Synthesis and color properties of the TiO2@CoAl2O4 blue pigments with low cobalt content applied in ceramic glaze

He, Xiangming; Wang, Fen; Liu, Hui; Niu, Lijun; Wang, Xinzhen

doi:10.1111/jace.15422

Cited by 45 publications

(14 citation statements)

References 52 publications

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“…In contrast, an increase in the proportion of cobalt aluminate caused an increase in C * because cobalt aluminate has an intense blue color. In addition, the cobalt blue color is attributed to 4 A 2 (F)→ 4 T 1 (P) of the d–d transition of the tetrahedrally coordinated Co 2+ ion . The band gap of the synthesized cobalt blue becomes uniform and the absorption wavelength becomes constant with increasing crystalline size, and C * increases.…”

Section: Resultsmentioning

confidence: 93%

“…However, cobalt is scarce and expensive, therefore the production costs of cobalt‐based ceramic pigments are high. In addition, the manufacture of cobalt‐based ceramic pigments can cause serious environmental problems …”

Section: Introductionmentioning

confidence: 99%

“…Zheng et al prepared blue TiO 2 /CoAl 2 O 4 complex pigments through calcination of precursors obtained by precipitation of Al 3+ and Co 2+ on TiO 2 particles. He et al synthesized the TiO 2 /CoAl 2 O 4 complex pigments through calcinations of precursors obtained from coprecipitating Co 2+ and Al 3+ to form Co‐Al‐layered double hydroxides on the surface of TiO 2 particles. Ahmed et al prepared Zn·Co aluminate/kaolin core‐shell pigments by impregnating kaolin with a cobalt and zinc acetate solution.…”

Section: Introductionmentioning

confidence: 99%

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Solid‐state synthesis and characterization of cobalt blue core‐shell pigment particles

et al. 2018

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Cobalt blue is one of the most chemically and thermally stable blue pigments. However, cobalt is scarce and expensive. To minimize the use of cobalt and reduce production costs and toxicity, cobalt blue core‐shell pigments were synthesized by a solid‐state method, which is cheaper than a liquid‐phase reaction. Small cobalt hydroxide particles and large α‐alumina particles, in various ratios, were used as the starting materials. The dry mixed powders were calcined at 1200°C for 2 hours. Elemental mappings of the surfaces and cross sections of the synthesized particles showed that the cobalt blue had a core‐shell structure. X‐ray diffraction patterns showed that the synthesized cobalt blue consisted of an α‐alumina core and a cobalt aluminate shell. The color tone of the synthesized cobalt blue was evaluated from the lightness (L*) and chroma (C*) values. The color tone of the cobalt blue synthesized in this study was almost same as those of commercially available samples although the cobalt molar fraction was lower than the stoichiometric ratio (Co/(Co + Al) = 0.33, Co/Al = 0.5) which was calculated from the chemical reaction formula.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solid‐state synthesis and characterization of cobalt blue core‐shell pigment particles

et al. 2018

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“…When combined with other metals, a softer pearly effect can be produced. Other alternative techniques may generate effects in ceramics that resemble iridescence and pearling, such as the use of titanium and cobalt (TiO 2 @CoAl 2 O 4 ) [41] for bright colours [42], zirconium pigments encapsulated with deep black colours [43], or zinc oxide-based iridescent metallic effect surfaces (ZnO) [44]. Some recent research has shown iridescent and pearl effects based on enamels containing zinc oxide, zirconium oxide, itrio oxide, titanium oxide, hafnium oxide and cerium oxide [45].…”

Section: Iridescent and Pearl Techniquesmentioning

confidence: 99%

Gloss, Light Reflection and Iridescence in Ceramic Tile Enamels Containing ZrO2 and ZnO

Iribarren

Rizo-Maestre

2020

Coatings

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Ceramic claddings on building facades not only present functional qualities and good resistance; they also add value to the architecture due to their qualities of light reflection, gloss and iridescence. The colour ranges produced by some enamel application techniques can vary widely. They change depending on one’s angle of vision and movement, colours in the surroundings, sunlight and their angle of incidence. In addition, the iridescent-pearl effect produced by light diffraction can lead to beautiful goniochromatic colours. This study analyses the production of square tiles of stoneware manufactured by extrusion, and their application to the Faculty of Education of the University of Alicante (FEUA) (Spain). Applying an enamel containing zirconium silicate ZrSiO4 and other metals such as Zn and Al produces iridescence-like effects. The physical-chemical properties of enamel and gloss values were characterised. A colorimetric characterisation was conducted by evaluating goniochromatic or iridescent colours, measuring the light’s spectral radiance factor, and comparing these results with other ceramic tiles of marked iridescent effects, with the presence of a final layer of anatase TiO2 enamel.

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“…However, merely blending inorganic particles to polymer matrix could not meet all the requirements. [ 15–17 ] Therefore, the new designing of microstructure of nanocomposites, containing the construction of multilayer and the arrangement of nanofillers, has been attracting much attention by researchers. [ 18–20 ] The electrical and mechanical properties of composites can be greatly improved by changing the dimension of nanofillers and making them have a certain orientation in polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Polyimide‐Based Composite Film Synergistically Modulated via a Nano–Micro Multidimensional Filler System toward Insulation Flexible Device Applications

Zhao

Yin

Liu

et al. 2021

Macro Chemistry & Physics

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Excellent overall performance, including high breakdown strength, brilliant flexibility, and fine mechanical properties, are hard to achieve simultaneously in polymer‐based composites. It is a challenge to improve the electrical properties of the polyimide (PI)‐based composites and to restrain the degradation of mechanical properties even at high doping content. Herein, PI/boron nitride nanosheets (BNNs)‐titanate nanotubes (TNs) ternary composite films are designed via interfacial construction of BNNs‐induced partial orientation TNs with uniform dispersion process, achieving high breakdown strength (175.3 kV mm–1), excellent tensile strength (163 MPa), large elongation at break (67%), and outstanding storage modulus (3023 MPa). Micro‐sized one‐dimensional TNs and nano‐sized two‐dimensional BNNs form a spatial network structure through hydrogen bonding, which can significantly inhibit the degradation of the mechanical and electrical properties of the composites. The orientation of TNs induced by BNNs and interface behavior between nanofillers and PI matrix are investigated and theoretical analysis using the finite element simulation is carried out to demonstrate the influence of BNNs on the electrical performance of the composites. This work can shed light for designing of high insulation and superior mechanical strength functional materials.

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Synthesis and color properties of the TiO₂@CoAl₂O₄ blue pigments with low cobalt content applied in ceramic glaze

Cited by 45 publications

References 52 publications

Solid‐state synthesis and characterization of cobalt blue core‐shell pigment particles

Solid‐state synthesis and characterization of cobalt blue core‐shell pigment particles

Gloss, Light Reflection and Iridescence in Ceramic Tile Enamels Containing ZrO2 and ZnO

Polyimide‐Based Composite Film Synergistically Modulated via a Nano–Micro Multidimensional Filler System toward Insulation Flexible Device Applications

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