Physicochemical characteristics of alumina gel in hydroxyhydrogel and normal form

Meher, T; Basu, A K; Ghatak, Sankar

doi:10.1016/j.ceramint.2004.09.011

Cited by 47 publications

(21 citation statements)

References 12 publications

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“…Characteristic bands are found at the same wave numbers as for methyl alcohol but their intensity is considerably larger. A broadening and increased intensity of the band at 660 cm −1 as compared to the initial solution is attributed to the presence of aluminum oxides [13,21,24]. The appearance of the broadened band at 1,030 cm −1 suggests the presence of the Al-OH bond [25].…”

Section: Resultsmentioning

confidence: 94%

“…Such an accumulation of OH groups in various configurations has to yield a broad band at the wavelength corresponding to OH group oscillations. The peak at 1,660 cm −1 originates from the oscillations in water molecules [21]. In the starting solutions, this peak is weakly visible because of low water content, which is 5 % of the volume.…”

Section: Resultsmentioning

confidence: 99%

“…A second factor supporting the emergence of agglomerates is the nature of aluminum ions, which form [Al(H 2 O) 6 ] 3+ complexes in the presence of water. Particles of water in the complexes are replaced progressively by hydroxyl ions according to the following reaction [21]:…”

Section: Resultsmentioning

confidence: 99%

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Alumina-based nanoparticles obtained by anodic dissolution of Al in electrolytes with alcohol solvents

Starowicz

Stypuła

2014

J Solid State Electrochem

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In the present work, alumina-based nanoparticles were produced by an electrochemical method. Alcohols (methanol, ethanol, and propanol) containing 5 % of water and LiCl were applied as electrolytes. Sizes of the micelles in the obtained solution ranged from 200 nm to over 1 μm depending on the used alcohol. Measurements performed by ultraviolet and visible light (UV-VIS) spectroscopy indicated a presence of aluminum oxides and hydroxides in the solution. Studies using transmission electron microscopy (TEM) revealed that the obtained nanoparticles are in a form of flakes and membranes and their size is~200 nm for methanol and 50 nm for propanol. The composition of the product was characterized by the Fourier transform infrared spectroscopy (FTIR) and x-ray diffraction (XRD). It consists of amorphous Al oxides and hydroxides as well as poorly crystallized aluminates and metallic Al.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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Alumina-based nanoparticles obtained by anodic dissolution of Al in electrolytes with alcohol solvents

Starowicz

Stypuła

2014

J Solid State Electrochem

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“…Origin of small peak at 1,070 cm -1 is also correspond to boehmite [38]. A steep increase of absorption at 800 cm -1 is belongs to Al-O vibration mode of Al 2 O 3 [37,38,41].…”

Section: Resultsmentioning

confidence: 99%

Corrosion resistance of sol–gel alumina coated Mg metal in 3.5 % NaCl solution

Singh

Gupta

Maheshwari

et al. 2014

J Sol-Gel Sci Technol

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This investigation describes the potential of sol-gel derived alumina coating on the corrosion resistance of magnesium metal in 3.5 % NaCl solution. Coating deposition was performed by dip coating technique using boehmite (AlOOH) sol followed by their sintering at 250°C. EDX and FTIR analysis confirmed that alumina is a main constituent of the coating. Microstructural examination of the coated surface demonstrated amorphous nature of coating of 2-3 lm in thickness. Potentiodynamic polarization and electrochemical impedance measurements indicated a considerable improvement in the corrosion resistance of the coated substrates.

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“…The wavenumber of FT-IR spectra in the absence of catechin at 3620, 3521 and 3469 are assigned to gibbsite ( (Meher et al, 2005). On the other hand, the IR absorption bands at 3620, 3527, 3488, 1023 and 561 cm − 1 are absent in the presence of catechin.…”

Section: Ft-ir Spectra Of Al Precipitatesmentioning

confidence: 98%