The effect of the cation composition on the synthesis and properties of ultramarine blue

The effect of the cation composition on the synthesis and properties of ultramarine blue

The effect of potassium cations on the shade of the ultramarine blue pigment system has been investigated through analysis of commercial materials, ion exchange reactions of sodium-form ultramarine blue and a detailed study of the effect of adding potassium sources to ultramarine precursor mixtures....

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Bibliographic Details
Published in:Dyes and pigments Vol. 58; no. 1; pp. 73 - 82
Main Authors: Booth, D.G., Dann, S.E., Weller, M.T.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01-07-2003
Elsevier
Subjects:
Applied sciences
Chemical industry and chemicals
Dyes, pigments
Exact sciences and technology
Industrial chemicals
Ion exchange
Potassium
Shade control
Ultramarine
Shade control
Ultramarine
Ion exchange
Potassium
Sodium Compounds
Inorganic pigment
Optical properties
Color
Aluminosilicates
Composition effect
Polysulfides
Potassium Compounds
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Summary:The effect of potassium cations on the shade of the ultramarine blue pigment system has been investigated through analysis of commercial materials, ion exchange reactions of sodium-form ultramarine blue and a detailed study of the effect of adding potassium sources to ultramarine precursor mixtures. Incorporation of potassium cations has the result of producing redder shade material and the replacement of around 20% of the sodium in the standard reaction mixture produces the optimised red-shade pigment. The origin of this hue control may be a direct effect, involving interaction of potassium ions with the ultramarine blue structure and the S3− chromophore or, more likely, potassium ions aids the stabilisation of S3− within the sodalite framework during the ultramarine blue formation process. In the commercial process, the role of the potassium source in red shade formation may be performed by the incorporation of potassium-rich feldspar additives.
ISSN:0143-7208
1873-3743
DOI:10.1016/S0143-7208(03)00037-8