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Charged colloids observed by electrophoretic and diffusion NMR
KTH, School of Chemical Science and Engineering (CHE), Chemistry.
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The thesis deals partly with methodology including construction

of hardware and new pulse sequences in the field of electrophoretic

NMR, and partly with practical use of ENMR and

diffusion NMR in the investigation of charged colloidal systems.

Several sources of artefacts are investigated, including gas production

at the electrodes, electroosmosis and Joule heating

effects that can cause convection. The electrophoretic double

stimulated-echo pulse sequence is introduced to suppress these

artefacts and to increase the feasible measuring range to higher

electric fields and conductivities.

The interaction between the non-ionic polymer poly(ethylene

oxide) PEO and differently charged surfactants is investigated

using the above mentioned methods. The investigated surfactants

are the anionic sodium dodecyl sulphate (SDS) and

potassium laurate (KC12), the cationic dodecyltrimethylammonium

bromide (CTAB) and the non-ionic octyl β-D-glucoside.

ENMR is also used to investigate two different mixed micelle

systems, with SDS as the charged surfactant component and

dodecyl malono-bis-N-methylglucamide (C12BNMG) respectively

tetra(ethylene oxide) dodecyl ether (C12EO4) as the nonionic

surfactant component. A method to calculate the degree

of counter-ion dissociation, αdissociation, as a function of composition

is demonstrated.

Finally diffusion NMR is used to compare transport dynamics

in gel electrolyte systems based on two differently grafted polymers;

one amphiphilic system containing polymethacrylate

grafted partly with polyethylene oxide and partly with fluorocarbons

and the corresponding nonamphiphilic system grafted

with only polyethylene oxide. Both systems contain the electrolyte

lithium bis(trifluoromethylsulfonyl) imide salt dissolved in

γ-butyrolactone. The results show that the system based on the

amphiphilic polymer has better transport dynamics and therefore

is more suited as material for battery

Place, publisher, year, edition, pages
2005. , x, 50 p.
Keyword [en]
Analytical chemistry, ENMR, electrophoretic NMR, dissusion NMR, electrophoretic mobility, double stimulated echo
Keyword [sv]
Analytisk kemi
National Category
Analytical Chemistry
URN: urn:nbn:se:kth:diva-119ISBN: 91-7283-924-4OAI: diva2:6980
Public defence
2005-02-08, Kollegiesalen, Valhallavägen 79, Stockholm, 10:15
Available from: 2005-02-04 Created: 2005-02-04 Last updated: 2012-03-21

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