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Polymer binding to carbon nanotubes in aqueous dispersions: Residence time on the nanotube surface As Obtained by NMR diffusometry
KTH, School of Chemical Science and Engineering (CHE), Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Industrial NMR Centre.
KTH, School of Chemical Science and Engineering (CHE), Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Industrial NMR Centre. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
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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
Abstract [en]

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 ± 5 ms for SWCNT and of 54 ± 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.
Keyword [en]
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
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-99816DOI: 10.1021/jp209800uISI: 000301169300001Scopus ID: 2-s2.0-84858016568OAI: oai:DiVA.org:kth-99816DiVA: diva2:542558
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note
QC 20120802Available from: 2012-08-02 Created: 2012-08-02 Last updated: 2017-12-07Bibliographically approved

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Furo, Istvan

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