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Generating in-Plane Orientational Order in Multilayer Films Prepared by Spray-Assisted Layer-by-Layer Assembly
CNRS Institut Charles Sadron, France.
CNRS Institut Charles Sadron, France.
RISE, Innventia. RISE - Research Institutes of Sweden, Bioeconomy.
RISE, Innventia. RISE - Research Institutes of Sweden, Bioeconomy.
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2017 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 11, no 1, 84-94 p.Article in journal (Refereed) Published
Abstract [en]

We present a simple yet efficient method for orienting cellulose nanofibrils in layer-by-layer assembled films through spray-assisted alignment. While spraying at 90° against a receiving surface produces films with homogeneous in-plane orientation, spraying at smaller angles causes a macroscopic directional surface flow of liquid on the receiving surface and leads to films with substantial in-plane anisotropy when nanoscale objects with anisotropic shapes are used as components. First results with cellulose nanofibrils demonstrate that such fibrils are easily aligned by grazing incidence spraying to yield optically birefringent films over large surface areas. We show that the cellulosic nanofibrils are oriented parallel to the spraying direction and that the orientational order depends for example on the distance of the receiving surface from the spray nozzle. The alignment of the nanofibrils and the in-plane anisotropy of the films were independently confirmed by atomic force microscopy, optical microscopy between crossed polarizers, and the ellipsometric determination of the apparent refractive index of the film as a function of the in-plane rotation of the sample with respect to the plane of incidence of the ellipsometer.

Place, publisher, year, edition, pages
2017. Vol. 11, no 1, 84-94 p.
Keyword [en]
anisotropic materials, cellulose nanofibrils, in-plane orientation, layer-by-layer assembly, polyelectrolyte multilayers, spray-assisted alignment
National Category
Nano Technology Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-29744DOI: 10.1021/acsnano.6b04191Scopus ID: 2-s2.0-85018474813OAI: oai:DiVA.org:ri-29744DiVA: diva2:1103352
Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-10-06Bibliographically approved

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CiteExportLink to record
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