Synthesis and comparisons of Optical and Gamma Radiation shielding properties for ZnO and SiO2 nanoparticles in PMMA nanocomposites thin films

Soni, Gyanesh; Gouttam, Niharika; Joshi, V. N.

doi:10.1016/j.ijleo.2022.168884

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…After modification, no sharp peak was observed for SiO 2 -NH 2 particles which had the typical peaks for SiO 2, and a typical broad peak was observed at 2θ =15° to 30° for all samples (JCPDS card number: 29-0085) [ 22 ]. This implied that the main structure of the synthesized silica particles was amorphous [ 23 , 24 ] and its structure did not change after modification. It was observed that only peak intensities increased after modification with APTES.…”

Section: Resultsmentioning

confidence: 99%

Hydrophobic surface modification and characterization of melamine foam

Okutan¹,

Boran²,

Ergün³

et al. 2023

Turkish Journal of Chemistry

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Superhydrophobic and oleophilic modification of commercial acoustic melamine foam (MF) was made in this study. The modification was carried out with chitosan (CHI) and silica particles (SiO 2 ), by using both a layer-by-layer-like approach (LbL) and dip coating technique. Subsequently, 1-octadecanethiol was used as a secondary modification agent. QCM-D, SEM, and FTIR analyses confirmed that the coating was successfully performed. After the modification, the column wall thicknesses increased than that of MF and they ranged from 25% to 48% for modified MF with an LbL-like approach (MMF) and modified MF via dip coating technique (MMFd), respectively. The sorption experiments showed that modified MFs, which had a water contact angle (WCA) above 160°, could sorb several model pollutants (vegetable oil, chloroform, ethanol, and toluene) up to 76–130 times their original weight. It had been determined that MMF protects its open-pore structure better than that of MMFd, which indicated that MF has a more uniform pore structure after modification. Furthermore, after 10 cycles of the sorption and release process, there was no significant change in sorption capacity, and they preserved their mechanical stability and flexibility.

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Section: Resultsmentioning

confidence: 99%

Hydrophobic surface modification and characterization of melamine foam

Okutan¹,

Boran²,

Ergün³

et al. 2023

Turkish Journal of Chemistry

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“…In addition, MWCNTs/PMMA was 18% lighter in mass than Al for stopping the protons with the same energy 7 . According to Soni et al 8 , the dispersion of ZnO/SiO 2 NPs inside PMMA increases the gamma radiation shielding. Putting MWCNTs inside poly(methyl methacrylate), or PMMA, made it more stable at high temperatures and cut down on the production of neutrons in pure PMMA.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural, optical, and thermal properties of LaFeO3/Poly(methyl methacrylate)/Poly(vinyl acetate) nanocomposites for radiation shielding

Khalifa,

El Sayed,

Kassem

et al. 2024

Sci Rep

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This work is an attempt to develop flexible radiation shielding based on a blend of polymethyl methacrylate (PMMA)/polyvinyl acetate (PVAc) and LaFeO3 nanoparticles (NPs). LaFeO3 and LaFeO3/PMMA/PVAc were made using simple chemical techniques. A high-resolution transmission electron microscope (HR-TEM) and X-ray diffraction (XRD) showed that well-crystallized LaFeO3 NPs with particles 79 nm in size and an orthorhombic shape were obtained. In addition, XRD confirmed the existence of PMMA, PVAc, and LaFeO3 in the nanocomposite films. Fourier transform infrared (FTIR) confirmed that the LaFeO3 NPs and the reactive functional groups in the blend interacted with each other. Field emission-scan electron microscope (FE-SEM) analysis showed that PMMA and PVAc form a homogenous blend and that the LaFeO3 NPs were spread out inside and on the blend surface. The samples showed transmittance in the range of 30–74% and a small extinction coefficient (≤ 0.08). The samples exhibited a dual-band gap structure, and the direct (indirect) band gap shrank from 5.1 to 4.7 eV (4.9 to 4.4 eV). The thermal analyses showed that the samples are thermally stable up to 260 °C. The Phy-X/PSD software was used to figure out the theoretical gamma-ray attenuation parameters, such as the mass attenuation coefficient, the mean free path, and the half-value layer, for different PMMA/PVAc + x% LaFeO3 composites. It is demonstrated that the PMMA/PVAc + 10 wt% LaFeO3 sample exhibits much better shielding effectiveness than PMMA/PVAc, and hence it is suitable for protecting against radiation.

