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Tribological properties of hydroxyapatite-coated nanorods on Ti-6Al-4V surfaces

Scientific Reports 2025年第1期15卷 1-24页

作者： Osafo, Sarah Akua Asumadu, Tabiri Klenam, Desmond Etinosa, Precious Obayemi, John David Agyei-Tuffour, Benjamin Yaya, Abu Dodoo-Arhin, David Eluu, Stanley Chijioke Soboyejo, Wole Department of Materials Science and Engineering School of Engineering Sciences College of Basic and Applied Sciences University of Ghana Accra Legon Ghana Department of Biomaterial Sciences Dental School University of Ghana Korle Bu Campus Accra Ghana Department of Mechanical Engineering Program in Materials Science and Engineering Worcester Polytechnic Institute 100 Institute Road Worcester 01609 MA United States Department of Materials Engineering Sunyani Technical University Sunyani Ghana Global Center of Advanced Materials and Manufacturing Department of Mechanical Engineering College of Engineering State University of New York (SUNY) Polytechnic Institute 100 Seymour Street Utica 13502 NY United States Next Frontiers in Advanced Material Laboratory School of Chemical and Metallurgical Engineering University of the Witwatersrand 1 Jan Smuts Avenue Johannesburg 2050 South Africa Department of Biomedical Engineering Worcester Polytechnic Institute Gateway Park Life Sciences and Bioengineering Centre 60 Prescott Street Worcester 01609 MA United States Department of Biotechnology Ebonyi State University Abakaliki Nigeria Department of Pharmaceutical Microbiology and Biotechnology Faculty of Pharmaceutical Sciences Nnamdi Azikiwe University Anambra State Awka Nigeria

This paper presents the tribological properties and bioactivity of nanostructured hydroxyapatite (HA) from biowaste sources and coated onto Ti-6Al-4V substrates using a novel pack cementation method. The process introduced HA pillars/nanorods on the surfaces of Ti-6Al-4V to enhance their osseointegration for dental implants. The mechanical and tribological properties were studied with nanoindentation, and pin-on-disk techniques, following the microstructural characterization of the coatings with atomic force microscopy, X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and energy dispersive x-ray spectroscopy. The study also examines the surface bioactivity and elucidates the underlying friction and wear mechanisms of the HA-coated and annealed Ti-6Al-4V surface. The study results show a bone bonding capacity of the biowaste-derived HA-coated substrate with improved hardness and tribological properties. The implications of the study are discussed for the development of nano-structured HA-coated Ti-6Al-4V for dental implants with improved osseointegration for dental and biomedical applications. © The Author(s) 2025.

关键词： Bioactivity Dental implants Osseointegration Surface modification Titanium alloys Wear resistance

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Corrigendum to “2D Nanosilicate for additive manufacturing: Rheological modifier, sacrificial ink and support bath Bioprinting” [Bioprinting 25 (2022) e00187]

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Bioprinting 2025年 49卷

作者： Satyam Rajput Kaivalya A. Deo Tanmay Mathur Giriraj Lokhande Kanwar Abhay Singh Yuxiang Sun Daniel L. Alge Abhishek Jain Tapasree Roy Sarkar Akhilesh K. Gaharwar Department of Biomedical Engineering College of Engineering Texas A&M University College Station TX 77843 USA Nutrition College of Agriculture and Life Sciences Texas A&M University College Station TX 77843 USA Department of Material Science and Engineering College of Engineering Texas A&M University College Station TX 77843 USA Department of Medical Physiology College of Medicine Texas A&M Health Science Center Bryan TX 77807 USA Department of Cardiovascular Sciences Houston Methodist Institute for Academic Medicine Houston Methodist Research Institute Houston TX 77030 USA Department of Biology Texas A&M University College Station TX 77843 USA Interdisciplinary Program in Genetics Texas A&M University College Station TX 77843 USA Center for Remote Health Technologies and Systems Texas A&M University College Station TX 77843 USA

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Quantitative contributions of solution atoms, precipitates and deformation to microstructures and properties of Al-Sc-Zr alloys

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Transactions of Nonferrous Metals Society of China 2019年第5期29卷 907-918页

作者： Ren-guo GUAN Hong-mei JIN Wensen JIANG Xiang WANG Yu-xiang WANG Zheng LI Jian ZHANG Huinan LIU Center of Advanced Lubrication and Seal Materials State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China School of Material Science and Engineering Northeastern UniversityShenyang 110819China Materials Science and Engineering Program University of California at Riverside900 University AvenueRiversideCalifornia 92521USA Department of Bioengineering University of California at Riverside900 University AvenueRiversideCalifornia 92521USA

