Issue 3, 2013

Reversible switching between hydrophobicity and oleophobicity of polyelectrolyte-functionalized multiwalled carbon nanotubesvia counterion exchange

Abstract

Poly[2-(methacryloyloxy)ethyltrimethylammonium chloride] (PMETAC) brushes were grafted onto the surface of multiwalled carbon nanotubes (MWCNTs) by surface-initiated atom transfer radical polymerization (ATRP). The coating of the PMETAC modified MWCNTs (MWCNT-PMETAC) was prepared on the copper substrate by a spraying method. The wettability transition of the MWCNT-PMETAC surface between superhydrophobicity and hydrophilicity can be easily achieved via counterion exchange. In addition, the MWCNT-PMETAC surface showed an oil contact angle about 138.6 ± 1.4° with a 5 μL hexadecane droplet and exhibited superoleophilicity after proper anions exchange, and this switch was also reversible. The counterion exchange of the MWCNT-PMETAC surface was confirmed by X-ray photoelectron spectroscopy (XPS) and contact angle (CA) measurement.

Graphical abstract: Reversible switching between hydrophobicity and oleophobicity of polyelectrolyte-functionalized multiwalled carbon nanotubes via counterion exchange

Supplementary files

Article information

Article type
Paper
Submitted
25 Oct 2012
Accepted
02 Jan 2013
First published
18 Jan 2013

New J. Chem., 2013,37, 810-814

Reversible switching between hydrophobicity and oleophobicity of polyelectrolyte-functionalized multiwalled carbon nanotubes via counterion exchange

C. Jiang, Q. Wang and T. Wang, New J. Chem., 2013, 37, 810 DOI: 10.1039/C2NJ40970D

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