Organic Modification on the Sub-micron Particles of TiO2 Pre-coated with SiO2 and Al2O3

Abstract

Abstract: Five kinds of silane and titanate coupling, triethanolamne and pentaerythrite modification regents were used to modify the sub-micron particles of TiO₂ pre-coated with SiO₂ and Al₂O₃. The hydrophobic characteristics of samples at different modification temperatures, regent concentrations and time were investigated. Ahydrophobic index and the relative contact angle in the hydrophobic and wetting experiments were employed to evaluating modification results. The titanate coupling regent(CH₃)₂CHOTi(OCOOR)₂OP(O)(OR')₂ was found to be the best modification regent for the TiO₂ particles pre-coated with SiO₂ and Al₂O₃ from hydrophilicity to hydrophobicity. The checking results of pyrolytic gas chromatography, thermogravimetric analysis and the X-ray photoelectron spectra have shown that some modification regents were tightly coated on the particle surface. The chemical bond of Al—O—Ti is likely to form between the molecule of organic reagent (CH₃)₂CHOTi(OCOOR)₂OP(O)(OR')₂ and the particle surface in the modification process.

Key words: Surface modification, Dispersion, Titanium dioxide, Ultrafine particles, Hydrophobicity

CLC Number:

O612.4

TrendMD:

LIN Yu-Lan, WANG Ting-Jie, QIN Cao, YANG Jun, JIN Yong . Organic Modification on the Sub-micron Particles of TiO₂ Pre-coated with SiO₂ and Al₂O₃[J]. Chem. J. Chinese Universities, 2001, 22(1): 104.

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Organic Modification on the Sub-micron Particles of TiO₂ Pre-coated with SiO₂ and Al₂O₃

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