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Experimental Studies of Self-organization from Electrically Polarized Clay Particles
Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, Department of Physics.
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
NTNU, 2011.
Series
Doctoral theses at NTNU, ISSN 1503-8181 ; 2011:279
National Category
Physics
Identifiers
URN: urn:nbn:no:ntnu:diva-15260ISBN: 978-82-471-3127-5 (printed ver.)ISBN: 978-82-471-3128-2 (electronic ver.)OAI: oai:DiVA.org:ntnu-15260DiVA: diva2:480943
Public defence
2011-10-27, 00:00
Available from: 2012-01-20 Created: 2012-01-20 Last updated: 2014-04-29Bibliographically approved
List of papers
1. Dynamic column formation in Na-FLHC clay particles: Wide angle Xray scattering and rheological studies
Open this publication in new window or tab >>Dynamic column formation in Na-FLHC clay particles: Wide angle Xray scattering and rheological studies
2009 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 149Article in journal (Refereed) Published
Identifiers
urn:nbn:no:ntnu:diva-15249 (URN)10.1088/1742-6596/149/1/012026 (DOI)
Note

Published under licence in Journal of Physics: Conference Series by IOP Publishing Ltd

Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2014-04-29Bibliographically approved
2. Electric field induced structuring in clay-oil suspensions: new insights from WAXS, SEM, leak current, dielectric permittivity, and rheometry
Open this publication in new window or tab >>Electric field induced structuring in clay-oil suspensions: new insights from WAXS, SEM, leak current, dielectric permittivity, and rheometry
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2010 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 22, no 32, 324104- p.Article in journal (Refereed) Published
Abstract [en]

The electric field induced structuring in clay-oil suspensions has been studied by means of wide angle x-ray scattering (WAXS), rheometry, scanning electron microscopy (SEM), as well as leak current density and dielectric constant measurements. The clay particles' orientation distribution was inferred from the azimuthal changes of the clay diffraction peak intensity. The angular width of that distribution was quantified through an orientational order parameter. Chain and column formation processes were distinguished by comparison of the time evolution of the diffraction peak amplitude with that of the current density. Leak current density was measured for different electric field strengths E and clay particle concentrations Phi. The following scaling relation was found: J proportional to Phi(0.74)E(2.12). In addition, the dependence of the yield stress on the electric field and on the particle concentration was measured and shown to scale as: tau(y) proportional to Phi(0.87)E(1.66).

Identifiers
urn:nbn:no:ntnu:diva-15244 (URN)10.1088/0953-8984/22/32/324104 (DOI)000280542900009 ()
Note

Copyright © Institute of Physics and IOP Publishing Limited 2007 - 2012

Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2014-04-29Bibliographically approved
3. Electrorheological properties of organically modified nanolayered laponite: influence of intercalation, adsorption and wettability
Open this publication in new window or tab >>Electrorheological properties of organically modified nanolayered laponite: influence of intercalation, adsorption and wettability
2009 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 19, no 13, 1816-1828 p.Article in journal (Refereed) Published
Abstract [en]

Cetyltrimethylammonium bromide (CTAB) modified synthetic laponite is synthesized by an ion exchange method and characterized by simultaneous small-angle X-ray scattering (SAXS) and wide angle X-ray scattering (WAXS), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectrometry (EDS), atomic force microscopy (AFM), thermal analysis and rheometry. Through the formation of the organoclay, the properties of clay change from hydrophilic to hydrophobic. Morphology results show that the hydrophilic particles are aggregating easily, whereas the suitable CTAB modified laponite can get near monodispersed nanoparticles due to its hydrophobic properties. It is proposed that CTAB is intercalated and adsorbed onto the laponite partially depending on the substituted concentration of the surfactant cation exchange capacity (CEC) (0.5CEC to 6CEC). The electrorheological (ER) effect is investigated for suspensions of CTAB modified laponite dispersed in silicone oil. The two-dimensional SAXS images from ER bundles of CTAB modified laponite exhibit markedly anisotropic SAXS patterns, giving a measure for laponite particle alignment within the ER structure. An optimum electrorheological effect can be attained at a particular CEC substituted concentration. On the basis of the structure analysis and dielectric measurements, we attribute the enhancement of ER activity to the improvement in the dielectric properties that showed an increase in the dielectric constant and the dielectric loss at low frequency and their regular optimum change with CTAB modification.

