X-Ray Diffraction, Electron Paramagnetic Resonance and Optical Absorption Study of Bauxite

Reddy, T. Ravindra; Thyagarajan, K.; Montero, Ovidio Almanza; Reddy, Sanapa Reddy Lakshmi; Endo, Tamio

doi:10.4236/jmmce.2014.22015

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Th broad peak indicates the uniform distribution of the glass fibers within the epoxy matr and highlights the amorphous nature of the composite [21,30]. Generally, all the maj sharp peaks in the virgin specimen are due to the Gibbsite phase of the fire-retarda agent, alumina trihydrate [34]. Contrary to the EDS results, the peaks associated with al mina trihydrate disappeared from the burnt specimen XRD spectra irrespective of t presence or absence of oil contamination, suggesting the fire may have consumed the su face-level fire-retardant agent.…”

Section: Resultsmentioning

confidence: 95%

Multiscale Characterization of E-Glass/Epoxy Composite Exposed to Extreme Environmental Conditions

et al. 2021

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Fiber-reinforced polymer matrix composites continue to attract scientific and industrial interest since they offer superior strength-, stiffness-, and toughness-to-weight ratios. The research herein characterizes two sets of E-Glass/Epoxy composite skins: stressed and unstressed. The stressed samples were previously installed in an underground power distribution vault and were exposed to fire while the unstressed composite skins were newly fabricated and never-deployed samples. The mechanical, morphological, and elemental composition of the samples were methodically studied using a dynamic mechanical analyzer, a scanning electron microscope (SEM), and an x-ray diffractometer, respectively. Sandwich composite panels consisting of E-glass/Epoxy skin and balsa wood core were originally received, and the balsa wood was removed before any further investigations. Skin-only specimens with dimensions of ~12.5 mm wide, ~70 mm long, and ~6 mm thick were tested in a Dynamic Mechanical Analyzer in a dual-cantilever beam configuration at 5 Hz and 10 Hz from room temperature to 210 °C. Micrographic analysis using the SEM indicated a slight change in morphology due to the fire event but confirmed the effectiveness of the fire-retardant agents in quickly suppressing the fire. Accompanying Fourier transform infrared and energy dispersive X-ray spectroscopy studies corroborated the mechanical and morphological results. Finally, X-ray diffraction showed that the fire event consumed the surface level fire-retardant and the structural attributes of the E-Glass/Epoxy remained mainly intact. The results suggest the panels can continue field deployment, even after short fire incident.

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Section: Resultsmentioning

confidence: 95%

Multiscale Characterization of E-Glass/Epoxy Composite Exposed to Extreme Environmental Conditions

et al. 2021

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“…XRD diffractograms (Fig. 1b) of ATH nanoparticles, indicated that the ATHw particles had a mixed crystal phase of predominantly monocline gibbsite (Al(OH) 3 ) and meta-stable orthorhombic boehmite (aluminum oxide hydroxide, AlO(OH)) (Reddy et al 2014), being re ected in well-de ned narrow sharp peaks between 18° and 22° and some broader peaks at higher 2-theta (JCPDS No. 33 − 0018), respectively.…”

Section: Structural Morphological and Thermal Properties Of Synthesimentioning

confidence: 99%

Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Kolar

Mušič²,

Korošec

et al. 2021

Preprint

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Differently structured aluminum (tri/mono) hydroxide (Al(OH)3 / AlO(OH)) nanoparticles were prepared and used as thermal-management additives to microfibrillated cellulose (MFC), cast-dried in thin-layer films. Both particles increased the thermal stability of the MFC film, yielding 20–23% residue at 600 °C, and up to 57% lowered enthalpy (to 5.5–7.5 kJ/g) at 0.15 wt% of loading, while transforming to Al2O3. However, the film containing 40 nm large Al(OH)3 particles decomposed in a one-step process, and released up to 20 % more energy between 300–400°C as compared to the films prepared from smaller (21 nm) and meta-stable AlO(OH), which decomposed gradually with an exothermic peak shifted to 480 °C. The latter resulted in a highly flexible, optically transparent (95%), and mechanically stronger (5.7 GPa) film with a much lower specific heat capacity (0.31 − 0.28 J/gK compared to 0.68–0.89 J/gK for MFC-Al(OH)3 and 0.87–1.26 for MFC films), which render it as an effective heat-dissipating material to be used in flexible opto-electronics. Low oxygen permeability (2192.8 cm3/m2day) and a hydrophobic surface (>60°) rendered such a film also useful in ecologically-benign and thermosensitive packaging.

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“…The XRD diffractograms (Fig. 1c) indicated that the ATH particles had a mixed crystal phase of predominantly monocline gibbsite (Al(OH) 3 ) and metastable orthorhombic boehmite (AlO(OH)) (Reddy et al 2014), being reflected in the well-defined narrow sharp peaks between 18°and 22°and some broader peaks at higher 2-theta (JCPDS No. 33-0018), respectively.…”

Section: Structural Morphological and Thermal Properties Of Synthesized Nanoparticlesmentioning

confidence: 99%

Addition of Al(OH)3 versus AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Kolar

Mušič²,

Korošec

et al. 2021

Cellulose

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Differently structured aluminum (tri/mono) hydroxide (Al(OH)3 /AlO(OH)) nanoparticles were prepared and used as thermal-management additives to microfibrillated cellulose (MFC), cast-dried in thin-layer films. Both particles increased the thermal stability of the MFC film, yielding 20–23% residue at 600 °C, and up to 57% lowered enthalpy (to 5.5–7.5 kJ/g) at 0.15 wt% of loading, while transforming to alumina (Al2O3). However, the film containing 40 nm large Al(OH)3 particles decomposed in a one-step process, and released up to 20% more energy between 300 and 400 °C as compared to the films prepared from smaller (21 nm) and meta-stable AlO(OH), which decomposed gradually with an exothermic peak shifted to 480 °C. The latter resulted in a highly flexible, optically transparent (95%), and mechanically stronger (5.7 GPa) film with a much lower specific heat capacity (0.31–0.28 J/gK compared to 0.68–0.89 J/gK for MFC-Al(OH)3 and 0.87–1.26 for MFC films), which rendered it as an effective heat-dissipating material to be used in flexible opto-electronics. Low oxygen permeability (2192.8 cm3/m2day) and a hydrophobic surface (> 60°) also rendered such a film useful in ecologically-benign and thermosensitive packaging.

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X-Ray Diffraction, Electron Paramagnetic Resonance and Optical Absorption Study of Bauxite

Cited by 5 publications

References 9 publications

Multiscale Characterization of E-Glass/Epoxy Composite Exposed to Extreme Environmental Conditions

Multiscale Characterization of E-Glass/Epoxy Composite Exposed to Extreme Environmental Conditions

Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Addition of Al(OH)3 versus AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

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