Reaction morphology depending on the amounts of HCl and NH4OH and effect of pH on the preparation of TiO2 nanopowder

임창성; 오원춘

오늘 하루 그만보기

P-ISSN1225-0163
E-ISSN2288-8985
SCOPUS, ESCI, KCI

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P-ISSN 1225-0163
E-ISSN 2288-8985

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Vol.20, No.4

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Reaction morphology depending on the amounts of HCl and NH₄OH and effect of pH on the preparation of TiO₂ nanopowder

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985

2007, v.20 no.4, pp.302-307

& (2007). Reaction morphology depending on the amounts of HCl and NH4OH and effect of pH on the preparation of TiO2 nanopowder. , 20(4), 302-307.

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Abstract

The reaction morphology was investigated depending on the amounts of HCl and $NH_4OH$, and the effect of pH was studied on the preparation of $TiO_2$ nanopowders. $TiO_2$ nanopowder was prepared using a titanium tetra-isopropoxide. Subsequently, the effect of pH on the characteristics of the prepared $TiO_2$ nanopowder was evaluated depending on the amounts of the catalysts such as HCl and $NH_4OH$. The morphology and phase transformation of $TiO_2$ powder prepared by hydrolysis of titanium tetra-isopropoxide were strongly influenced by the presence of the catalysts. In the case of using $NH_4OH$, the morphology of the $TiO_2$ powder exhibited powder form. For the HCl catalyst, it showed bulk or granule form. The phase transformations of amorphous $Ti(OH)_4$ to anatase $TiO_2$ and the anatase to rutile was significantly influenced by the kind and amount of thecatalysts.