Effect of mineral acids on the production of alumina nanopowder from raw bauxite

Manivasakan, Palanisamy; Rajendran, V.; Rauta, Prema Ranjan; Sahu, Bhakta Bandhu; Panda, B. K.

doi:10.1016/j.powtec.2011.03.037

Cited by 20 publications

(11 citation statements)

References 24 publications

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“…XRD pattern of the synthesised Al 2 O 3 nanoparticles is shown in Fig. 2a and confirms the cubic nature [29]. Functional groups exist in the alumina particles are shown in FTIR spectra in Fig.…”

Section: Resultssupporting

confidence: 61%

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Effect of contact angle, zeta potential and particles size on the in vitro studies of Al ₂ O ₃ and SiO ₂ nanoparticles

Karunakaran¹,

Rangaraj²,

Rajendran³

et al. 2015

IET nanobiotechnol.

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Currently, nanometal oxides find their role in different biological applications such as tissue engineering, implant and bone replacement materials. Owing to the increased use of nanoparticles, it is necessary to understand their release and toxicity in the biological system. In this regard, three independent studies such as in vitro cytotoxicity, antioxidant activity and biocompatibility of nano- and micrometal oxide particles such as alumina (Al2O3) and silica (SiO2) are evaluated. It is evident from cell viability study that nanoAl2O3 and SiO2 particles are less toxic when compared with microAl2O3 and SiO2 to NIH 3T3 cell lines up to 200 µg/ml. Antioxidant properties of micro- and nanoAl2O3 in terms of radical scavenging percentage for micro- and nanoAl2O3 are 59.1% and 72.1%, respectively, at 100 mg. Similarly, the radical scavenging percentage of nano- and bulk SiO2 are 81.0% and 67.2%, respectively. The present study reveals that the cellular behaviour, interaction and biocompatibility of metal oxides differ with dose, particle size, contact angle and zeta potential. The present study opens up a new strategy to analyse in vitro nanotoxicity.

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Section: Resultssupporting

confidence: 61%

“…SiO 2 and Al 2 O 3 nanoparticles were synthesised from natural resources using low cost methods in our laboratory [28, 29] and characterised comprehensively. NanoSiO 2 was synthesised from rice husk using alkaline treatment followed by acid precipitation method [28].…”

Section: Methodsmentioning

confidence: 99%

Effect of contact angle, zeta potential and particles size on the in vitro studies of Al ₂ O ₃ and SiO ₂ nanoparticles

Karunakaran¹,

Rangaraj²,

Rajendran³

et al. 2015

IET nanobiotechnol.

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“…These were the most intense bands of the α‐Al 2 O 3 FT‐IR spectrum, with transmittance values between 22.7 and 37.2% (Table ). The peak of 1114.4 cm −1 may be assigned to Al‐OH bending vibration (Manivasakan et al, ; Crisan et al, ). Also, a few small bands were observed: the first with maxima at 1436.8 and 1384.7 cm −1 , the second with peaks at 1592.6 and 1630.6 cm −1 , and the third with a large band at 3438.5 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Evaluation of alpha and gamma aluminum oxide nanoparticle accumulation, toxicity, and depuration inArtemia salinalarvae

