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NATURE REVIEWS METHODS PRIMERS 2024年第1期4卷 1页

作者： [Anonymous] Biomimetic Design Laboratory Department of Physics Northeastern University Boston MA USA Process Imaging Laboratory Institute of Materials Science and Technology Technische Universität Berlin Berlin Germany Process Imaging Laboratory Institute of Applied Materials Helmholtz-Zentrum Berlin für Materialien und Energie Berlin Germany Laboratory of Micro and Materials Mechanics Department of Microsystems Engineering University of Freiburg Freiburg Germany

This PrimeView highlights the structures formed with different freeze casting moulds.

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Polyetheretherketone (PEEK) Implant Functionalization with Magnetron-Sputtered SrTiO3 for Regenerative Medicine

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Plasma Medicine 2023年第3期13卷 53-67页

作者： Harumningtyas, Anjar Anggraini Ito, Tomoko Ikuta, Masato Kaito, Takashi Hamaguchi, Satoshi International Priority Graduate Program on Applied and Engineering Physics Division of Precision Engineering and Applied Physics Osaka University Osaka Japan Yogyakarta Indonesia Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Osaka Japan Department of Orthopaedic Surgery Osaka University Graduate School of Medicine Osaka Japan

Polyetheretherketone (PEEK) is a polymer widely used for artificial bone implants but exhibits a low affinity for bone tissue and lacks osteoconductivity and osseointegration. Because strontium (Sr) is known to enhance bone growth, PEEK implants coated with strontium titanate [SrTiO3 (STO)] are expected to improve the bone growth around them. In this study, STO was deposited on model PEEK implants by magnetron sputtering deposition and its ability to release Sr2+ ions to a surrounding phosphate-buffered saline (PBS) solution was examined. It was found that, in the early stage of the deposition process, STO on a PEEK surface exhibits irregular surface structures with many holes. The amount of Sr stored in the STO film increases with the increasing film thickness but the release rate of Sr2+ ions from the STO film to the surrounding PBS also increases with the film thickness, limiting the duration of effectiveness of the STO-coated PEEK films. It was found, however, that a three-layer titanium (Ti)-STO-Ti film deposited on PEEK allows a steady release of Sr2+ ions to the surrounding PBS for an extended period. © 2023 by Begell House, Inc. ***.

关键词： Titanium compounds

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Imaging and Understanding 3D Nanoscale Magnetic Structures

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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 1398-1399页

作者： Petford-Long, Amanda K. Brajuskovic, Vuk Li, Yue McCray, Arthur R C Phatak, Charudatta Materials Science Division Argonne National Laboratory Lemont IL United States Materials Science and Engineering Department Northwestern University Evanston IL United States Applied Physics Program Northwestern University Evanston IL United States

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Low-temperature spin Seebeck effect in nonmagnetic vanadium dioxide

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Physical Review B 2024年第2期110卷 024415-024415页

作者： Renjie Luo Tanner J. Legvold Liyang Chen Henry Navarro Ali C. Basaran Deshun Hong Changjiang Liu Anand Bhattacharya Ivan K. Schuller Douglas Natelson Department of Physics and Astronomy Applied Physics Graduate Program Rice Quantum Institute Department of Physics and Center for Advanced Nanoscience Materials Science Division Department of Electrical and Computer Engineering Department of Materials Science and NanoEngineering

The spin Seebeck effect (SSE) is sensitive to thermally driven magnetic excitations in magnetic insulators. Vanadium dioxide in its insulating low-temperature phase is expected to lack magnetic degrees of freedom, as vanadium atoms are thought to form singlets upon dimerization of the vanadium chains. Instead, we find a paramagnetic SSE response in VO2 films that grows as the temperature decreases below 50 K. The field and temperature-dependent SSE voltage is qualitatively consistent with a general model of paramagnetic SSE response and inconsistent with triplet spin transport. Quantitative estimates find a spin Seebeck coefficient comparable in magnitude to that observed in strongly magnetic materials. The microscopic nature of the magnetic excitations in VO2 requires further examination.

关键词： Spin Seebeck effect Paramagnets Strongly correlated systems

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Flexible piezoelectret film sensor for noncontact mechanical signal capture by multiple transmission media

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Nano Research 2024年第8期17卷 7643-7657页

作者： Xingchen Ma Qianqian Hu Lian Zhou Xinhao Xiang Yi Qin Ke Zhang Pengfei He Ying Dai Wenxin Niu Xiaoqing Zhang Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Yangzhi Rehabilitation Hospital(Shanghai Sunshine Rehabilitation Center) School of MedicineTongji UniversityShanghai 201619China Department of Rehabilitation Sciences Tongji University School of MedicineShanghai 200092China School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China