In order to investigate the effects of solid solution atoms, precipitated particles and cold deformation on the microstructures and properties of Al-Sc-Zr alloys, the Al-Sc-Zr alloys prepared by continuous rheo-extrusion were treated by thermomechanical treatment, analyzed for conductivity and mechanical properties by tensile and microhardness testing, and characterized using optical microscope, TEM and STEM. A mathematical model was established to quantitatively characterize the contribution of solid solution atoms, precipitates and cold deformation to the conductivity of the alloy. The results show that the strength of Al alloy can be significantly improved by solid solution, aging and cold deformation, and the quantitative impacts of solution atoms, precipitates and cold deformation on the conductivity of Al alloy are 10.5%(IACS), 2.3%(IACS) and 0.5%(IACS), respectively. Aging and cold deformation treatments are the keys to obtain high-strength and high-conductivity aluminum alloy wires.

关键词： Al.Sc.Zr alloy thermal treatment cold deformation mechanical properties conductivity

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Overcoming the surface paradox: Buried perovskite quantum dots in wide-bandgap perovskite thin films

arXiv

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arXiv 2025年

作者： Zhang, Hao Pasha, Altaf Metcalf, Isaac Zhou, Jianlin Staunstrup, Mathias Zhu, Yunxuan Liao, Shusen Ssennyimba, Ken Chen, Jia-Shiang Reddy, Surya Prakash Thébaud, Simon Hou, Jin Shuai, Xinting Mandani, Faiz Sidhik, Siraj Jones, Matthew R. Ma, Xuedan Balakrishna, R. Geetha Susarla, Sandhya Ginger, David S. Katan, Claudine Kanatzidis, Mercouri G. Bawendi, Moungi G. Natelson, Douglas Tamarat, Philippe Lounis, Brahim Even, Jacky Mohite, Aditya D. Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Applied Physics Program Smalley‐Curl Institute Rice University HoustonTX77005 United States Centre for Nano and Material Sciences Jain University Jain Global Campus Kanakapura Karnataka Bangalore562112 India Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Université de Bordeaux LP2N Talence France Institut d’Optique CNRS LP2N Talence France Department of Physics and Astronomy Rice University HoustonTX77005 United States Center for Nanoscale Materials Argonne National Laboratory LemontIL60439 United States School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85281 United States UMR 6082 CNRS INSA de Rennes Rennes35708 France Department of Chemistry Rice University HoustonTX77005 United States Department of Chemistry University of Washington Box 351700 SeattleWA98195-1700 United States UMR 6226 Rennes35000 France Department of Chemistry Northwestern University EvanstonIL United States Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States

Colloidal perovskite quantum dots (PQDs) are an exciting platform for on-demand quantum, and classical optoelectronic and photonic devices. However, their potential success is limited by the extreme sensitivity and low stability arising from their weak intrinsic lattice bond energy and complex surface chemistry. Here we report a novel platform of buried perovskite quantum dots (b-PQDs) in a three-dimensional perovskite thin-film, fabricated using one-step, flash annealing, which overcomes surface related instabilities in colloidal perovskite dots. The b-PQDs demonstrate ultrabright and stable single-dot emission, with resolution-limited linewidths below 130 μeV, photon-antibunching (g2(0)=0.1), no blinking, suppressed spectral diffusion, and high photon count rates of 104/s, consistent with unity quantum yield. The ultrasharp linewidth resolves exciton fine-structures (dark and triplet excitons) and their dynamics under a magnetic field. Additionally, b-PQDs can be electrically driven to emit single photons with 1 meV linewidth and photon-antibunching (g2(0)=0.4). These results pave the way for on-chip, low-cost single-photon sources for next generation quantum optical communication and sensing. © 2025, CC BY.

关键词： Photons

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Ultrafast Formation of Charge Transfer Trions at Molecular-Functionalized 2D MoS2Interfaces

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Angewandte Chemie 2024年第30期136卷

作者： Yuancheng Jing Kangkai Liang Nicole S. Muir Hao Zhou Zhehao Li Joseph M. Palasz Jonathan Sorbie Chenglai Wang Scott K Cushing Clifford P. Kubiak Zdeněk Sofer Shaowei Li Wei Xiong Department of Chemistry and Biochemistry University of California San Diego 9500 Gilman Drive MC 0358 La Jolla California 92093-0358 United States Material Science and Engineering Program University of California San Diego 9500 Gilman Drive MC 0418 La Jolla California 92093-0418 United States Division of Chemistry and Chemical Engineering California Institute of Technology 1200 E California Blvd MC 127–72 Pasadena California 91125 United States Department of Inorganic Chemistry University of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic

In this work, we investigate trion dynamics occurring at the heterojunction between organometallic molecules and a monolayer transition metal dichalcogenide (TMD) with transient electronic sum frequency generation (tr-ESFG) spectroscopy. By pumping at 2.4 eV with laser pulses, we have observed an ultrafast hole transfer, succeeded by the emergence of charge-transfer trions. This observation is facilitated by the cancellation of ground state bleach and stimulated emission signals due to their opposite phases, making tr-ESFG especially sensitive to the trion formation dynamics. The presence of charge-transfer trion at molecular functionalized TMD monolayers suggests the potential for engineering the local electronic structures and dynamics of specific locations on TMDs and offers a potential for transferring unique electronic attributes of TMD to the molecular layers.

