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

Journal Article · Sat Oct 15 00:00:00 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, Vol. 184, Issue 10; Other Information: DOI: 10.1016/j.jssc.2011.07.027; PII: S0022-4596(11)00406-3; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

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