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. 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.
ultramarine, potassium, shade control, ion exchange
73-82
Booth, D.G.
7208ed16-9ff7-4094-b14d-ad15bd945d2d
Dann, S.E.
55ae7ba7-dfcd-4a5b-8329-5c957b7c006e
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
2003
Booth, D.G.
7208ed16-9ff7-4094-b14d-ad15bd945d2d
Dann, S.E.
55ae7ba7-dfcd-4a5b-8329-5c957b7c006e
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Booth, D.G., Dann, S.E. and Weller, M.T.
(2003)
The effect of the cation composition on the synthesis and properties of ultramarine blue.
Dyes and Pigments, 58 (1), .
(doi:10.1016/S0143-7208(03)00037-8).
Abstract
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.
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Published date: 2003
Keywords:
ultramarine, potassium, shade control, ion exchange
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Local EPrints ID: 19911
URI: http://eprints.soton.ac.uk/id/eprint/19911
PURE UUID: 633dddbd-156d-4ee5-9a8c-d7a44d264d59
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Date deposited: 23 Feb 2006
Last modified: 15 Mar 2024 06:20
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Author:
D.G. Booth
Author:
S.E. Dann
Author:
M.T. Weller
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