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- W2109952488 abstract "The formation and growth mechanism of porous, amorphous, and fine particles were investigated. TiO2 particles were produced in a tubular flow reactor by a chemical vapor deposition technique using titanium tetraisopropoxide as a starting material at low temperatures (573-973 K) and atmospheric pressure. Prepared particles were of submicron size and had large surface area (as large as 270 × 103 m2/kg). According to the proposed mechanism, reactions begin on the reactor wall and then the primary particles form in the gas phase by chemical reactions. The primary particles collide, coalesce with each other and grow. However, significant experimental deviations from the Brownian collision and coalescence theory imply that other processes, such as the surface reactions on the particle, play an important role in the growth, in addition to coalescence. Intraparticle reactions decreased the surface area by filling the pores.On a etudie la formation et le mecanisme de croissance de particules fines, amorphes et poreuses. Des particules de TiO2 ont ete produites dans un reacteur tubulaire a ecoulement continu par une technique de depǒt de vapeur chimique en utilisant le tetra-isopropoxyde de titane comme materiau de depart, a basses temperatures (573-973 K) et a pression atmospherique. Les particules preparees ont une taille inferieure au micron et une grande surface specifique (jusqu'a 270 × 103 m2/kg). D'apres le mecanisme propose, les reactions commencent a la paroi du reacteur, puis les particules primaires se forment dans la phase gazeuse par reaction chimique. Les particules primaires se heurtent, s'agglomerent entre elles et croissent. Cependant, des ecarts experimentaux importants par rapport a la theorie de collision et d'agglomeration brownienne laissent supposer que d'autres phenomenes comme des reactions a la surface des particules jouent aussi un rǒle important dans le mecanisme de croissance. Des reactions a intraparticulaires diminuent la surface specifique en bouchant les pores." @default.
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- W2109952488 date "1987-10-01" @default.
- W2109952488 modified "2023-10-04" @default.
- W2109952488 title "Formation and growth mechanism of porous, amorphous, and fine particles prepared by chemical vapor deposition. Titania from titanium tetraisopropoxide" @default.
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- W2109952488 doi "https://doi.org/10.1002/cjce.5450650508" @default.
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