MATERIALS & DESIGN
·
2020
·
IF 6.289
Yiqun Zhang,Yaqiang Dong,Bang Zhou,Qiang Chi,Liang Chang,Mengji Gong,Jianjun Huang,Yan Pan,Aina He,Jiawei Li,Xinmin Wang
In this work, dense and pinhole-free poly-para-xylylene (PPX) with high thermal stability, high insulating property and high lubricity has been designed as coating layer for Fe-based amorphous powder. Three ultra-thin PPX layers have been successfully deposited on the surface of FeSiBPNbCr amorphous powder via chemical vapor deposition (CVD) polymerization. The micromorphology and chemical structure of the PPX layer on the powder surface, as well as the conversion mechanisms, has been investigated systematically. Several methods have been used to estimate the amount and thickness of PPX layers. The corresponding amorphous powder cores (AMPCs) were also prepared. With the increasing thickness of the PPX layer, the saturation magnetization ( M s ) of the powder decreased slightly but the magnetic flux density ( B s ) of the AMPCs kept at a similar level thanked to the enhanced green density. In addition, the DC bias performance was improved and core loss ( P cv ) was reduced. Compare with other coating materials like epoxy and silicon resin, the PPX layer provided better insulation and higher lubricity for the AMPCs, thus reduced the P cv and improved the DC bias performance. The AMPCs coated by PPX-3 exhibited excellent comprehensive soft magnetic properties, which were promising for high-power and high-frequency applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
FUSION ENGINEERING AND DESIGN
·
2016
·
IF 1.301
Jiaqiu Luo,Jialing Yin,Hao Zhang,Mengqi Yao,Wencheng Hu
This work aimed to fabricate a gold coating on the surface of ultralow-density carbon-hydrogen foam cylinder without electroless plating. Poly (divinylbenzene/styrene) foam cylinder was synthetized by high internal phase emulsion, and chemical vapor deposition polymerization approach was used to form a compact poly- p -xylylene film on the foam cylinder. Conducting gold thin films were directly deposited onto the poly- p -xylylene-modified foam cylinder by magnetron sputtering, and electrochemical deposition was adopted to thicken the gold coatings. The micro-structures and morphologies of poly (divinylbenzene/styrene) foam cylinder and gold coating were observed by field-emission scanning electron microscopy. The gold coating content was investigated by energy-dispersive X-ray. The thicknesses of poly- p -xylylene coating and sputtered gold thin-film were approximately 500 and 100 nm, respectively. After electrochemical deposition, the thickness of gold coating increased to 522 nm, and the gold coating achieved a compact and uniform structure.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xiaoqing Lv,Zhengtai Ma,Jiaqi Xu,Zhen Wang,Guixian Zhu,Beiju Huang
The paper-based analytical platforms have been applied in biochemical detection and environmental monitoring due to their low cost and easy operation. Despite their advantages, the complexity of fabrication has limited their further application. Here, a simple and innovative approach using parylene C, a material commonly used in semiconductors, is reported to fabricate paper-based chips and construct a point-of-care testing (POCT) platform through smartphones. Parylene C is deposited on the filter paper through a polydimethylsiloxane (PDMS) clamp and forms a hydrophobic barrier. A three-channel paper-based chip was utilized to detect aluminum (Al) ions on a smartphone platform by the chromogenic method. The color change after Al 3+ detection is represented with △E which was photographed and calculated by app on smartphone. The detection limit is 0.05 mg/L and the detection range is from 0.05 mg/L to 10 mg/L which indicates the application potential in the field of biochemical detection. This new paper-based sensing method and smartphone-based portable detection platform are simple, low-cost, fast, and highly sensitive, and provides a potential application for on-site, visual detection of ions and even other substances.
研究领域:
分析化学
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环境科学
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即时检测
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智能手机应用
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 36
·
IF 12.5
Zeping He,Boning Sun,Hui Lu,Xidi Sun,Zhangsheng Xu,Yegang Liang,Qiuchun Lu,Yang Yu,Kaiyu Hu,Swapnadeep Poddar,Wenqiang Wu,Wenchao Gao,Xun Han,Zhiyong Fan,Caofeng Pan
The human visual system’s real-time focus-tunable imaging capability has inspired curved imaging system development. However, curved image sensors mimicking the human retina typically lack tunable curvature to match the curved Petzval surface throughout the focus-tunable range. Here, we propose a focus-tunable real-time curved imaging system based on a tunable-curvature perovskite curved image sensor. Using parylene C film for waterproofing and encapsulation, the ultrathin perovskite curved image sensor with the hierarchical mesh design is demonstrated, which conforms to spherical surfaces of different radii while maintaining mechanical stability during deformation. The image sensor exhibits low detection limit (10 nanowatts per square centimeter) and long-term stable dynamic photoresponse. Combining the image sensor with a tunable lens achieves clear images at different distances via simultaneously adjusting both sensor and lens radii. Furthermore, through integrating image sensor with a readout matrix and wireless data collection component, the real-time imaging system is demonstrated with real-time focus-tunable imaging capabilities.
研究领域:
光学成像
·
传感器技术
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材料科学
·
柔性电子学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Bioactive Materials
·
2023
·
IF 18.9
Ming Li,Yuan Gao,Miaowen Jiang,Hongkang Zhang,Yang Zhang,Yan Wu,Wenhao Zhou,Di Wu,Chuanjie Wu,Longfei Wu,Luzi Bao,Xiaoxiao Ge,Zhengfei Qi,Ming Wei,Ang Li,Yuchuan Ding,Jicheng Zhang,Guangzhen Pan,Yu Wu,Yan Cheng,Yufeng Zheng,Xunming Ji
Selective endovascular hypothermia has been used to provide cooling-induced cerebral neuroprotection, but current catheters do not support thermally-insulated transfer of cold infusate, which results in an increased exit temperature, causes hemodilution, and limits its cooling efficiency. Herein, air-sprayed fibroin/silica-based coatings combined with chemical vapor deposited parylene-C capping film was prepared on catheter. This coating features in dual-sized-hollow-microparticle incorporated structures with low thermal conductivity. The infusate exit temperature is tunable by adjusting the coating thickness and infusion rate. No peeling or cracking was observed on the coatings under bending and rotational scenarios in the vascular models. Its efficiency was verified in a swine model, and the outlet temperature of coated catheter (75 μm thickness) was 1.8–2.0 °C lower than that of the uncoated one. This pioneering work on catheter thermal insulation coatings may facilitate the clinical translation of selective endovascular hypothermia for neuroprotection in patients with acute ischemic stroke.
研究领域:
生物医学工程
·
神经科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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