The formation mechanism of porous anodic oxides remains unclear till now.The classical field-assisted dissolution(FAD)theory cannot explain the relationship between the current curve and FAD reaction,and the influence...The formation mechanism of porous anodic oxides remains unclear till now.The classical field-assisted dissolution(FAD)theory cannot explain the relationship between the current curve and FAD reaction,and the influence of the electrode potential on anodization is rarely reported.The electrode potential theory,oxygen bubble model and the ionic current and electronic current theories were introduced to explain the growth of porous anodic oxides of three metals(Ti,Zr and Fe).Taking the anodization of Ti in aqueous solution containing 0.5wt% NH_(4)F as an example,the electrode potential was calculated,and the morphology of porous anodic oxides was investigated at low voltages.Results show that the growth of porous anodic oxides is determined by the ratio of the ionic current to the electronic current.During the anodization,metals are classified into two groups:one is easy to form the compact oxide layer,and the other is easy to induce oxygen releasing,thus forming oxygen bubbles.The electrolyte is also classified into two groups correspondingly:compact oxide layer-assisted electrolyte and releasing oxygen-assisted electrolyte.展开更多
目的研究在密闭环境下灌注3%双氧水至实验兔股骨髓腔对肺动脉压和心、肺组织的影响。方法将50只新西兰大白兔随机分为10组,每组5只,其中实验组按灌注3%双氧水的压力不同(20、80、140、200、260 mm Hg)分为5组,对照组按灌注无菌生理盐水...目的研究在密闭环境下灌注3%双氧水至实验兔股骨髓腔对肺动脉压和心、肺组织的影响。方法将50只新西兰大白兔随机分为10组,每组5只,其中实验组按灌注3%双氧水的压力不同(20、80、140、200、260 mm Hg)分为5组,对照组按灌注无菌生理盐水的压力不同(20、80、140、200、260 mm Hg)也相应分为5组。在灌注过程中持续动态监测肺动脉压的变化,灌注40 min后切开心脏,观察心脏各心房、心室内病理变化,并切取双侧肺,进行病理切片检查。结果灌注3%双氧水的实验组与灌注无菌生理盐水的对照组相比,在不同灌注压力时均出现肺动脉压的升高;实验组肺动脉压峰值随灌注3%双氧水压力的升高而升高,肺动脉压峰值出现的时间也随之前移,随后出现的平稳肺动脉压也较灌注前低。对照组不同灌注压下的变化相对平缓,无明显波动。当灌注3%双氧水压力为260 mm Hg时,可听见大量肺泡破裂声,继而实验动物由于心跳骤停而死亡。肺部病理检查发现,与对照组相比,实验组会出现不同程度的肺间质水肿及肺泡腔和肺静脉扩张。结论在密闭环境中用一定压力灌注3%双氧水可引起实验动物心、肺功能的变化,当灌注压力较高时可造成肺泡腔破裂以及心跳骤停等,继而发生实验动物死亡。结合临床相关不良反应的报道,提示双氧水在使用过程中具有潜在危险性。展开更多
基金National Natural Science Foundation of China(51577093,51777097)Natural Science Foundation of Jiangsu Higher Education Institutions(20KJB430040)+1 种基金Changzhou Science&Technology Program(CJ20200026)Qing Lan Project in Colleges and Universities of Jiangsu Province。
文摘The formation mechanism of porous anodic oxides remains unclear till now.The classical field-assisted dissolution(FAD)theory cannot explain the relationship between the current curve and FAD reaction,and the influence of the electrode potential on anodization is rarely reported.The electrode potential theory,oxygen bubble model and the ionic current and electronic current theories were introduced to explain the growth of porous anodic oxides of three metals(Ti,Zr and Fe).Taking the anodization of Ti in aqueous solution containing 0.5wt% NH_(4)F as an example,the electrode potential was calculated,and the morphology of porous anodic oxides was investigated at low voltages.Results show that the growth of porous anodic oxides is determined by the ratio of the ionic current to the electronic current.During the anodization,metals are classified into two groups:one is easy to form the compact oxide layer,and the other is easy to induce oxygen releasing,thus forming oxygen bubbles.The electrolyte is also classified into two groups correspondingly:compact oxide layer-assisted electrolyte and releasing oxygen-assisted electrolyte.
文摘目的研究在密闭环境下灌注3%双氧水至实验兔股骨髓腔对肺动脉压和心、肺组织的影响。方法将50只新西兰大白兔随机分为10组,每组5只,其中实验组按灌注3%双氧水的压力不同(20、80、140、200、260 mm Hg)分为5组,对照组按灌注无菌生理盐水的压力不同(20、80、140、200、260 mm Hg)也相应分为5组。在灌注过程中持续动态监测肺动脉压的变化,灌注40 min后切开心脏,观察心脏各心房、心室内病理变化,并切取双侧肺,进行病理切片检查。结果灌注3%双氧水的实验组与灌注无菌生理盐水的对照组相比,在不同灌注压力时均出现肺动脉压的升高;实验组肺动脉压峰值随灌注3%双氧水压力的升高而升高,肺动脉压峰值出现的时间也随之前移,随后出现的平稳肺动脉压也较灌注前低。对照组不同灌注压下的变化相对平缓,无明显波动。当灌注3%双氧水压力为260 mm Hg时,可听见大量肺泡破裂声,继而实验动物由于心跳骤停而死亡。肺部病理检查发现,与对照组相比,实验组会出现不同程度的肺间质水肿及肺泡腔和肺静脉扩张。结论在密闭环境中用一定压力灌注3%双氧水可引起实验动物心、肺功能的变化,当灌注压力较高时可造成肺泡腔破裂以及心跳骤停等,继而发生实验动物死亡。结合临床相关不良反应的报道,提示双氧水在使用过程中具有潜在危险性。
