The encapsulation efficiency of zircon pigments from robust solids to clear solutions
Abstract
Purpose
This paper aims to systematically demonstrate a methodology to determine the relative and absolute encapsulation efficiencies (αRe and αAb) for thermally- and chemically-robust inorganic pigments, typically like ZrSiO4-based pigments, thereby enhancing their coloring performance.
Design/methodology/approach
The authors designed a route, surplus alkali-decomposition and subsequently strong-acid dissolution (SAD2) to completely decompose three classic zircon pigments (Pr–ZrSiO4, Fe2O3@ZrSiO4 and CdS@ZrSiO4) into clear solutions and preferably used inductively coupled plasma-optical emission spectrometry (ICP-OES) to determine the concentrations of host elements and chromophores, thereby deriving the numeric data and interrelation of αRe and αAb.
Findings
Zircon pigments can be thoroughly decomposed into some dissoluble zirconate–silicate resultants by SAD2 at a ratio of the fluxing agent to pigment over 6. ICP-OES is proved more suitable than some other quantification techniques in deriving the compositional concentrations, thereby the values of αRe and αAb, and their transformation coefficient KRA, which maintains stably within 0.8–0.9 in Fe2O3@ZrSiO4 and CdS@ZrSiO4 and is slightly reduced to 0.67–0.85 in Pr–ZrSiO4.
Practical implications
The SAD2 method and encapsulation efficiencies are well applicable for both zircon pigments and the other pigmental or non-pigmental inhomogeneous systems in characterizing their accurate composition.
Originality/value
The authors herein first proposed strict definitions for the relative and absolute encapsulation efficiencies for inorganic pigments, developed a relatively stringent methodology to determine their accurate values and interrelation.
Keywords
Acknowledgements
The authors work is financially supported by the National Natural Science Foundation of China (No. 51602096, 12174092, 11874144, 21801071), China Postdoctoral Science Foundation (2020M682382), Hubei Provincial Department of Science and Technology (2018CFA026, 2019CFA079), Wuhan Science and Technology Bureau (No. 2018010401011268), and the Program of Introducing Talents of Discipline to Universities (“111 Project”, D18025). S. Peng and R. Yang contributed equally to this work.
Citation
Peng, S., Yang, R., Lei, B., Gao, Y., Chen, R., Xia, X. and Homewood, K.P. (2023), "The encapsulation efficiency of zircon pigments from robust solids to clear solutions", Pigment & Resin Technology, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/PRT-12-2022-0147
Publisher
:Emerald Publishing Limited
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