Stable superhydrophobic coatings Using PVDF/MWCNT nanocomposite

Chakradhar, RPS and Prasad, G and Bera, Parthasarathi and Basu, Bharathibai J and Anandan, C (2014) Stable superhydrophobic coatings Using PVDF/MWCNT nanocomposite. Applied Surface Science, 301. pp. 208-215. ISSN 0042-207X

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Thermally stable superhydrophobic coatings have been prepared using Polyvinylidene fluoride (PVDF)Multiwalled carbon nanotubes (MWCNTs) by spray coating method. The effects of MWCNT (0 – 66 wt%) and temperature (300 to 623 K) on wettability have been studied. A transformation from hydrophobic to superhydrophoic state was achieved with increase of CNT content. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) studies reveal that with increase in CNT content, -phase of PVDF decreases suggesting that MWCNT has strong effect on the phase separation of PVDF. Field emission scanning electron microscopy (FESEM) studies show that the coatings have rough surface with porous structure. With increase in CNT content the protrusion like structures decreased reaching micro/nano scales. The coatings were thermally stable upto 573 K exhibiting superhydrophobicity and thereafter transformed to superhydrophilic state at 623 K. Energy dispersive X-ray spectroscopy (EDXS) analysis show the absence of fluorine after annealing at 623 K suggesting decomposition of PVDF. X-ray photoelectron spectroscopy (XPS) of C1s and F1s core levels in as-deposited PVDFMWCNT coating show the presence of CF2 related species. Concentration of fluorine drastically decreases after heat treatment of the coating at 350 C. The main advantage of the present method is feasibility for application over large area and the coatings are stable upto 573 K.

Item Type: Article
Additional Information: Copyright to this article belongs to M/s. Elsevier Publisher
Uncontrolled Keywords: Polyvinylidene fluoride;Multiwalled carbon nanotubes; superhydrophobic;Superhydrophilic;X-ray diffraction;WCA; FESEM;DTA/TG;FTIR;XPS
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 25 Jun 2015 10:49
Last Modified: 28 Oct 2015 07:18

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