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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, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.ORCID-id: 0000-0001-8622-0386
Department of Physical and Analytical Chemistry, Uppsala University.
2009 (Engelska)Ingår i: Journal of Supercritical Fluids, ISSN 0896-8446, E-ISSN 1872-8162, Vol. 49, nr 1, s. 117-124Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2009. Vol. 49, nr 1, s. 117-124
Nyckelord [en]
Superhydrophobic surface, Alkyl ketene dimer, Rapid expansion of, supercritical solution, RESS, particle formation, solutions ress, expansion, fluids, micronization, nanomaterials, ibuprofen, crystals, behavior, system
Nationell ämneskategori
Kemi
Identifikatorer
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, id: diva2:336483
Anmärkning
QC 20100525Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
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
Öppna denna publikation i ny flik eller fönster >>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 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2008. s. ix, 76
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2008:26
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:kth:diva-4714 (URN)978-91-7178-946-4 (ISBN)
Disputation
2008-05-09, D2, KTH, Lindstedtsvägen 5, Stockholm, 10:00
Opponent
Handledare
Anmärkning
QC 20100917Tillgänglig från: 2008-04-29 Skapad: 2008-04-29 Senast uppdaterad: 2010-09-17Bibliografiskt granskad

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