Stable superhydrophobic coatings Using PVDF/MWCNT nanocomposite
IR@NAL: CSIR-National Aerospace Laboratories, Bangalore
View Archive Info| Field | Value | |
| Title |
Stable superhydrophobic coatings Using PVDF/MWCNT nanocomposite
|
|
| Creator |
Chakradhar, RPS
Prasad, G Bera, Parthasarathi Basu, Bharathibai J Anandan, C |
|
| Subject |
Aeronautics (General)
Chemistry and Materials (General) |
|
| Description |
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 PVDFMWCNT 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.
|
|
| Publisher |
Elsevier Publisher
|
|
| Date |
2014-05-15
|
|
| Type |
Journal Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://nal-ir.nal.res.in/12194/1/ja514.pdf
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 |
|
| Relation |
http://dx.doi.org/10.1016/j.apsusc.2014.02.044
http://nal-ir.nal.res.in/12194/ |
|