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Open AccessFeature PaperArticle

Eumelanin Coating of Silica Aerogel by Supercritical Carbon Dioxide Deposition of a 5,6-Dihydroxyindole Thin Film

Dipartimento Dell’Innovazione Industriale e Digitale-Ingegneria Chimica, Gestionale, Meccanica e Informatica, Università di Palermo, 90133 Palermo, Italy
Institute for Polymers, Composites and Biomaterials (IPCB), CNR, Via Campi Flegrei 34, I-80078 Pozzuoli (Na), Italy
Department of Chemical Sciences, University of Naples “Federico II” Via Cintia 4, I-80126 Naples, Italy
Nanofaber Spin-Off at Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy
Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1494;
Received: 25 July 2018 / Revised: 14 August 2018 / Accepted: 17 August 2018 / Published: 21 August 2018
(This article belongs to the Special Issue Thin Film Fabrication and Surface Techniques)
Eumelanin integration in silica aerogel (SA) was achieved via supercritical adsorption of 5,6-dyhydroxyindole (DHI) from CO2. Notably, after the supercritical treatment, DHI evolved towards spontaneous polymerization, which resulted in uniform pigment development over the SA. The new material was characterized for its morphological and physicochemical properties, disclosing the formation of a eumelanin-like coating, as confirmed by UV–vis and electron paramagnetic resonance (EPR) spectroscopy. View Full-Text
Keywords: eumelanins; silica aerogel; supercritical CO2 eumelanins; silica aerogel; supercritical CO2
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MDPI and ACS Style

Caputo, G.; Bonadies, I.; Migliaccio, L.; Caso, M.F.; Pezzella, A. Eumelanin Coating of Silica Aerogel by Supercritical Carbon Dioxide Deposition of a 5,6-Dihydroxyindole Thin Film. Materials 2018, 11, 1494.

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