Preparation of aluminum hydroxide and oxide nanostructures with controllable morphology by wet oxidation of AlN/Al nanoparticles

Казанцев, С. О.; Ложкомоев, А. С.; Глазкова, Е. А.; Готман, И.; Gutmanas, E.Y.; Лернер, М. И.; Psakhie, S. G.

doi:10.1016/j.materresbull.2018.04.011

Cited by 24 publications

(13 citation statements)

References 48 publications

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“…In the 1000-1100 o C temperature range, the surface area decreased significantly indicating first signs of sintering and formation of α-alumina [36]. The changes in physical properties are consistent with the literature [18,35,37]. Based on the variation in SSA, it is expected that upon blending with cement, the water demand will increase with calcination temperature up to 825 o C and thereafter decline.…”

Section: Physical Properties Of Raw and Calcined Awtssupporting

confidence: 87%

“…Thus, the sludge calcined at 825 0 C has the highest surface area. Collapse of pore walls upon heating at higher temperatures results in a decrease in pore volume [35]. In the 1000-1100 o C temperature range, the surface area decreased significantly indicating first signs of sintering and formation of α-alumina [36].…”

Section: Physical Properties Of Raw and Calcined Awtsmentioning

confidence: 99%

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Reuse of UK alum water treatment sludge in cement-based materials

Shamaki

Adu-Amankwah

Black

2021

Construction and Building Materials

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Section: Physical Properties Of Raw and Calcined Awtssupporting

confidence: 87%

Section: Physical Properties Of Raw and Calcined Awtsmentioning

confidence: 99%

Reuse of UK alum water treatment sludge in cement-based materials

Shamaki

Adu-Amankwah

Black

2021

Construction and Building Materials

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“…Aluminum hydroxides Al(OH) 3 (gibbsite, & bayerite) have an important place in extensive aluminum hydroxides. [1][2][3][4][5][6][7][8][9] Gibbsite phase (P2 1 /n, a = 8.641 Å, b = 5.078 Å, c = 9.719 Å, β = 94.566 experimental values) (PDF 29-0041), (gibbsite 2θ = 18.3943 , 20.4975 , 20.6391 ) have frequently smooth hexagonal shape of crystals shape around 150 to 200 nm. The structure can be envisioned as monoclinic close packed sheets and bar shaped particles with packing between consecutive sheets and a gibbsite phase as the fundamental crystals.…”

Section: Introductionmentioning

confidence: 99%

“…Aluminum hydroxides Al(OH) 3 (gibbsite, & bayerite) have an important place in extensive aluminum hydroxides 1‐9 . Gibbsite phase ( P 2 1 / n , a = 8.641 Å, b = 5.078 Å, c = 9.719 Å, β = 94.566 experimental values) (PDF 29‐0041), (gibbsite 2θ = 18.3943°, 20.4975°, 20.6391°) have frequently smooth hexagonal shape of crystals shape around 150 to 200 nm.…”

Section: Introductionmentioning

confidence: 99%

Improved hydrogen generation from Al/water reaction using different synthesized Al( OH ) ₃ catalyst crystalline phases

Prabu

Wang

2021

Int J Energy Res

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The catalytic influence of different crystalline phases of aluminum hydroxide nanoparticles for the hydrogen generation from the reaction of Al and water is described. In this study, different aluminum hydroxide powder crystalline phases (mixed-phase, bayerite phase, gibbsite phase), (Al(OH) 3 ), were distinctly prepared using precipitation methods in different solvents (methanol, ethanol, and HNO 3 ) at room temperature (25 C). Interestingly, the materials synthesized using ethanol and HNO 3 showed bayerite. Using methanol as the solvent showed a gibbsite phase confirmed by X-ray diffraction, XPS, Raman spectroscopy, and field emission spectroscopy (FESEM). Hydrogen generation using small crystal sized bayerite phase and mixed-phase show higher catalytic efficiency than the pure and large gibbsite phase powders and the catalytic effect of different crystalline Al(OH) 3 catalysts in the order of mixed phase>bayerite phase>gibbsite phase. The bayerite phase catalyst displayed the highest yield (100%) within 2 hours, but the gibbsite phase showed around 60% to 70% yield for a long time of 15 hours. However, more gibbsite phaseorientation would have strong catalytic power when it is small and plate-like thin layer (S.No.4, mixed phases).~100% yield of hydrogen can be produced from 1 g Al/100 g water system within~40 minutes using 1 g synthesized Al(OH) 3 (S.No.4). This work delivers a novel technique to generate hydrogen for movable devices.

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“…The DSC–TG analysis curves ( Figure 10 ) of the nanoscale structures synthesized indicated the process characteristics of nanoscale structures obtained from the EEW Al/AlN nanopowder containing no Ag [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial Activity and Sorption Behavior of Al2O3/Ag Nanocomposites Produced with the Water Oxidation of Bimetallic Al/Ag Nanoparticles

et al. 2022

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The water oxidation of bimetallic Al/Ag nanoparticles has been shown to yield nanoscale structures whose morphology, phase composition and textural characteristics are determined by the synthesis conditions. Flower-like nanoscale structures with silver nanoparticles, with an average size of 17 nm, are formed in water at 60 °C. Under hydrothermal conditions at temperatures of 200 °C and a pressure of 16 MPa, boehmite nanoplatelets with silver nanoparticles, with an average size of 22 nm, are formed. The oxidation of Al/Ag nanoparticles using humid air at 60 °C and 80% relative humidity results in the formation of rod-shaped bayerite nanoparticles and Ag nanoparticles with an average size of 19 nm. The thermal treatment of nanoscale structures obtained at a temperature of 500 °С has been shown to lead to a phase transition into γ-Al2O3, while maintaining the original morphology, and to a decrease in the average size of the silver nanoparticles to 12 nm and their migration to the surface of nanoscale structures. The migration of silver to the nanoparticle surface influences the formation of a double electric layer of particles, and leads to a shift in the pH of the zero-charge point by approximately one, with the nanostructures acquiring pronounced antimicrobial properties.

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Preparation of aluminum hydroxide and oxide nanostructures with controllable morphology by wet oxidation of AlN/Al nanoparticles

Cited by 24 publications

References 48 publications

Reuse of UK alum water treatment sludge in cement-based materials

Reuse of UK alum water treatment sludge in cement-based materials

Improved hydrogen generation from Al/water reaction using different synthesized Al( OH ) ₃ catalyst crystalline phases

Antimicrobial Activity and Sorption Behavior of Al2O3/Ag Nanocomposites Produced with the Water Oxidation of Bimetallic Al/Ag Nanoparticles

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Preparation of aluminum hydroxide and oxide nanostructures with controllable morphology by wet oxidation of AlN/Al nanoparticles

Cited by 24 publications

References 48 publications

Reuse of UK alum water treatment sludge in cement-based materials

Reuse of UK alum water treatment sludge in cement-based materials

Improved hydrogen generation from Al/water reaction using different synthesized Al( OH ) 3 catalyst crystalline phases

Antimicrobial Activity and Sorption Behavior of Al2O3/Ag Nanocomposites Produced with the Water Oxidation of Bimetallic Al/Ag Nanoparticles

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Improved hydrogen generation from Al/water reaction using different synthesized Al( OH ) ₃ catalyst crystalline phases