The structural impact of water sorption on device-quality melanin thin films

Soft Matter
Andrew J ClulowPaul Meredith

Abstract

The melanins are a class of pigmentary bio-macromolecules ubiquitous in the biosphere. They possess an intriguing set of physico-chemical properties and have been shown to exhibit hybrid protonic-electronic electrical conductivity, a feature derived from a process termed chemical self-doping driven by the sorption of water. Although the mechanism underlying the electrical conduction has been established, how the sorbed water interacts with the melanin structure at the physical level has not. Herein we use neutron reflectometry to study changes in the structure of synthetic melanin thin films as a function of H2O and D2O vapour pressure. Water is found to be taken up evenly throughout the films, and by employing the contrast effect, the existence of labile protons through reversible deuterium exchange is demonstrated. Finally, we determine a sorption isotherm to enable quantification of the melanin-water interactions.

References

Apr 21, 1994·Biochimica Et Biophysica Acta·G W ZajacA E Alvarado-Swaisgood
Jan 1, 1995·Journal of Biomaterials Science. Polymer Edition·M M JastrzebskaH Stubb
Apr 8, 2004·Photochemistry and Photobiology·Paul Meredith, Jennifer Riesz
Nov 16, 2004·Pigment Cell Research·Fabio A ZuccaLuigi Zecca
May 25, 2005·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Jennifer RieszPaul Meredith
Dec 28, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Andrew NelsonMichael James
Sep 27, 2006·Proceedings of the National Academy of Sciences of the United States of America·William D BushJohn D Simon
Nov 7, 2006·Pigment Cell Research·Paul Meredith, Tadeusz Sarna
Feb 23, 2007·Nature·Vanessa Gray-SchopferRichard Marais
Jul 20, 2007·Nature·Haeshin LeePhillip B Messersmith
Oct 20, 2007·Science·Haeshin LeePhillip B Messersmith
Feb 5, 2009·The European Physical Journal. E, Soft Matter·M AbbasR Gunnella
Dec 30, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·A Bernardus MostertPaul Meredith
May 23, 2012·Proceedings of the National Academy of Sciences of the United States of America·Albertus B MostertPaul Meredith
Oct 15, 2013·Advanced Materials·Jonathan RivnayGeorge G Malliaras
Dec 11, 2013·Proceedings of the National Academy of Sciences of the United States of America·Young Jo KimChristopher J Bettinger
Apr 23, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·W Peter KalisvaartWalter Mérida
Nov 19, 2015·The Journal of Physical Chemistry. B·Shermiyah B RieneckerPaul Meredith
Aug 21, 2013·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Julia WünscheClara Santato
Dec 12, 2006·Soft Matter·Paul MeredithEvan G Moore

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Citations

Sep 8, 2017·International Journal of Molecular Sciences·Anne BüngelerOliver I Strube
Aug 12, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·A Bernardus MostertPaul Meredith
Nov 7, 2020·The Journal of Physical Chemistry. B·J V PaulinA B Mostert
Aug 12, 2021·Soft Matter·J A Martinez-GonzalezA B Mostert

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