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Superhydrophobic Cellulosic Surfaces: Preparation and Characterisation of Superhydrophobic Cellulosic Surfaces. Investigation of the Free Energy Barriers Between Cassie-Baxter and Wenzel States of Wetting
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
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: urn:nbn:se:kth:diva-4714ISBN: 978-91-7178-946-4 (tryckt)OAI: oai:DiVA.org:kth-4714DiVA, id: diva2:13579
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
Delarbeten
1. Wetting of structured hydrophobic surfaces by water droplets
Öppna denna publikation i ny flik eller fönster >>Wetting of structured hydrophobic surfaces by water droplets
2005 (Engelska)Ingår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 21, nr 26, s. 12235-12243Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Super-hydrophobic surfaces may arise due to an interplay between the intrinsic, relatively high, contact angle of the more or less hydrophobic solid surface employed and the geometric features of the solid surface. In the present work, this relationship was investigated for a range of different surface geometries, making use of surface free energy minimization. As a rule, the free energy minima (and maxima) occur when the Laplace and Young conditions are simultaneously fulfilled. Special effort has been devoted to investigating the free energy barriers present between the Cassie-Baxter (heterogeneous wetting) and Wenzel (homogeneous wetting) modes. The predictions made on the basis of the model calculations compare favorably with experimental results presented in the literature.

Nyckelord
rough surfaces, superhydrophobic surfaces, sliding angles, wettability, behavior, polymer, films
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:kth:diva-15261 (URN)10.1021/la052415+ (DOI)000234063000030 ()2-s2.0-29844452782 (Scopus ID)
Anmärkning
QC 20100525Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
2. Characterisation of Wetting by Solidification of Agarose Solution Sessile Drops
Öppna denna publikation i ny flik eller fönster >>Characterisation of Wetting by Solidification of Agarose Solution Sessile Drops
2008 (Engelska)Ingår i: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 22, nr 15, s. 1919-1929Artikel, forskningsöversikt (Refereegranskat) Published
Abstract [en]

A new method for characterising the wetting of structured surfaces is presented. Sessile drops of a warm agarose solution were placed on test surfaces and then removed after the gelation of the agarose solution caused by the cooling of the drop. By studying the base of the sessile drops using confocal microscopy and image processing it was possible to determine the wetting mode and general appearance of the liquid-gas interface beneath the drop. The method also shows potential to measure the wetted area, and local contact angles beneath the footprint of a sessile drop. The applicability of the method was also demonstrated by its application to periodically structured photopolymer plates and surfaces covered by microsized glass spheres.

Nyckelord
Superhydrophobic, characterisation, agarose, heterogenous wetting, sessile drop, rough surfaces, water droplets, polymer, angles
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:kth:diva-18094 (URN)10.1163/156856108x320069 (DOI)000262393500009 ()2-s2.0-68949127035 (Scopus ID)
Anmärkning

QC 20100525

Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2019-09-18Bibliografiskt granskad
3. Patterning of surfaces with nanosized cellulosic fibrils using microcontact printing and a lift-off technique
Öppna denna publikation i ny flik eller fönster >>Patterning of surfaces with nanosized cellulosic fibrils using microcontact printing and a lift-off technique
Visa övriga...
2008 (Engelska)Ingår i: Soft Matter, ISSN 1744-683X, Vol. 4, nr 6, s. 1158-1160Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Microfibrillar cellulose has been organised into nanofilms with well-controlled features. This has been achieved with adsorption onto microcontact printed surfaces and with a novel microcontact lift-off technique.

Nyckelord
polyelectrolyte multilayers, microfibrillated cellulose
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:kth:diva-17537 (URN)10.1039/b715914e (DOI)000255927700005 ()2-s2.0-43749094328 (Scopus ID)
Anmärkning

QC 20100525

Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2016-12-19Bibliografiskt granskad
4. Generation of superhydrophobic paper surfaces by a rapidly expanding supercritical carbon dioxide-alkyl ketene dimer solution
Öppna denna publikation i ny flik eller fönster >>Generation of superhydrophobic paper surfaces by a rapidly expanding supercritical carbon dioxide-alkyl ketene dimer solution
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.

Nyckelord
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:nbn:se:kth:diva-18436 (URN)10.1016/j.supflu.2008.11.015 (DOI)000266178500015 ()2-s2.0-64249116526 (Scopus ID)
Anmärkning
QC 20100525Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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