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ABSTRACT: A series of organic–inorganic hybrid coatings consisting of organic waterborne polyurethane (WPU) and inorganic nanosized
bismuth-doped tin dioxide were successfully synthesized by the in situ polymerization approach. Bi0.1Sn0.9O2 nano-powders were prepared via a new route of sol–gel combustion hybrid method using acetylene black as the fuel. The formed
nano-powders were characterized by transmission electron microscopy and X-ray diffraction (XRD). Bi0.1Sn0.9O2–WPU was then fabricated with isophorone diisocyanate, 2,2-bis(hydroxymethyl) propionic acid and nano-Bi0.1Sn0.9O2-poly(ε-caprolactone) (PCL) as the starting materials. Organic–inorganic hybrid coatings are always achieved with adjustable
contents of Bi0.1Sn0.9O2. The hybrid coatings with Bi0.1Sn0.9O2 loading on the glass substrate exhibited good heat insulation efficiency. The tensile strength and breaking extensibility
of nanocomposite film containing 1.0% of the nano-Bi0.1Sn0.9O2 were measured as 9.35MPa and 248%, respectively. The transmittance of visible light was above 80%. The heat insulation of
glass coated with nano-Bi0.1Sn0.9O2–WPU hybrid was over 60°C in contrast to the commercial blank glass.
Journal of Sol-Gel Science and Technology 05/2012; 51(1):58-62. · 1.63 Impact Factor
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ABSTRACT: Cobalt aluminate (CoAl(2)O(4)) nanoparticles were synthesized using a precursor method with the aid of ultrasound irradiation under various preparation parameters. The effects of the preparation parameters, such as the sonochemical reaction time and temperature, precipitation agents, calcination temperature and time on the formation of CoAl(2)O(4) were investigated. The precursor on heating yields nanosized CoAl(2)O(4) particles and both these nanoparticles and the precursor were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM). The use of ultrasound irradiation during the homogeneous precipitation of the precursor reduces the duration of the precipitation reaction. The mechanism of the formation of cobalt aluminate was investigated by means of Fourier transformation infrared spectroscopy (FT-IR) and EDX (energy dispersive X-ray). The thermal decomposition process and kinetics of the precursor of nanosized CoAl(2)O(4) were investigated by means of differential scanning calorimetry (DSC) and thermogravimetry (TG). The apparent activation energy (E) and the pre-exponential constant (A) were 304.26 kJ/mol and 6.441 x 10(14)s(-1), respectively. Specific surface area was investigated by means of Brunauer Emmett Teller (BET) surface area measurements.
Ultrasonics Sonochemistry 02/2010; 17(5):793-801. · 3.57 Impact Factor
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ABSTRACT: Nanosized copper aluminate (CuAl(2)O(4)) spinel particles have been prepared by a precursor approach with the aid of ultrasound radiation. Mono-phasic copper aluminate with a crystallite diameter of 17nm along the (311) plane was formed when the products were synthesized using Cu(NO(3))(2) x 6H(2)O and Al(NO(3))(3) x 9H(2)O as starting materials, with urea as a precipitation agent at a concentration of 9M. The reaction was carried out under ultrasound irradiation at 80 degrees C for 4h and a calcination temperature of 900 degrees C for 6h. The synthesized copper aluminate particles and the effect of different processing conditions such as the copper source, precipitation agents, sonochemical reaction time, calcination temperature and time were analyzed and characterized by the techniques of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and Fourier transformation infrared spectroscopy (FT-IR).
Ultrasonics Sonochemistry 07/2009; 17(2):344-51. · 3.57 Impact Factor
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ABSTRACT: Spinel copper aluminate (CuAl2O4) nanoparticles were synthesized with the aid of sonication by a precursor approach. The precursors were prepared by sonicating an aqueous solution of copper nitrate, aluminium nitrate, and urea. Upon heating at 900 °C for 6 h, the precursor formed nanosized CuAl2O4 particles with an average size of 17 nm and with a surface area of about 110 m2 g−1. The nanosized copper aluminate particles as well as the precursors were characterized by elemental analysis, powder X-ray diffraction, transmission electron microscopy (TEM) image with electron diffraction pattern, thermogravimetric analysis, differential scanning calorimeter (DSC), Fourier transform of infrared spectroscopy (FT-IR), and Brunauer–Emmett–Teller (BET) surface area measurements. The photocatalytic degradation was investigated using methyl orange under the irradiation of Hg lamp (λ > 400 nm). The resulting degradation rates of the methyl orange were measured to be as high as 98% in 2 h.
Journal of Alloys and Compounds 479:480-483. · 2.29 Impact Factor
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ABSTRACT: Well-defined crystalline dendritic structured lead selenide (PbSe) was prepared via a template-free, facile hydrothermal route using Pb(NO3)2 as the lead ion source, selenourea (CH4N2Se) as the selenide source at 150 °C for 24 h. The sample was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electronic microscopy (TEM). XRD patterns showed that phase-pure PbSe was produced. Novel PbSe dendritic structure is synthesized as indicated by SEM and TEM. The quality and composition of the products was determined with X-ray photoelectron spectroscopy (XPS). The influencing factors for the morphologies are discussed and the formation mechanisms are proposed. The studies on the corresponding photoluminescence (PL) properties of the dendritic structured PbSe were also carried out.
Journal of Alloys and Compounds 493:358-361. · 2.29 Impact Factor
