Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Srinivas Vemury"'
Publikováno v:
Langmuir. 14:5751-5756
The morphology of flame-generated silica and titania aggregates is characterized by small-angle X-ray scattering (SAXS). Nearly all these powders display mass-fractal morphologies, which are composed of ramified aggregates of nanoscale primary partic
Publikováno v:
Journal of Aerosol Science. 28:599-611
Coagulation of charged aerosols is investigated by developing a sectional numerical model for both particle size and charge distributions and accounting for electrostatic dispersion. Symmetric bipolar charging increases the coagulation rate when part
Publikováno v:
Journal of Materials Research. 12:1031-1042
Nanophase particles with precisely controlled characteristics are made by oxidation of their halide vapors in electrically assisted hydrocarbon flames using needle-shaped or plate electrodes. The particle size and crystallinity decrease with increasi
Autor:
Sotiris E. Pratsinis, Srinivas Vemury
Publikováno v:
Powder Technology. 88:267-273
A review of recent progress on particle formation in gases for synthesis of materials is given focus in the session Particle Formation in Gases at the First International Forum on Particle Technology held in Denver, CO, in August 1994. Most of the pa
Autor:
Sotiris E. Pratsinis, Srinivas Vemury
Publikováno v:
Journal of Aerosol Science. 27:951-966
The effect of charging during flame synthesis of silica particles is investigated. These particles are made by SiCl4 oxidation/hydrolysis in a premixed, CH4O2N2 flat flame. Unipolar and bipolar DC electric fields are created across the flame ax
Publikováno v:
Powder Technology. 86:87-93
The formation of titania powders by oxidation of TiCl4 was studied in a laminar diffusion flame reactor. The effects of flame configuration (fuel and oxidant flow rate and position) as well as precursor TiCl4 loading on the specific surface area and
Autor:
Sotiris E. Pratsinis, Srinivas Vemury
Publikováno v:
Journal of the American Ceramic Society. 78:2984-2992
The effect of dopants on the characteristics of titania particles made by oxidation of TiCl{sub 4} in a laminar diffusion flame reactor is presented. Introduction of dopant SiCl{sub 4} inhibits the transformation of anatase to rutile, due to the form
Autor:
Srinivas Vemury, Sotiris E. Pratsinis
Publikováno v:
Journal of Aerosol Science. 26:175-185
The attainment of self-preserving distributions by coagulation of agglomerate or aggregate particles has been investigated in the continuum and free-molecular regimes. Self-preserving distributions have been computed for agglomerates of various fract
Publikováno v:
Chemical Engineering Science. 49:4939-4948
The flame synthesis of titania particles with special properties for the photooxidation of organic contaminants in water is investigated. Powders with high specific surface area (> 100 m 2 /g) and high anatase content were produced in a hydrocarbon f
Publikováno v:
AIChE Journal. 40:1183-1192
The competition between hydrolysis and oxidation of TiCl[sub 4] during vapor-phase synthesis of titania powders was experimentally investigated. The effects of reactor temperature, reactant mixing and H[sub 2]O/TiCl[sub 4] ratio were studied in a hot