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Structural Color and Iridescence in Transparent Sheared Cellulosic Films
Author(s) -
Fernandes Susete N.,
Geng Yong,
Vignolini Silvia,
Glover Beverley J.,
Trindade Ana C.,
Canejo João P.,
Almeida Pedro L.,
Brogueira Pedro,
Godinho Maria H.
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201200351
Subject(s) - iridescence , materials science , structural coloration , rod , nanocrystalline material , cellulose , composite material , optics , shear (geology) , nanotechnology , optoelectronics , chemical engineering , medicine , physics , alternative medicine , engineering , photonic crystal , pathology
Abstract Shear transparent cellulose free‐standing thin films can develop iridescence similar to that found in petals of the tulip “Queen of the Night.” The iridescence of the film arises from the modulation of the surface into bands periodically spread perpendicular to the shear direction. Small amounts of nanocrystalline cellulose (NCC) rods in the precursor liquid‐crystalline solutions do not disturb the optical properties of the solutions but enhance the mechanical characteristics of the films and affects their iridescence. Smaller bands periodicity, not affected by the NCC rods, slightly deviated from the shear direction is also observed. NCCs are crucial to tune and understand the film's surface features formation. Our findings could lead to new materials for application in soft reflective screens and devices.