화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.13, No.5, 409-417, October, 2005
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Surface Properties of Silane-Treated Titania Nanoparticles and Their Rheological Behavior in Silicone Oil
Joon Sik Hwang, Jeongwoo Lee, and Yoon Ho Chang†
  • Department of Chemical Engineering, Institute of Clear Technology, Inha University, Incheon 402-751, Korea
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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 ( γs) of the titania particles decreased from 53.12 to 26.94 mJ/m2 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/m2, 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＞ α-bromonaphthalene. 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.
Keywords:titania;surfacemodification;surface free energy;silane;rheology
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