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Progress in Color, Colorants and Coatings، جلد ۱۴، شماره ۳، صفحات ۲۲۱-۲۳۲
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عنوان انگلیسی Hydrophilic and Photocatalytic Properties of TiO2/SiO2 Nano-layers in Dry Weather
چکیده انگلیسی مقاله This paper describes the changes in TiO2/SiO2 nanolayers properties induced by Ultraviolet- visible spectroscopy (UV) irradiation in terms of hydrophilicity/photocatalycity. The TiO2/SiO2 nano particles were synthesized by the sol-gel method and deposited on soda-lime glass by dip-coating. X-ray diffraction (XRD) of the TiO2 particles showed that the nano-particles were crystallized in anatase crystal structure with a crystallite size of ~12 nm. The morphology and surface roughness of TiO2 nanolayer were observed by scanning electron microscope (SEM) and atomic force microscopy (AFM) analysis. The surface roughness (Ra) for TiO2/Glass and TiO2/SiO2 was measured ~ 5 and 19 nm, respectively. The hardness of nanolayers on the glass was evaluated and scratch thickness for 1000 g sinker was measured ~150 nm. The self-cleaning properties were tested in dry condition (RH< 15%) under UV irradiation by evaluating the oleic acid photodegradation and monitoring the hydrophilic properties of the surface with a contact angle measurement. The result showed that contact angle of the layer decreases from 77 to 42° after 25 h UV irradiation. Fourier-transform infrared spectroscopy- Attenuated total reflectance (FTIR-ATR) showed the elimination of C=O bonds of oleic acid on the surface after UV light irradiation. Water droplet contact angle measurement on TiO2 nano-layer exhibited a less hydrophilicity after UV irradiation and the contact angle changed from 15 to 40°, which may be due to the low atmospheric humidity. Adding SiO2 nanoparticles increases roughness of the nano-layer, from 5 to 19 nm, without a significant effect on the photodegradation rate of oleic acid. 
کلیدواژه‌های انگلیسی مقاله Nano-layers, TiO2, SiO2, Photocatalysis, Hydrophilicity
نویسندگان مقاله M. Khajeh Aminian |
Department of Physics, Yazd University, Yazd, Iran

F. Sajadi |
Department of Physics, Yazd University, Yazd, Iran

M. R. Mohammadizadeh |
Department of Physics, University of Tehran, Tehran, Iran

S. Fatah |
Department of Physics, Yazd University, Yazd, Iran

نشانی اینترنتی http://pccc.icrc.ac.ir/article_81721_2b6cadbebc55ad842f16116a92e509dc.pdf
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