Macroporous crystalline vanadium oxide foam

Chandrappa, G. T.; Steunou, Nathalie; Livage, Jacques

doi:10.1038/416702a

Cited by 153 publications

(91 citation statements)

References 7 publications

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“…In a typical hydrothermal process [23][24][25], 1g ZnSO 4 Á 7H 2 O (3.47 mmol) is dissolved in 25 ml of distilled water. To this, 10 ml of 2 M NaOH aqueous solution is introduced resulting in the formation of white precipitate.…”

Section: Methodsmentioning

confidence: 99%

Surfactant free hydrothermally derived ZnO nanowires, nanorods, microrods and their characterization

Nagaraju

Ashoka

Chithaiah

et al. 2010

Materials Science in Semiconductor Processing

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a b s t r a c tZnO nanowires, nanorods and microrods have been prepared by an organic-free hydrothermal process using ZnSO 4 and NaOH/NH 4 OH solutions. The powder X-ray diffraction (PXRD) patterns reveal that the ZnO nano/microrods are of hexagonal wurtzite structure. The Fourier transform infrared (FT-IR) spectrum of ZnO powder shows only one significant spectroscopic band at around 417 cm À 1 associated with the characteristic vibrational mode of Zn-O bonding. The thickness 75-300 nm for ZnO nanorods and 0.2-1.8 mm for microrods are identified from SEM/TEM images.UV-visible absorption spectra of ZnO nano/microrods show the blue shift. The UV band and green emission observed in photoluminescence (PL) spectra are due to free exciton emission and singly ionized oxygen vacancy in ZnO. Finally, the mechanism for organicfree hydrothermal synthesis of the ZnO nano/microrods is discussed.

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Section: Methodsmentioning

confidence: 99%

Surfactant free hydrothermally derived ZnO nanowires, nanorods, microrods and their characterization

Nagaraju

Ashoka

Chithaiah

et al. 2010

Materials Science in Semiconductor Processing

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“…(3d 5 ) ions in crystals have orbitally nondegenerate 6 S ground state [2026] and exhibit zero-field splitting (ZFS) due to spinorbit and other interactions [2730], whereas an isotropic g value close to the free-ion value of 2.0023 is expected. However, a g-value very much greater than 2.0 often occurs; in particular, an isotropic g-value at 4.2 occurs and these large g-values arise when certain symmetry elements are present [2023].…”

Section: Epr Study Of Fe 3+ Ions In Porous Casiomentioning

confidence: 99%

“…As a part of our program on porous materials [5], we describe here a simple and quick method of preparing thermally stable macroporous CaSiO 3 , Fe 3! -and Ni 2!…”

Section: Introductionmentioning

confidence: 99%

EPR Study of Fe3+- and Ni2+-Doped Macroporous CaSiO3 Ceramics

et al. 2008

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Abstract. Thermally stable macroporous CaSiO 3 , Fe 3! -and Ni 2! -doped (0.5 to 5 mol%) ceramics have been prepared by solution combustion process by mixing respective metal nitrates (oxidizers), fumed silica. Diformol hydrazine is used as a fuel. The combustion products were identified by their X-ray diffraction and thermal gravimetry/differential thermal analysis. Single phases of b-CaSiO 3 and a-CaSiO 3 were observed at 950 and 1200 °C, respectively. The phase transition temperatures of combustion-derived CaSiO 3 were found to be lower compared to those obtained via solid-state reaction method. It is interesting to note that with an increase in the calcination temperature the samples become more porous with an increase in the pore diameter from 0.2 to 8 µm. The electron paramagnetic resonance (EPR) spectrum of Fe 3! ions in CaSiO 3 exhibits a weak signal at g " 4.20 ) 0

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“…Ceramic porous materials have been a subject of research due to their potential applications in different types of membranes, as well as in other fields as catalyst supports 1 , acoustic or thermal insulators 2 , and biomaterials 3 among others.…”

Section: Introductionmentioning

confidence: 99%

Role of starch characteristics in the properties of low-cost ceramic membranes

Lorente-Ayza

Orts

Pérez-Herranz

et al. 2015

Journal of the European Ceramic Society

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Starch is used as porosity generator in membranes and other porous ceramics. There are different providers that offer a wide variety of starches, which produce distinct pore size distributions. A study was conducted to evaluate the effects of the characteristics of starches (impurities, particle size), obtained from potato, pea, maize and wheat, on the properties of microfiltration membranes formulated with traditional raw materials (the ceramic matrix was composed of quartz, albite and mullite). The results indicated that the pore size distribution and the permeability coefficient of the membrane can be controlled modifying only the particle size of starch. In this way, correlations were obtained between surface mean diameter of starch and membrane properties (characteristic pore diameters d 16 and d 50 , and permeability coefficient). Moreover, it is necessary to use a starch having a mean particle size greater than about 50 microns in order to obtain a significant change in the pore size distribution and an increase in the permeability of the membrane.

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Macroporous crystalline vanadium oxide foam

Cited by 153 publications

References 7 publications

Surfactant free hydrothermally derived ZnO nanowires, nanorods, microrods and their characterization

Surfactant free hydrothermally derived ZnO nanowires, nanorods, microrods and their characterization

EPR Study of Fe3+- and Ni2+-Doped Macroporous CaSiO3 Ceramics

Role of starch characteristics in the properties of low-cost ceramic membranes

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