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Control of Mode of Crystal Networking During Monolayer Assembly of Microcrystals on Water

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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.
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Keywords: AIR-WATER INTERFACE; CLOSE PACKING; EDGE-TO-EDGE SHARING; FACE-TO-FACE SHARING; HYDROPHOBIC SURFACE; MONOLAYER; SELF ASSEMBLY; ZEOLITE

Document Type: Research Article

Publication date: 2010-01-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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