阳极氧化铝生长速率的定量描述和纳米纤维的形成过程OA
Quantitative description of the growth rate of porous anodic alumina and the formation process of nanofibers
"场致助溶(Field-Assisted Dissolution,FAD)"理论无法定量描述电流-时间曲线与多孔阳极氧化铝(Porous Anodic Alumina,PAA)生长速率的关系.为了深入探讨 PAA 的形成机理,本文在相同的磷酸电解液中通过恒定电压阳极氧化方法制备了 PAA,并借助扫描电镜表征了 PAA 的微观形貌.结果表明,在 40,60 和 70 V 阳极氧化过程中,单位电荷量对应的平均生长速率分别是62,64 和72 nm/C,单位时间平均生长速率分别是149,673 和876 nm/min.由此证实,PAA 的生长速率与阳极氧化过程消耗的电荷量以及电流有关,这与传统的 FAD 理论相悖.本文基于离子电流、电子电流理论和氧气气泡模型诠释了 PAA 孔道演变成纳米纤维的形成机制,该研究提出的新思路和新见解对多孔阳极氧化物的可控制备和形成机理研究具有较好的借鉴意义.
The field-assisted dissolution(FAD)theory is widely accepted in the anodization of diverse metals,yet it fails to quantitatively clarify the correlation between current-time curves and the growth rate of porous anodic alumina(PAA).In this work,PAA was prepared via constant-voltage anodization in the identical H3 PO4 electrolyte.The average growth rates per unit charge under anodization voltages of 40 V,60 V and 70 V were 62 nm/C,64 nm/C and 72 nm/C,respectively.The average growth rates per unit time were 149 nm/min,673 nm/min and 876 nm/min,respectively.The results reveal that the growth rate of PAA is governed by the anodizing current and charge consumed in the anodizing process,which is inconsistent with the conventional FAD theory.Meanwhile,the process by which PAA channels evolve into nanofibers was explained using the theories of ionic current and electronic current as well as the oxygen bubble model.These new viewpoints offer valuable guidance for the preparation and formation mechanism of porous anodic oxides.
任叙周;李鹏泽;钱鹏;宋晔;刘霖
南京理工大学 化学与化工学院,江苏 南京 210094南京理工大学 化学与化工学院,江苏 南京 210094西安交通大学 电子材料研究室,陕西 西安 710049南京理工大学 化学与化工学院,江苏 南京 210094江苏海洋大学 环境与化工学院,江苏 连云港 222005
信息技术与安全科学
阳极氧化多孔阳极氧化铝形成机理氧气气泡模型
anodizationporous anodic aluminaformation mechanismoxygen bubble model
《电子元件与材料》 2026 (5)
501-508,8
国家自然科学基金(61171043,51777097)
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