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“…This substitution is due to the polymers' notable characteristics, such as high flexibility, low cost, low weight, improved chemical stability, and ease of processing. Optically transparent polymers, specifically poly (methyl methacrylate) (PMMA) [5,6], polycarbonate (PC) [6], and poly(vinyl alcohol) (PVA) [7], were employed as optical filters [8].…”

Section: Introductionmentioning

confidence: 99%

Facile design of a low-cost laser CUT-OFF filter with PMMA polymer nanocomposite doped with Mg_0.5Ni_0.5Fe₂O₄: structural, optical, and dielectric properties

Alzahrani,

Abulyazied,

Abomostafa

2024

Phys. Scr.

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This study employed the sol gel auto-combustion approach to synthesize Mg0.5Ni0.5Fe2O4 spinel ferrite nanoparticles. Additionally, the casting method was used to fabricate Mg0.5Ni0.5Fe2O4/PMMA nanocomposite polymer films. The structural properties were analyzed by the utilization of x-ray diffraction pattern (XRD), high resolution transmission electron microscope (HRTEM), and field emission scanning electron microscope (FESEM). The UV-visible spectrophotometer examination was used to evaluate the optical properties of the produced nanocomposite films, such as absorbance, transmittance, indirect energy band gap, Urbach energy, excitation coefficient, and refractive index. Two indirect optical energy gaps are calculated, whereas they decreased from 4.56 eV to 4.33 eV, and from 4.04 eV to 3.01 eV, while the Urbach energy increased from 0.304 eV to 0.524 eV as the nanofillers increased from 0 to 4 wt%. An investigation was conducted to examine the impact of nanoparticle doping on the dielectric constant, electric modulus, and ac conductivity. The Mg0.5Ni0.5Fe2O4/PMMA nanocomposite films demonstrate higher permittivity and ac conductivity and a lower dissipation factor and electric modulus compared to pure PMMA. The dielectric permittivity (ε′) increased from 2.76 to 3.43 at a constant frequency 100 Hz up to 2 wt.% of Mg0.5Ni0.5Fe2O4 then decreased to 2.41 while the dissipation factor tan(δ) decreased from 0.1 to 0.046 at the same frequency. The nanocomposite films are well-suited for utilization in CUT-OFF selective laser filters, solar cells, energy storage devices, and other applications in related industries.

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Synthesis and comparisons of Optical and Gamma Radiation shielding properties for ZnO and SiO2 nanoparticles in PMMA nanocomposites thin films

Cited by 8 publications

References 21 publications

Hydrophobic surface modification and characterization of melamine foam

Hydrophobic surface modification and characterization of melamine foam

Synthesis, structural, optical, and thermal properties of LaFeO3/Poly(methyl methacrylate)/Poly(vinyl acetate) nanocomposites for radiation shielding

Facile design of a low-cost laser CUT-OFF filter with PMMA polymer nanocomposite doped with Mg_0.5Ni_0.5Fe₂O₄: structural, optical, and dielectric properties

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Synthesis and comparisons of Optical and Gamma Radiation shielding properties for ZnO and SiO2 nanoparticles in PMMA nanocomposites thin films

Cited by 8 publications

References 21 publications

Hydrophobic surface modification and characterization of melamine foam

Hydrophobic surface modification and characterization of melamine foam

Synthesis, structural, optical, and thermal properties of LaFeO3/Poly(methyl methacrylate)/Poly(vinyl acetate) nanocomposites for radiation shielding

Facile design of a low-cost laser CUT-OFF filter with PMMA polymer nanocomposite doped with Mg0.5Ni0.5Fe2O4: structural, optical, and dielectric properties

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Resources

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Facile design of a low-cost laser CUT-OFF filter with PMMA polymer nanocomposite doped with Mg_0.5Ni_0.5Fe₂O₄: structural, optical, and dielectric properties