Ultraporous monoliths of alumina prepared at room temperature by aluminium oxidation

Vignes, J.‐L.; Frappart, Claude; Costanzo, Thomas Di; Rouchaud, J.C.; Mazérolles, L.; Michel, D.

doi:10.1007/s10853-007-2260-z

Cited by 38 publications

(35 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nanostructured aluminium oxyhydroxide Al 2 O 3 Á nH 2 O (n ¼3.5 -3.6) was prepared by oxidation of aluminium in wet atmosphere through mercury film at room temperature [16]. The obtained material consisted of amorphous nanofibres with a diameter of $5 nm and a length of $ 150 nm, had high ( $99%) porosity and low density (0.02-0.04 g/cm 3 ) [15][16][17].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The obtained material consisted of amorphous nanofibres with a diameter of $5 nm and a length of $ 150 nm, had high ( $99%) porosity and low density (0.02-0.04 g/cm 3 ) [15][16][17]. The specific surface area, measured after heating at 350 1C to remove adsorbed humidity, is about 300 m 2 /g À 1 with an average size of 10 nm for the mesopores.…”

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Peculiarities of the growth of KDP single crystals with incorporated aluminium oxyhydroxide nanoparticles

Притула¹,

Kosinova²,

Vorontsov³

et al. 2012

Journal of Crystal Growth

View full text Add to dashboard Cite

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Peculiarities of the growth of KDP single crystals with incorporated aluminium oxyhydroxide nanoparticles

Притула¹,

Kosinova²,

Vorontsov³

et al. 2012

Journal of Crystal Growth

View full text Add to dashboard Cite

“…Earlier it was shown [15] that heating in nitrogen flow (as well as in air) leads to a decrease in the specific surface of freshly prepared PMA connected with structural changes which cause crystallization into an α phase upon temperature growth to 1200°C [8]. For this purpose, porous structures of PMA samples acti vated by hydrogen were researched.…”

Section: Resultsmentioning

confidence: 99%

“…However, cata lysts and sorbents require alumina with a high specific surface. Such materials include mesoporous oxides obtained by sol gel and template [5][6] methods, as well as nanofibrous aerogels [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Alumina nanofibrous structural self-organization in hollow nanotubes caused by hydrogen treatment

et al. 2014

View full text Add to dashboard Cite

The dependence of high temperature hydrogen activation on the structure of nanofibrous alu mina (filament diameter of 5 nm) was shown. Due to self organization, nanofibers are twisted in spirals and then in a second stage the spirals interlock and form alumina tubes, which then transform into bundles. In the process of hydrogen activation, the specific surface area changes and amorphous alumina nanowires develop into a nanocrystalline phase. TEM investigations showed that high temperature hydrogen activation led to the self organization of the alumina nanofibrous structure into hollow nanotubes with a diameter close to 30 nm.

show abstract

“…The raw UPA samples were grown at room temperature, in humid atmosphere, by oxidation of laminated aluminium plates through a liquid mercury-silver layer [8,9]. The growth rate of these UPA monoliths is $1 cm h À1 .…”

Section: Materials Preparationmentioning

confidence: 99%

Synthesis and photoluminescence properties of nanostructured mullite/α-Al2O3

et al. 2014

View full text Add to dashboard Cite

Phase transformation of a-Al 2 O 3 to mullite was observed by correlated X-ray diffraction and low-temperature (7 K) time-and energyresolved photoluminescence methods. The aluminosilicate solids with different Si:Al ratios were prepared after thermal treatment (1400°C) of ultraporous alumina (UPA) monoliths impregnated with vapour of silica precursors at room temperature. The initial dispersion of Si is homogeneous on a size-scale of 5 nm raw UPA fibres, which grow in size during the thermal treatment stage up to $50-100 nm. Three phases were resolved in the considered SiO 2 /Al 2 O 3 system: silica, a-Al 2 O 3 and their interaction product 2:1 mullite (2Al 2 O 3 :SiO 2 ). The 2:1 mullite mass increases and a-Al 2 O 3 mass decreases with an increase of the initial silica content. At the SiO 2 content in the initial system above 20 mol.%, the phase transformation to 2:1 mullite is complete and no a-Al 2 O 3 was observed. No mullite phases with either lower or higher Si content were observed. The fundamental absorption onset energy 7.55 eV of 2:1 mullite was measured.

show abstract

Ultraporous monoliths of alumina prepared at room temperature by aluminium oxidation

Cited by 38 publications

References 23 publications

Peculiarities of the growth of KDP single crystals with incorporated aluminium oxyhydroxide nanoparticles

Peculiarities of the growth of KDP single crystals with incorporated aluminium oxyhydroxide nanoparticles

Alumina nanofibrous structural self-organization in hollow nanotubes caused by hydrogen treatment

Synthesis and photoluminescence properties of nanostructured mullite/α-Al2O3

Contact Info

Product

Resources

About