The effects of heating on BaSO4 powders' diffuse reflectance spectra and radiation stability

Михайлов, М. М.; Yuryev, S.A.; Lapin, A. N.; Lovitskiy, A.A.

doi:10.1016/j.dyepig.2018.12.022

Cited by 19 publications

(18 citation statements)

References 14 publications

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“…Besides, the amount of the crosslinking heat released (∆H crosslinking ) during the scan were greatly decreased by the addition of two fillers in this study. During the curing process, the fillers absorbed parts of the energy depending on the filler quantity in the resin systems, which is also confirmed by other investigations [42][43][44]. The dispersion of inorganic fillers in the resin systems hinders the mass and heat transfer, decreasing the reactivity of the system as evidenced by the reduction in the ∆H crosslinking of the crosslinking processes, as shown in Figure 17.…”

Section: The Effect Of Fillers' Chemical Properties On Performances Osupporting

confidence: 78%

Comparative Study of the Performances of Al(OH)3 and BaSO4 in Ultrafine Powder Coatings

Franco

Yang

et al. 2019

Processes

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Ultrafine powder coatings are one of the development directions in the powder coating industry, as they can achieve thin coatings with good leveling and high surface smoothness comparable to liquid coatings. Compared to regular coatings, they experience a higher sensitivity to any incompatibilities, e.g., filler from coating components. The properties of fillers play a great role in the performance of coating films. Aluminum trihydrate (Al(OH)3) is a well-known filler in solvent-based coatings and other polymer industries. To study and evaluate the performances of Al(OH)3 in ultrafine powder coatings, a popular filler, barium sulfate (BaSO4) is used for comparison. Both fillers are added in ultrafine powder coatings based on two of the most commonly used resin systems (polyester-epoxy and polyester). The differences of physical and chemical properties between both fillers have significant influences on several properties of powder paints and coating films. The polar groups (hydrogen bond) in Al(OH)3 result in the strong interaction between inorganic filler and organic polymer matrix, thus decreasing the molecular network mobility and influencing the chain formation, which is verified by differential scanning calorimetric (DSC). The bed expansion ratio (BERs) of powder paints incorporated with Al(OH)3 are much higher than those with BaSO4, which indicate more uniform gas-solid contact during the spraying process. Samples with Al(OH)3 exhibit much lower specular gloss at 60°, which are expected to achieve remarkable matting effects. Superior corrosion resistances can be observed for almost all the coated panels incorporated with Al(OH)3 in contrast to those with BaSO4. Other aspects are slightly influenced by the difference between the two fillers, such as the angle of repose values (AORs) of powder paints, the impact resistance and flexibility of coating films.

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Section: The Effect Of Fillers' Chemical Properties On Performances Osupporting

confidence: 78%

Comparative Study of the Performances of Al(OH)3 and BaSO4 in Ultrafine Powder Coatings

Franco

Yang

et al. 2019

Processes

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“…As shown in the indicated regions (1400 nm and 1900 nm) in Figure 4(b), the pattern is consistently exhibited when compared with previous studies. 6,10 Although Grum and Luckey 6 did not discuss these patterns, Mikhailov et al attributed these patterns due to the formation of water and hydroxide (OH) groups on the surface of the pellets in 1450 nm and 1940 nm. 10 PVA-bonded pellet Figure 5 depicts the relative performance of a PVAbonded pellet in contrast to the reflection standard.…”

Section: Compressed Pelletmentioning

confidence: 99%

“…6,10 Although Grum and Luckey 6 did not discuss these patterns, Mikhailov et al attributed these patterns due to the formation of water and hydroxide (OH) groups on the surface of the pellets in 1450 nm and 1940 nm. 10 PVA-bonded pellet Figure 5 depicts the relative performance of a PVAbonded pellet in contrast to the reflection standard. Figure 5(a) shows a slightly more noticeable dip of reflectance levels in all three pellets compared to its pure compressed form in Figure 4(a).…”

Section: Compressed Pelletmentioning

confidence: 99%

“…8,9 However, the use of BaSO 4 has received commendations due to its radiation stability in reflective coatings. 10 The optical properties of sintered BaSO 4 have received some attention in previous publications, but not in depth. 11 This is perhaps due to its cost-prohibitive methods which requires the use of pressure-sintering during heating which is relatively complex and requiring specialist apparatus.…”

Section: Introductionmentioning

confidence: 99%

“…8,9 However, the use of BaSO 4 has received commendations due to its radiation stability in reflective coatings. 10…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Diffuse reflectance spectroscopic analysis of barium sulfate as a reflection standard within 173–2500 nm: From pure to sintered form

Poh

Jamaludin

Fadzallah

et al. 2019

Journal of Near Infrared Spectroscopy

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The use of barium sulfate (BaSO4) as a low-cost reflectance standard has been documented for some time. In its pure salt form, the optical characteristics do have advantages compared to laboratory-grade sintered polytetrafluoroethylene (PTFE). However, its practical use has little advantage against the stability of PTFE. In this paper, a process of producing pelletized BaSO4, and characterization of its optical reflectance properties is reported. In its sintered form, data-driven analysis shows that BaSO4 is a commendable low-cost, high-reflection and a high-consistency material. The current sintered forms, though crude, registers a relatively stable texture to withstand minor mechanical stress, while having up to an average 92% reflectivity across the UV-VIS-NIR range (173–2500 nm) compared to a PTFE reflection standard.

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Investigation of thermoluminescence response and trapping parameters of natural barite samples from Dongargaon mine, India

et al. 2020

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Dosimetry is a technique that quantitatively measures the ionizing radiation absorbed by matter. The present study was conducted on the barites from a mine at Dongargaon in Central India. Morphological and structural analysis of proposed sample was carried out using X‐ray diffraction and standard error of the mean. Thermal analysis and chemical composition of the proposed sample were carried out using thermogravimetric analysis and differential thermal analysis, and electron probe microanalysis. Thermoluminescence (TL) studies on a natural barite sample were performed using a Nucleonix TL1009I TL reader following sample irradiation with γ‐rays generated from a 60Co irradiation source. A broad TL glow curve was observed after TL study that was then deconvoluted using TLanal deconvolution software. Trapping parameters from the sample such as activation energy (E), order of kinetics (b), and frequency factor (s) were calculated using Chen’s peak shape method, the initial rise method, and Ilich’s method. The results indicated that the natural barite sample could be used in high‐dose TL dosimetric applications in various fields.

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The effects of heating on BaSO4 powders' diffuse reflectance spectra and radiation stability

Cited by 19 publications

References 14 publications

Comparative Study of the Performances of Al(OH)3 and BaSO4 in Ultrafine Powder Coatings

Comparative Study of the Performances of Al(OH)3 and BaSO4 in Ultrafine Powder Coatings

Diffuse reflectance spectroscopic analysis of barium sulfate as a reflection standard within 173–2500 nm: From pure to sintered form

Investigation of thermoluminescence response and trapping parameters of natural barite samples from Dongargaon mine, India

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