Preparation and properties of SiO2 wrapped γ-(CeLa)2S3 orange-red pigment by Stober method

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society Pub Date : 2025-08-30 DOI:10.1016/j.jics.2025.102057

Sirui Cheng , Yueming Li , Kai Li , Fusheng Song , Yi Sun , Cheng Zhang , Dawei Yang

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Abstract

γ-(CeLa)₂S₃ is a newly developed rare earth inorganic orange-red pigment characterized by non-toxicity, bright coloration, and high weather resistance, though its thermal stability is limited to 350 °C. The Stober method provides an effective approach for enhancing its thermal resistance by applying a high-temperature-resistant coating to the pigment surface. In this study, commercially available orange-red γ-(CeLa)₂S₃ pigment was selected for investigation. The influence of solid content on the coating performance was examined, using CTAB as the dispersing agent, TEOS as the silicon source, anhydrous ethanol and pure water as co-solvents, and NH₃·H₂O to adjust the solution pH. Results indicate that when the solid content reaches 100 g, and the ethanol-water ratio and total volume remain constant, the coated pigment demonstrates superior thermal and acid resistance. The pigment retains its orange-red color (L∗ = 45.40, a∗ = 35.21, b∗ = 47.80) after being calcined at 450 °C and exhibits no significant color alteration following 12 h immersion in 1.0 M hydrochloric acid.

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Stober法制备SiO2包覆γ-(CeLa)2S3橙红色颜料及其性能

γ-(CeLa)2S3是一种新开发的稀土无机橙红色颜料，具有无毒、色泽鲜艳、耐候性高等特点，但其热稳定性限制在350℃。Stober方法提供了一种有效的方法，通过在颜料表面应用耐高温涂层来增强其耐热性。本研究选择市售的橙红色γ-(CeLa)2S3色素作为研究对象。以CTAB为分散剂，TEOS为硅源，无水乙醇和纯水为共溶剂，NH3·H2O调节溶液ph，考察了固含量对涂层性能的影响。结果表明，当固含量达到100 g时，在保持乙醇-水比和总体积不变的情况下，涂层颜料表现出优异的耐热性和耐酸性。颜料经450℃煅烧后仍保持橘红色（L∗= 45.40,a∗= 35.21,b∗= 47.80），在1.0 M盐酸中浸泡12 h后颜色无明显变化。

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来源期刊

Journal of the Indian Chemical Society 化学-化学综合

CiteScore

3.50

自引率

7.70%

发文量

492

审稿时长

3-8 weeks

期刊介绍： The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.