PROPERTIES OF ORGANIC COATINGS CONTAINING PIGMENTS WITH SURFACE MODIFIED WITH A LAYER OF ZnFe2O4

Nechvílová, Kateřina; Kalendová, Andréa

doi:10.12913/22998624/60783

Cited by 9 publications

(9 citation statements)

References 12 publications

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“…The ZnFe 2 O 4 spinels are thermally stable, insoluble, and resistant to aggressive media, exhibit a high covering power and a reasonable cost. ZnFe 2 O 4 spinel pigments improve the mechanical strength of the binder by a chemical reaction producing cationic soaps, resulting in low solubility and a tendency towards saponification in contact with a corrosive environment [157]. The color of ZnFe 2 O 4 depends on the annealing temperatures and particle size as it causes a reduction of the total reflecting surface of the powder.…”

Section: Coloringmentioning

confidence: 99%

“…At high annealing temperatures, the system suffers a notable modification due to the disappearance of defects (as oxygen vacancies), leading to less distorted tetrahedral and octahedral sites, and consequently better-defined colors [158]. The possibility to select the desired cations in the spinel lattice (Zn 2+ in A sites and Fe 3+ in B sites for ZnFe 2 O 4 ) can be used to change or to create new properties of the pigment dispersed in an organic binder [157].…”

Section: Coloringmentioning

confidence: 99%

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Recent Advances in Synthesis and Applications of MFe2O4 (M = Co, Cu, Mn, Ni, Zn) Nanoparticles

2021

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In the last decade, research on the synthesis and characterization of nanosized ferrites has highly increased and a wide range of new applications for these materials have been identified. The ability to tailor the structure, chemical, optical, magnetic, and electrical properties of ferrites by selecting the synthesis parameters further enhanced their widespread use. The paper reviews the synthesis methods and applications of MFe2O4 (M = Co, Cu, Mn, Ni, Zn) nanoparticles, with emphasis on the advantages and disadvantages of each synthesis route and main applications. Along with the conventional methods like sol-gel, thermal decomposition, combustion, co-precipitation, hydrothermal, and solid-state synthesis, several unconventional methods, like sonochemical, microwave assisted combustion, spray pyrolysis, spray drying, laser pyrolysis, microemulsion, reverse micelle, and biosynthesis, are also presented. MFe2O4 (M = Co, Cu, Mn, Ni, Zn) nanosized ferrites present good magnetic (high coercivity, high anisotropy, high Curie temperature, moderate saturation magnetization), electrical (high electrical resistance, low eddy current losses), mechanical (significant mechanical hardness), and chemical (chemical stability, rich redox chemistry) properties that make them suitable for potential applications in the field of magnetic and dielectric materials, photoluminescence, catalysis, photocatalysis, water decontamination, pigments, corrosion protection, sensors, antimicrobial agents, and biomedicine.

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Section: Coloringmentioning

confidence: 99%

Section: Coloringmentioning

confidence: 99%

Recent Advances in Synthesis and Applications of MFe2O4 (M = Co, Cu, Mn, Ni, Zn) Nanoparticles

2021

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“…[2] Since acrylics are relatively new in the art world and come in a variety of compositions, researchers are still working to characterize their properties fully, especially in regard to their degradation and reaction to conservation treatments. [5] Acrylic paint films have previously been studied with Fourier transform infrared spectroscopy, [6,7] X-ray fluorescence spectroscopy, [1,8] traditional nuclear magnetic resonance spectroscopy (NMR), [9] mass spectrometry, [10] and various chromatographic and microscopy techniques [5,[11][12][13][14][15][16][17][18] ; these, in general, require a sample to be taken from the object or painting of interest. Single-sided NMR, however, can measure objects and chemical processes without sampling: It has been applied to the study of various cultural heritage objects including paintings, [19][20][21][22][23] musical instruments, [24] ceramics, [25,26] and paper, [27,28] as well as to food, [29][30][31][32] manufacturing processes, [33,34] and building materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of pigment concentration on NMR relaxometry in acrylic paints

Rooney

Meldrum

2020

Magnetic Reson in Chemistry

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Acrylic emulsion paint is among the most common media employed by 20th century artists. Since early acrylic paintings have begun to require the attention of conservators, scientists are working to characterize the properties of these paints to facilitate conservation efforts. In this study, we report an investigation of the physical and chemical properties of acrylic emulsion paints using single‐sided NMR in conjunction with gloss measurements and scanning electron microscopy‐energy dispersive spectrometry. Combining the data from these techniques gives insight into pigment‐base interactions and the acrylic curing process, showing that as pigment concentration is increased in paints, the amount of acrylic base adsorbed to pigment particles increases, resulting in films with differing relaxation times. This research both emphasizes and contextualizes the utility of NMR relaxometry in studying cultural heritage objects and prompts further study into the effects of pigment concentration on the curing and conservation of paint films.

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“…Crucial factors include film-substrate adhesion, hardness, impact resistance, cracking and detached properties, elasticity, thickness and gloss. Particularly in the industry, the production of coatings with desired and repeatable properties coatings needs to be investigated [5,14,17]. The specialist literature also reports the studies investigating production process parameters, resistance to corrosion or wear, morphology, adhesion to substrate of powder coatings by different test methods [2,13,16,17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Repainting on the Mechanical Properties, Surface Topography and Microstructure of Polyester Powder Coatings

Szala¹,

Kot²

2017

Adv. Sci. Technol. Res. J.

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The literature does not provide a systematic analysis of the effect of electrostatic powder coating repainting of structural and constructional aluminum elements on their technological parameters. It is industrial practice that worn or damaged coatings be repainted. It is crucial to determine the effect of electrostatic sprayed coatings repainting on their microstructure, roughness and mechanical properties. The aim of the work is to determinate the influence of repainting of powder deposited polyester coatings on their mechanical properties, roughness and microstructure. This study examined three different electrostatic spray epoxy coatings with matt, silk gloss and fine structure-matt finish. Test panels were prepared as single-and double-layer paint coatings on the aluminum alloy 6060 substrate. Hence, six test sets of coatings were deposited. Each set contained six samples. The microstructure of the cross section of coating was investigated by scanning electron microscopy (SEM) and light optical microscopy (metallographic and stereoscopy microscope). The chemical composition of coating was analyzed by the SEM-EDS method. The 2D surface roughness of single-and double-layer coatings and 3D surface topography maps were examined using a profile measurement gauge. The mechanical properties of coatings were measured by cupping, bending, impact, adhesion to substrate tests run according to standard procedures. As a result, the influence of repainting of polyester powder coatings on their properties was determined. The results demonstrate that repainting has no effect on the microstructure and coating adhesion to substrate as well as the bending test results and roughness of matt and silk gloss coatings. It has been found that repainting affects the results of impact and cupping tests as well as the roughness of samples with fine structure surface finish.

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PROPERTIES OF ORGANIC COATINGS CONTAINING PIGMENTS WITH SURFACE MODIFIED WITH A LAYER OF ZnFe2O4

Cited by 9 publications

References 12 publications

Recent Advances in Synthesis and Applications of MFe2O4 (M = Co, Cu, Mn, Ni, Zn) Nanoparticles

Recent Advances in Synthesis and Applications of MFe2O4 (M = Co, Cu, Mn, Ni, Zn) Nanoparticles

Effect of pigment concentration on NMR relaxometry in acrylic paints

Influence of Repainting on the Mechanical Properties, Surface Topography and Microstructure of Polyester Powder Coatings

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