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Generation of superhydrophobic paper surfaces by a rapidly expanding supercritical carbon dioxide - alkyl ketene dimer solution
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry.
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
Elsevier B.V. , 2009. Vol. 49, no 1, 117-124 p.
Keyword [en]
Superhydrophobic surfarce, Alkyl ketene dimer, Rapid expansion of supercritical solution, RESS
National Category
Chemical Sciences
Research subject
Analytical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-113921DOI: 10.1016/j.supflu.2008.11.015ISI: 000266178500015OAI: oai:DiVA.org:uu-113921DiVA: diva2:292147
Available from: 2010-02-04 Created: 2010-02-04 Last updated: 2017-12-12Bibliographically approved

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