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Inorganic-organic hybrid pigments based on carminic acid and clay minerals

Abstract : Hybrid pigments based on carminic acid (CA) stabilized by clay minerals have been prepared. Three different pathways were used: CA@saponite; CA@Al-pillared saponite; and hydrogels of saponite-CA or montmorillonite-CA covered by polyorganosilane (POS). Pigments were characterized by a set of different techniques including X-Ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy (FTIR), solid state nuclear magnetic resonance (NMR) and time-resolved fluorescence (TRF) spectroscopies. The color parameters, i.e., L*a*b*, were measured. In addition, the photostability of the samples under visible light was evaluated. The results showed that CA@PilSap presented a greater stability compared to CA@Saponite. The pigments obtained from hydrogels presented the greatest light stability due to the coverage with POS that acts as a protective layer.
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Submitted on : Wednesday, May 26, 2021 - 11:22:06 AM
Last modification on : Tuesday, January 4, 2022 - 6:00:41 AM
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Graycyellê R.S. Cavalcanti, Francisco Rodrigues, Guanzheng Zhuang, Sebastien Balme, Jean-Marc Janot, et al.. Inorganic-organic hybrid pigments based on carminic acid and clay minerals. Dyes and Pigments, Elsevier, 2021, 190, pp.109306. ⟨10.1016/j.dyepig.2021.109306⟩. ⟨hal-03236376⟩



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