxi Key Laboratory of Advanced Magnetic Materials and Devices & Research Institute of Materials Science of Shanxi Normal University Taiyuan030001 China Basic Department Shanxi Agricultural University Jinzhong030801 China School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China Department of Mechanical Engineering City University of Hong Kong 999077 Hong Kong Materials Science and Engineering Program & Texas Materials Institute The University of Texas at Austin AustinTX78712 United States

Enhancing Li2S deposition and oxidation kinetics in lithium-sulfur batteries, especially the potential-limiting step under lean electrolyte, can be effectively achieved by developing conductive catalysts. In this study, by using ZnMoO4 as precursors, Zn-doped molybdenum carbide microflowers (Zn-Mo2C) composed of speared porous sheets are fabricated with a hierarchically ordered structure. Density functional theory calculations indicate that Zn doping shifts the d-band center on Mo atoms in Mo2C upward, promotes the elevation of certain antibonding orbitals in Mo─S bonds above the Fermi level, enhances d-p interaction between lithium polysulfides (LiPSs) and catalysts, weakens both S─S and Li─S bonds of LiPSs. Incorporating Zn significantly reduces the Gibbs free energy barrier for the rate-limiting step of the Li2S2 → Li2S conversion, from 0.52 eV for Mo2C to just 0.05 eV for Zn-doped Mo2C. Thus, the synthesized Zn-Mo2C demonstrates impressive bifunctional electrocatalytic performance, significantly advancing sulfur reduction and Li2S decomposition. Moreover, this modification enhances charge transfer within the Zn-Mo2C/LiPSs system, synergistically accelerating the kinetics of Li2S4 to Li2S reduction and Li2S oxidation. The Zn-Mo2C/S cathode demonstrates impressive electrochemical performance, achieves remarkable cycling stability with a minimal capacity decay of 0.021% per cycle over 1000 cycles at 5 C, underscoring its potential for high-energy applications. © 2025 The Author(s). Advanced science published by Wiley-VCH GmbH.

关键词： Gibbs free energy

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First principles derivation of a Rayleigh Gans Debye model for scattering from anisotropic inhomogeneities

arXiv

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arXiv 2023年

作者： Shachar, M.H. Garay, J.E. Materials Science & Engineering Program Mechanical & Aerospace Engineering Department University of California San Diego La Jolla CA United States

Scattering problems are important in describing light propagation in wide ranging media such as the atmosphere, colloidal solutions, metamaterials, glass ceramic composites, transparent polycrystalline ceramics, and surfaces. The Rayleigh-Gans-Debye (RGD) approximation has enjoyed great success in describing a wide range of scattering phenomena. We derive a generalized RGD formulation from the perturbation of Maxwell’s equations. In contrast to most treatments of RGD scattering, our formulation can model any soft scattering phenomena in linear media, including scattering by stochastic process, lossy media, and by anisotropic inhomogeneities occurring at multiple length scales. Our first-principles derivation makes explicit underlying assumptions and provides jumping-off points for more general treatments. The derivation also facilitates a deeper understanding of soft scattering. It is demonstrated that sources of scattering are not interfaces as is often presumed, but excess accelerating charges emitting uncompensated radiation. Approximations to the equations are also presented and discussed. For example, the scattering coefficient in the large-size RGD limit is shown to be proportional to the correlation length and the variance of a projected phase shift. © 2023, CC BY.

关键词： Random processes

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Light-driven single-cell rotational adhesion frequency assay

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eLight 2022年第1期2卷 154-164页

作者： Yaoran Liu Hongru Ding Jingang Li Xin Lou Mingcheng Yang Yuebing Zheng Department of Electrical and Computer Engineering The University of Texas at AustinAustinTX 78712USA Walker Department of Mechanical Engineering The University of Texas at AustinAustinTX 78712USA Materials Science&Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX 78712USA School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808GuangdongChina Department of Biomedical Engineering The University of Texas at AustinAustinTX 78712USA

The interaction between cell surface receptors and extracellular ligands is highly related to many physiological processes in living *** techniques have been developed to measure the ligand-receptor binding kinetics at the single-cell ***,few techniques can measure the physiologically relevant shear binding affinity over a single cell in the clinical ***,we develop a new optical technique,termed single-cell rotational adhesion frequency assay(scRAFA),that mimics in vivo cell adhesion to achieve label-free determination of both homogeneous and heterogeneous binding kinetics of targeted cells at the subcellular ***,the scRAFA is also applicable to analyze the binding affinities on a single cell in native human *** its superior performance and general applicability,scRAFA is expected to find applications in study of the spatial organization of cell surface receptors and diagnosis of infectious diseases.

