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Nanoscience of Metal Silicate-Based Pigments

Published online by Cambridge University Press:  21 May 2014

Tina T. Salguero ,
Darrah Johnson-McDaniel ,
Christopher A. Barrett ,
Asma Sharafi ,
Richard Weimar  and
Terra Blevins
Tina T. Salguero
Affiliation:
Department of Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA. e-mail: salguero@uga.edu
Darrah Johnson-McDaniel
Affiliation:
Department of Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA. e-mail: salguero@uga.edu
Christopher A. Barrett
Affiliation:
Department of Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA. e-mail: salguero@uga.edu
Asma Sharafi
Affiliation:
Department of Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA. e-mail: salguero@uga.edu
Richard Weimar
Affiliation:
Department of Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA. e-mail: salguero@uga.edu
Terra Blevins
Affiliation:
Department of Chemistry, The University of Georgia, Athens, GA, 30602-2556, USA. e-mail: salguero@uga.edu
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Abstract

The colored component of several important ancient pigments, including Egyptian blue and Han blue, are based on alkali earth copper tetrasilicate materials. In recent work, we have found that these layered materials can be chemically exfoliated into their constituent monolayers to provide alkali earth copper tetrasilicate nanosheets—defined by nanometer thickness and lateral dimensions that are on the order of several microns. The facile exfoliation of these materials into nanosheets is especially surprising in view of their long history on artifacts under a variety of environmental conditions, and we have examined the issue of whether archaeological samples are affected by this exfoliation mechanism. We have characterized the properties of these nanosheets by an array of analytical techniques, including powder x-ray diffraction, photoluminescence measurements, and Raman spectroscopy. In all cases, we observe differences between nanosheet and bulk samples that originate from the loss of coupling between layers when going from three-dimensional to two- dimensional structures. Both CaCuSi4O10 nanosheets (derived from Egyptian blue) and BaCuSi4O10 nanosheets (derived from Han blue) have strong near-infrared luminescence properties like their bulk counterparts, yet they are amenable to modern solution processing methods. We have demonstrated ink jet printing with CaCuSi4O10 nanosheet inks, as well as the fabrication of nanosheet-based papers. Potential applications for these materials include NIR-based biomedical imaging and security inks.

Keywords

nanoscalelayeredoptical properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1618: Symposium 8A – Cultural Heritage and Archaeological Issues in Materials Science , 2014 , pp. 161 - 166
Copyright
Copyright © Materials Research Society 2014 

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