Industrial Inorganic Pigments

Buxbaum, Gunter; Pfaff, Gerhard

doi:10.1002/3527603735

Cited by 178 publications

(12 citation statements)

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“…It is evident from the peaks of the diffraction pattern appears at 2θ (33.1). The chroma of the synthesized pigment is also directly proportional to its particle size, indicating that as the particle size gets smaller, it exudes a higher level of lightness and purity (Buxbaum, 2005). The higher the crystallinity level, the brighter the hematite color and the higher the color values have the smaller particle size.…”

Section: Characterization With Color Readermentioning

confidence: 99%

Structure and Morphology Properties of Nanoparticle Hematite Pigment from Lathe Waste

Khoiroh¹,

Sholekah²,

Yulianti³

2021

IJC

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Hematite coated PEG was synthesized by the sonication-calcination method. A variation of Na2CO3 is investigated to know the effect on structure and morphology. Characterization of samples are using X-ray fluorescence, X-ray diffraction, Scanning electron microscopy, and color reader techniques. XRF data showed that iron is the highest element in the precursor. The X-ray diffraction data confirm that Fe(OH)3, α-FeOOH, and Fe3O4 established at the sonication stage are then transformed into the α-Fe2O3 phase after calcination. The X-ray diffraction data also was found that α-Fe2O3 at 0.5 M formed with the highest crystallinity degree. The scanning electron microscopy showed that the particle's shape is spherical, bar-shaped, and aggregate. However, the distribution of particles is not uniform and still displays agglomeration. The Color reader shows the highest degree of lightness obtained is at 1 M variation.

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Section: Characterization With Color Readermentioning

confidence: 99%

Structure and Morphology Properties of Nanoparticle Hematite Pigment from Lathe Waste

Khoiroh¹,

Sholekah²,

Yulianti³

2021

IJC

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“…They are important inputs in several segments, such as in those used in construction, ceramics, and paint, and have been used since ancient times because of their chemical stability, non-toxicity, and cost benefit. Different colours can be obtained including yellow, orange, red, brown, and black [11] [12] [13] [14] [15]. These pigments can be natural or synthetic.…”

Section: Introductionmentioning

confidence: 99%

Hydrometallurgical Processing of Brazilian Iron Ore Tailings for the Synthesis of Pigments

Almeida¹,

Schneider²

2022

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The aim of this study was to investigate the synthesis of iron oxide pigments from IOT. The sample of IOT was obtained through mining activity of the Quadrilátero Ferrífero in the state of Minas Gerais, Brazil. The procedure was carried out by hot acid leaching with hydrochloric acid (HCl) which allowed the recovery of about 95% of the iron in a liquor. The iron-based pigmentsred (IBP_R), black (IBP_B), and yellow (IBP_Y)-were synthetised from the liquor by selective precipitation, crystallisation, and thermal procedures. The pigments were characterised by particle size distribution, mineral and chemical compositions, as well as colourimetric properties. The process of synthesis was successful and the procedure was shown to maximise the utilisation of mineral resources and minimise the environmental, social, and economic impacts associated with IOT disposal.

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“…They are classified into pearlescent pigments, which mainly exhibit hue and chroma shifts, and metallic pigments, which show lightness variations. Moreover, the goniochromatic particles inside the pigment can generate specific spatial distributions that create additional optical effects dependent also upon the angular configuration [5,6].…”

Section: Introductionmentioning

confidence: 99%

Texture Evaluation of Automotive Coatings by Means of a Gonio-Hyperspectral Imaging System Based on Light-Emitting Diodes

et al. 2020

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Sparkle and graininess are textural effects that appear as intrinsic spatial features of coatings containing goniochromatic pigments, whereas others such as mottling are undesired outcomes. In this study, we present new methods for the evaluation of sparkle, graininess and mottling of automotive coatings through images acquired with a novel gonio-hyperspectral imaging system based on light-emitting diodes with extended spectral sensitivity beyond the visible range (368–1309 nm). A novel analysis of sparkle that considered the amount of sparkling spots was used. Graininess was quantified through a novel statistical descriptor based on the energy descriptor computed from the histogram. A new index was proposed for an enhanced detection of mottling based on the analysis of striping, which was better observed and quantified in the infrared range. Spectral assessments showed a strong relationship with color and spectral reflectance for graininess and mottling. In conclusion, the results showed that these new spatial and spectral methods are a suitable, alternative and potential approach for the assessment of these textural features.

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Industrial Inorganic Pigments

Cited by 178 publications

References 0 publications

Structure and Morphology Properties of Nanoparticle Hematite Pigment from Lathe Waste

Structure and Morphology Properties of Nanoparticle Hematite Pigment from Lathe Waste

Hydrometallurgical Processing of Brazilian Iron Ore Tailings for the Synthesis of Pigments

Texture Evaluation of Automotive Coatings by Means of a Gonio-Hyperspectral Imaging System Based on Light-Emitting Diodes

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