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Injectable citrate-based polyurethane-urea as a tug-of-war-inspired bioactive self-expansive and planar-fixing screw augmented bone-tendon healing

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Bioactive materials 2024年第11期41卷 108-126页

作者： Meihan Tao Zhou Fang Yuting Zhu Yan Ju Zhiguo Hou Meimei Fu Zhihui Lu Daozhang Cai Jian Yang Jinshan Guo Department of Orthopedic Surgery Guangdong Provincial Key Laboratory of Bone and Joint Degeneration DiseasesThe Third Affiliated Hospital of Southern Medical UniversityGuangzhou510630PR China Department of Histology and Embryology NMPA Key Laboratory for Safety Evaluation of CosmeticsSchool of Basic Medical SciencesSouthern Medical UniversityGuangzhou510515PR China Regenerative Medicine and Tissue Repair Material Research Center Huangpu Institute of MaterialsGuangzhou New Materials Science CenterChangchun Institute of Applied ChemistryChinese Academy of Sciences88 Yonglong Avenue of Xinlong TownGuangzhou511363PR China Research Center for Industries of the Future Biomedical Engineering ProgramSchool of EngineeringWestlake UniversityHangzhouZhejiang310030PR China CAS Key Laboratory of High-Performance Synthetic Rubber and its Composite Materials Changchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun130022PR China

Inspired by tug-of-war,a game-changing bone-tendon fixation paradigm was ***,injectable citrate-based bioactive self-expansive and planar-fixing screw(iCSP-Scr)consisting of reactive isocyanate(NCO)terminalized citrate-based polyurethane,proanthocyanidin modified hydroxyapatite(HAp)and water(with/without porogen)was developed and administrated in the bone-tendon *** of the“point to point”tendon fixation by traditional interface screws,along with the moisture-induced crosslinking and expansion of iCSP-Scr within the confined space of the irregularly shaped bone-tendon gap,the tendon graft was evenly squeezed into the bone tunnel in a“surface to surface”manner to realize strong and stable bone-tendon fixation via physical expansion,mechanical interlocking and chemical bonding(between–NCO and the–NH2,–SH groups on bone matrix).The optimized iCSP-Scr exhibited rapid crosslinking,moderate expansion rate,high porosity after crosslinking,as well as tunable elasticity and *** iCSP-Scr possessed favorable biodegradability,biocompatibility,and osteoinductivity derived from citrate,PC and HAp,it was able to promote osteogenesis and new bone growth inward of bone tunnel thus further enhanced the bone/iCSP-Scr mechanical interlock,ultimately leading to stronger tendon fixation(pull-out force 106.15±23.15 N)comparing to titanium screws(93.76±17.89 N)after 14 weeks’ACL reconstruction in a rabbit *** iCSP-Scr not only can be used as a self-expansive screw facilitating bone-tendon healing,but also can be expanded into other osteogenic application scenarios.

关键词： Polyurethane Injectable Self-expansive Planar-fixing Citrate

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Surrogate models for the magnitude of convection in droplets levitated through EML, ADL, and ESL methods

arXiv

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arXiv 2023年

作者： Usui, Takuro Shiratori, Suguru Tanimoto, Kohei Ozawa, Shumpei Ishikawa, Takehiko Suzuki, Shinsuke Nagano, Hideaki Shimano, Kenjiro Graduate School of Integrative Science and Engineering Tokyo City University Tokyo Japan Department of Mechanical Systems Engineering Tokyo City University Tokyo Japan Department of Advanced Materials Science and Engineering Chiba Institute of Technology Chiba Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Ibaraki Tsukuba Japan Department of Materials Science Department of Applied Mechanics and Aerospace Engineering Kagami Memorial Research Institute for Materials Science and Technology Waseda University Tokyo Japan

