Recent advances in infrared reflective inorganic pigments

Jose, Sheethu; Joshy, Deepak; Narendranath, Soumya B.; Periyat, Pradeepan

doi:10.1016/j.solmat.2019.01.037

Cited by 133 publications

(62 citation statements)

References 161 publications

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“…Since zircon as a distinct ternary metal oxide has acquired many established applications as stated in the introduction, the MSZ zircons will be particularly attractive in some emerging areas such as biomedical compatible materials and catalyst supports, etc . Meanwhile, considering the finer sizes (against 3‐20 μm in common zircons 21‐24 ) and low specific areas, the MSZ zircons will also be of special interest in the synthesis of advanced ink‐jet zircon pigments, such as blue V‐ZrSiO 4 , yellow Pr‐ZrSiO 4 , and pink Fe‐ZrSiO 4 23,24,54,55 . These investigations will be anticipated in future work.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, considering the finer sizes (against 3-20 μm in common zircons [21][22][23][24] ) and low specific areas, the MSZ zircons will also be of special interest in the synthesis of advanced ink-jet zircon pigments, such as blue V-ZrSiO 4 , yellow Pr-ZrSiO 4 , and pink Fe-ZrSiO 4 . 23,24,54,55 These investigations will be anticipated in future work.…”

Section: Preliminary Exploration For Msz Applicationsmentioning

confidence: 93%

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Effect of halide mineralizers on monodisperse spherical zircon powders

et al. 2021

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Zircon has been widely applied in various traditional and emerging fields due to its distinct physiochemical advantages while monodisperse spherical zircon (MSZ) powders hitherto have not been explored for the tremendous challenges in the control of zircon crystallization and growth. Herein, systematic investigations are presented to reveal the paramount role of halide mineralizers upon the crystallization and growth of MSZ powders synthesized under highly acidic hydrothermal environments (pH <0). A formation mechanism is revealed revolving around the complexation of central Zr4+ with the Lewis basic ligand, fluorine, which forms the F‐containing species of [(OH)1–y·Ry] (R = F, Cl) to replace Zr and generates Zr‐deficient zircons as (ZrO4)1‐xSi[(OH)1‐y·Ry]4x. This finding differs much from conventional views on common fluoro‐hydroxylated hydrothermal zircons, which were generally regarded as Si‐deficient silicates from the substitution of fluoro‐hydroxyls for the [SiO4] tetrahedra. A parameter, Kr=4xy, is first proposed as an index to evaluate the stability of hydrothermal zircons. The MSZ powders demonstrate superb thermal stability at high temperature, superior photo‐reflectance, and thermal insulation over normal zircons, promising attractive prospects to extend zircon applications.

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Section: Resultsmentioning

confidence: 99%

Section: Preliminary Exploration For Msz Applicationsmentioning

confidence: 93%

Effect of halide mineralizers on monodisperse spherical zircon powders

et al. 2021

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“…The CIE L * a * b * system is widely used to evaluate the color difference of pigments. 33 The color difference in the CIELAB space is given by In eq 1 , Δ E * is the total color change, Δ L , Δ a , and Δ b are the change of the color lightness ( L *), position between red and green ( a *), and position between yellow and blue ( b *), respectively. The smaller the value of Δ E , the less color difference between treated and untreated pigment samples.…”

Section: Results and Discussionmentioning

confidence: 99%

Facile and Scalable Conservation of Chinese Ancient Paintings Using Water-Borne Fluoropolymer

Wang

Xing

et al. 2020

ACS Omega

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In China, alum-gelatin aqueous solution is historically used to prevent falling off of mineral pigments from paintings and to enhance strength of their paper matrices in the restoration process. However, after a long period of time of preservation, alum-gelatin aqueous solution applied to paintings will hydrolyze and produce free acid, which accelerates aging. To resolve this issue, instead of using alum-gelatin aqueous solution, here we report a new method of using a water-borne fluoropolymer coating to protect paintings. This coating is applied to simulated paintings, and their influences are systematically examined on the antipeeling property of pigment, mechanical properties, thermal stability, chromaticity, surface morphology, and water contact angle. Our results show that the applied coating slightly affects the appearance of the painting without falling off of pigment observed. Moreover, the coating increases the tensile strength and folding endurance of the paper because the polymer fills into the porous structure of paper fibers and covers pigment particles from SEM analysis. The treated painting retains moderate hydrophilicity, which facilitates removal of degradation substances from the paintings by water cleaning and the subsequent mounting procedure. Moreover, this coating is successfully applied to repairing a set of real ancient Chinese paintings of Yuan Dynasty (1271∼1368 A.D.), with practical acceptance. Our work provides a facile yet effective solution to conservation of ancient paintings by applying the modern fluoropolymers.

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“…Another type of spinel pigment is the B[AB]O 4 spinel system. Known as “inverse spinels”, the A represents metal ions situated in octahedral structures, whereas B ions appear in tetrahedral and octahedral sites [ 10 ]. Spinel pigments have found widespread applications as catalysts, semiconductors, and magnetic ceramic powders.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Effect of Spinel Pigments on the Photostability and Combustion Properties of Ethylene-Norbornene Copolymer

et al. 2021

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Multicolor ethylene-norbornene (EN) composites filled with three different spinel pigments (Cobalt Green-PG50, Zinc Iron Yellow-PY 119, Praseodym Yellow-PY159) were prepared by melt mixing and characterized in terms of their stability under destructive environmental conditions. The EN films were subjected to accelerated aging by ultraviolet (UV) photooxidation for 300 h, 600 h, or 900 h. The mechanical performance of the EN composites was investigated in static and dynamic mechanical tests. The morphologies of the EN samples and their color changes during the aging process were evaluated by scanning electron microscopy (SEM) and spectrophotometric measurements. Fourier transform infrared (FTIR) spectroscopy was applied to determine the amount of carbonyl groups resulting from surface oxidation at different aging times. The effects of the spinel pigments on the thermal stability and combustion properties of the multicolor polymer composites were also assessed, and compared with a sample containing the organic Pigment Yellow 139 (PY139). The results show that the color changes (ΔE) in the spinel pigments were minor in comparison to those in the organic pigment (PY139) and the reference film. The Zinc Yellow (PY119) pigment was the most effective stabilizer of EN copolymer. Moreover, the spinel pigments had a positive effect on the flame retardancy of the EN composites. Microcombustion tests (MCC) showed that the incorporation of both the spinels and the organic pigment PY139 into the EN matrix reduced the heat release rate (HRR) and total heat release (THR) parameters.

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Recent advances in infrared reflective inorganic pigments

Cited by 133 publications

References 161 publications

Effect of halide mineralizers on monodisperse spherical zircon powders

Effect of halide mineralizers on monodisperse spherical zircon powders

Facile and Scalable Conservation of Chinese Ancient Paintings Using Water-Borne Fluoropolymer

Investigation into the Effect of Spinel Pigments on the Photostability and Combustion Properties of Ethylene-Norbornene Copolymer

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