Preparation, characterization, and infrared emissivity property of optically active polyurethane/TiO{sub 2}/SiO{sub 2} multilayered microspheres

Journal Article · Sat Oct 15 04:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.07.027· OSTI ID:21580012

Yong, Yang ^[1]; Jianhua, Ge; Yongjuan, Wang; Yunxia, Zhu ^[1]

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1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189 (China)

Optically active polyurethane/titania/silica (LPU/TiO{sub 2}/SiO{sub 2}) multilayered core-shell composite microspheres were prepared by the combination of titania deposition on the surface of silica spheres and subsequent polymer grafting. LPU/TiO{sub 2}/SiO{sub 2} 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/TiO{sub 2}/SiO{sub 2} 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/TiO{sub 2}/SiO{sub 2} 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. - Graphical Abstract: Optically active polyurethane/titania/silica (LPU/TiO{sub 2}/SiO{sub 2}) multilayered core-shell composite microspheres were prepared by the combination of titania deposition on the surface of silica spheres and subsequent polymer grafting. Highlights: > Optically active polyurethane based on tyrosine was used for the modification of nanoparticles. > LPU/TiO{sub 2}/SiO{sub 2} multilayered core-shell microspheres were prepared and characterized. > Interfacial interactions and secondary structure affected the infrared emissivity of composite.

• OSTI ID: 21580012
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AMINO ACIDS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DEPOSITION
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
EMISSIVITY
FOURIER TRANSFORMATION
GRAVIMETRIC ANALYSIS
HYDROXY ACIDS
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
INTERACTIONS
MATERIALS
MICROSCOPY
MICROSPHERES
MINERALS
NANOSTRUCTURES
OPTICAL PROPERTIES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOTOELECTRON SPECTROSCOPY
PHYSICAL PROPERTIES
PLASTICS
POLYAMIDES
POLYMERS
POLYURETHANES
QUANTITATIVE CHEMICAL ANALYSIS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
SURFACES
SYNTHETIC MATERIALS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
TYROSINE
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY