Synthesis of β-Alumina Particles and Surface Characterization

Karim, Md. Rabiul

doi:10.2174/1876530001104010032

Cited by 58 publications

(30 citation statements)

References 26 publications

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“…This hydration effect could result in the distinct weight loss during heat treatment, as shown in the TG analysis (Supporting Information Fig. 2) (Karim et al ., ). However, the OH − ‐bonding character was significantly disappeared in γ‐ and α‐AlONPS by the thermal decomposition at high temperatures.…”

Section: Discussionmentioning

confidence: 97%

Biodistribution and toxicity of spherical aluminum oxide nanoparticles

Park

Lee

Yoon

et al. 2015

J of Applied Toxicology

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With the rapid development of the nano-industry, concerns about their potential adverse health effects have been raised. Thus, ranking accurately their toxicity and prioritizing for in vivo testing through in vitro toxicity test is needed. In this study, we used three types of synthesized aluminum oxide nanoparticles (AlONPs): γ-aluminum oxide hydroxide nanoparticles (γ-AlOHNPs), γ-and α-AlONPs. All three AlONPs were spherical, and the surface area was the greatest for γ-AlONPs, followed by the α-AlONPs and γ-AlOHNPs. In mice, γ-AlOHNPs accumulated the most 24 h after a single oral dose. Additionally, the decreased number of white blood cells (WBC), the increased ratio of neutrophils and the enhanced secretion of interleukin (IL)-8 were observed in the blood of mice dosed with γ-AlOHNPs (10 mg kg À1 ). We also compared their toxicity using four different in vitro test methods using six cell lines, which were derived from their potential target organs, BEAS-2B (lung), Chang (liver), HACAT (skin), H9C2 (heart), T98G (brain) and HEK-293 (kidney). The results showed γ-AlOHNPs induced the greatest toxicity. Moreover, separation of particles was observed in a transmission electron microscope (TEM) image of cells treated with γ-AlOHNPs, but not γ-AlONPs or α-AlONPs. In conclusion, our results suggest that the accumulation and toxicity of AlONPs are stronger in γ-AlOHNPs compared with γ-AlONPs and α-AlONPs owing their low stability within biological system, and the presence of hydroxyl group may be an important factor in determining the distribution and toxicity of spherical AlONPs.

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Section: Discussionmentioning

confidence: 97%

Biodistribution and toxicity of spherical aluminum oxide nanoparticles

Park

Lee

Yoon

et al. 2015

J of Applied Toxicology

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“…3) of sulphated alumina catalysts displayed the bands in the wave number range of 3000-3400 cm -1 and at ~1632 cm -1 corresponding to the hydroxyl groups. 32 However, the bands at ~1100 cm -1 correspond to the symmetric vibrations of S = O group. 33 Increased sulphate content enhances the intensity of the bands and shifts the characteristic vibration of S = O groups towards higher values (~1200 cm -1 ).…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Esterification of Glycerol with Acetic Acid over Highly Active and Stable Alumina-based Catalysts: A Reaction Kinetics Study

Rane

Pudi

Biswas

2016

Chem.Biochem.Eng.Q.

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The catalytic activity of Cu-or Ni monometallic and Cu-Ni bimetallic (Cu/Ni ratio = 3, 1, 0.33) catalysts supported on γ-Al 2 O 3 and SO 4 2-/γ-Al 2 O 3 catalysts were evaluated for esterification of glycerol. The reactions were performed in a batch reactor under reflux at standard reaction conditions: temperature 110 °C, atmospheric pressure, glycerol to acetic acid molar ratio 1:9, and catalyst loading 0.25 g. The best catalytic activity was observed over 2 M SO 4 2-/γ-Al 2 O 3 catalyst, which showed the glycerol conversion of 97 % within 2 hours of reaction. At this condition, the selectivity to glyceryl monoacetate (MAG), glyceryl diacetate (DAG), and glyceryl triacetate (TAG) were 27.0 %, 49.9 % and 23.1 %, respectively, after 5 h of reaction. After three consecutive runs, the 2 M SO 4 2-/γ-Al 2 O 3 catalysts showed superior performance and no loss in activity was observed. The reaction kinetics results over 2 M SO 4 2-/γ-Al 2 O 3 catalyst showed that the dependence on the reaction rate to glycerol concentration was of pseudo-second order, while the activation energy was found to be 106 kJ mol -1 .

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“…3) [12][13][14]. Up to now, several methodologies have been devised for the synthesis of Al 2 O 3 NP: reverse micelle [14], sol-gel processing [15,16], flame spray pyrolysis [17], precipitation [18], hydrothermal [19] and combustion method [20].…”

Section: Figmentioning

confidence: 99%