Control of hydrolytic reaction of aluminum particles for aluminum oxide nanofibers

Park, J.H.; Lee, Min Ku; Rhee, Chang Kyu; Kim, W.W.

doi:10.1016/j.msea.2003.10.155

Cited by 37 publications

(20 citation statements)

References 16 publications

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“…Many of the nanfibers have been produced using hydrothermal treatment, with or without surfactant, [18][19][20][21][22][23][24][25] and sol-gel [17,27] techniques of various alumina precursors, subsequent calcinations dehydrate the solid from the sol-gel solution produced by the hydrothermal process. The solid, which consists of naonfibrous boehmite, may be calcined to obtain thealumina nanofibers.…”

Section: Synthesis Of Alumina Nanofibersmentioning

confidence: 99%

“…The size and morphology of aluminum hydrate nanoparticles synthesized by these processes can be controlled by manipulating the pH value of the reaction mixture, the hydrothermal temperature and aging time, the solvent and the surfactant used. [2,3,[20][21][22][23][24][25][26][27] …”

Section: Synthesis Of Alumina Nanofibersmentioning

confidence: 99%

“…The boehmite formed nanosheets in the sol and gelling process and the curled up fibers or tubes were visible in the TEM images of the boehmite. Alumina nanofibers can be synthesized with metallic aluminum particles [10,22,43,59], Al alkoxides [ 36; 46, 17] or its salts [27,45,47,48,49,51] as the starting materials. Other starting materials that have been used include Al pentanedionate, [50], aluminum hydroxide, [52], alumina composite, [53] aluminum film, [42] and sodium aluminate.…”

Section: Hydrothermal and Sol Gel Processesmentioning

confidence: 99%

“…Other starting materials that have been used include Al pentanedionate, [50], aluminum hydroxide, [52], alumina composite, [53] aluminum film, [42] and sodium aluminate. [54] However, whatever the starting materials used in the synthesis, the nanofibrous boehmite intermediate will have to be formed [22] for the formation of the nanofibers as mentioned above. The starting Al precursor is first hydrolyzed with water to form the hydroxide [17,22,32,37,38], aged to the viscous gel fibers of hydrated AlOOH, which can be calcined directly or electrospun or drawn from the viscous gel and converted to ceramic fibers after firing [16,27,[31][32][33][34][35][36][37].…”

Section: Hydrothermal and Sol Gel Processesmentioning

confidence: 99%

“…The metallic aluminum powder used for the process is prepared by exploding the metal wire by a high density current pulse normally produced by discharging a capacitor bank. The produced particles are spherical of about 80-120 nm [22,43]. For the case in which metallic Al nanoparticles is used the first step of the reactions are depicted as follows: [17,22] (6) reaction (5) leads to boehmite, while reaction (6) leads to formation of the trihydroxide, bayerite, which on dehydration via a series of transformation forms the boehmite:…”

Section: Hydrothermal and Sol Gel Processesmentioning

confidence: 99%

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Synthesis of Alumina Nanofibers and Composites

Noordin¹,

Liew²

2010

Nanofibers

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IntroductionAlumina, Al 2 O 3 , is a ceramic metal oxide of great importance as building material, refractory material, electrical and heat insulator, attributed to its high strength, corrosion resistance, chemical stability, low thermal conductivity, and good electrical insulation. One phase of alumina, the -phase is widely used as catalyst, catalyst support and adsorbent because its high porosity and surface area. It is conventionally prepared by heating the hydrated trihydroxides, gibbsite and bayerite, to temperature of > 1000 o C to obtain the -alumina, corundum, a material with great hardness and low surface area. The trihydroxides, gibbsite, bayerite, both are Al(OH) 3. nH 2 O and the monohydroxyl oxide, boehmite, AlO(OH)·αH 2 O, have the monoclinic crystal structure with similar lattice parameters (a=0.866 nm, b=0.506 nm, c=0.983 nm, =94°34′ in boehmite, a=0.868 nm, b=0.507 nm, c=0.972 nm, =94°34′ in gibbsite, and a=0.867 nm, b=0.506 nm, c=0.942 nm, =90°26′ in bayerite [1,2]. In the process of heat treatment, the trihydroxide undergoes a series of transformations. It loses the water of hydration, then dehydroxalate at < 300 o C to form the monohydroxyl oxide boehmite, AlO(OH), which on further heating to increasingly higher temperatures, changes to the transition aluminas, including the -, -, -, and -phases, which then transform finally to the -form. These transition aluminas are crystalline solids with high porosity and surface areas as well as acidic and basic properties, which make them suitable as adsorbents, catalyst, catalyst support and fabricated into filtration membranes as well as used as fillers or components in polymer/ inorganic composite materials with enhanced mechanical properties. The conventional alumina as obtained are usually powder of particulates. These could be fabricated into alumina fibers by various method, through melt growth techniques including the internal crystallization method and extrusion, electrospraying [3] and electrospinning [4][5][6][7][8] have been developed for producing Al 2 O 3 fibers. The high surface areas of transition aluminas are due to the presence of pores. These pores are irregular in sizes and size distributions, and are mainly micropores of diameter less than 2 nm. Since the synthesis of mesoporous materials was first reported in the late 1980s , a number of methods for the synthesis of mesoporous alumina have been reported [8,9]. More recently, interest in nano-materials and nanotechnology has spurred a fury of investigations

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Section: Synthesis Of Alumina Nanofibersmentioning

confidence: 99%

Section: Synthesis Of Alumina Nanofibersmentioning

confidence: 99%

Section: Hydrothermal and Sol Gel Processesmentioning

confidence: 99%

Section: Hydrothermal and Sol Gel Processesmentioning

confidence: 99%

Section: Hydrothermal and Sol Gel Processesmentioning

confidence: 99%

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Synthesis of Alumina Nanofibers and Composites

Noordin¹,

Liew²

2010

Nanofibers

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Organic light‐emitting fibers and fabrics for truly wearable smart displays: Recent progress and future opportunities

et al. 2022

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Magnetic and photocatalytic effect of Fe‐doped nano‐rod ZnO synthesized by the hydrolysis of metal powders

Uum

Han

Lee

et al. 2007

Phys. Status Solidi (c)

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Fe-doped ZnO nano-rods have been simply synthesized by a hydrolysis method. The starting Zn and Fe nano-powders were incorporated into distilled water, and then the solution was refluxed at 60 °C for 24 h to obtain the precipitation of hydroxide gel from the hydrolysis of Zn and Fe. Finally the thermal treatment was carried out at 300 °C for 1 h. X-ray diffraction patterns for all samples exhibited that the resultant precipitates were completely ZnO powder. The TEM result for Fe-doped ZnO showed rod shape with diameter of 30nm and length of 300nm. With increasing Fe content up to 2 wt.%, the UV-vis spectra were shifted to the long wave length and this result indicates that the band gap was shifted by Fe-doping. Whereas the sample with 5wt.% Fe-doping showed the ferromagnetic behavior at room temperature, the ferromagnetic properties disappeared at the samples with above 5 wt % Fe-doping.

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Control of hydrolytic reaction of aluminum particles for aluminum oxide nanofibers

Cited by 37 publications

References 16 publications

Synthesis of Alumina Nanofibers and Composites

Synthesis of Alumina Nanofibers and Composites

Organic light‐emitting fibers and fabrics for truly wearable smart displays: Recent progress and future opportunities

Magnetic and photocatalytic effect of Fe‐doped nano‐rod ZnO synthesized by the hydrolysis of metal powders

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