Effect of SiO2 nanoparticles on the phase transformation of TiO2 in micron-sized porous TiO2-SiO2 mixed particles

Hankwon Chang; Sun Kyung Kim; Hee Dong Jang; Sung Wook Cho

doi:10.1016/j.matlet.2011.07.032

Effect of SiO₂ nanoparticles on the phase transformation of TiO₂ in micron-sized porous TiO₂-SiO₂ mixed particles

Hankwon Chang
, Sun Kyung Kim
, Hee Dong Jang^*
, Sung Wook Cho

^*Corresponding author for this work

Geography Education

Korea Institute of Geoscience and Mineral Resources
Sogang University

Research output: Contribution to journal › Journal article › peer-review

16 Scopus citations

Abstract

Spherical and nanoporous TiO₂ and TiO₂-SiO ₂ mixed micro-particles with four different compositions (20/80, 50/50, 80/20, 90/10 in weight ratio of TiO₂/SiO₂) were prepared by spray drying method from colloidal mixtures of amorphous silica and anatase titania nanoparticles. The as-prepared particles were heat-treated at 900 °C for 0.5-5 h. The TiO₂ and TiO₂-SiO₂ particles were spherical in shape and the average particle diameter was about 1 μm. The anatase mass fraction and the specific surface area of TiO ₂-SiO₂ (50 wt.% SiO₂) mixed particles were kept to 61.5% and 30.6%, respectively, of their initial values after 5 h heat-treatment whereas these values of TiO₂ particles were rapidly decreased to 13.0% and 1.2% of their initial values, respectively, within 30 min after heat-treatment. And the anatase mass fraction and specific surface area increased as SiO₂ content in the TiO₂-SiO₂ mixed particles increased.

Original language	English
Pages (from-to)	3272-3274
Number of pages	3
Journal	Materials Letters
Volume	65
Issue number	21-22
DOIs	https://doi.org/10.1016/j.matlet.2011.07.032
State	Published - 2011.11

Keywords

Anatase mass fraction
Anatase-rutile phase transformation
Porous TiO-SiO mixed particles

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10.1016/j.matlet.2011.07.032

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@article{8bac4380a1514e59a19aacc811fe5206,

title = "Effect of SiO2 nanoparticles on the phase transformation of TiO2 in micron-sized porous TiO2-SiO2 mixed particles",

abstract = "Spherical and nanoporous TiO2 and TiO2-SiO 2 mixed micro-particles with four different compositions (20/80, 50/50, 80/20, 90/10 in weight ratio of TiO2/SiO2) were prepared by spray drying method from colloidal mixtures of amorphous silica and anatase titania nanoparticles. The as-prepared particles were heat-treated at 900 °C for 0.5-5 h. The TiO2 and TiO2-SiO2 particles were spherical in shape and the average particle diameter was about 1 μm. The anatase mass fraction and the specific surface area of TiO 2-SiO2 (50 wt.\% SiO2) mixed particles were kept to 61.5\% and 30.6\%, respectively, of their initial values after 5 h heat-treatment whereas these values of TiO2 particles were rapidly decreased to 13.0\% and 1.2\% of their initial values, respectively, within 30 min after heat-treatment. And the anatase mass fraction and specific surface area increased as SiO2 content in the TiO2-SiO2 mixed particles increased.",

keywords = "Anatase mass fraction, Anatase-rutile phase transformation, Porous TiO-SiO mixed particles",

author = "Hankwon Chang and Kim, \{Sun Kyung\} and Jang, \{Hee Dong\} and Cho, \{Sung Wook\}",

year = "2011",

month = nov,

doi = "10.1016/j.matlet.2011.07.032",

language = "English",

volume = "65",

pages = "3272--3274",

journal = "Materials Letters",

issn = "0167-577X",

number = "21-22",

}

TY - JOUR

T1 - Effect of SiO2 nanoparticles on the phase transformation of TiO2 in micron-sized porous TiO2-SiO2 mixed particles

AU - Chang, Hankwon

AU - Kim, Sun Kyung

AU - Jang, Hee Dong

AU - Cho, Sung Wook

PY - 2011/11

Y1 - 2011/11

N2 - Spherical and nanoporous TiO2 and TiO2-SiO 2 mixed micro-particles with four different compositions (20/80, 50/50, 80/20, 90/10 in weight ratio of TiO2/SiO2) were prepared by spray drying method from colloidal mixtures of amorphous silica and anatase titania nanoparticles. The as-prepared particles were heat-treated at 900 °C for 0.5-5 h. The TiO2 and TiO2-SiO2 particles were spherical in shape and the average particle diameter was about 1 μm. The anatase mass fraction and the specific surface area of TiO 2-SiO2 (50 wt.% SiO2) mixed particles were kept to 61.5% and 30.6%, respectively, of their initial values after 5 h heat-treatment whereas these values of TiO2 particles were rapidly decreased to 13.0% and 1.2% of their initial values, respectively, within 30 min after heat-treatment. And the anatase mass fraction and specific surface area increased as SiO2 content in the TiO2-SiO2 mixed particles increased.

AB - Spherical and nanoporous TiO2 and TiO2-SiO 2 mixed micro-particles with four different compositions (20/80, 50/50, 80/20, 90/10 in weight ratio of TiO2/SiO2) were prepared by spray drying method from colloidal mixtures of amorphous silica and anatase titania nanoparticles. The as-prepared particles were heat-treated at 900 °C for 0.5-5 h. The TiO2 and TiO2-SiO2 particles were spherical in shape and the average particle diameter was about 1 μm. The anatase mass fraction and the specific surface area of TiO 2-SiO2 (50 wt.% SiO2) mixed particles were kept to 61.5% and 30.6%, respectively, of their initial values after 5 h heat-treatment whereas these values of TiO2 particles were rapidly decreased to 13.0% and 1.2% of their initial values, respectively, within 30 min after heat-treatment. And the anatase mass fraction and specific surface area increased as SiO2 content in the TiO2-SiO2 mixed particles increased.

KW - Anatase mass fraction

KW - Anatase-rutile phase transformation

KW - Porous TiO-SiO mixed particles

UR - https://www.scopus.com/pages/publications/79960977016

U2 - 10.1016/j.matlet.2011.07.032

DO - 10.1016/j.matlet.2011.07.032

M3 - Journal article

AN - SCOPUS:79960977016

SN - 0167-577X

VL - 65

SP - 3272

EP - 3274

JO - Materials Letters

JF - Materials Letters

IS - 21-22

ER -

Effect of SiO₂ nanoparticles on the phase transformation of TiO₂ in micron-sized porous TiO₂-SiO₂ mixed particles

Abstract

Keywords

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