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Citation: Gao Yang, Zhao Haibo, He Tao, Zhao Biying. Monolayer Dispersion of Oxides and Salts on Tin Dioxide and Effects on Their Thermal Stability[J]. Chinese Journal of Applied Chemistry, ;1999, 16(2): 46-50. shu

Monolayer Dispersion of Oxides and Salts on Tin Dioxide and Effects on Their Thermal Stability

1.
Institute of Physical Chemistry, Peking University, Beijing 100871

Received Date: 4 September 1998
Available Online: 17 November 1998
Fund Project: 国家自然科学基金重点项目(29733080) (29733080)

The monolayer dispersion of Cr₂O₃, MoO₃, SO₄^2- and CuSO₄ on the surface of SnO₂ and their effects on the thermal stability of SnO₂ ultrafine powder have been studied. The results show that all of these compounds can disperse onto the surface of SnO₂ in a monolayer form, and their dispersion thresholds close with their ultimate dispersion capacities estimated according to a close-packed monolayer model. The monolayer coverage on the surface of SnO₂ can effectively suppress the sintering of SnO₂ grains at high temperature. The radius and specific surface area of SnO₂ grain in the samples sintered at 500℃ depend on the surface coverage of these compounds on SnO₂, which displays an obvious "threshold effect". The sintering of SnO₂ grains can be retarded when the monolayer coverage of the compounds is high enough.
- ultrafine SnO₂,
- monolayer dispersion,
- thermal stability
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