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Green colored nano-pigments derived from Y2BaCuO5: NIR reflective coatings

Jose, Sheethu and Prakash, Aiswaria and Laha, Sourav and Natarajan, Srinivasan and Reddy, Mundlapudi Lakshmipathi (2014) Green colored nano-pigments derived from Y2BaCuO5: NIR reflective coatings. In: DYES AND PIGMENTS, 107 . pp. 118-126.

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Official URL: http://dx.doi.org/10.1016/j.dyepig.2014.03.025

Abstract

A green colored nano-pigment Y2BaCuO5 with impressive near infra-red (NIR) reflectance (61% at 1100 nm) was synthesized by a nano-emulsion method. The developed nano-crystalline powders were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), UV-vis-NIR diffuse reflectance spectroscopy and CIE-L*a*b* 1976 color scales. The XRD and Rietveld analyses of the designed pigment powders reveal the orthorhombic crystal structure for Y2BaCuO5, where yttrium is coordinated by seven oxygen atoms with the local symmetry of a distorted trigonal prism, barium is coordinated by eleven oxygen atoms, and the coordination polyhedron of copper is a distorted square pyramid CuO5]. The UV-vis spectrum of the nano-pigment exhibits an intense d-d transition associated with CuO5 chromophore between 2.1 and 2.5 eV in the visible domain. Therefore, a green color has been displayed by the developed nano-pigment. The potential utility of the nano-pigments as ``Cool Pigments'' was demonstrated by coating on to a building roofing material like cement slab and PVC coatings. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords: Nano-pigments; Green-colorants; NIR reflective; Energy saving; Polymer-coatings; Building roof-coatings
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 27 Jun 2014 05:00
Last Modified: 27 Jun 2014 05:00
URI: http://eprints.iisc.ac.in/id/eprint/49356

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