关键词： charge transfer trion Time-resolved interfacial-sensitive spectroscopy sum frequency generation molecular- functionalized monolayer TMD

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Shape Permanence in Diarylethene-Functionalized Liquid-Crystal Elastomers Facilitated by Thiol-Anhydride Dynamic Chemistry

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Angewandte Chemie 2022年第11期134卷

作者： Tayler S. Hebner Maciej Podgórski Sudheendran Mavila Timothy J. White Christopher N. Bowman Department of Chemical and Biological Engineering University of Colorado Boulder 596 UCB Boulder CO 80309 USA Department of Polymer Chemistry Institute of Chemical Sciences Faculty of Chemistry Maria Curie-Sklowdowska University M. Curie-Sklodowska Sq. 5 20-031 Lublin Poland Material Science and Engineering Program University of Colorado Boulder 596 UCB Boulder CO 80309 USA

Diarylethene-functionalized liquid-crystalline elastomers (DAE-LCEs) containing thiol-anhydride bonds were prepared and shown to undergo reversible, reprogrammable photoinduced actuation. Upon exposure to UV light, a monodomain DAE-LCE generated 5.5 % strain. This photogenerated strain was demonstrated to be optically reversible over five cycles of alternating UV/Visible light exposure with minimal photochrome fatigue. The incorporation of thiol-anhydride dynamic bonds allowed for retention of actuated states. Further, re-programming of the nematic director was achieved by heating above the temperature for bond exchange to occur (70 °C) yet below the nematic-to-isotropic transition temperature (100 °C) such that order was maintained between mesogens. The observed thermal stability of each of the diarylethene isomers of over 72 h allowed for decoupling of photo-induced processes and polymer network effects, showing that both polymer relaxation and back-isomerization of the diarylethene contributed to LCE relaxation over a period of 12 hours after actuation unless bond exchange occurred.

关键词： Liquid Crystal Elastomers Covalent Adaptable Networks Shape Memory Diarylethene Robotics

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Correction to: Improvement of recycled concrete aggregate using alkali-activated binder treatment

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materials and Structures 2022年第1期55卷 1-1页

作者： Damrongwiriyanupap, Nattapong Wachum, Akaraphol Khansamrit, Kamonphop Detphan, Satakhun Hanjitsuwan, Sakonwan Phoo-ngernkham, Tanakorn Sukontasukkul, Piti Li, Long-yuan Chindaprasirt, Prinya Department of Civil Engineering School of Engineering University of Phayao Phayao Thailand Sustainable Construction Material Technology Research Unit Department of Civil Engineering Faculty of Engineering and Technology Rajamangala University of Technology Isan Nakhon Ratchasima Thailand Program of Civil Technology Faculty of Industrial Technology Lampang Rajabhat University Lampang Thailand Construction and Building Materials Research Center Department of Civil Engineering Faculty of Engineering King Mongkut’s University of Technology-North Bangkok Bangkok Thailand School of Engineering Faculty of Science and Engineering Plymouth University Plymouth United Kingdom Sustainable Infrastructure Research and Development Center Department of Civil Engineering Faculty of Engineering Khon Kaen University Khon Kaen Thailand Academy of Science The Royal Society of Thailand Dusit Bangkok Thailand

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Flash-Induced Spreading of Metals on Zirconia

SSRN

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SSRN 2019年

作者： Kiniger, Giovanni Sglavo, Vincenzo Jha, Shikhar K. Raj, Rishi Materials Science and Engineering Program Department of Mechanical Engineering University of Colorado Boulder BoulderCO80309 United States Department of Industrial Engineering University of Trento Trento38123 Italy Department of Material Science and Engineering Indian Institute of Technology UP Kanpur208016 India

Gold islands deposited on yttria stabilized zirconia disperse into very small islands when the ceramic substrate activated by current in a flash experiment. It is postulated that the gold beads spread into a nanometer thick continuous metal layer, which fragments into islands on a very fine scale when the field is switched off and the substrate returns to its original state. The flash induced wetting is explained in terms of a recent report that zirconia develops metallic character at the onset of flash, but reverts quickly to the pure ionic state when the field is turned off. © 2019, The Authors. All rights reserved.

