Densification of nanostructured titania assisted by a phase transformation

Kumar, Krishnankutty-Nair P.; Keizer, Klaas; Burggraaf, A.J.; Okubo, Tatsuya; Nagamoto, Hidetoshi; Morooka, Shigeharu

doi:10.1038/358048a0

Cited by 340 publications

(172 citation statements)

References 3 publications

Supporting

Mentioning

147

Contrasting

Unclassified

Order By: Relevance

“…Moreover, nucleation is a cooperative process involving many atoms and during the process the mass transport rate is enhanced. A similar effect has been noticed in the case of anatase to rutile transformation in titania [14].…”

Section: Resultssupporting

confidence: 78%

See 1 more Smart Citation

Effect of sintering atmosphere on the pore-structure stability of cerium-doped nanostructured alumina

Kumar

Tranto

Nair

et al. 1994

Materials Research Bulletin

Self Cite

View full text Add to dashboard Cite

Pore-structure stability of pure and Ce-doped alumina in air and argon atmospheres was studied using DTA, TGA, N 2 ads./des, and XRD with a view to understand the importance of the ionic size of the dopant cation on the porestructure stability of alumina. The ionic size effect was studied by heat treating the Ce-alumina system in both oxidizing and reducing atmospheres to have Ce 4÷ (87 pm) and Ce 3÷ (106 pm) respectively. No compound formation between Ce and alumina was observed. In the case of pure alumina there is a drastic reduction in porosity during the transformation to e-alumina. Ce-doped alumina has a higher DSC transformation temperature corresponding to the (~-alumina transformation compared to pure alumina. Ce-doped alumina showed higher pore-structure stability compared with pure alumina and the stability was relatively higher in reducing atmosphere (higher Ce3÷/Ce 4÷ ratio, higher effective ionic size) compared with oxidizing conditions (lower Ce3+/Ce 4÷ ratio, lower effective ionic size).

show abstract

Section: Resultssupporting

confidence: 78%

“…Porous nanostructured materials are finding increasing importance in the fields of separation technology and catalysis [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. One of the major difficulties in using porous nanostructured ceramics is their inherent tendency for surface area and porosity reduction.…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering atmosphere on the pore-structure stability of cerium-doped nanostructured alumina

Kumar

Tranto

Nair

et al. 1994

Materials Research Bulletin

Self Cite

View full text Add to dashboard Cite

show abstract

“…Tita- 24 nium dioxide is one of the most widely studied semi-conducting 25 photocatalysts for the degradation of organic contaminants from visible light activity to TiO 2 [5][6][7][8][9][10] and these studies include the 37 doping with metal and non-metal ions [11][12][13][14], dye sensitisation 38 [15], and semiconductor coupling, etc.…”

mentioning

confidence: 99%

Silver doped titanium dioxide nanomaterials for enhanced visible light photocatalysis

Seery¹,

George²,

Floris³

et al. 2007

Journal of Photochemistry and Photobiology A: Chemistry

571

325

View full text Add to dashboard Cite

“…Among the various methods available, sol-gel route has been regarded as an excellent method to synthesize nano-sized metallic oxides [21,22] and has been widely employed for the preparation of titanium dioxide nano-particles [23,24]. Because of synthesis from atomic or molecular precursors, sol-gel technique can give better control of particle size and homogeneity in particle distribution [25,26]. Keeping the above aspects, we report in this paper the synthesis of fine nanostructured TiO 2 photocatalyst through cost effective solgel technique using titanium tetra-isopropoxide as a precursor material and its particle size dependent photodegradation of MO.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Organic Dye Using Anatase Tio2 Nanocrystallites under Solar-Irradiation: Effect of Particle Size

Juliet¹

2017

IJRASET

View full text Add to dashboard Cite

Anatase titanium oxide (TiO 2 ) nanocrystallites with tetragonal structure (4/mmm) and space group I4 1 /amd-D 4h 19 were synthesized via sol-gel route, followed by calcination at two different temperatures 400 and 600 °C, to study the effect on photocatalytic reduction of methyl orange (MO) dye. Structural parameters and its variation with calcination temperature for the prepared samples were analyzed using X-ray diffraction pattern. The metal-oxide phase formation was again confirmed from the band assignments of the Fourier transform infrared spectra. Effect of calcination temperature on particle size of the TiO 2 samples was accurately analyzed directly from transmission electron micrographs. Elemental analysis has been performed to identify the purity of the prepared samples. The optical parameters were extracted from the optical absorption data, the band gap values of the TiO 2 powder sample varies from 3.24 to 3.06 eV as calcination temperature increases. The photocatalytic activities of the products were evaluated by studying the degradation of MO dye in aqueous solution by direct solar irradiation. The anatase TiO 2 calcined at 400 o C shows 100 % degradation of MO because of its smaller particle size (9.8 nm) exactly at 3.5 h.Based on the obtained results, the particle size of TiO 2 powders has pronounced influence in photocatalytic activity.

show abstract

Densification of nanostructured titania assisted by a phase transformation

Cited by 340 publications

References 3 publications

Effect of sintering atmosphere on the pore-structure stability of cerium-doped nanostructured alumina

Effect of sintering atmosphere on the pore-structure stability of cerium-doped nanostructured alumina

Silver doped titanium dioxide nanomaterials for enhanced visible light photocatalysis

Reduction of Organic Dye Using Anatase Tio2 Nanocrystallites under Solar-Irradiation: Effect of Particle Size

Contact Info

Product

Resources

About