β-SnWO4 as yellow lead-free pigment by ball milling method: Rietveld refinement, morphology, optical and colorimetric properties

Bentes, Sávio Castro; Nobre, Francisco Xavier; Ferreira, Robson Dantas; Saraiva, Libertalamar Bilhalva; Cunha Mendes, Otoniel da; Dominguez, Lianet Aguilera; Ruiz, Yurimiler Leyet

doi:10.1016/j.matchemphys.2023.128827

Cited by 1 publication

(2 citation statements)

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“…In contrast −a* values indicate contributions related to green color. On the other hand, the colorimetric coordinates +b* and −b* are associated with the colors yellow and blue, respectively . The variations for the L* parameter indicate the illuminance, and have a range between 0 and 100, indicating dark tones for values close to 0, and light tones when close to 100 .…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the colorimetric coordinates +b* and −b* are associated with the colors yellow and blue, respectively. 66 The variations for the L* parameter indicate the illuminance, and have a range between 0 and 100, indicating dark tones for values close to 0, and light tones when close to 100. 67 In addition, the parameters C* and H* are called chroma and Hue angle, respectively, and make up the components that indicate the position of the colorimetric and tristimulus coordinates for color and energy variation.…”

Section: Resultsmentioning

confidence: 99%

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Solvent Effect on the Structural, Optical, Morphology, and Antimicrobial Activity of Silver Phosphate Microcrystals by Conventional Hydrothermal Method

Takeno,

Nobre,

da Costa

et al. 2024

ACS Omega

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The design of particle size and morphology are a promising approach to investigating the properties exhibited by different types of materials. In the present study, the silver phosphate microcrystals (Ag3PO4) were first time synthesized using the hydrothermal and solvothermal method by combination of the solvents water/isopropyl alcohol (SP-IA), water/acetone (SP-AC), water/ammonium hydroxide (AP-AH), all in a ratio of 1:1 (v/v). The synthesized materials were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, and Raman vibrational spectroscopy, where it was confirmed that the pure phase was achieved for all prepared samples. The study of the optical properties by UV–vis diffuse reflectance spectroscopy (UV–vis/DRS) and colorimetry revealed that the obtained materials have an optical bandgap between 2.30 and 2.32 eV. The FE-SEM images collected revealed different morphologies for the synthesized materials, with a predominance of tetraploid-shaped microcrystals for the SP-AC sample, rods for the SP-IA sample, cubes and polyhedral for the SP-WT sample and condensed polyhedral for the SP-AH sample. The photocatalytic performance against the Rhodamine B dye (RhB) was 100%, 98.2%, 94.2%, and 87.8%, using the samples SP-AC, SP-IA, SP-WT, and SP-AH as photocatalyst at time of 12 min. On the other hand, the antimicrobial performance of SP-AC sample showed superior performance, resulting in the minimum inhibitory concentrationMIC of 7.81 μg mL–1 for the strain of E. coli, 7.81 μg mL–1 for the strain of E. aureus, 15.62 μg mL–1 for the strain of P. auruginosa, and 15.62 μg mL–1 for the strains of C. albicans. In this way, was synthesized a promissory antimicrobial and photocatalyst material, through an easy and cost-effective method.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%