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Dielectric properties of wood fibre components relevant for electrical insulation applications
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , 38 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:14
National Category
Chemical Engineering
Research subject
Fibre and Polymer Science
Identifiers
URN: urn:nbn:se:kth:diva-144611ISBN: 978-91-7595-103-4 (print)OAI: oai:DiVA.org:kth-144611DiVA: diva2:714343
Presentation
2014-05-09, K2, Teknikringen 28, KTH, Stockholm, 10:00 (Swedish)
Opponent
Supervisors
Note

QC 20140428

Available from: 2014-04-28 Created: 2014-04-27 Last updated: 2014-04-28Bibliographically approved
List of papers
1. Dielectric properties of lignin and glucomannan as determined by spectroscopic ellipsometry and Lifshitz estimates of non-retarded Hamaker constants
Open this publication in new window or tab >>Dielectric properties of lignin and glucomannan as determined by spectroscopic ellipsometry and Lifshitz estimates of non-retarded Hamaker constants
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2013 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 20, no 4, 1639-1648 p.Article in journal (Refereed) Published
Abstract [en]

We present in this study a quantitative estimate of the dispersive interactions between lignin, hemicellulose and cellulose, which are the dominating components in wood and also extensively used to produce paper and packaging materials. The dielectric properties in the UV-visible region of spin-coated films of pure lignin and glucomannan were determined by spectroscopic ellipsometry. The non-retarded Hamaker constants were estimated from the determined spectral parameters using Lifshitz theory for lignin and glucomannan interacting with cellulose, titania and calcium carbonate in vacuum, water and hexane. The Hamaker constants for the different combinations of cellulose, lignin and glucomannan fall within a relatively narrow range of 35-58 and 8-17 zJ, for the values in vacuum (air) and water, respectively. The estimated Hamaker constants for the interactions of the wood components with TiO2 and CaCO3, common additives in paper, in water range from 3 to 19 zJ, thus being similar in magnitude as the interactions between the wood components themselves. In contrast, the Hamaker constant is essentially zero for glucomannan interacting with calcium carbonate in hexane. The Hamaker constants for lignin, hemicellulose and cellulose determined in this study can provide information regarding the surface interactions important for e.g. adhesion, friction, swelling and wetting in paper processing as well as for the resulting behavior of paper products.

Keyword
Glucomannan, Lignin, Cellulose, Spectroscopic ellipsometry, Dispersion forces, Hamaker constant
National Category
Other Chemistry Topics Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-132212 (URN)10.1007/s10570-013-9980-9 (DOI)000322673000009 ()2-s2.0-84881028455 (Scopus ID)
Funder
Swedish Energy AgencySwedish Foundation for Strategic Research
Note

QC 20131024

Available from: 2013-10-24 Created: 2013-10-24 Last updated: 2017-12-06Bibliographically approved
2. Dielectric Response of Kraft-Pulp-based Electrical Insulation
Open this publication in new window or tab >>Dielectric Response of Kraft-Pulp-based Electrical Insulation
(English)Manuscript (preprint) (Other academic)
Identifiers
urn:nbn:se:kth:diva-144616 (URN)
Note

QS 2014

Available from: 2014-04-28 Created: 2014-04-28 Last updated: 2014-04-28Bibliographically approved

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