Study on the Optically Variable Property of Nano-TiO2
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摘要: 利用透射电镜(TEM)对纳米二氧化钛的形貌和粒度进行分析,将纳米二氧化钛制成汽车漆,利用五角度色差仪对其随角异色性能进行分析。结果表明,单独的纳米二氧化钛漆膜没有随角异色效果,在白底上漆膜显白相,在黑底上显蓝相;纳米二氧化钛和铝粉配合制成汽车漆具有随角异色效果,二氧化钛的粒度对其随角异色性能有很大影响,平均粒径为280 nm的普通钛白改性铝粉漆无随角异色效果,平均粒径为35 nm的纳米二氧化钛改性铝粉漆有显著的随角异色效果,并且随纳米二氧化钛加量的增加,其不同角度的颜色差异增大。这是因为光照到纳米二氧化钛表面发生瑞利散射,与入射光平行方向显金黄相,与入射光垂直方显蓝相,其余方向则随角度变化呈现不同程度的蓝相。Abstract: The morphology and particle size of nano-TiO2 were analyzed by transmission electron microscopy(TEM),and the optically variable property of the automobile paint made of the nano-TiO2 was also analyzed by a five-angle colorimeter.The results show that the paint film containing single nano-TiO2 has no angle-dependent optical effect,showing white phase on the white substrate while blue phase on the black substrate.The automobile paint composed of nano-TiO2 and aluminum powder has an optically variable property.The particle size of TiO2 has a great influence on the optically variable property of the paint,where the aluminum paint modified by ordinary titanium white with an average particle size of 280 nm has no angle-dependent optical effect but it shows significant angle-dependent optical effect for the aluminum paint modified the nano-TiO2 with an average particle size of 35 nm.Furthermore,the color variation from different angles for the paint increases with increase of the nano-TiO2 addition.The angle-dependent optical effect is originated from Rayleigh scattering occurring on the surface of nano-TiO2 under illumination,exhibiting a golden yellow phase in the parallel direction with the incident light,blue phase perpendicular to the incident light and blue phase with different degrees in other directions dependent on the angles.
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Key words:
- nano-TiO2 /
- automobile paint /
- optically variable property /
- Rayleigh scattering
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