Polymer Binding to Carbon Nanotubes in Aqueous DispersionsStudied by NMR Diffusometry
(English)Manuscript (preprint) (Other academic)
The diffusion behavior of block copolymer Pluronic F-127 in aqueous dispersions of single-walled (SW) and multi-walled (MW) carbon nanotubes (CNT) has been studied by pulsed-field-gradient (PFG) 1H NMR spectroscopy. We show that the polymers are either free monomers or bound to the CNT and exchange between these two states. The residence times and relative populations in those states could also be obtained. For both classes of CNT, the residence time in the bound state was found to be similar and in the order of 10-100 milliseconds. Thermal gravimetric analysis (TGA) showed that the SWCNT concentration dispersed by F-127 was higher than that for MWCNT.
Pluronics, F-127, carbon nanotubes, adsorption, residence time, diffusion, nuclear magnetic resonance
IdentifiersURN: urn:nbn:se:kth:diva-30469OAI: oai:DiVA.org:kth-30469DiVA: diva2:400324
QC 201102252011-02-252011-02-252011-02-25Bibliographically approved