AI Article Synopsis
- The study shows that multiwalled carbon nanotubes (MWNTs) can be easily dispersed and precipitated in water using specific non-ionic surfactants based on pyrene.
- The dispersion can be controlled by temperature, where heating leads to precipitation and cooling allows the MWNTs to re-disperse with gentle stirring.
- This reversible process also remains effective even in solutions with high salt concentrations, like NaCl.
Article Abstract
Easily reversible aqueous dispersion/precipitation of multiwalled carbon nanotubes (MWNTs) has been demonstrated using small-molecule non-ionic pyrene-based surfactants, which exhibit lower critical solution temperature (LCST) phase behaviour. The MWNTs are dispersed by means of non-covalent interactions. The dispersibility can be switched "off" (i.e., MWNTs precipitated) upon heating and switched "on" (i.e., MWNTs re-dispersed) upon cooling and merely swirling the sample at room temperature, that is, under very mild conditions. This effect is also observed under high ionic strength conditions with NaCl in the aqueous phase.
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| http://dx.doi.org/10.1002/chem.201405804 | DOI Listing |
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