Low Temperature Synthesis of Hexagonal Shaped α‐Al2O3 Using a Solvothermal Method

Kim, A‐Young; Kim, Hyun Soo; Park, No‐Kuk; Lee, Tae Jin; Lee, Won Gun; Kim, Heun Duk; Park, Jun Woo; Kang, Misook

doi:10.1155/2012/907503

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…A metal-oxygen polymeric network forms as a result of these reactions, thus increasing the degree of crystallization and leading to stability and phase purity even at lower temperature. 20 It can be seen from the XRD patterns that the crystallinity of the nanofibers increased as the sol concentration was increased to 0.9 M, whereas further increase in sol concentration resulted in a decrease in crystallinity/peak heights of the aluminum oxide nanofibers.…”

Section: Methodsmentioning

confidence: 96%

Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Riaz

Sajid-ur-Rehman

Abutalib

et al. 2016

Journal of Elec Materi

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is the most versatile and important ceramic material, having applications in various fields including electronic devices. It is stable at high temperatures and is chemically inert. The sol-gel method, a relatively lowertemperature technique, has been used to synthesize aluminum oxide nanofibers. The molarity of the sol concentration was varied as 0.7 M, 0.8 M, 0.9 M, 1.0 M, and 1.1 M. The structural, optical, and dielectric properties of the assynthesized nanofibers were characterized. x-ray diffraction (XRD) analysis results confirmed formation of a-Al 2 O 3 phase of aluminum oxide, notably without any heat treatment or use of water as solvent. The crystallite size and unit cell volume of the nanofibers increased as the sol concentration was increased to 0.9 M, but further increase in sol concentration resulted in reduction of crystallite size and increase in dislocations. Scanning electron microscopy (SEM) results revealed uniform distribution of nanofibers ($25 nm to 30 nm) under all conditions. Nanofibers prepared using sol concentration of 0.9 M showed high transmission ($89%) in the visible and infrared regions. The energy bandgap varied from 3.69 eV to 4.1 eV with the variation in molar concentration. Lower bandgap correlated with defect-induced states in the bandgap. The high refractive index is indicative of high density of aluminum oxide nanofibers. High grain-boundary resistance (1.455 MX) and high dielectric constant ($15.76) along with low tangent loss were observed at molar concentration of 0.9 M.

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Section: Methodsmentioning

confidence: 96%

Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Riaz

Sajid-ur-Rehman

Abutalib

et al. 2016

Journal of Elec Materi

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“…The major corrosion product formed in the entire layer was Ni(OH) 2 (Ni 2p 3/2 binding energy at 856.6 eV [11]). Only 5% of Al 2 O 3 (Al 2p 3/2 binding energy at 74.5eV [12]) was detected on the outer layer, while the composition slightly increased to 7% in the inner layer. An Al 2p 3/2 peak (3%) was detected at 73.8 eV in the inner layer and was also attributed to the formation of Al 2 O 3 [12].…”

Section: Corrosion Product Characterizationmentioning

confidence: 95%

“…Only 5% of Al 2 O 3 (Al 2p 3/2 binding energy at 74.5eV [12]) was detected on the outer layer, while the composition slightly increased to 7% in the inner layer. An Al 2p 3/2 peak (3%) was detected at 73.8 eV in the inner layer and was also attributed to the formation of Al 2 O 3 [12]. The composition of NiO (854 eV [11]) decreased with the depth of the corrosion product layer.…”

Section: Corrosion Product Characterizationmentioning

confidence: 95%

Characterizing the Electrochemical Corrosion Behaviour of a Ni–28wt.%Al Composite Coating in 3.5% NaCl Solution

Onyeachu¹,

Peng²,

Oguzie³

et al. 2015

Port. Electrochim. Acta

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The electrochemical corrosion behaviour of an electrodeposited Ni-28wt.%Al composite coating was characterized after 24 h and 72 h immersion periods in 3.5% NaCl solution, using electrochemical and surface probe techniques. Open circuit potential (OCP) and potentiodynamic polarization revealed that the Al particles modify the electrochemical corrosion behaviour of the Ni coating by shifting its E OCP more negatively and increasing its anodic dissolution current density, after 24 h immersion in 3.5% NaCl solution. Compared with the Ni coating, the composite can exhibit wellreduced anodic current density and slightly increased cathodic current with immersion up to 72 h. XPS characterization showed that a high rate of water adsorption and rapid formation of a continuous Ni(OH) 2 initially occurs on the composite surface which, however, readily thickens during prolonged immersion time and promotes the corrosion product enrichment with Al 2 O 3 . This greatly decreased the rate of corrosion and susceptibility to pitting for the Ni-28wt.%Al composite after 72 h immersion in 3.5% NaCl solution.

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Investigating Engine Performance and Emission Characteristics of a CI Engine Fueled with Waste Fried Oil Blend Containing Butanol, Alumina, and Silver Nanoparticles

Mishra,

Sanghamitra,

Majji

et al. 2024

Arab J Sci Eng

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Low Temperature Synthesis of Hexagonal Shaped α‐Al₂O₃ Using a Solvothermal Method

Cited by 6 publications

References 28 publications

Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Characterizing the Electrochemical Corrosion Behaviour of a Ni–28wt.%Al Composite Coating in 3.5% NaCl Solution

Investigating Engine Performance and Emission Characteristics of a CI Engine Fueled with Waste Fried Oil Blend Containing Butanol, Alumina, and Silver Nanoparticles

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