期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 184, 期 10, 页码 2617-2622出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2011.07.027
关键词
Optically active; TiO2/SiO2; Multilayered; Infrared emissivity
资金
- National Nature Science Foundation of China [50873026, 51077013]
- Southeast University [3207041102]
- Program for Training of 333 High-Level Talent, Jiangsu Province of China [BRA2010033]
Optically active polyurethane/titania/silica (LPU/TiO2/SiO2) multilayered core-shell composite microspheres were prepared by the combination of titania deposition on the surface of silica spheres and subsequent polymer grafting. LPU/TiO2/SiO2 was characterized by FT-IR, UV-vis spectroscopy, X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), SEM and TEM, and the infrared emissivity value (8-14 mu m) was investigated in addition. The results indicated that titania and polyurethane had been successfully coated onto the surfaces of silica microspheres. LPU/TiO2/SiO2 exhibited clearly multilayered core-shell construction. The infrared emissivity values reduced along with the increase of covering layers thus proved that the interfacial interactions had direct influence on the infrared emissivity. Besides, LPU/TiO2/SiO2 multilayered microspheres based on the optically active polyurethane took advantages of the orderly secondary structure and strengthened interfacial synergistic actions. Consequently, it possessed the lowest infrared emissivity value. (C) 2011 Elsevier Inc. All rights reserved.
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