排序方式: 共有17条查询结果,搜索用时 765 毫秒
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采用非平衡磁控溅射法在血管支架上制备Ti-O薄膜、重点研究了支架表面薄膜厚度、内外表面薄膜差异及两种变形方式下薄膜的力学性能.支架表面积用精密MES电子天平称得质量计算得到,薄膜厚度通过薄膜质量与支架表面积的关系求得;用X-射线电子能谱(EDX)分析了支架内外表面薄膜成份及含量;对支架压缩、撑开并选取变形量大、应力集中单元筋进行研究,用扫描电子显微镜(SEM)观察薄膜是否有破坏.结果表明,在该工艺下支架表面薄膜平均厚度为9.98nm,支架内外表面薄颜色泽均匀,薄膜附着性良好,在支架压缩和撑开过程中,应力大的单元筋表面没有观察到薄膜的开裂、剥落,薄膜的力学性能可靠. 相似文献
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Bacterial infection plays an important role in the initiation of biliary sludge formation. Bacterial adherence and biofilm formation on the surface of a material have been considered as one of the main factors of stent re-occlusion in clinic. This work reported preventing bacterial adherence and bacterial biofilm formation on the surface of biliary stent material using chitosan film. The chitosan film was deposited on 316 L stainless steel (SS) plate by electrophoresis method and was characterized by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). The ability of inhibiting bacterial adherence was investigated by incubating in human fresh bile adding E. coli and Enterobacter at 37±1 ℃ . Scanning electron microscopy (SEM) and fluorescence staining were used for observing bacterial colonization and biofilm formation. The results show that chitosan film was uniformly deposited on material surface, and the composition of the film did not change through cross-linking, but the crystallinity of chitosan film become well. Comparing to un-modified sample, the E. coli and Enterococcus adhesion amount and colonization on the surface of modified sample were significantly decreased by fluorescence staining and SEM. It is suggested that chitosan could be applied to biliary stent in clinical because of its antimicrobial activities. 相似文献
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改良氧化还原法制备石墨烯及其电学性能研究 总被引:1,自引:0,他引:1
为减少水合肼还原氧化石墨烯带来的污染并获得完整的石墨烯结构,采用改良Hummers法制备氧化石墨烯并通过维他命C对氧化石墨烯进行还原制备石墨烯。采用X射线衍射仪、拉曼光谱仪对制备的石墨烯结构进行表征,通过扫描电子显微镜观察石墨烯形貌,采用同步热分析仪及四探针测试法对石墨烯进行了性能表征;对比了维他命C和水合肼对石墨烯结构及性能的影响。结果表明,改良Hummers法缩短了氧化石墨烯的制备时间,且制备的氧化石墨烯电阻率较小,用维他命C还原法制备的石墨烯表面形貌更为平整,缺陷更少,性能更优,适合用作电极材料。 相似文献
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电化学抛光中电解液的失效分析 总被引:2,自引:0,他引:2
阐述了电化学抛光中磷酸、硫酸、铬酐各组分及所起的作用,以不锈钢为研究对象,通过测定单位体积通过电量后的溶液中Fe3+、Cr3+浓度变化作为失效的判断依据;分析了电解液各组分对抛光质量和抛光液寿命的影响,并作出了判断抛光液失效的指标和测量方法,得出了三者在电化学抛光中的控制范围,为控制抛光工艺过程和保证抛光质量提供了依据. 相似文献
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采用NH4HF2-HNO3光整液对钛合金(TC4)进行化学光整研究,利用台阶仪测得粗糙度值或测定样品反射率来确定表面质量,分析了化学液组成、光整温度、光整时间和添加剂选择及用量对光整质量的影响,获得了较合理的工艺参数:NH4HF2 (16%)5mL、H2O2 (40%)11mL、C6H12N4 (16%) 2mL、HNO3 (65%~80%) 11mL、添加剂1mL.光整时间为2.5min,光整温度为20℃.通过极化实验和PBS浸泡实验验证钛合金光整前后的耐蚀性能,结果表明在提高钛合金表面质量的同时也增强了其抗腐蚀性能,采用此工艺可对结构复杂的医用钛合金表面进行光整加工. 相似文献
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