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Polymer Binding to Carbon Nanotubes in Aqueous DispersionsStudied by NMR Diffusometry
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Industrial NMR Centre.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical 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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(English)Manuscript (preprint) (Other academic)
Abstract [en]

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.

Keyword [en]
Pluronics, F-127, carbon nanotubes, adsorption, residence time, diffusion, nuclear magnetic resonance
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-30469OAI: oai:DiVA.org:kth-30469DiVA: diva2:400324
Note
QC 20110225Available from: 2011-02-25 Created: 2011-02-25 Last updated: 2011-02-25Bibliographically approved
In thesis
1. Nano-segregated soft materials observed by NMR spectroscopy
Open this publication in new window or tab >>Nano-segregated soft materials observed by NMR spectroscopy
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is about using nuclear magnetic resonance (NMR) spectroscopy for studying soft materials. Soft materials may be encountered everyday by most readers of this thesis, for example when taking a shower or watching TV. The usefulness of these materials originates from them being soft yet, at the same time, having some kind of a structure. The characteristic length scale of those structures is often on the order of nanometers (10-9 m) and the structure can respond to various external stimuli such as temperature, electric and magnetic fields, or the presence of interfaces.

NMR spectroscopy excels when studying soft materials because it is a non-invasive technique with a large spectral resolution. Moreover, different NMR methods allow us to study local molecular dynamics or longer-range translational diffusion. Understanding those latter aspects is very important for the development of dynamic and responsive materials.

Papers I-III present our work on assessing molecular adsorption on interfaces in colloidal dispersions. Here, carbon nanotubes (CNTs) or silica particles were the colloidal substrates to which proteins, polymers or surfactants adsorbed. Papers IV-VI concern ionic mobility in liquid crystals (LCs). The influence of material structure on, for example, the anisotropy of diffusion or on the association/dissociation of ions was studied in several LC phases.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. 46 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2011:12
Keyword
nuclear magnetic resonance, soft matter, colloidal dispersion, carbon nanotubes, colloidal silica, adsorption, liquid crystals, ionic liquids, diffusion
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-30337 (URN)978-91-7415-876-2 (ISBN)
Public defence
2011-03-18, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 09:30 (English)
Opponent
Supervisors
Note
QC 20110225Available from: 2011-02-25 Created: 2011-02-23 Last updated: 2011-02-25Bibliographically approved

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