Fluid flow and heat transfer in levitated droplets were numerically investigated. Three levitation methods: electro-magnetic levitation (EML), aerodynamic levitation (ADL), and electro-static levitation (ESL) were considered, and conservative laws of mass, momentum, and energy were applied as common models. The Marangoni effect was applied as a velocity boundary condition, whereas heat transfer and radiation heat loss were considered as thermal boundary conditions. As specific models to EML, the Lorentz force and Joule heat were calculated based on the analytical solution of the electromagnetic field. For ADL model, besides the Marangoni effect, the flow driven by the surface shear force was considered. For ADL and ESL models, the effect of laser heating was introduced as a boundary condition. All the equations were nondimensionalized using common scales for all three levitations. Numerical simulations were performed for several materials and droplet sizes, and the results were evaluated in terms of the Reynolds number based on the maximum velocity of the flow in the droplet. The order of magnitude of Reynolds numbers was evaluated as Re ∼ 104 for EML, Re ∼ 103 for ADL, and Re ∼ 101 for ESL. Based on the simulation results, we proposed simple formulas for predicting the Reynolds number of droplet internal convection using combinations of nondimensional numbers determined from physical properties of the material and the driving conditions. The proposed formulas can be used as surrogate models to predict the Reynolds numbers, even for materials other than those used in this study. © 2023, CC BY.

关键词： Reynolds number

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Output Characteristics on Kirigami Thermoelectric Generator by Three-Dimensional Deformation and Geometric Shapes

Output Characteristics on Kirigami Thermoelectric Generator ...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： Shingo Terashima Eiji Iwase Department of Applied Mechanics and Aerospace Engineering Waseda University Tokyo Japan Kagami Memorial Research Institute for Materials Science and Technology Waseda University Tokyo Japan

We have evaluated the output characteristics of a flexible thermoelectric generator (TEG) with high output power by a kirigami structure. The feature of the kirigami structure is that the low-temperature side substrate and the thermoelectric (TE) element standing-up in the height direction (the direction away from the heat source). Therefore, we investigated the effects of (i) three-dimensional standing-up deformation of the kirigami-TEG and (ii) the aspect ratio of TE elements, and (ⅲ) the width of the low-temperature side substrate on output characteristics.

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Impact of In flux on self-assembled InGaN/GaN superlattice grown on GaN template by plasma-assisted molecular beam epitaxy

Impact of In flux on self-assembled InGaN/GaN superlattice g...

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2022 Compound Semiconductor Week, CSW 2022

作者： Khan, Kamruzzaman Sun, Kai Wurm, Christian Ahmadi, Elaheh University of Michigan Department of Materials Science and Engineering Ann ArborMI United States University of California Department of Electrical and Computer Engineering Santa BarbaraCA United States University of Michigan Department of Electrical Engineering and Computer Science Ann ArborMI United States University of Michigan Applied Physics Program Ann ArborMI United States

ISBN: (数字)9781665453400

ISBN: (纸本)9781665453400

We have previously reported spontanous formation of InGaN/GaN superlattice structure on nominal InGaN films grown by plasma-assisted molecular beam epitaxy (PAMBE). In this work, we report on the impact of In flux on the formation and periodicity of self-assembled InxGa1-xN/InyGa1-yN superlattice structure (SASL). We show that the thickness and In composition in the InGaN layer varies by changing the In flux. These films were stucturally characterized by X-ray diffraction and simulated by globalfit software to get the thickness and In composition. The superlattice structures were confimred by scanning transmission electron microscopy and the thickness of InGaN layer and In composition were determined by energy dispersive X-ray spectroscopy. This work can provide a method for using the SASL with better control for their optoelectronics application. © 2022 IEEE.

关键词： III-V semiconductors

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Evaluation Method of Out-of-Plane Deformation on Kirigami Structure with Repetitive Slit Patterns on Concentric Circles

Evaluation Method of Out-of-Plane Deformation on Kirigami St...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： Miyako Mizuna Eiji Iwase Department of Applied Mechanics and Aerospace Engineering Waseda University Tokyo Japan Kagami Memorial Research Institute for Materials Science and Technology Waseda University Tokyo Japan

We proposed an evaluation method and quantitative index for the radial distribution of out-of-plane deformation of kirigami structures with a slit pattern on concentric circles. The concentric kirigami structure is deformed into the out-of-plane direction by pulling the center of the structure, and the out-of-plane deformation distribution in the radial direction can be changed by changing the parameters. In this paper, we expressed the radial distribution of this out-of-plane deformation using a single quantitative index. If the design of the kirigami structure can be freely determined from the quantification index, it can contribute greatly to the realization of useful Micro-Electro-Mechanical Systems (MEMS) devices.

