Control of Mode of Crystal Networking During Monolayer Assembly of Microcrystals on Water
Abstract:A series of hydrocarbon (HC)-coated cubic zeolite microcrystals (1.7 μm) was prepared. The HCs were n-octyl, n-dodecyl, methyl n-undecanoate, n-octadecyl, and n-heptadecafluorodecyl. The measured water contact angles () of the corresponding HC-coated glass plates were 64, 77, 82, 102, and 105°, respectively, indicating that the hydrophobicity of the surface-tethered hydrophobic chain (HC) increased in the above order. The HC-coated zeolite microcrystals readily formed closely packed monolayers at the air–water interface through interdigitation of surface-tethered HCs, and on glass plates after transferring onto glass plates by dip coating. Interestingly, while the mode of networking was face-to-face (FTF) contacting with n-octyl or n-dodecyl ( ≤ 77°) as HC, it changed to edge-to-edge (ETE) contacting mode with n-octadecyl or n-heptadecafluorodecyl ( ≥ 102°) as HC. With methyl n-undecanoate ( = 82°) as HC, both modes appeared in the monolayers, with about equal populations. The resulting monolayers of cubic zeolite microcrystals with their three-fold axes oriented perpendicular to substrates would be useful for application of the zeolite monolayers for advanced materials.
Document Type: Research Article
Publication date: January 1, 2010
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