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Dynamics of moisture interaction with polyelectrolyte multilayers containing nanofibrillated cellulose
Innventia AB.
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design. (DPC)
Innventia AB, Box 5604, 104 86 Stockholm, Sweden.
Innventia AB, Box 5604, 104 86 Stockholm, Sweden.
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2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 2, p. 496-499Article in journal (Refereed) Published
Abstract [en]

Recent findings have shown that it is possible to use the Layer-by-Layer technique to create nanofibrillated cellulose / polyethyleneimine interference films whose colour change with relative humidity. This study uses different optical models to describe spectral ellipsometry measurements data of interference films and how the film properties alter in dry and humid environments. The results indicate that water condensation initially is filling the surface pores within seconds whereas relaxation of the film to adjust to the added water is a slower process that reaches a steady state after ≈20 min. The maximum swelling ratio of the LbL films is almost independent of the number of layers within the film, but decreases considerably by crosslinking via heat treatment. The films show a distinct birefringence with optical axis perpendicular to the surface. Analysis of the moisture response with different optical models indicates that the films swell uniformly in the thickness direction with no separate water film on top. The results provide important understanding for the design of NFC based LbL films for visual moisture sensors and interactive security paper. 

Place, publisher, year, edition, pages
2012. Vol. 27, no 2, p. 496-499
Keywords [en]
Colour; Interference; Layer-by-Layer; Nanofibrillated cellulose; Optics
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:miun:diva-16872DOI: 10.3183/NPPRJ-2012-27-02-p496-499Scopus ID: 2-s2.0-84865218419OAI: oai:DiVA.org:miun-16872DiVA, id: diva2:547457
Available from: 2012-08-28 Created: 2012-08-28 Last updated: 2017-12-07Bibliographically approved

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