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taozhikai金蟲 (著名寫手)
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自然-材料:多孔陽極氧化膜機理揭示 已有8人參與
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Electrochemical oxidation of metals, in solutions where the oxide is somewhat soluble, produces anodic oxides with highly regular arrangements of pores. Although porous aluminium and titanium oxides have found extensive use in functional nanostructures, pore initiation and self-ordering are not yet understood. Here we present an analysis that examines the roles of oxide dissolution and ionic conduction in the morphological stability of anodic films. We show that patterns of pores with a minimum spacing are possible only within a narrow range of the oxide formation efficiency (the fraction of oxidized metal atoms retained in the film), which should exist when the metal ion charge exceeds two. Experimentally measured efficiencies, over diverse anodizing conditions on both aluminium and titanium, lie within the different ranges predicted for each metal. On the basis of these results, the relationship between dissolution chemistry and the conditions for pore initiation can now be understood in quantitative terms. |
材料科學最新前沿熱點 | 英文文獻或者教材 | Nano&Micro | nano physics&chem |
量子點敏化太陽能電池 | 納米材料 | 電電滴滴 |
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金蟲 (著名寫手)
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