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RISS 인기검색어
- 검색키워드
- 저자 : Huang Ce (검색결과 3 건)
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Kinetic Models of Controllable Pore Growth of Anodic Aluminum Oxide Membrane
Yan Huang,Hong-yan Zeng,Ce Zhao,Ye-qing Qu,Pin Zhang 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.3
An anodized Al2O3 (AAO) membrane with apertures about 72 nm in diameter was prepared by two-step anodic oxidation. The appearance and pore arrangement of the AAO membrane were characterized by energy dispersive x-ray spectroscopy and scanning electron microscopy. It was confirmed that the pores with high pore aspect ratio were parallel, well-ordered, and uniform. The kinetics of pores growth in the AAO membrane was derived, and the kinetic models showed that pores stopped developing when the pressure (σ) trended to equal the surface tension at the end of anodic oxidation. During pore expansion,the effects of the oxalic acid concentration and expansion time on the pore size were investigated, and the kinetic behaviors were explained with two kinetic models derived in this study. They showed that the pore size increased with extended time (r=G·t+G’), but decreased with increased concentration (r=−K·lnc -K’)through the derived mathematic formula. Also, the values of G, G’,K, and K’ were derived from our experimental data.
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Zhou Yongqin,Huang Ce,Chen Junjie,Shi Guijun,Zhou Meilan 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.6
Due to synchronous rectification based on Phase-shift full bridge converter is difficult to work in a state of soft switch, to solve this problem, this paper sets out an control approach of synchronous rectification based on the ZVZCS phase-shifted full-bridge, and the drive signal of synchronous rectification side uses leading-leg drive waveform after a certain time delay and applies the resonant principle in the switching process,not only keeping full bridge ZVZCS soft switching but also realizing MOSFET of the synchronous rectification ZVS. The simulation of saber and experimental research show that the converter has a good performance.
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Yumei Li,Rui Zhao,Xiang Li,Chuying Wang,Huiwei Bao,Shudan Wang,Jing Fang,Jinqiu Huang,Ce Wang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
The endothelialization and anti-thrombotic abilities of tissue engineered vascular scaffolds are considered to be effective properties for improving the performance small-caliber vascular scaffolds. For this purpose, we designed and developed electrically conductive fibrous scaffolds based on polyaniline coated polyurethane (PANI-PU) electrospun fibersfor vascular tissue engineering applications. The porosity of PANI-PU fibers was 75.27±2.04 %. The obtained PANI-PU fibers were characterized by SEM observations, XPS analysis, water contact angle (WCA) measurement and mechanical property. The PANI functionalization aimed to improve the performance of anticoagulation and endothelialization. The WCA of PAIN-PU decreased to 35 o from 135 o of PU fibers. Blood compatibility and cytocompatibility were compared before and after PANI coating. The adhered platelet cells on PANI-PU was 6.87×105/cm2 and plasma recalcification time was 123 s. Platelet adhesion and plasma recalcification time test showed that the PANI-PU scaffolds had a certain anticoagulant effect. The hemolysis rate of PANI-PU fibers was 0.14 %, which showed that the PANI-PU scaffolds could be used as blood contact materials. The observation of endothelial cell proliferation and morphology in human umbilical vein endothelial cells showed that PANI-PU fibers were more beneficial to cell adhesion, proliferation and extension than that of PU fibers. The results demonstrates the PANI coated electrospun PU fibers have great potential in application as small-diameter vascular grafts and this work shows new insights into conductive scaffolds for vascular tissue engineering.
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