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Generation of superhydrophobic paper surfaces by a rapidly expanding supercritical carbon dioxide-alkyl ketene dimer solution
Department of Physical and Analytical Chemistry, Uppsala University.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
Department of Physical and Analytical Chemistry, Uppsala University.
2009 (English)In: Journal of Supercritical Fluids, ISSN 0896-8446, E-ISSN 1872-8162, Vol. 49, no 1, 117-124 p.Article in journal (Refereed) Published
Abstract [en]

Superhydrophobic alkyl ketene dimer (AKD) layers were successfully produced on top of untreated paper surfaces by a rapid expansion of supercritical CO2 solution (RESS) process. The new method resulted in a degree of hydrophobicity, as measured by contact angles of water droplets on AKD surfaces, dramatically higher, up to 173 degrees, compared to a conventional method consisting in melting AKD granules directly on the paper substrate, giving contact angles of around 109 degrees. Experiments were conducted to investigate the effects of varying pre-expansion pressure (100-300 bar), pre-expansion temperature (40 and 60 degrees C) and spraying distance (10 and 50 mm) on the properties of the treated surfaces. The surfaces were analyzed regarding AKD particle size, surface morphology and hydrophobicity with the aid of scanning electron microscopy (SEM) and contact angle measurements. The average AKD particle size after RESS processing was between 1 and 2 mu m depending upon the experimental conditions used, being slightly smaller when using higher pre-expansion pressure and temperature as well as shorter spraying distance.

Place, publisher, year, edition, pages
2009. Vol. 49, no 1, 117-124 p.
Keyword [en]
Superhydrophobic surface, Alkyl ketene dimer, Rapid expansion of, supercritical solution, RESS, particle formation, solutions ress, expansion, fluids, micronization, nanomaterials, ibuprofen, crystals, behavior, system
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-18436DOI: 10.1016/j.supflu.2008.11.015ISI: 000266178500015Scopus ID: 2-s2.0-64249116526OAI: oai:DiVA.org:kth-18436DiVA: diva2:336483
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Superhydrophobic Cellulosic Surfaces: Preparation and Characterisation of Superhydrophobic Cellulosic Surfaces. Investigation of the Free Energy Barriers Between Cassie-Baxter and Wenzel States of Wetting
Open this publication in new window or tab >>Superhydrophobic Cellulosic Surfaces: Preparation and Characterisation of Superhydrophobic Cellulosic Surfaces. Investigation of the Free Energy Barriers Between Cassie-Baxter and Wenzel States of Wetting
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2008. ix, 76 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:26
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-4714 (URN)978-91-7178-946-4 (ISBN)
Public defence
2008-05-09, D2, KTH, Lindstedtsvägen 5, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100917Available from: 2008-04-29 Created: 2008-04-29 Last updated: 2010-09-17Bibliographically approved

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Wågberg, Lars

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