Polymer binding to carbon nanotubes in aqueous dispersions: Residence time on the nanotube surface As Obtained by NMR diffusometry
2012 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 116, no 9, 2635-2642 p.Article in journal (Refereed) Published
The binding of block copolymer Pluronic F-127 in aqueous dispersions of single- (SWCNT) and multiwalled (MWCNT) carbon nanotubes has been studied by pulsed-field-gradient (PFG) 1H NMR spectroscopy. We show that a major fraction of polymers exist as a free species while a minor fraction is bound to the carbon nanotubes (CNT). The polymers exchange between these two states with residence times on the nanotube surface of 24 Â± 5 ms for SWCNT and of 54 Â± 11 ms for MWCNT. The CNT concentration in the solution was determined by improved thermal gravimetric analysis (TGA) indicating that the concentration of SWCNT dispersed by F-127 was significantly higher than that for MWCNT. For SWCNT, the area per adsorbed Pluronic F-127 molecule is estimated to be about 40 nm 2.
Place, publisher, year, edition, pages
2012. Vol. 116, no 9, 2635-2642 p.
Aqueous dispersions, H NMR spectroscopy, Multi-walled, Nanotube surface, NMR diffusometry, Pluronic F-127, Polymer binding, Pulsed field gradients, Residence time, Thermal gravimetric analysis, Two-state, Block copolymers, Dispersions, Multiwalled carbon nanotubes (MWCN), Thermogravimetric analysis, Polymers
IdentifiersURN: urn:nbn:se:kth:diva-99816DOI: 10.1021/jp209800uISI: 000301169300001ScopusID: 2-s2.0-84858016568OAI: oai:DiVA.org:kth-99816DiVA: diva2:542558
FunderSwedish Research CouncilKnut and Alice Wallenberg Foundation
QC 201208022012-08-022012-08-022012-08-02Bibliographically approved