Laser imaging polarimetry of nacre.

Abstract:

:Nacre is a complex biomaterial made of aragonite-tablet bricks and organic mortar that is considerably resilient against breakage. Nacre has been studied with a wide range of laboratory techniques, leading to understanding key fundamentals and informing the creation of bio-inspired materials. In this article, we present an optical polarimetric technique to investigate nacre, taking advantage of the translucence and birefringence of its microcomponents. We focus our study on 3 classes of mollusks that have nacreous shells: bivalve (Pinctada fucata), gastropod (Haliotis asinina and Haliotis rufescens) and cephalopod (Nautilus pompilius). We sent polarized light from a laser through thin samples of nacre and did imaging polarimetry of the transmitted light. We observed clear distinctions between the structures of bivalve and gastropod, due to the spatial variation of their birefringence. The patterns for cephalopod were more similar to bivalve than gastropod. Bleaching of the samples disrupted the transmitted light. Subsequent refilling of the bivalve and gastropod nacre samples with oil produced optical patterns similar to those of unbleached samples. In cephalopod samples, we found that bleaching produced irreversible changes in the optical pattern.

journal_name

J Biophotonics

journal_title

Journal of biophotonics

authors

Jones JA,Metzler RA,D'Addario AJ,Burgess C,Regan B,Spano S,Cvarch BA,Galvez EJ

doi

10.1002/jbio.201800026

subject

Has Abstract

pub_date

2018-10-01 00:00:00

pages

e201800026

issue

10

eissn

1864-063X

issn

1864-0648

journal_volume

11

pub_type

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