Identifiers
urn:nbn:no:ntnu:diva-15246 (URN)10.1039/b818502f (DOI)000264254500007 ()
Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2012-07-02Bibliographically approved
4. E-field Induced Alignment from Organically Modified Fluorohectorite Clay Particles
Open this publication in new window or tab >>E-field Induced Alignment from Organically Modified Fluorohectorite Clay Particles
(English)Manuscript (preprint) (Other academic)
Identifiers
urn:nbn:no:ntnu:diva-15251 (URN)
Note

The final publication is available at link.springer.com

The European Physical Journal E, 35:9

doi:10.1140/epje/i2012-12009-x

 

 

Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2014-04-29Bibliographically approved
5. Different Aspects of Electrically Activated PP/Clay Nanocomposites
Open this publication in new window or tab >>Different Aspects of Electrically Activated PP/Clay Nanocomposites
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(English)Manuscript (preprint) (Other academic)
Identifiers
urn:nbn:no:ntnu:diva-15252 (URN)
Note

accepted in Applied Clay Science

In Press

http://dx.doi.org/10.1016/j.clay.2014.03.011

Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2014-04-29Bibliographically approved
6. Characterisation of Paraffin/Clay Composites.
Open this publication in new window or tab >>Characterisation of Paraffin/Clay Composites.
(English)Manuscript (preprint) (Other academic)
Identifiers
urn:nbn:no:ntnu:diva-15253 (URN)10.1557/jmr.2013.104 (DOI)
Note

Published in Journal of Materials Research: DOI:10.1557/jmr.2013.104 with the following title: Electric field nematic alignment of fluorohectorite clay particles in oligomeric matrices

 

Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2014-04-29Bibliographically approved
7. Electric Field Induced Structuring and Rheological Properties of Kaolinite and Halloysite Clays
Open this publication in new window or tab >>Electric Field Induced Structuring and Rheological Properties of Kaolinite and Halloysite Clays
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2013 (English)In: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053, Vol. 77-78, 1-9 p.Article in journal (Other academic) Published
Place, publisher, year, edition, pages
Elsevier, 2013
Identifiers
urn:nbn:no:ntnu:diva-15254 (URN)10.1016/j.clay.2013.03.014 (DOI)
Note

“NOTICE: this is the author’s version of a work that was accepted for publication in Applied Clay Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Clay Science,VOL 77-78, June 2013, Pages 1–9 http://dx.doi.org/10.1016/j.clay.2013.03.014€¨

Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2014-04-29Bibliographically approved
8. Structuring from nanoparticles in oil-based ferrofluids
Open this publication in new window or tab >>Structuring from nanoparticles in oil-based ferrofluids
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2011 (English)In: The European Physical Journal E Soft matter, ISSN 1292-8941, E-ISSN 1292-895X, Vol. 34, no 3Article in journal (Refereed) Published
Abstract [en]

The effect of magnetic field on the structure formation in an oil-based magnetic fluid with various concentrations of magnetite particles was studied. The evaluation of the experimental data obtained from small-angle X-ray scattering and ultrasonic attenuation indicates the formation of chain-like aggregates composed of magnetite particles. The experimental data obtained from ultrasonic spectroscopy fit well with the recent theoretical model by Shliomis, Mond and Morozov but only for a diluted magnetic fluid. In this model it is assumed that a dimer is the main building block of a B-field-induced chain-like structure, thus the estimation of the nematic order parameter does not depend on the actual length of the structure. The scattering method used reveals information about the aggregated structure size and relative changes in the degree of anisotropy in qualitative terms. The coupling constant lambda, concentrations phi, average particle size d and its polydispersity sigma were initially obtained using the vibrating sample magnetometry and these results were further confirmed by rheometry and scattering methods. Both the particles' orientational distribution and the nematic order parameter S were inferred from the ultrasonic measurements. The investigation of SAXS patterns reveals the orientation and sizes of aggregated structures under application of different magnetic-field strengths. In addition, the magnetic-field-dependent yield stress was measured, and a relationship between the yield stress and magnetic-field strength up to 0.5T was established.

Place, publisher, year, edition, pages
Springer, 2011
Identifiers
urn:nbn:no:ntnu:diva-15245 (URN)10.1140/epje/i2011-11028-5 (DOI)000288549500007 ()
Note

 

© The Author(s) 2011. This article is published with open access at Springerlink.com

Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2014-04-29Bibliographically approved
9. Wide Angle Scattering Study of nanolayered Clay/gelatin Electrorheological Elastomer
Open this publication in new window or tab >>Wide Angle Scattering Study of nanolayered Clay/gelatin Electrorheological Elastomer
2009 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 149, 012032-1-012032-7 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:no:ntnu:diva-15256 (URN)10.1088/1742-6596/149/1/012032 (DOI)
Note
Published under licence in Journal of Physics: Conference Series by IOP Publishing LtdAvailable from: 2012-01-20 Created: 2012-01-20 Last updated: 2012-07-02Bibliographically approved

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