Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 16, Issue 18, Pages 1741-1745Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b600733c
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The present work demonstrates a simple two-phase thermal method to prepare oriented boehmite [AlO(OH)] membranes directly from anodic alumina oxide (AAO) substrate with a copper catalyst. The acidity of the aqueous phase and reaction time play important roles in the formation of the oriented AlO(OH) membranes. Closely packed AlO(OH) crystals are parallel-aligned and vertically oriented on the substrates. The wetting properties of as-prepared oriented AlO(OH) membranes were first investigated by measuring the contact angles of water and oil on the surfaces. The oriented AlO(OH) membranes (without any modification by low-surface energy polymer) show both super-hydrophobicity, with a water CA as high as 152.8 degrees, and super-oleophilicity with a heptane CA reaching to 0 degrees within 0.25 s.
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