Mechanical signal capture without physical contact has emerged as a highly promising research field and attracted tremendous attention due to its prosperous applications in household medical care,lifestyle monitoring and remote operation,offering users high level of safety,convenience and ***,noncontact sensing is ideal to maximize the immersive user experience in the human–machine interaction(HMI),eliminating interference to human activities and mechanical fatigue to the sensor,***,we report a self-powered flexible sensor integrated with irradiation cross-linked polypropylene(IXPP)piezoelectret film for noncontact sensing,featuring multi-functions to detect mechanical signals transmitted through solid,liquid and gaseous media and would facilitate their versatile practical *** folded-structure configuration of the sensor facilitates the improvement of the noncontact sensing *** solid media,such as the rectangular wooden stick used in this study,the sensor can detect mechanical stimulus exerted at a distance of 100 cm.A system detection sensitivity up to 57 pC/kPa with a low detection limit of 0.6 kPa is achieved at a noncontact distance of 10 *** when partly or completely immersed in water,the sensor effectively traces movement signals of human bodies underwater,demonstrating great advantages for non-inductive aquatic fitness training ***,due to the low acoustic impedance of piezoelectret film,speech recognition through gaseous medium is also *** further introduce application demonstrations of the developed film sensors to monitor exercise postures and physiological signals without direct contact between human body and the sensor,displaying great potential to be incorporated into future smart *** study commendably expands the application scope of piezoelectret materials,which will have profound implications for exploring novel intelligent human–machine interactions.

关键词： noncontact sensing piezoelectret multiple transmission media mechanical signal capture

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Fluorinated amphiphilic Poly(β-Amino ester)nanoparticle for highly efficient and specific delivery of nucleic acids to the Lung capillary endothelium

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Bioactive materials 2024年第1期31卷 1-17页

作者： Zicheng Deng Wen Gao Fatemeh Kohram Enhong Li Tanya V.Kalin Donglu Shi Vladimir V.Kalinichenko Phoenix Children’s Health Research Institute Department of Child HealthUniversity of Arizona College of Medicine-PhoenixPhoenixAZ85004USA Division of Pulmonary Biology Cincinnati Children’s Hospital Medical CenterCincinnatiOH45229USA The Materials Science and Engineering Program College of Engineering and Applied ScienceUniversity of CincinnatiCincinnatiOH45221USA Division of Neonatology Phoenix Children’s HospitalPhoenixAZ85016USA

Endothelial cell dysfunction occurs in a variety of acute and chronic pulmonary diseases including pulmonary hypertension,viral and bacterial pneumonia,bronchopulmonary dysplasia,and congenital lung diseases such as alveolar capillary dysplasia with misalignment of pulmonary veins(ACDMPV).To correct endothelial dysfunction,there is a critical need for the development of nanoparticle systems that can deliver drugs and nucleic acids to endothelial cells with high efficiency and *** several nanoparticle delivery systems targeting endothelial cells have been recently developed,none of them are specific to lung endothelial cells without targeting other organs in the *** the present study,we successfully solved this problem by developing non-toxic poly(β-amino)ester(PBAE)nanoparticles with specific structure design and fluorinated modification for high efficiency and specific delivery of nucleic acids to the pulmonary endothelial *** intravenous administration,the PBAE nanoparticles were capable of delivering non-integrating DNA plasmids to lung microvascular endothelial cells but not to other lung cell *** whole body imaging and flow cytometry demonstrated that DNA plasmid were functional in the lung endothelial cells but not in endothelial cells of other *** of PBAE was required for lung endothelial cell-specific *** analysis and liver and kidney metabolic panels demonstrated the lack of toxicity in experimental ***,fluorinated PBAE nanoparticles can be an ideal vehicle for gene therapy targeting lung microvascular endothelium in pulmonary vascular disorders.

关键词： Poly(β-amino)esters nanoparticle Lung microvascular endothelium Gene delivery Specific targeting

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Porous and Ultra-Flexible Crosslinked MXene/Polyimide Composites for Multifunctional Electromagnetic Interference Shielding

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Nano-Micro Letters 2022年第4期14卷 59-74页

作者： Zhi-Hui Zeng Na Wu Jing-Jiang Wei Yun-Fei Yang Ting-Ting Wu Bin Li Stefanie Beatrice Hauser Wei-Dong Yang Jiu-Rong Liu Shan-Yu Zhao Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education and School of Materials Science and EngineeringShandong UniversityJinan 250061People’s Republic of China Department of Chemistry and Applied Biosciences ETH ZurichCH-8093 ZurichSwitzerland Laboratory for Cellulose and Wood Materials Swiss Federal Laboratories for Materials Science and Technology(Empa)8600 DübendorfSwitzerland Laboratory for Building Energy Materials and Components Swiss Federal Laboratories for Materials Science and Technology(Empa)8600 DübendorfSwitzerland School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092People’s Republic of China

