The preparation and characteristics of surface treated barium sulfate extender pigment

Gupta, Manu; Kamani, P. K.; Shukla, Rajni

doi:10.1007/s11998-012-9433-7

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…According to literature, either NaPb 2 (CO 3 ) 2 OH or KPb 2 (CO 3 ) 2 OH can be responsible for the band observed at 1,057 cm −1 . Raman bands at 462, 617, 647, and 990 cm −1 correspond to barium sulfate, which was employed since the early 19th century as an extender pigment . In fact, the mineral barite was one of the most common adulterants of white lead during the 19th century.…”

Section: Resultsmentioning

confidence: 99%

Romantic restorations in the Alhambra monument: Spectroscopic characterization of decorative plasterwork in the Royal Baths of Comares

Arjonilla

Ayora‐Cañada

Domene³

et al. 2018

J Raman Spectroscopy

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The polychrome plasterwork decorations of the Room of the Beds in the Royal Bath of Comares of the Alhambra monumental ensemble have been studied using Raman microspectroscopy and complementary techniques. This area keeps the testimony of the controversial restorations carried out in the 19th century in an attempt to imitate the lost original appearance of the authentic Nasrid plasterwork. Raman spectroscopy and energy dispersive X-ray fluorescence have been employed to identify the pigments and extenders. Scanning electron microscopy-energy dispersive X-ray spectroscopy has been used to gain additional information about the morphology of the painting layers. Additionally, infrared microspectroscopy provided insight into the nature of the organic materials employed as binders. Vermillion, synthetic ultramarine blue, hematite, and carbon black were clearly identified in red, blue, brown, and black decorations by Raman spectroscopy. Green decorations were executed with a copper-arsenic pigment that could not be unambiguously identified although the presence of Raman bands typical of arsenate stretching bands could point to alteration processes of copper arsenite pigments. Regarding the execution technique, the pictorial layer was applied over a preparation layer of white lead that also contained barite using a proteinaceous binder.The presence of anglesite and other phases related to hydrocerussite alteration due to humidity and salts was also evidenced. Finally, a comparison of the materials found in this redecoration with those identified in original Nasrid decorations has been performed, revealing noticeable differences in both the materials and the execution technologies.

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Section: Resultsmentioning

confidence: 99%

Romantic restorations in the Alhambra monument: Spectroscopic characterization of decorative plasterwork in the Royal Baths of Comares

Arjonilla

Ayora‐Cañada

Domene³

et al. 2018

J Raman Spectroscopy

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“…Insoluble pigments should be ground and added to water, resin, mineral spirits, and other media, and then applied with a brush to the surface of the object to be dyed to form a covering layer, such as paint on the surface of furniture or latex paint on the wall. Inorganic pigments are generally minerals and belong to the category of insoluble pigments 4,5 …”

Section: Introductionmentioning

confidence: 99%

Study on silica coated chrome oxide green pigment and its performance

Wang

Bao

Yan

et al. 2020

J of Applied Polymer Sci

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In this study, sodium silicate (Na2SiO3) was used as the precursor of SiO2 to prepare Cr2O3/SiO2 composite pigments. First, using cetyltrimethylammonium bromide to surface modification of the chromium oxide green pigment to make the surface of the particles positively charged. The negatively charged SiO2 sol coats the surface of the pigment particles through electrostatic attraction. Then use HCl solution acid to precipitate SiO2, and finally get Cr2O3/SiO2 composite pigment. The structure of the modified pigment was analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle size distribution analysis, and X‐ray diffraction (XRD) characterization. The influence of silica coating on the tinting strength, dispersibility of pigment in water, and hiding power of the chromium oxide green pigment were further investigated. The results demonstrate that SEM, TEM, and particle size analysis shows that this experimental method can obtain a good silica coating. When the coating quantity is 30%, the full coating of chromium oxide green by silica is achieved. According to the XRD analysis before and after the chromium oxide green coating, as the reaction temperature increases, the intensity of the SiO2 diffraction peak becomes larger and the crystallization effect becomes better. In the test of pigment performance, it can be concluded that the coloring power, hiding power, and dispersibility of Cr2O3/SiO2 composite pigments are better than those of uncoated chromium oxide green pigments.

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