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三相悬浮液中SiO2粒子的表面吸附特性

DOI: 10.3969/j.issn.1006-7043.201404011

Keywords: 纳米氧化硅粒子, 紫外光谱, 吸附特性, 高固含量悬浮液, 体积浓度, 聚乙二醇

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Abstract:

为了研究高固含量悬浮液制备中稀释液的选配及影响,利用紫外-可见分光光度计研究了纳米SiO2在两相与三相悬浮液中的光学特性,并通过对悬浮液吸光度的分析,研究了纳米SiO2对PEG(200)的吸附特性随体积浓度与制备工艺的变化.结果发现,SiO2/PEG悬浮体系对220~300 nm的紫外光有强烈的吸收;随着乙醇的加入,吸收峰展宽至400 nm,同时对400~800 nm的可见光也有一定吸收作用.以SiO2/PEG悬浮体系的吸收峰为参照,体积浓度低时,三相体系中的SiO2粒子对PEG的吸附受乙醇加入工艺的影响显著;随着SiO2粒子体积浓度的升高,SiO2粒子对PEG的吸附受乙醇加入工艺的影响明显趋弱.经过旋转蒸发后,3种工艺的SiO2/PEG的吸收峰强度位置变化不大,说明乙醇对SiO2粒子吸附特性的影响是可逆的,其他吸收峰的存在说明有一定量的残留乙醇.

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