Lightweight,ultra-flexible,and robust crosslinked transition metal carbide(Ti3C2 MXene)coated polyimide(PI)(C-MXene@PI)porous composites are manufactured via a scalable dip-coating followed by chemical crosslinking *** addition to the hydrophobicity,anti-oxidation and extreme-temperature stability,efficient utilization of the intrinsic conductivity of MXene,the interfacial polarization between MXene and PI,and the micrometer-sized pores of the composite foams are ***,the composites show a satisfactory X-band electromagnetic interference(EMI)shielding effectiveness of 22.5 to 62.5 dB at a density of 28.7 to 48.7 mg cm−3,leading to an excellent surface-specific SE of 21,317 dB cm^(2)g^(−1).Moreover,the composite foams exhibit excellent electrothermal performance as flexible heaters in terms of a prominent,rapid reproducible,and stable electrothermal effect at low voltages and superior heat performance and more uniform heat distribution compared with the commercial heaters composed of alloy ***,the composite foams are well attached on a human body to check their electromechanical sensing performance,demonstrating the sensitive and reliable detection of human motions as wearable *** excellent EMI shielding performance and multifunctionalities,along with the facile and easy-to-scalable manufacturing techniques,imply promising perspectives of the porous C-MXene@PI composites in next-generation flexible electronics,aerospace,and smart devices.

关键词： MXene Polyimide Electromagnetic interference shielding Heater Sensor

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Deformation and annealing of brass

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materials Today: Proceedings 2022年 64卷 1380-1383页

作者： Gaurav Chakraborty, Purnashis Prasad Vejendla, S.B. Department of Mechanical Engineering KIET Group of Institutions Ghaziabad 201206 India Department of Applied Mechanics IIT Delhi New Delhi 110016 India Department of Materials Science and Engineering IIT Delhi New Delhi 110016 India

In the present investigation, the deformation behaviour and annealing of brass have been studied. The brass samples were rolled at ambient temperature and subsequently annealed at 420 °C, 520 °C and 620 °C for 30 min. This work aims to study the hardness variation with different percentage reductions in the thickness of the brass. The hardness variation has been correlated with the microstructure evolution of the annealed brass specimen. The work findings demonstrate that the cold rolling progresses, increases in hardness value and grain shape changes. As the annealing temperature increased, the drop in hardness was noticed. © 2022

关键词： Hardness

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Novel lead-free NaNbO_(3) -based relaxor antiferroelectric ceramics with ultrahigh energy storage density and high efficiency

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Journal of Materiomics 2022年第2期8卷 295-301页

作者： Jie Jiang Xiongjie Li Ling Li Shun Guo Ji Zhang Jing Wang Heguo Zhu Yiping Wang Shan-Tao Zhang School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied Science&Jiangsu Key Laboratory of Artificial Functional Materials&Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

The development of environmentally friendly ceramics for electrostatic energy storage has drawn growing interest due to the wide application in high power and/or pulsed power electronic ***,it is difficult to simultaneously achieve ultrahigh recoverable energy storage density(W rec>8 J/cm^(3))and high efficiency(η>80%),which restricts their application in the miniaturized,light weight and easy integrated electronic ***,the novel NaNbO_(3)-(Bi_(0.8)Sr_(0.2))(Fe_(0.9) Nb_(0.1))O_(3) relaxor antiferro-electric ceramics,which integrates the merits of antiferroelectrics and relaxors,are demonstrated to exhibit stabilized antiferroelectric phase and enhanced dielectric relaxor *** particular impor-tance is that the 0.88NN-0.12BSFN ceramic achieves giant electric breakdown strength E_(b)=98.3 kV/mm,ultrahigh W _(rec)=16.5 J/cm^(3) and high h=83.3%,as well as excellent frequency,cycling and thermal reliability *** comprehensive energy storage performance of NN-BSFN not only out-performs state-of-the-art dielectric ceramics by comparison,but also displays outstanding potential for next-generation energy storage capacitors.

关键词： Lead-free NaNbO_(3) Relaxor antiferroelectric Energy storage property

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Deformation and failure behavior of heterogeneous Mg/SiC nanocomposite under compression

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Journal of Magnesium and Alloys 2022年第12期10卷 3433-3446页

作者： Xi Luo Jinling Liu Leigang Zhang Xu He Ke Zhao Linan An State Key Laboratory of Traction Power&School of Mechanics and Engineering Southwest Jiaotong UniversityChengduSichuan610031China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province Southwest Jiaotong UniversityChengduSichuan610031China Department of Materials Science and Engineering University of Central FloridaOrlandoFL32816United States

The heterogeneous magnesium(Mg) matrix nanocomposite with dispersed soft phase exhibits high strength and toughness. Herein, the deformation behavior and failure process were investigated to reveal the unique mechanical behavior of the heterogeneous microstructure under compression. The extensive plastic deformation is accompanied by the flattening and tilting of the soft phase, inhibiting strain localization and leading to strain hardening. Moreover, a stable crack multiplication process is activated, which endows high damage tolerance to the heterogeneous Mg matrix nanocomposites. The final failure of the composite is caused by crack coalescence in the shear plane along a tortuous path. The presence of dispersed soft phases within the hard matrix induces a noticeable change in mechanical response. Especially,the malleability of the heterogeneous Mg matrix nanocomposite is two and ten times higher than that of pure Mg and the homogeneous Mg matrix nanocomposite, respectively. The current study provides a novel strategy to break the trade-off between strength and toughness in metal matrix nanocomposites.

关键词： Magnesium matrix nanocomposites Heterogeneous structure Malleability Microstructural evolution

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