关键词： diagnosis kinetics rotational

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Ultrahigh zT from strong electron-phonon interactions and a low-dimensional Fermi surface

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Energy and Environmental science 2024年第5期17卷 1904-1915页

作者： Ranganayakulu, V.K. Wang, Te-Hsien Chen, Cheng-Lung Huang, Angus Ma, Ma-Hsuan Wu, Chun-Min Tsai, Wei-Han Hung, Tsu-Lien Ou, Min-Nan Jeng, Horng-Tay Lee, Chih-Hao Chen, Kuei-Hsien Li, Wen-Hsien Brod, Madison K. Snyder, G. Jeffrey Chen, Yang-Yuan Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu30013 Taiwan Taiwan International Graduate Program Taipei11529 Taiwan Department of Physics National Chung Hsing University Taichung City40227 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology Yunlin64002 Taiwan Bachelor Program in Semiconductor Materials and Fabrication Ming Chi University of Technology New Taipei City243303 Taiwan Department of Physics National Tsing Hua University Hsinchu30013 Taiwan Center for Theory and Computation National Tsing Hua University Hsinchu30013 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Department of Physics National Central University Jhongli32001 Taiwan National Synchrotron Radiation Research Center Hsinchu Science Park Hsinchu30076 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Graduate Institute of Applied Physics National Chengchi University Taipei11605 Taiwan

The outstanding thermoelectric performance of GeTe has attracted significant attention in the research community in recent years. However, many of the underlying physical mechanisms that contribute to GeTe's exceptionally high figure of merit (zT) remain not fully understood. In this study, an Sb-Bi codoped GeTe single crystal (Ge0.86Sb0.08Bi0.06)Te with an ultrahigh zT of 2.7 at 700 K and a record high device zT of 1.41 in the temperature range of 300-773 K was synthesized and investigated. The ultrahigh zT is attributed to the extremely low lattice thermal conductivity induced by strong electron-phonon (EP) interactions as revealed by the experimentally observed Kohn anomaly, through inelastic neutron scattering (INS) measurements. First-principles calculations further demonstrate that the remarkable EP interaction arises from the Fermi surface nesting featured in a one-dimensional (double-walled) topology. Our finding unravels the ultrahigh-zT mechanism in GeTe-based materials, serving as an inspiring guide toward high thermoelectric performance. © 2024 The Royal Society of Chemistry.

关键词： Neutron scattering

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Elevated Temperature Deposition of Metal (Nb, Ti) – Max (Ti2alc) Phase Nanolaminates: Synthesis, Microstructure and Micro-Mechanical Characterization

SSRN

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SSRN 2024年

作者： Supakul, Skye Jain, Manish Yaddanapudi, Krishna Gruber, Jacob El-Atwani, Osman Tucker, Garritt J. Pathak, Siddhartha Materials Science and Engineering Department Iowa State University IA50011 United States Laboratory for Mechanics of Materials and Nanostructures Department of Materials Science and Engineering University of California DavisCA95616 United States Materials Science Program Colorado School of Mines GoldenCO80401 United States Materials Science and Technology Division Department of Physics Baylor University WacoTX76706 United States

We utilize elevated temperature physical vapor deposition techniques to design metal/MAX multilayered nanocomposite thin films with alternating nanoscale metallic (Nb, Ti) and MAX phase (Ti2AlC) layer thicknesses. These metal/MAX nanolaminate architectures attempt to exploit a unique hierarchical topology – as interfaces between the layers are expected to be in direct competition with the internal interfaces within the MAX layers, to drive their tunable macroscopic mechanical behavior. Our first deposition attempt with the Nb/Ti2AlC metal/MAX system showed highly diffused layer interfaces with distinct Ti rich and Nb-Al rich layers, with the presence of MAX phase alongside TiC and other Ti-Al and Nb-Al intermetallic phases. The Nb/Ti2AlC system possessed a layered architecture, though the MAX phases were not found to be continuously present in each alternating layer. The second Ti/Ti2AlC system showed a non-lamellar nanocomposite microstructure and the formation of mixed Tin+1AlCn phases (a mix of n = 1, 2), and no indication of layering. Diffusion occurring between the metal/MAX layers in both cases, likely due to the elevated temperatures during the deposition process, is speculated as the likely cause of these resultant microstructures. The mechanical properties of both systems were evaluated using micromechanical (nanoindentation and micro-pillar compression) techniques, and were found to be within the bounds predicted by composite theory for the Nb system (yield and instability strengths of 4.88±0.1 GPa and 5.57±0.03 GPa ) and just short of expectations for the Ti system (yield and instability strength of 5.61±0.28 GPa and 6.21±0.25 GPa). This work provides important insights for future depositions, such as the need to effectively block/mitigate interlayer diffusion by either lowering the deposition temperature or adding a third layer that can act as a diffusion barrier. © 2024, The Authors. All rights reserved.

关键词： Nanocomposites

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