Electrical conductivity of carbon ash surface immersed with nanoparticles (Co3O4-Cr2O3) for spectroscopic selective surfaces

Abed, Rasheed N.; Abed, Abdul Rahman N.; Abed, Aqeela N.

doi:10.1007/s00289-022-04601-8

Cited by 5 publications

(1 citation statement)

References 35 publications

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“…The material with higher absorbance had lower transmittance and reflectance values. The relationship between absorbance, transmittance, and reflectance observed in this research align with the results of Abed et al [66] using 𝐶𝐶𝐶𝐶 3 𝐶𝐶 4 − 𝐶𝐶𝐶𝐶 2 𝐶𝐶 3 nanocomposites. The energy resulting from exposure to UV-VIS light was highest for coal, followed by andesite and pumice, as shown in Figure 9 (d).…”

Section: Optical Propertiessupporting

confidence: 91%

Investigation of granular natural stone materials as photothermal absorbers for sustainable and environmentally friendly energy harvesting

Sarifudin,

Yaningsih,

Kristiawan

et al. 2024

J Appl Eng Science

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The development of cost-effective and environmentally friendly solar thermal technologies that deliver high performance poses several challenges, where the collector and absorber components play a pivotal role. This research addresses these issues by investigating enhanced temperature generation using a 30 cm × 30 cm Fresnel lens collector under solar illumination from a xenon lamp. Natural stone materials (andesite, coal, and pumice), characterized by granular structures with an average diameter of 1.68–2.00 mm, were selected because of their abundance and eco-friendliness. This research is focused on evaluating the effect of Fresnel lens on temperature generation performance. Two types of temperature generation tests were carried out: wet tests (where the natural stone materials were immersed in distilled water) and dry tests (where the natural stone materials were used in dry conditions). The morphologies of the natural stone materials were examined using an optical microscope and scanning electron microscope. Furthermore, the optical properties of the natural stone materials were analyzed using an ultraviolet–visible (UV–VIS) spectrophotometer. The findings revealed that there were significant improvements in the photothermal absorber performance with the use of a Fresnel lens in dry tests, where the highest temperature was achieved for coal (103.25 °C), followed by andesite (89.00 °C) and pumice (73.00 °C). The impurities varied between the materials, where the impurities were most dominant for pumice while coal was more uniform. Further examination using scanning electron microscope showed that all materials had light-trapping structures in the form of rough surfaces, pores, and crack gaps. Andesite was dominated by rough surfaces, while coal and pumice were dominated by crack gaps and pores, respectively. However, based on the UV–VIS spectrophotometric results, there were no correlations between the optical properties (absorbance, reflectance, and transmittance) and temperature achieved by the photothermal absorber materials. This research demonstrates the potential of using natural stone materials as photothermal absorbers in combination with a Fresnel lens collector for low-to-medium temperature solar thermal applications.

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Section: Optical Propertiessupporting

confidence: 91%

Investigation of granular natural stone materials as photothermal absorbers for sustainable and environmentally friendly energy harvesting

Sarifudin,

Yaningsih,

Kristiawan

et al. 2024

J Appl Eng Science

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Synthesis, Structural, and Optical Properties of Modified Poly(vinyl Chloride) Thin Films by Ethylenediamine Loaded with Metal Oxide Nanoparticles

Abed,

Rashad,

Hayawi Rahman

et al. 2024

ChemistrySelect

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Poly (vinyl chloride) (PVC) films modified with ethylenediamine (en) and doped by nanoparticles (TiO2, ZnO, NiO, and MgO). A mixture of 0.5 g PVC/en dissolved in THF and 0.01 wt % of nanoparticles were used in doping PVC to produce the nanocomposite films. All modified PVC films were characterized by different analysis techniques such as Fourier Transform Infrared (FTIR), Nuclear Magnetic Resonance Spectrometer (NMR), diffusive reflectance spectroscopy (DRS), X‐ray diffraction analysis (XRD), and scanning electron microscopy (SEM). The DRS was used to analyse the scattered IR energy of the samples at wavelengths between (250–1350 nm). The optical properties and oscillator strength were also studied, the transmittance and reflectance values declined for the PVC films, and the absorption coefficient was observed between (79–89 %). The direct energy gap decreased from 4.6 to 1.9, and the indirect energy gap reduced from 4.3 to 1.9. The XRD exhibited a semi‐crystalline structure and the SEM test exhibited a porous structure of all samples. The Urbach energy was increased from 0.8772 eV to 14.712 eV, single oscillator energy ( ) was also increased from 6.38 eV to 13.69 eV and the dispersion energy increased from 23.40 eV to 70.63 eV. Moreover, the surface roughness parameters Ra and Rq of the PVC films in modified and doping were increased from 3.86 nm to 8.14 nm, and 5.08 nm to 10.10 nm respectively. So, PVC results show increased optical properties after modification with en and doping by NPs are used in the light conversion and aerospace industries.

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Influence of cold plasma treatment on the PS/TiO2 film’s optical properties of nanocomposite surfaces

Hashim,

Ali,

Abdulla

et al. 2024

Materials Letters

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Electrical conductivity of carbon ash surface immersed with nanoparticles (Co3O4-Cr2O3) for spectroscopic selective surfaces

Cited by 5 publications

References 35 publications

Investigation of granular natural stone materials as photothermal absorbers for sustainable and environmentally friendly energy harvesting

Investigation of granular natural stone materials as photothermal absorbers for sustainable and environmentally friendly energy harvesting

Synthesis, Structural, and Optical Properties of Modified Poly(vinyl Chloride) Thin Films by Ethylenediamine Loaded with Metal Oxide Nanoparticles

Influence of cold plasma treatment on the PS/TiO2 film’s optical properties of nanocomposite surfaces

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