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Linear Birefringent Films of Cellulose Nanocrystals Produced by Dip-Coating

Transparent films of cellulose nanocrystals (CNC) are prepared by dip-coating on glass substrates from aqueous suspensions of hydrolyzed filter paper. Dragging forces acting during films’ deposition promote a preferential alignment of the rod-shaped CNC. Films that are 2.8 and 6.0 µm in thickness sh...

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Detalles Bibliográficos
Autores principales: Mendoza-Galván, Arturo, Tejeda-Galán, Tania, Domínguez-Gómez, Amos B., Mauricio-Sánchez, Reina Araceli, Järrendahl, Kenneth, Arwin, Hans
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6359005/
https://www.ncbi.nlm.nih.gov/pubmed/30602653
http://dx.doi.org/10.3390/nano9010045
Descripción
Sumario:Transparent films of cellulose nanocrystals (CNC) are prepared by dip-coating on glass substrates from aqueous suspensions of hydrolyzed filter paper. Dragging forces acting during films’ deposition promote a preferential alignment of the rod-shaped CNC. Films that are 2.8 and 6.0 µm in thickness show retardance effects, as evidenced by placing them between a linearly polarized light source and a linear polarizer sheet in the extinction configuration. Transmission Mueller matrix spectroscopic ellipsometry measurements at normal incidence as a function of sample rotation were used to characterize polarization properties. A differential decomposition of the Mueller matrix reveals linear birefringence as the unique polarization parameter. These results show a promising way for obtaining CNC birefringent films by a simple and controllable method.