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Determining the complex refractive index of cellulose nanocrystals by combination of Beer-Lambert and immersion matching methods
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design. University of Oulu, Oulu, Finland.
University of Oulu, Oulu, Finland.
University of Oulu, Oulu, Finland.
University of Oulu, Oulu, Finland.
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2019 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 235, p. 1-6Article in journal (Refereed) Published
Abstract [en]

Nanocelluloses have received significant interest due to their unique structural, mechanical, and optical properties. Nanocellulose refractive indices can be used to indicate many crucial characteristics, such as crystallinity, transparency, and purity. Thus, accurate measurement is important. This study describes a new method to determine the wavelength dependent complex refractive index of cellulose nanocrystals (CNCs) by the measurement of light transmittance with a spectrophotometer. The data analysis is based on a combination of the Beer-Lambert and immersion liquid matching equations. The immersion liquid method's main advantage is that it is independent of particle shape and size. Moreover, the measurement is easy and relatively quick to perform. The present procedure is not restricted to the nanocellulose and could potentially be applied to other nanomaterials, such as hyphenate nanoparticle-based, lignin nanoparticles, nanopigments, biological entities, structural elements of dielectric metamaterials, and nanoparticle-based composites. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. Vol. 235, p. 1-6
Keywords [en]
Beer-Lambert, Cellulose nanocrystals, Complex refractive index, Immersion matching method, Spectroscopy, Cellulose, Cellulose derivatives, Crystallinity, Nanocellulose, Nanocrystals, Nanoparticles, Particle size analysis, Accurate measurement, Cellulose nano-crystals, Cellulose nanocrystal (CNCs), Immersion liquid methods, Matching methods, Particle shape and size, Refractive index
Identifiers
URN: urn:nbn:se:miun:diva-36688DOI: 10.1016/j.jqsrt.2019.06.023Scopus ID: 2-s2.0-85067548357OAI: oai:DiVA.org:miun-36688DiVA, id: diva2:1336514
Available from: 2019-07-09 Created: 2019-07-09 Last updated: 2019-07-09Bibliographically approved

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Niskanen, IlpoThungström, Göran

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