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首页> 外文期刊>Applied Surface Science >Fabrication and icing property of superhydrophilic and superhydrophobic aluminum surfaces derived from anodizing aluminum foil in a sodium chloride aqueous solution
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Fabrication and icing property of superhydrophilic and superhydrophobic aluminum surfaces derived from anodizing aluminum foil in a sodium chloride aqueous solution

机译：在氯化钠水溶液中对铝箔进行阳极氧化得到的超亲水和超疏水铝表面的制备和覆冰性能

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摘要

An aluminum foil with a rough surface was first prepared by anodic treatment in a neutral aqueous solution with the help of pitting corrosion of chlorides. First, the hydrophobic Al surface (contact angle around 79°) became superhydrophilic (contact angle smaller than 5°) after the anodizing process. Secondly, the superhydrophilic Al surface became superhydrophobic (contact angle larger than 150°) after being modified by oleic acid. Finally, the icing property of superhydrophilic, untreated, and superhydrophobic Al foils were investigated in a refrigerated cabinet at -12 ℃. The mean total times to freeze a water droplet (6μL) on the three foils were 17 s, 158 s and 1604 s, respectively. Thus, the superhydrophilic surface accelerates the icing process, while the superhydrophobic surface delays the process. The main reason for this transition might mainly result from the difference of the contact area of the water droplet with Al substrate: the increase in contact area with Al substrate will accelerate the heat conduct process, as well as the icing process; the decrease in contact area with Al substrate will delay the heat conduct process, as well as the icing process. Compared to the untreated Al foil, the contact area of the water droplet with the Al substrate was higher on superhydrophilic surface and smaller on the superhydrophobic surface, which led to the difference of the heat transfer time as well as the icing time.
机译：首先在氯化物的点蚀的帮助下，通过在中性水溶液中进行阳极处理，制备出具有粗糙表面的铝箔。首先，在阳极氧化处理之后，疏水性Al表面（接触角约为79°）变得超亲水（接触角小于5°）。其次，超亲水Al表面在被油酸改性后变成超疏水性（接触角大于150°）。最后，在-12℃的冷藏柜中研究了超亲水，未处理和超疏水的铝箔的结冰性能。在三个箔片上冻结水滴（6μL）的平均总时间分别为17 s，158 s和1604 s。因此，超亲水表面加速了结冰过程，而超疏水表面则延迟了结冰过程。这种转变的主要原因可能是由于水滴与Al基体接触面积的不同所致：与Al基体接触面积的增加将加速导热过程以及结冰过程。与铝基板的接触面积的减少将延迟导热过程以及结冰过程。与未处理的铝箔相比，水滴与铝基材的接触面积在超亲水表面上较高，而在超疏水表面上较小，这导致了传热时间和结冰时间的差异。

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