关键词： Zirconia

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Revealing the Origin of Transition-Metal Migration in Layered Sodium-Ion Battery Cathodes: Random Na Extraction and Na-Free Layer Formation

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Angewandte Chemie 2023年第12期135卷

作者： Dr. Shiyong Chu Prof. Duho Kim Gwanghyeon Choi Chunchen Zhang Haoyu Li Prof. Wei Kong Pang Yameng Fan Anita M. D'Angelo Prof. Shaohua Guo Prof. Haoshen Zhou College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures Frontiers Science Center for Critical Earth Material Cycling Nanjing University Nanjing 210023 China Shenzhen Research Institute of Nanjing University Shenzhen 518000 China Department of Mechanical Engineering (Integrated Engineering Program) Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin-si Gyeonggi-do 17104 (Republic of Korea Institute for Superconducting & Electronic Materials University of Wollongong Wollongong NSW-2522 Australia Australian Synchrotron Australian Nuclear Science and Technology Organization 800 Blackburn Road Clayton Victoria 3168 Australia

Cation migration often occurs in layered oxide cathodes of lithium-ion batteries due to the similar ion radius of Li and transition metals (TMs). Although Na and TM show a big difference of ion radius, TMs in layered cathodes of sodium-ion batteries (SIBs) can still migrate to Na layer, leading to serious electrochemical degeneration. To elucidate the origin of TM migration in layered SIB cathodes, we choose NaCrO 2 , a typical layered cathode suffering from serious TM migration, as a model material and find that the TM migration is derived from the random desodiation and subsequent formation of Na-free layer at high charge potential. A Ru/Ti co-doping strategy is developed to address the issue, where the doped active Ru is first oxidized to create a selective desodiation and the doped inactive Ti can function as a pillar to avoid complete desodiation in Ru-contained TM layers, leading to the suppression of the Na-free layer formation and subsequent enhanced electrochemical performance.

关键词： Layered Sodium-Ion Battery Cathodes Na-Free Layer Random Na Extraction Selective Na Extraction Transition-Metal Migration

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Direct writing of PVBVA/Ti3C2 Tx (MXene) triboelectric nanogenerators for energy harvesting and sensing applications

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Nano Energy 2025年 142卷

作者： Pratap, Ajay Rajabi Kouchi, Fereshteh Burgoyne, Hailey Curtis, Michael Rektor, Attila Seol, Myeong-Lok Mansoor, Naqsh E. Varghese, Tony Valayil Eixenberger, Josh Efaw, Corey M. Zuzelski, Matt Little, Isaac Fujimoto, Kiyo Deng, Zhangxian Shuck, Christopher E. Koehne, Jessica E. Estrada, David Micron School of Material Science and Engineering Boise State University BoiseID83725 United States Biomolecular Sciences Graduate Program Boise State University BoiseID83725 United States NASA Ames Research Center Universities Space Research Association Moffett Field CA94035 United States Department of Physics Boise State University BoiseID83725 United States Center for Advanced Energy Studies Boise State University BoiseID83725 United States Department of Mechanical and Biomedical Engineering Boise State University BoiseID83725 United States Idaho National Laboratory Idaho FallsID83415 United States A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel University PhiladelphiaPA19104 United States Department of Chemistry and Chemical Biology Rutgers University PiscatawayNJ08854 United States

Triboelectric nanogenerators (TENGs) have gained recognition for their potential to convert mechanical energy into electrical energy, making them attractive for applications in healthcare, robotics, and human-device interfaces. However, many TENG devices rely on fluorinated polymers for high charge generation and involve complex fabrication processes, which limit their practicality and environmental sustainability. Here, we developed an eco-friendly composite of poly (vinyl butyral-co-vinyl alcohol-co-vinyl acetate) (PVBVA) and Ti₃C₂Tₓ MXene for extrusion printing onto aluminum foil substrates, enabling the additive manufacturing of TENGs. Experimental results indicate that integrating 5.5 mg mL-1 of MXene (P-MX 5.5) into PVBVA resulted in a power density of 760 mW·m⁻², with simultaneous improvements in open-circuit voltage (129 %) and short-circuit current (250 %), demonstrating enhanced charge transfer efficiency. Beyond aluminum foil-based devices, we further explored the fully printed P-MX 5.5 TENG by utilizing silver ink electrodes, eliminating the need for aluminum foil. This fully printed, flexible TENG was successfully used for real-time human motion sensing, demonstrating its ability to detect activities such as walking, running, knee bending, and jumping. Collectively, our additively manufactured and sustainable PVBVA-MXene TENG composites, including both aluminum-based and fully printed versions, show promise for future energy harvesters, sensors, wearable electronics, healthcare, and robotic applications. © 2025

关键词： Aluminum foil

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