Green colored nano-pigments derived from Y2BaCuO5: NIR reflective coatings

Jose, Sheethu; Prakash, Aiswaria; Laha, Sourav; Natarajan, Srinivasan; Reddy, M. L. P.

doi:10.1016/j.dyepig.2014.03.025

Cited by 91 publications

(19 citation statements)

References 23 publications

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“…The value of wavelength, λ (in nm) corresponding to the absorption edge is substituted in the formula, E g (in eV)¼1239.8/λ. Near-infrared diffuse reflectance (NIR) of the AZO nano-pigment as well as AZO/PMMA nanocomposite coatings on glass substrate was measured using UV-vis-NIR spectrophotometer (Shimadzu, UV-3600) with an integrating sphere attachment, ISR-3100 using poly (tetraflouroethylene) (PTFE) reference as reported in earlier work [22,33,34]. The NIR reflectance measurements of the samples were performed in the wavelength 700 to 2500 nm range.…”

Section: Optical Measurementsmentioning

confidence: 99%

Enhanced near-infrared reflectance and functional characteristics of Al-doped ZnO nano-pigments embedded PMMA coatings

Soumya

Mohamed

Mohan

et al. 2015

Solar Energy Materials and Solar Cells

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Section: Optical Measurementsmentioning

confidence: 99%

Enhanced near-infrared reflectance and functional characteristics of Al-doped ZnO nano-pigments embedded PMMA coatings

Soumya

Mohamed

Mohan

et al. 2015

Solar Energy Materials and Solar Cells

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“…A [36]. Este valor também pode ser utilizado como indicativo qualitativo da estabilidade e durabilidade do pigmento [34,[37][38][39]. ΔE* ab = ΔL 2 + Δa 2 + Δb 2 (A)…”

Section: Introductionunclassified

Síntese de pigmentos de níquel utilizando areia descartada de fundição como fonte de sílica

2019

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Resumo Sintetizaram-se pigmentos do sistema Zn2-xNixSiO4 variando a proporção molar de zinco e níquel, partindo da estrutura willemita (Zn2SiO4) à olivina (Ni2SiO4), usando areia descartada de fundição (ADF) e sílica comercial como fontes de SiO2. A ADF foi caracterizada por análise química e DRX. A síntese dos pigmentos seguiu rota cerâmica, com x = 0, 0,5, 1, 1,5 e 2,0 mol e calcinação a 1200 °C. Os pigmentos foram caracterizados mediante DRX e medidas colorimétricas. Os resultados mostraram que, apesar da presença de alumina e ferro na ADF, as fases cristalinas e cor dos pigmentos foram similares para ambas as fontes de sílica. Teores menores de níquel favoreceram a formação de willemita e maiores a de olivina. Todos os pigmentos (com e sem ADF) dispersos em dois esmaltes e queimados em forno semi-industrial desenvolveram coloração marrom, indicando instabilidade destes nas matrizes usadas, mas confirmando a viabilidade de substituição da sílica comercial por ADF.

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“…The coordination geometry around the copper ions is a distorted square-pyramid form. As a result, spin-allowed d-d transitions of Cu 2+ are available, and a part of the visible light was absorbed by these transitions to give green color 5,6) .Generally, the d-d transitions are strongly affected by the steric structure of the component unit, and the transition probability usually increases when the coordination geometry around the transition metal ions is highly asymmetric. The crystal field effect to split the d orbitals depends on the length between Cu 2+ and O 2− in Y 2 BaCuO 5 .…”

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Novel Environment-friendly Green Pigments for Over-glazed Decoration of <i>Arita</i> Ware

Masui

Shiraishi²,

Nakado

et al. 2015

Journal of the Japan Society of Colour Material

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Inorganic green pigments are typically applied to ceramic tiles, inks, and paints. Chrome oxide green (Cr 2 O 3 ) and cobalt green (CoO•ZnO) have been known as conventional materials 1) , but they have serious problems from a practical viewpoint. They are less than perfect in green color, and, in particular, Cr 2 O 3 is of concern due to the toxicity of Cr which has adverse effects on the human body and the environment.In this study, we focused on Y 2 BaCuO 5 as an environmentally friendly green pigment. This compound adopts an orthorhombic structure (space group: Pbnm), which are composed of CuO 5 , Y 2 O 11 , and BaO 11 polyhedra [2][3][4][5] . The coordination geometry around the copper ions is a distorted square-pyramid form. As a result, spin-allowed d-d transitions of Cu 2+ are available, and a part of the visible light was absorbed by these transitions to give green color 5,6) .Generally, the d-d transitions are strongly affected by the steric structure of the component unit, and the transition probability usually increases when the coordination geometry around the transition metal ions is highly asymmetric. The crystal field effect to split the d orbitals depends on the length between Cu 2+ and O 2− in Y 2 BaCuO 5 . Accordingly, it should be possible to control the light absorption strength and wavelength by modifying the CuO 5 polyhedra: it can be expected that the green color becomes more vivid by doping another ion into the Y 2 BaCuO 5 lattice to cause a conformational change of the CuO 5 polyhedra.In this study, therefore, novel green pigments based on (Y 0.9 R 0.1 ) 2 BaCuO 5 (R = Sm 3+ , Gd 3+ , Yb 3+ , and Lu 3+ ) solid solutions were synthesized and the composition was optimized for the sample that showed the most vivid green color. In response to the results, furthermore, the potential of the (Y 0.9 Lu 0.1 ) 2 BaCuO 5 and Y 2 BaCuO 5 pigments were evaluated as a new environmentally friendly green pigment for Arita ware. Abstract Environmental-friendly inorganic green pigments based on (Y 0.9 R 0.1 ) 2 BaCuO 5 (R = Sm 3+ , Gd 3+ , Yb 3+ , and Lu 3+ ) solid solutions were synthesized and the dopant element was optimized to give the most greenish color. Among the samples, it was found that Lu-doped sample showed brilliant green hue. In response to the results, (Y 1−x Lu x ) 2 BaCuO 5 (0 ≤ x ≤ 0.3) pigments were further synthesized and their color properties were characterized in an attempt to find a new environmentally friendly pigment that has more sufficient green chromaticity. Among the samples, the most vivid green hue was obtained for (Y 0.9 Lu 0.1 ) 2 BaCuO 5 with a greenness value (−a*) of 48.6 in the CIE L*a*b* system, which was significantly larger than those of commercially available Cr 2 O 3 (−a* = 18.2) and CoO•ZnO (−a* = 25.3) pigments. The Y 2 BaCuO 5 and (Y 0.9 Lu 0.1 ) 2 BaCuO 5 pigments were used in paints for porcelain. The green colors of the overglazed decoration panels were brilliant. Therefore, these pigments could be the potential candidates for novel green pigments of over-...

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Green colored nano-pigments derived from Y2BaCuO5: NIR reflective coatings

Cited by 91 publications

References 23 publications

Enhanced near-infrared reflectance and functional characteristics of Al-doped ZnO nano-pigments embedded PMMA coatings

Enhanced near-infrared reflectance and functional characteristics of Al-doped ZnO nano-pigments embedded PMMA coatings

Síntese de pigmentos de níquel utilizando areia descartada de fundição como fonte de sílica

Novel Environment-friendly Green Pigments for Over-glazed Decoration of <i>Arita</i> Ware

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