Precursor content assessment and its influence on the optical interference of a nano-sized mica-hematite pearlescent pigment

Tohidifar, Mohammad Reza; Taheri-Nassaj, E.; Alizadeh, Parvin

doi:10.1016/j.powtec.2010.07.021

Cited by 14 publications

(4 citation statements)

References 10 publications

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“…Generally, the pearl pigments have a two-dimensional substrate such as the mica flake with a low refractive index and TiO 2 as a coating layer with a high refractive index. The pearl pigments are mainly used as a security material with gloss properties due to their unique sparkling and color change [18][19][20]. These materials are expected to be used as next-generation anticounterfeiting pigments [12,18].…”

Section: Introductionmentioning

confidence: 99%

Y2O3:Eu3+ Nanophosphor-Coated Mica or TiO2/Mica as Red-Emitting Pearl Pigment: Coating Factors, Luminescent and Gloss Properties

et al. 2021

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Red-emitted Y2O3:Eu3+ nanophosphor coated on a mica flake (Y2O3:Eu@MF) or on TiO2 having a rutile crystalline mica flake (Y2O3:Eu@TMF) has been prepared by an electrostatic interaction with the wet-coating method for the purpose of a pigment with luminescent and gloss properties. Aggregated Y2O3:Eu3+, prepared by the template method, was dispersed into nanosol by a controlled bead-mill wet process. The (+) charged Y2O3:Eu3+ nanosol was effectively coated on the (-) charged mica flake (MF) or the TiO2/mica flake (TMF) by an electrostatic interaction between the Y2O3:Eu3+ nanoparticles and MF or TMF at pH 6–8. The coating factors of Y2O3:Eu@MF were also studied and optimized by controlling the pH, stirring temperature, calcination temperature, and coating amount of Y2O3:Eu3+. The Y2O3:Eu3+ was partially coated and optimized on the MF or TMF surface with a coating coverage of about 40–50% or 60–70%, respectively. Y2O3:Eu@MF and Y2O3:Eu@TMF were exhibiting the luminescent property of a red color under a 254 nm wavelength, and had a color purity of over 95% according to CIE chromaticity coordinates. These materials were characterized by X-ray diffraction, FE-SEM, zeta potential, and a fluorescence spectrometer. These materials with luminescent and gloss properties prepared in this work potentially meet their applications for security purposes.

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Section: Introductionmentioning

confidence: 99%

Y2O3:Eu3+ Nanophosphor-Coated Mica or TiO2/Mica as Red-Emitting Pearl Pigment: Coating Factors, Luminescent and Gloss Properties

et al. 2021

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“…Recently, metal-oxide coatings on the substrate material, also called the substrate-based inorganic pigment, have attracted great attention and due to a wide range of applications in the optical filters, cosmetics, plastics and paint industries. Metal-oxide must be perfectly and uniformly coated on the mica surface to obtain a highly pearlescent pigment for use in substrate-based inorganic pigment [14][15][16][17][18][19]. Mica-TiO 2 coating is most widely used to obtain the pearlescent pigment applications.…”

Section: Introductionmentioning

confidence: 99%

Development of Nanosized Mica Particles from Natural Mica by Sonication/Organic Intercalation Method for Pearlescent Pigment

Malayoğlu

Besun²

2020

Minerals

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In this study, the possibility of reducing natural mica particles to nanosizes without damaging its surface properties and smooth flake shape for pearlescent pigment application was investigated by using the sonication delamination method. For this purpose, the layer charge density of the natural mica mineral was reduced using surfactant intercalation followed by maximum exfoliation of mica interlayers with the help of sonication. Therefore, the delamination was achieved in a simple and more energy-efficient way by the sonication process and, in turn, the dimensions of mica were reduced to nanoscale with smooth surface features. With this new delamination process, the lowest particle thickness values were obtained as 0.061 microns after only 1 h sonication period. The results were found to be much significant when compared to the literature. Furthermore, the unique pearlescent pigment properties of mica particles were attributed to the characteristic shape and nanosized mica, which are coated with TiO2.

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“…There are significant advantages from the use of special-effect pigments in decorative applications such as the illusion of optical depth, the ability to imitate the effect of natural appearance, or even to change color depending on the viewing angle [5]. Some of the main types of special-effect pigments include metaleffect pigments [6], optical interference-effect pigments [7], fluorescent pigments [8], and luminous pigments [9].…”

Section: Introductionmentioning

confidence: 99%

Correlating Coating Quality of Coverage with Rheology for Mica-Based Paints

et al. 2020

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This paper examines the relationship between rheology and the qualitative appearance of dried, mica-based paint coatings used in the aerospace industry. The goal is to identify key rheological characteristics indicative of poor coating visual appearance, providing a screening tool to identify unsatisfactory paint formulations. Four mica paints were studied, having coating visual appearances ranging from very poor to very good. Strain sweeps indicated that the poor-quality paints have a smaller % strain midpoint in the linear visco-elastic range; while the good-quality paints have a lower G’/G” cross-over point in frequency sweeps. Thixotropy experiments utilizing single and multiple-loop hysteresis cycles plotting shear stress as a function of shear rate showed that the base mica paints with good appearance had nearly constant, reversible profiles in the forward and the backward directions; while the mica paints with poor appearance were irreversible with a noticeable gradual change in shear stress as more loops are run. The difference in area between the forward and the reverse curves was determined, leading to a quantifiable criterion that can differentiate good paints from poor paints with significance testing. This work would establish the first rheology model using hysteresis loops to predict the visual properties of mica-based paints.

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Precursor content assessment and its influence on the optical interference of a nano-sized mica-hematite pearlescent pigment

Cited by 14 publications

References 10 publications

Y2O3:Eu3+ Nanophosphor-Coated Mica or TiO2/Mica as Red-Emitting Pearl Pigment: Coating Factors, Luminescent and Gloss Properties

Y2O3:Eu3+ Nanophosphor-Coated Mica or TiO2/Mica as Red-Emitting Pearl Pigment: Coating Factors, Luminescent and Gloss Properties

Development of Nanosized Mica Particles from Natural Mica by Sonication/Organic Intercalation Method for Pearlescent Pigment

Correlating Coating Quality of Coverage with Rheology for Mica-Based Paints

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