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Three-component Langmuir-Blodgett films with a controllable degree of polarity
YKI – Ytkemiska institutet.
1994 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 10, 1225-1234 p.Article in journal (Refereed)
Abstract [en]

Two different series of mixed Langmuir-Blodgett (LB) films with a controllable degree of polarity, deposited on mica, have been studied by wetting and surface force techniques. Both series contain of 50% eicosylamine (EA). Films of one series consist of EA, arachidic acid and docosanedioic acid, while those of the other consist of EA, 1-eicosanol and 1,22-docosanediol. Carboxylic acid groups give lower contact angles than hydroxy groups. Concerning the stability of the LB films in aqueous solutions, repeated exposure to a three-phase line and high salt solutions were found to cause breakdown. Surface force measurements on carboxylic acid-containing films show that films with a 0% (contact angle = 113°) and 25% (contact angle ≈ 90°) content of diacid interact with a long-range (hydrophobic) attraction across water. No similar long-range attraction is observed for the 50% case (contact angle ≈ 65°). Surface force measurements also detected instabilities and imperfections of the films.

Place, publisher, year, edition, pages
1994. Vol. 10, 1225-1234 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27276OAI: oai:DiVA.org:ri-27276DiVA: diva2:1054280
Note
A850Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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