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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, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
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: urn:nbn:se:kth:diva-4714ISBN: 978-91-7178-946-4 (print)OAI: oai:DiVA.org:kth-4714DiVA: diva2:13579
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
List of papers
1. Wetting of structured hydrophobic surfaces by water droplets
Open this publication in new window or tab >>Wetting of structured hydrophobic surfaces by water droplets
2005 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 21, no 26, 12235-12243 p.Article in journal (Refereed) 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.

Keyword
rough surfaces, superhydrophobic surfaces, sliding angles, wettability, behavior, polymer, films
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-15261 (URN)10.1021/la052415+ (DOI)000234063000030 ()2-s2.0-29844452782 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
2. Characterisation of Wetting by Solidification of Agarose Solution Sessile Drops
Open this publication in new window or tab >>Characterisation of Wetting by Solidification of Agarose Solution Sessile Drops
2008 (English)In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 22, no 15, 1919-1929 p.Article, review/survey (Refereed) 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.

Keyword
Superhydrophobic, characterisation, agarose, heterogenous wetting, sessile drop, rough surfaces, water droplets, polymer, angles
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-18094 (URN)10.1163/156856108x320069 (DOI)000262393500009 ()2-s2.0-68949127035 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
3. Patterning of surfaces with nanosized cellulosic fibrils using microcontact printing and a lift-off technique
Open this publication in new window or tab >>Patterning of surfaces with nanosized cellulosic fibrils using microcontact printing and a lift-off technique
Show others...
2008 (English)In: Soft Matter, ISSN 1744-683X, Vol. 4, no 6, 1158-1160 p.Article in journal (Refereed) 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.

Keyword
polyelectrolyte multilayers, microfibrillated cellulose
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-17537 (URN)10.1039/b715914e (DOI)000255927700005 ()2-s2.0-43749094328 (Scopus ID)
Note

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2016-12-19Bibliographically approved
4. Generation of superhydrophobic paper surfaces by a rapidly expanding supercritical carbon dioxide-alkyl ketene dimer solution
Open this publication in new window or tab >>Generation of superhydrophobic paper surfaces by a rapidly expanding supercritical carbon dioxide-alkyl ketene dimer solution
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.

Keyword
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:nbn:se:kth:diva-18436 (URN)10.1016/j.supflu.2008.11.015 (DOI)000266178500015 ()2-s2.0-64249116526 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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