et al. 2013

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In this study, Artemia salina (crustacean filter feeders) larvae were used as a test model to investigate the toxicity of aluminum oxide nanoparticles (Al2O3 NPs) on marine microorganisms. The uptake, toxicity and elimination of α-Al2O3 (50 nm and 3.5 μm) and γ-Al2O3 (5 nm and 0.4 μm) NPs were studied. Twenty-four and ninety-six hour exposures of different concentrations of Al2O3 NPs to Artemia larvae were conducted in a seawater medium. When suspended in water, Al2O3 NPs aggregated substantially with the sizes ranging from 6.3 nm to > 0.3 μm for spherical NPs, and from 250 to 756 nm for rod-shaped NPs. The phase contrast microscope images revealed that NPs deposited inside the guts as aggregates. ICP-MS analysis showed that large particles (3.5 μm α-Al2O3) were not taken up by Artemia, while fine NPs (0.4 μm γ-Al2O3) and ultra-fine NPs (5 nm γ-Al2O3 and 50 nm α-Al2O3) accumulated substantially. Differences in toxicity were detected as changing with NP size and morphology. The malondialdehyde (MDA) levels indicated that smaller γ-Al2O3 (5 nm) NPs were more toxic than larger γ-Al2O3 (0.4 μm) particulates in 96 h. The highest mortality was measured as 34% in 96 h for γ-Al2O3 NPs (5 nm) at 100 mg/L (LC50 > 100 mg/L). γ-Al2O3 NPs were more toxic than α-Al2O3 NPs at in all conditions.

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“…A variety of studies on the utilization of the bauxite in many fields were carried out. Manivasakan et al proposed a novel synthetic method to prepare ultrafine alumina (Al 2 O 3 ) powder using the bauxite, and the results have been applied in the large‐scale production of spherical. Ren et al prepared bauxite‐SiC composite refractories by the high‐grade bauxite and investigated the effects of oxidation of SiC aggregates on the microstructure and properties of bauxite‐SiC composite refractories during the firing process.…”

Section: Introductionmentioning

confidence: 99%

Effect of the calcining temperatures of low‐grade bauxite on the mechanical property of mullite ceramics

Ren

et al. 2017

Int J Applied Ceramic Tech

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The mullite ceramics with excellent properties were prepared using traditional sintering method, and the starting material was low-grade bauxite without any other additives in this paper. The variations in physical and chemical properties in the process of sintering, the specific surface area of calcined bauxite at different calcining temperatures, and the phase composition of the mullite ceramic and its microstructure were investigated by thermal analysis, laser particle analysis, the X-ray diffraction, and scanning electron microscope, respectively. The effect of calcining temperatures of raw bauxite on mechanical property and sintering mechanism of mullite ceramic were explored and researched. The results showed that the flexural strength can reach 180 MPa, a great difference existed in mullite ceramics prepared from calcined bauxite at different calcining temperatures, and the sintering mechanism included densification of raw bauxite, the activities of calcined bauxite powders, and crystals in calcined bauxite. K E Y W O R D Sbauxite, calcining temperature, mullite, sintering mechanism

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Effect of mineral acids on the production of alumina nanopowder from raw bauxite

Cited by 20 publications

References 24 publications

Effect of contact angle, zeta potential and particles size on the in vitro studies of Al ₂ O ₃ and SiO ₂ nanoparticles

Effect of contact angle, zeta potential and particles size on the in vitro studies of Al ₂ O ₃ and SiO ₂ nanoparticles

Evaluation of alpha and gamma aluminum oxide nanoparticle accumulation, toxicity, and depuration inArtemia salinalarvae

Effect of the calcining temperatures of low‐grade bauxite on the mechanical property of mullite ceramics

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Effect of mineral acids on the production of alumina nanopowder from raw bauxite

Cited by 20 publications

References 24 publications

Effect of contact angle, zeta potential and particles size on the in vitro studies of Al 2 O 3 and SiO 2 nanoparticles

Effect of contact angle, zeta potential and particles size on the in vitro studies of Al 2 O 3 and SiO 2 nanoparticles

Evaluation of alpha and gamma aluminum oxide nanoparticle accumulation, toxicity, and depuration inArtemia salinalarvae

Effect of the calcining temperatures of low‐grade bauxite on the mechanical property of mullite ceramics

Contact Info

Product

Resources

About

Effect of contact angle, zeta potential and particles size on the in vitro studies of Al ₂ O ₃ and SiO ₂ nanoparticles

Effect of contact angle, zeta potential and particles size on the in vitro studies of Al ₂ O ₃ and SiO ₂ nanoparticles