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Adsorption isotherms of cationic surfactants on silica particles measured by NMR spectroscopy
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), Chemistry, Physical Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Industrial NMR Centre.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

We present here a new method that employs NMR spectroscopy to quantify the adsorbed amount of surfactant on the surface of particles and thereby provide the adsorption isotherm. As demonstration, the adsorption isotherms for a series of cationic surfactants on silica particles are obtained. Those results are in general agreement with previous observations and the overall appearances of adsorption isotherms exemplify the interplay between electrostatic and hydrophobic interactions. Compared to other available methods, the experimental error is comparable or smaller in a very wide range of surfactant concentrations and there exist other potential advantages.

Identifiers
URN: urn:nbn:se:kth:diva-30471OAI: oai:DiVA.org:kth-30471DiVA: diva2:400352
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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Furó, István

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