Cellulose Films Depolarize Light

  • Author: Georg R. Meseck
  • Published: 07 February 2017
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
  • Source / Publisher: Advanced Materials/Wiley-VCH
thumbnail image: Cellulose Films Depolarize Light

Cellulose nanocrystals (CNCs) are a sustainable nanomaterial that can be obtained by the acid hydrolysis of bulk cellulose. When an aqueous suspension of CNC is left to dry, films that selectively reflect left-handed circularly polarized light (L-CPL) are formed. This effect is related to the characteristic chiral nematic order that the CNCs assume within the films.

Mark MacLachlan, University of British Columbia, Vancouver, Canada, and colleagues found that films cast from CNC suspensions with particularly high concentrations (≥ 10 wt%) show a quasi-nematic organization – in contrast to the well-known chiral nematic order. The resulting materials effectively depolarize CPL, are transparent, and the simple drop-casting route is practical for a variety of applications.

As an example, the team created a latent image made of quasi-nematic CNC written on a chiral nematic background. Upon observation through circular polarizers, the photonic image is revealed. This shows the method's promise for novel anticounterfeiting applications.


Article Views: 1205

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter

A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH