Characterisation of microstructure and evaluation of optical and EPR properties of superhydrophobic copper dodecanoate films |
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Authors: | R. P. S. Chakradhar V. Dinesh Kumar C. Shivakumara J. L. Rao Bharathibai J. Basu |
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Affiliation: | 1. Surface Engineering Division, National Aerospace Laboratories (CSIR), , Bangalore, 560017 India;2. Solid State and Structural Chemistry Unit, Indian Institute of Science, , Bangalore, 560 012 India;3. Department of Physics, S.V. University, , Tirupathi, 517 502 India |
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Abstract: | Copper dodecanoate films prepared by emulsion method exhibit superhydrophobic property with water contact angle of 155° and sliding angle of <2°. The films have been characterised by using X‐ray diffraction, field emission scanning electron microscopy and Fourier transform infrared spectroscopy techniques. Surface microstructure of copper dodecanoate consists of numerous microscale papillas of about 6–12 µm in length with a diameter in the range of 360–700 nm. The superhydrophobicity of the films is due to their dual micronano surface morphology. The wetting behaviour of the film surface was studied by a simple water immersion test. The results show that copper dodecanoate film retained superhydrophobic property even after immersing in water for about 140 h. The optical absorption spectrum exhibits two broadbands centred at 388 and 630 nm that have been assigned to 2B1g → 2Eg and 2B1g → 2B2g transitions of Cu2+ ions, respectively. The electron paramagnetic resonance spectrum exhibits two resonance signals with effective g values at g|| ≈ 2.308 and g⊥ ≈ 2.071, which suggests that the unpaired electron occupies dx2–y2 orbital in the ground state. Copyright © 2011 John Wiley & Sons, Ltd. |
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Keywords: | superhydrophobic copper dodecanoate water contact angle XRD FESEM FTIR EPR optical absorption |
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