Gaseous adsorption in melanins: Hydrophilic biomacromolecules with high electrical conductivities

Mostert, A. Bernardus, Davy, Karl J.P., Ruggles, Jeremy L., Powell, Ben J., Gentle, Ian R. and Meredith, Paul (2009) Gaseous adsorption in melanins: Hydrophilic biomacromolecules with high electrical conductivities. Langmuir, 26 1: 412-416. doi:10.1021/la901290f


Author Mostert, A. Bernardus
Davy, Karl J.P.
Ruggles, Jeremy L.
Powell, Ben J.
Gentle, Ian R.
Meredith, Paul
Title Gaseous adsorption in melanins: Hydrophilic biomacromolecules with high electrical conductivities
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
Publication date 2009-11-11
Sub-type Article (original research)
DOI 10.1021/la901290f
Volume 26
Issue 1
Start page 412
End page 416
Total pages 5
Editor David G Whitten
Josef F Holzwarth
Ralph G Nuzzo
Richard Crooks
Place of publication United States
Publisher American Chemical Society
Collection year 2010
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
970103 Expanding Knowledge in the Chemical Sciences
020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity
020499 Condensed Matter Physics not elsewhere classified
030607 Transport Properties and Non-equilibrium Processes
091208 Organic Semiconductors
Abstract The melanins are an important class of multifunctional biomacromolecules that possess a number of intriguing physical and chemical properties including electrical and photoconductivity. Unusually for a conducting organic material, eumelanin is hydrophilic and its electrical properties are strongly dependent on its hydration state. We have therefore measured adsorption isotherms for two polar adsorbates, water and ethanol, in the pressed powder pellets of synthetic eumelanin typically used in electrical studies. We show that a simple kinetic monolayer Langmuir model describes the adsorption and find that there are strong adsorbate−eumelanin interactions in both cases. These isotherms allow the proper scaling of electrical conductivity data and in doing so make progress toward a better understanding of eumelanin electrical properties, which is a critical prerequisite to the design of new eumelanin-like bioelectronic materials.
Keyword SYNTHETIC DOPA-MELANIN
POLYMER
PHOTOCONDUCTIVITY
SEMICONDUCTION
EUMELANINS
PROPERTY
PROTEINS
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Sun, 10 Jan 2010, 00:03:50 EST