OPTICS AND LASER TECHNOLOGY
·
2023
·
IF 5
Wennan Su,Chi Zhang,Xiufang Cui,Guo Jin,Changhao Liu,Erbao Liu,Jian Li,Haonan Zhao,Boyu Cao,Haoliang Tian
YF 3 modification NiTi-Si coatings were prepared on Ti-6Al-4 V substrate by laser cladding. On this foundation, heat and cryogenic treatments were conducted respectively to explore the effect of after-treatment procedures. The consequence of post-treatment methods on the phase constituent, microstructure, mechanical property, and phase transition characteristics of post-treatment coatings was studied. The phase constituent of the three coatings was roughly the same, composed of NiTi and NiTi 2 . The results show that heat treatment led to the coarsening of NiTi phase grain size and increased Si content in the NiTi 2 phase. In addition, due to the rapid cooling rate provided by cryogenic treatment, the spinodal decomposition of the Si element occurred in the NiTi 2 phase. Furthermore, the post-treatments also affected the phase transformation characteristics of the coatings. As the temperature of martensitic transformation is sensitive to the content of Ni element in the NiTi phase, the M s and M f points of the heat treatment coating were slightly higher. In contrast to the heat treatment, the M s and M f points of the cryogenic treatment coating decreased. The microhardness of the three coatings is as follows: cryogenic treatment > original coatings > heat treatment. The cryogenic treatment coating has the highest microhardness due to grain refinement and spinodal decomposition. In addition, the cryogenic treatment coating showed the best wear morphology.
研究领域:
材料科学
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表面工程
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金属涂层
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相变
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激光加工
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 21
·8908-8923
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IF 4.5
Zhang Zhengchu,Wen Meichen,Zhao Zijie,Yang Chao,Liu Qifan,Qiu Jianhui,Zang Limin
For wearable electronics, flexible supercapacitors with shape memory function can better meet the needs of practical applications. Herein, the porous Ni and NiCo-layered double hydroxide (NiCo-LDH) nanosheets were electrodeposited on the shape memory alloy wire (SMAW) to obtain the wire-shaped NiCo-LDH@Ni@SMAW electrodes with excellent electrochemical performance and shape memory ability. The maximum specific capacity of the electrode reaches 515.0 C g –1 at 0.2 A g –1 . The shape memory supercapacitor (SMSC) assembled by the NiCo-LDH@Ni@SMAW positive electrode and the activated carbon fiber yarn negative electrode exhibits good flexibility and excellent shape memory performance, which can return to the original shape within a few seconds and has a high capacitance retention of 81.5% after 50 shape recovery cycles. In addition, the SMSC also shows high energy density (136.6 μWh cm –2 ), power density (36 mW cm –2 ) and cycling stability (92.5% capacitance retention after 10,000 cycles). Graphical Abstract
研究领域:
材料科学
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能源存储
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 42
·19936-19945
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IF 4.682
Zhang Jing,Yao Qingyun,Tang Shuangmei,Yang Chao,Liu Qifan,Zang Limin,Qiu Jianhui
Flexible linear aqueous zinc-ion hybrid supercapacitors are considered as ideal materials for flexible and wearable electronic devices due to their advantages of safety, high flexibility and good wearable ability. Materials based on shape memory can satisfy the needs of fatigue resistance and deformation recovery, and have great advantages in the assembly of flexible wearable devices. In this paper, aqueous zinc-ion hybrid supercapacitor with shape-memory function was assembled by using PANI/NiTi shape-memory alloy wire as the cathode electrode and flexible zinc wire as the anode electrode. The device can be bent into different angles from 0° to 180°, after repeated bending for 200 times and heating to its deformation temperature, the original shape can still be restored, and the capacitance retention rate is up to 90%, with good mechanical resistance. By assembling with flexible zinc wire, the potential window can be expanded to 1.6 V, and the energy density has been greatly improved. Its energy density can reach 55.9 Wh kg −1 at 3 A g −1 , which greatly improves its energy density and has great development potential in flexible and portable electronic devices.
研究领域:
材料科学
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能源存储
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zijie Zhao,Qifan Liu,Limin Zang,Hui You,Jing Zhang,Xue Wang,Chao Yang
In recent years, wearable and flexible supercapacitors have attracted extensive attention. High energy density supercapacitors based on shape-memory materials can meet the requirements of recoverability and fatigue resistance . We fabricate a symmetric wire-based shape-memory supercapacitor (SMSC) by depositing polypyrrole (PPy) on NiTi shape-memory alloy wire as electrodes. The SMSC exhibits high flexibility and excellent shape-memory performance, which can quickly recover to its original shape in a few seconds with almost constant capacitance when heated to the deformation temperature (approximately 60 °C) at arbitrary shapes of deformation. Furthermore, the SMSC displays an ultrahigh areal energy density of 60.0 μWh cm −2 and represents excellent capacitance stability after multiple deformation/recovery processes. Considering its outstanding flexible ability and excellent electrochemical performance, the wire-based SMSC shows infinite potential in the application of flexible and wearable electronics.
研究领域:
材料科学
·
储能
·
柔性电子
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超级电容器
·
智能材料
✓ 已验证
DOI
高影响因子
Materials Today Bio
·
2022
·
IF 10.761
Xueqing Hao,Jielong Zhou,Juning Xie,Xianrui Zou,Baoe Li,Chunyong Liang,Yu Zhang,Feng Peng,Donghui Wang
Preferable antibacterial property and osteogenesis are the permanent pursuit for metallic implants. However, it is difficult to satisfy both the properties. In fact, implants may be contaminated with bacteria during storage and surgery, leading to inflammation. Therefore, the antibacterial property of biomaterial surfaces is required not only in the human environment but also at room temperature. In this study, porous structures loaded with a thermosensitive poly ( N -isopropylacrylamide) (PNIPAM) hydrogel on a nitinol (NiTi) substrate were constructed. When the temperature is 25 °C, almost all bacteria cannot adhere to the sample surface due to the abundant hydration layer of the PNIPAM hydrogel. Meanwhile, when the temperature is 37 °C, the structure of the PNIPAM hydrogel collapses and the hydration layer disappears due to the temperature change. However, the porous structures lock water in the pores, which results in a high-hydration-rate sample surface. This surface has few bacterial adhesion sites; nevertheless, the adhesion of larger cells to the surface is not impeded by the porous structure. In addition, the PNIPAM hydrogel is soft and biocompatible, so the sample can have better cell adhesion and proliferation than a bare NiTi alloy. Based on these results, it can be concluded that the porous NiTi sample loaded with the thermosensitive PNIPAM hydrogel has the antibacterial property before implantation and the dual function of inhibiting bacterial adhesion and promoting cell adhesion and proliferation after implantation, which shows promising applications in the biomedical field such as orthopedic implantation.
研究领域:
生物材料
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生物医学工程
·
骨科
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）