Original synthesis of chromium (III) oxide nanoparticles

Gibot, Pierre; Vidal, Loı̈c

doi:10.1016/j.jeurceramsoc.2009.09.019

Cited by 90 publications

(49 citation statements)

References 20 publications

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“…A wide range of applications such as coating materials for thermal protection, wear resistance, humidity sensing and refractory characteristics have been reported (Makhlouf et al, 2013). In addition, this type of NP has been used in green pigment composition (Gibot & Vidal, 2010). As result of the increased use and production of NPs over the last years has led to their release in aquatic environments Hanna et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Acute toxicity of copper and chromium oxide nanoparticles to Daphnia similis

Tavares

Oliveira

Vicentini

et al. 2024

Ecotoxicol. Environ. Contam.

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Copper oxide nanoparticles (CuO NPs) are employed in antifouling paints, and chromium oxide nanoparticles (Cr 2 O 3 NPs) have been used as a green pigment. Their extensive use can contaminate aquatic ecosystems, and the toxicological effects of these NPs to the biota are poorly known. In this study, we evaluated the acute toxicity induced by CuO (15-30 nm) and the higher zeta potential may have contributed to the higher stability in suspension and less potential for agglomeration, partially explaining the higher toxicity of NPs in relation to Cr(NO 3 ) 3 . After the tests, we observed morphological damages such as increase in fat droplets, internal organ exposure and partially disintegration in organisms exposed to all tested substances, NPs or the salts.

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Section: Introductionmentioning

confidence: 99%

Acute toxicity of copper and chromium oxide nanoparticles to Daphnia similis

Tavares

Oliveira

Vicentini

et al. 2024

Ecotoxicol. Environ. Contam.

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“…The acquirement of the desired physical and chemical properties from metal oxide NPs requires an effective preparation method and has become a significant subject of research. There are several nonconventional techniques in order to achieve high quality metal oxide nanoparticles that have been used or are under development for preparing ultrafine nanostructures [7][8][9][10][11][12][13][14][15][16][17][18]. Numerous factors and various precipitation agents were utilized to synthesis magnetic metal oxide nanocrystals with specific structures.…”

Section: Introductionmentioning

confidence: 99%

Structure and Physical Properties of NiO/Co3O4 Nanoparticles

Naseri

Dehzangi²,

Kamari

et al. 2016

Metals

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Abstract:The thermal treatment method was employed to prepare nickel-cobalt oxide (NiO/Co 3 O 4 ) nanoparticles. This method was attempted to achieve the higher homogeneity of the final product. Specimens of nickel-cobalt oxide were characterized by various experimental techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). X-ray diffraction results showed that there was no crystallinity in the predecessor, and it still had the amorphous phase. The formations of the crystalline phases of the nickel-cobalt oxide nanoparticles started from 350-500˝C, and the final products had different crystallite sizes ranging from 11-35 nm. Furthermore, the variation of DC conductivity (σ dc ), impedance, tangent loss (tgδ) and dielectric constant (ε 1 ) of the calcined specimens with frequency in the range of 10 2 -10 6 Hz was investigated. σ dc showed a value of 1.9ˆ10´6 S/m, 1.3ˆ10´6 S/m and 1.6ˆ10´6 S/m for the specimens calcined at 350, 400 and 450˝C, respectively. Additionally, a decrease in tgδ values with an increase in temperature was observed. Finally, the formed nanoparticles exhibited ferromagnetic behaviors, which were confirmed by using a vibrating sample magnetometer (VSM).

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“…12) To date, several techniques have been developed to synthesize Cr 2 O 3 NPs, including thermal decomposition, 13), 14) solgel, 15), 16) hydrothermal, 17), 18) combustion method, 19) citrate gel method, 20) precipitation process 21) and mechanochemical processing. 22) Among these methods, the precipitation method has the merits of simple operation, low cost, as well as good controllability of grain size and morphology of the final product, and thus was used by many researchers for the preparations of Cr 2 O 3 NPs.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Cr<sub>2</sub>O<sub>3</sub> nanoparticles via surfactants-modified precipitation method and their catalytic effect on nitridation of silicon powders

Zhao

Zhang

Liu

et al. 2017

J. Ceram. Soc. Japan

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Cr 2 O 3 nanoparticles (NPs) were successfully prepared by a facile surfactant-modified precipitation method, and their phase composition and microstructure were characterized by X-ray diffraction, field emission-scanning electron microscopy and transmission electron microscopy. The effects of various processing parameters including surfactants type and amount, pH value and firing temperature on the synthesis of Cr 2 O 3 NPs were investigated. Highly dispersed Cr 2 O 3 NPs with an average crystalline size of 17 nm were obtained under the following optimal conditions: [Cr(NO 3 ) 3 ·9H 2 O] = 0.0316 mol/L, PEG/Cr 2 O 3 = 5 wt %, pH = 5.2, calcination temperature = 500°C and holding time = 2 h. Cr 2 O 3 NPs showed a significant accelerating effect on the nitridation of Si powder, the conversion rate of Si to Si 3 N 4 after 2 h at 1300°C reached 100 wt % upon using 3 wt % Cr 2 O 3 NPs as catalysts, but only 40 wt % in the case without using any catalysts.

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Original synthesis of chromium (III) oxide nanoparticles

Cited by 90 publications

References 20 publications

Acute toxicity of copper and chromium oxide nanoparticles to Daphnia similis

Acute toxicity of copper and chromium oxide nanoparticles to Daphnia similis

Structure and Physical Properties of NiO/Co3O4 Nanoparticles

Preparation of Cr<sub>2</sub>O<sub>3</sub> nanoparticles via surfactants-modified precipitation method and their catalytic effect on nitridation of silicon powders

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