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Anomalous Diffusion-Assisted Brightness in White Cellulose Nanofibril Membranes

Accepted version
Peer-reviewed

Type

Article

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Authors

Toivonen, Matti S 
Onelli, Olimpia D 
Jacucci, Gianni 
Lovikka, Ville 
Rojas, Orlando J 

Abstract

The understanding of the interaction between light and complex, random structures is the key for designing and tailoring the optical appearance and performance of many materials that surround us, ranging from everyday consumer products, such as those for personal care, paints, and paper, to light diffusers used in the LED-lamps and solar cells. Here, it is demonstrated that the light transport in membranes of pure cellulose nanofibrils (CNFs) can be controlled to achieve bright whiteness in structures only a few micrometers thick. This is in contrast to other materials, such as paper, which require hundreds of micrometers to achieve a comparable appearance. The diffusion of light in the CNF membranes is shown to become anomalous by tuning the porosity and morphological features. Considering also their strong mechanical properties and biocompatibility, such white coatings are proposed as a new application for cellulose nanofibrils.

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Keywords

Journal Title

Advanced Materials

Conference Name

Journal ISSN

Volume Title

30

Publisher

Wiley-Blackwell
Sponsorship
Biotechnology and Biological Sciences Research Council (BB/K014617/1)
European Research Council (639088)
EPSRC (1525292)