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Self-Healing Metal Interconnect Using Silicone oil Dispersed with Copper Nanoparticles

Self-Healing Metal Interconnect Using Silicone oil Dispersed...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： Akane Umeda Naoki Suetsugu Wakana Akema Eiji Iwase Department of Applied Mechanics and Aerospace Engineering Waseda University Tokyo Japan Kagami Memorial Research Institute for Materials Science and Technology Waseda University Tokyo Japan

We achieved a self-healing metal interconnect using low-volatility liquid silicone oil as a dispersant and copper nanoparticles as metal nanoparticles. We clarified that we have to distinguish between physical bridging and electrical connection because of an oxide layer of copper nanoparticles when silicone oil dispersed with copper nanoparticles is used in self-healing metal interconnects. As a result, we have successfully classified self-healing types depending on the applied voltage and the energy of Joule heating.

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Superior Strength–Ductility Synergy in Three-Dimensional Heterogeneous-Nanostructured Metals

SSRN

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SSRN 2023年

作者： Li, Guodong Jiang, Jiaxi Ma, Huachun Zheng, Ruixiao Gao, Si Zhao, Shiteng Ma, Chaoli Ameyama, Kei Ding, Bin Li, Xiaoyan Research Institute for Frontier Science Beihang University Beijing100191 China School of Materials Science and Engineering Beihang University Beijing100191 China Center for Advanced Mechanics and Materials Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Beijing100084 China Department of Materials Science and Engineering Kyoto University Kyoto606-8501 Japan Tianmushan Laboratory Xixi Octagon City Yuhang District Hangzhou310023 China Department of Mechanical Engineering Faculty of Science and Engineering Ritsumeikan University Shiga525-8577 Japan Institute of Solid Mechanics Beihang University Beijing100191 China

Heterogeneous microstructural design has been proven to be an effective strategy in breaking the strength–ductility dilemma in nanostructured metals. However, the precise control of heterogeneous microstructures to achieve strength–ductility synergy remains challenging. Here, we demonstrate a novel powder metallurgy approach for creating three-dimensional (3D) core–shell nanostructures with highly tunable grain size distributions. These 3D nanostructures enable superior strength–ductility synergy in pure copper, pushing the boundary of the Ashby map to unchartered territory. A combination of microstructural characterization, atomistic simulations and crystal plasticity modeling reveals that the generation and accumulation of geometrically necessary dislocations near the core–shell interface play a pivotal role in accommodating the strain gradient and sustaining a high strain-hardening rate during plastic deformation. Our work provides a viable approach for designing bulk nanostructured materials with 3D heterogeneous ingredients and demonstrates a promising pathway for the development of strong and ductile materials. © 2023, The Authors. All rights reserved.

关键词： Strain rate

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Challenges of measuring spin Seebeck noise

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Physical Review B 2024年第10期109卷 104429-104429页

作者： Renjie Luo Xuanhan Zhao Tanner J. Legvold Liyang Chen Changjiang Liu Deshun Hong Anand Bhattacharya Douglas Natelson Department of Physics and Astronomy Rice University Houston Texas 77005 USA Applied Physics Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Department of Materials Science and NanoEngineering Rice University Houston Texas 77005 USA

Just as electronic shot noise in driven conductors results from the granularity of charge and the statistical variation in the arrival times of charge carriers, there are predictions for fundamental noise in magnon currents due to angular momentum being carried by discrete excitations. The inverse spin Hall effect as a transduction mechanism to convert spin current into charge current raises the prospect of experimental investigations of such magnon shot noise. Spin Seebeck effect measurements have demonstrated the electrical detection of thermally driven magnon currents and have been suggested as an avenue for accessing spin current fluctuations. Using spin Seebeck structures made from yttrium iron garnet on gadolinium gallium garnet, we demonstrate the technical challenges inherent in such noise measurements. While there is a small increase in voltage noise in the inverse spin Hall detector at low temperatures associated with adding a magnetic field, the dependence on field orientation implies that this is not due to magnon shot noise. We describe theoretical predictions for the expected magnitude of magnon shot noise, highlighting ambiguities that exist. Further, we show that magnon shot noise detection through the standard inverse spin Hall approach is likely impossible due to geometric factors. Implications for future attempts to measure magnon shot noise are discussed.

关键词： Spin Seebeck effect Spin current Magnetic insulators Noise measurements

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Perovskite bridging PbS quantum dot/polymer interface enables efficient solar cells

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Nano Research 2022年第7期15卷 6121-6127页

作者： Xing Meng Yifan Chen Fan Yang Jieqi Zhang Guozheng Shi Yannan Zhang Haodong Tang Wei Chen Yang Liu Lin Yuan Shaojuan Li Kai Wang Qi Chen Zeke Liu Wanli Ma Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and PhysicsChangchun 130033China i-Lab CAS Center for Excellence in NanoscienceSuzhou Institute of Nano-Tech and Nano-BionicsSuzhou 215123China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China

Conjugated polymers have been explored as promising hole-transporting layer(HTL)in lead sulfide(PbS)quantum dot(QD)solar *** fine regulation of the inorganic/organic interface is pivotal to realize high device *** this work,we propose using CsPbI_(3) QDs as the interfacial layer between PbS QD active layer and organic polymer *** relative soft perovskite can mediate the interface and form favorable energy level alignment,improving charge extraction and reducing interfacial charge *** a result,the photovoltaic performance can be efficiently improved from 10.50%to 12.32%.This work may provide new guidelines to the device structural design of QD optoelectronics by integrating different solutionprocessed semiconductors.

关键词： lead sulfide quantum dot solar cells perovskite energy level alignment

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An atomistic model of silk protein network for studying the effect of pre-stretching on the mechanical performances of silks

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Acta Mechanica Sinica 2022年第6期38卷 55-68,I0001页

作者： Wenhui Shen Zihan Tang Xuwei Wu Liang Pan Yuan Cheng Bo Huo Jizhou Song Weiqiu Chen Baohua Ji Dechang Li Biomechanics and Biomaterials Laboratory Department of Applied MechanicsBeijing Institute of TechnologyBeijing100081China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering MechanicsZhejiang UniversityHangzhou310027China Innovative Centre for Flexible Devices(iFLEX) School of Materials Science and EngineeringNanyang Technological UniversitySingapore639798Singapore Monash Suzhou Research Institute Monash UniversitySuzhou215000China Department of Materials Science and Engineering Monash UniversityMelbourne3800Australia

Silk protein builds one of the strongest natural fibers based on its complex nanocomposite ***,the mechanical performance of silk protein,related to its molecular structure and packing is still *** this study,we constructed an atomistic silk protein network model,which reproduces the extensive connection topology of silk protein with structure details of theβ-sheet crystallites and amorphous *** the silk protein network model,we investigated the structure evolution and stress distribution of silk protein under external *** found a pre-stretching treatment during the spinning process can improve the strength of silk *** treatment improves the properties of silk protein network,i.e.,increases the number of nodes and bridges,makes the nodes distributed homogeneously,and induces the bridges in the network well aligned to the loading direction,which is of great benefit to the mechanical performances of silk *** study not only provides a realized atomistic model for silk protein network that well represents the structures and deformations of silk proteins under loading,but also gains deep insights into the mechanism how the pre-loading on silk proteins during spinning improves the mechanical properties of silk fibers.

关键词： Silk protein Amorphous domain β-sheet crystallite Mechanical performances Molecular dynamics

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