Theoretical Study of Aluminum Hydroxide as a Hydrogen-Bonded Layered Material

Kim, Dong-Wook; Jung, Jong Hyun; Ihm, Jisoon

doi:10.3390/nano8060375

Cited by 22 publications

(8 citation statements)

References 37 publications

(37 reference statements)

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“…The energy gap of Al (OH) 3 as-prepared is 4.4 eV as a consequence of equation 9. While Al2O3 annealing at 400 °C results in 4.1 eV, this result agrees with the reference [22]. While the vision of (V2O5) as prepared in Figure 1b appear annealing temperature was increased, the transmittance border shifted to a lower wavelength (blue shift) from 520 nm to 412 nm.…”

Section: Optical Properties Of the Nanoparticle Solutionssupporting

confidence: 89%

Untitled

2023

J. Med. Chem. Sci.

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Two nanoparticles, aluminum dioxide (Al2O3) and vanadium pentoxide (V2O5) were prepared by hydrothermal autoclave and reflex methods, respectively. Every nanoparticle was heated at two temperatures (90 °C and 400°C). The structures and surface morphology of these nanoparticles were characterized by FT-IR and UV/Visible measurements, X-ray diffraction (XRD), atomic force microscope (AFM), and scanning electron microscopy (SEM). The ninhydrin removal was measured for these nanoparticles. The results showed vanadium pentoxide has a higher ninhydrin removal activity in both cases (90 °C and 400 °C) than the aluminum oxide and the nanoparticles heated at 400 °C have more ninhydrin removal activity than the nanoparticles heated at 90 °C.

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Section: Optical Properties Of the Nanoparticle Solutionssupporting

confidence: 89%

Untitled

2023

J. Med. Chem. Sci.

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“…The HR‐TEM images of the starting g‐CDs@Al(OH) 3 , evidenced a layered structure of hundreds of nanometers in lateral size (Figure 2c). [ 36 ] The magnifications of the HR‐TEM micrographs allow to observe the crystalline g‐CDs embedded into the aluminum hydroxide matrix (Figure 2d). The HR‐TEM images recorded post‐calcination of g‐CDs@Al(OH) 3 display an aluminum compound with a more compact structure (Figure 2e).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al₂O₃Hybrids for Anti‐Counterfeiting and Information Encryption

Lü

Wen

et al. 2023

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The preparation of room temperature phosphorescent carbon dots still faces great challenges, especially in the case of carbon dots endowed of visible‐light excitable room temperature phosphorescence (RTP). To date, a limited number of substrates have been exploited to synthesize room temperature phosphorescent carbon dots, and most of them can emit RTP only in solid state. Here, the synthesis of a composite obtained from the calcination of green carbon dots (g‐CDs) blended with aluminum hydroxide (Al(OH)3) is reported. The resultant hybrid material g‐CDs@Al2O3 exhibits blue fluorescence and green RTP emissions in an on/off switch process at 365 nm. Notably, this composite manifests strong resistance to extreme acid and basic conditions up to 30 days of treatment. The dense structure of Al2O3 formed by calcination contributes to the phosphorescent emission of g‐CDs. Surprisingly, g‐CDs@Al2O3 can also emit yellow RTP under irradiation with white light. The multicolor emissions can be employed for anti‐counterfeiting and information encryption. This work provides a straightforward approach to produce room temperature phosphorescent carbon dots for a wide range of applications.

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“…The process does not have complex steps and is environmentally friendly, and the operation method can be further improved to make flake powder with a high specific surface area. In addition to extending the current understanding of boehmite, the results will be applicable to other similar and related systems such as gibbsite [ 49 , 50 ], γ-FeOOH [ 51 ], Co(OH) 2 [ 26 , 52 ], and Cd(OH) 2 [ 53 , 54 ].…”

Section: Introductionmentioning

confidence: 99%

Generating Self-Shaped 2D Aluminum Oxide Nanopowders

2022

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The thermal-assisted exfoliation phenomena of boehmite particles under moderate heating rates were examined. The exfoliation that generated flakes of 5–6 nm in thickness can be achieved because of the perfect cleavage on the boehmite particles that are stripped when thermal treatments bring about dehydration and γ-Al2O3 formation in sequential phase transformation of boehmite. Examinations of the exfoliation effects were carried out on calcined boehmite single crystal particles, which were about 500 nm in diameter, and obtained at three heating rates 0.5, 1.0, and 2.0 °C/min with the heating schedules. The TEM techniques, BET-N2 measurements, XRD-Scherrer equation, and AFM images were employed in the examination. That the BET values increased as increasing of exfoliated flakes reflected two stages of exfoliation. In the beginning stage, during which the BET values were <40 m2/g, the exfoliation resulted from the stress produced by dehydration. In the second stage, the increased rate of surface area was due to the additional force, which originated from the γ-Al2O3 formation. Exfoliation occurred on the cleavage planes {010}, the side pinacoid of the boehmite particle. The generation of flakes resulted in the thinning of boehmite particles. Some of the flakes preserved the external form of boehmite crystals. From the surface energy evaluations of boehmite and γ-Al2O3, it can be inferred that exfoliation is a natural way of thermal treatment.

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Theoretical Study of Aluminum Hydroxide as a Hydrogen-Bonded Layered Material

Cited by 22 publications

References 37 publications

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Untitled

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al₂O₃Hybrids for Anti‐Counterfeiting and Information Encryption

Generating Self-Shaped 2D Aluminum Oxide Nanopowders

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Theoretical Study of Aluminum Hydroxide as a Hydrogen-Bonded Layered Material

Cited by 22 publications

References 37 publications

Untitled

Untitled

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al2O3Hybrids for Anti‐Counterfeiting and Information Encryption

Generating Self-Shaped 2D Aluminum Oxide Nanopowders

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Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al₂O₃Hybrids for Anti‐Counterfeiting and Information Encryption