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首页> 外文期刊>Macromolecular Research >Surface Properties of Silane-Treated Titania Nanoparticles and Their Rheological Behavior in Silicone Oil
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Surface Properties of Silane-Treated Titania Nanoparticles and Their Rheological Behavior in Silicone Oil

机译：硅烷处理的二氧化钛纳米粒子的表面性质及其在硅油中的流变行为

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摘要

The surface of rutile titania nanoparticles was chemically modified by reacting with alkoxy silane.The surface and rheological properties in silicone oil having a wide range of viscosity were investigated.Total surface free energy (gamma_s) of the titania particles decreased from 53.12 to 26.94 mJ/m~2 as the silane used for surface treatment was increased from 0 to 5.0 wt%.The surface free energy of neat silane was 25.5 mJ/m~2,which is quite close to that of titania particles treated with 5.0 wt% silane.Due to the hydrophobic nature of treated-titania,the contact angle was accordingly higher for polar solvent in the order of water > ethylene glycol > formamide > alpha-bromonaph-thalene.In sum of rheological behavior,as the applied shear stress or viscosity of the silicone oil increased,the titania particles tend to form layers and agglomerated clusters,showing shear-thinning and shear-thickening behaviors,sequentially.A good dispersion of discrete titania particles obeying a Newtonian flow behavior was achieved at a surface energy or low concentration of silane-treated titania particles in hydrophobic silicone oil.
机译：通过与烷氧基硅烷反应对金红石型二氧化钛纳米粒子的表面进行化学修饰，研究了粘度范围广的硅油的表面和流变性能，二氧化钛粒子的总表面自由能（γ_s）从53.12降低至26.94 mJ /表面处理所用硅烷的m〜2从0增加到5.0 wt％。纯硅烷的表面自由能为25.5 mJ / m〜2，非常接近于5.0 wt％硅烷处理的二氧化钛颗粒。由于处理过的二氧化钛具有疏水性，因此极性溶剂的接触角较高，依次为水>乙二醇>甲酰胺>α-溴萘-thalene。总的流变行为，如施加的剪切应力或粘度硅油含量增加，二氧化钛颗粒趋于形成层状和团簇状，依次表现出剪切稀化和剪切增稠行为。离散二氧化钛颗粒在牛顿条件下具有良好的分散性在疏水硅油中以表面能或低浓度硅烷处理的二氧化钛颗粒实现流动特性。

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