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Characterisation of microstructure and evaluation of optical and EPR properties of superhydrophobic copper dodecanoate films
Author(s) -
Chakradhar R. P. S.,
Dinesh Kumar V.,
Shivakumara C.,
Rao J. L.,
Basu Bharathibai J.
Publication year - 2012
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.3818
Subject(s) - microstructure , copper , contact angle , electron paramagnetic resonance , wetting , scanning electron microscope , materials science , fourier transform infrared spectroscopy , analytical chemistry (journal) , crystallography , chemistry , nuclear magnetic resonance , optics , composite material , metallurgy , organic chemistry , physics
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 2 B 1 g → 2 E g and 2 B 1 g → 2 B 2 g transitions of Cu 2+ 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 d x2– y 2 orbital in the ground state. Copyright © 2011 John Wiley & Sons, Ltd.