Natural Antireflective Microstructure of Blue Mussel Shells and Biomimetic Replication.
2020
Nature
provides various exquisite photonic structures of antireflection.
Here, we investigate the color and structure of the inner surface
of the shell edge (ISSE) of blue mussel shells, using a fiber optical
spectrometer, scanning electron microscope (SEM), and X-ray diffraction
(XRD). We demonstrate that the structurally assisted black color of
the ISSE is produced by a pyramidal microstructure. Furthermore, we
use the two-step biotemplate (TSBT) method to successfully replicate
this microstructure. Particularly, we modify this method by using
a poly(vinyl alcohol) (PVA) film as the negative replica and an epoxy
resin film as the positive replica both fabricated without vacuum
treatment. We show that the natural and replicated structures show
a reflectivity of ∼4% and of ∼3% in the visible wavelength.
Finally, we hope our investigation can provide basic data for the
study of the bioinspired antireflective structures, which have a promising
application in smart windows and optical devices.
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