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ABSTRACT Ag and AZO/Ag/AZO ceramic films were deposited on cotton fabrics by radio frequency (RF) magnetron sputtering and systematically investigated by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and Fourier Transform... more
ABSTRACT Ag and AZO/Ag/AZO ceramic films were deposited on cotton fabrics by radio frequency (RF) magnetron sputtering and systematically investigated by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and Fourier Transform Infrared Spectroscopy. Physical properties of the coated fabrics were evaluated by infrared reflection rate, air permeability and UPF value. Ag coated cotton fabrics presented an infrared reflection rate of 16% and the highest UPF values of 11.096. The AZO/Ag/AZO coated cotton fabrics exhibited an infrared reflection rate of 18% and the highest UPF values of 21.782. The prepared flexible cotton fabrics can provide UV radiation protection and infrared reflective properties, which make them promising materials for solar control applications.
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ABSTRACT A novel modified Avrami model considering both primary and secondary crystallization has been presented to extract the kinetic behavior of these two crystallization stages in nonisothermal crystallization process of polymers.... more
ABSTRACT A novel modified Avrami model considering both primary and secondary crystallization has been presented to extract the kinetic behavior of these two crystallization stages in nonisothermal crystallization process of polymers. Nonisothermal crystallization kinetics of poly(trimethylene terephthalate)–poly(ethylene glycol) segmented copolyesters (PTEG) has been investigated by differential scanning calorimetry. The crystallization rate constants and Avrami exponents at various cooling rates were obtained from the analyses for neat PTEG and multiwalled carbon nanotube (MWNT) filled PTEG. Secondary crystallization displays a lower-dimensional crystal growth compared with primary crystallization and the results of kinetics analyses are consistent with morphology study. The MWNTs introduced into PTEG matrix take the role of effective nucleating agents during composites crystallization and can expedite the process of crystallization of the matrix by providing more nucleation sites to the crystallizing phase.
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Research Interests: Engineering, Scanning Electron Microscopy, Morphology, Ionic Liquid, Polymers, and 19 morePolymerization, Ionic Liquids, DISTRIBUTION, Physical sciences, Temperature, Conductivity, Thermogravimetry, CHEMICAL SCIENCES, Confinement, Magnetics, Nanospheres, Monomer, Particle Size, Thermogravimetric Analysis, Surface Properties, Distribution, Imidazoles, Infrared Spectrometry, and Ferric Compounds
ABSTRACT AZO/Cu/AZO multilayer films were prepared on glass substrate by radio frequency magnetron sputtering technology. The prepared films were investigated by a four-point probe system, X-ray diffraction, optical transmittance spectra,... more
ABSTRACT AZO/Cu/AZO multilayer films were prepared on glass substrate by radio frequency magnetron sputtering technology. The prepared films were investigated by a four-point probe system, X-ray diffraction, optical transmittance spectra, scanning electron microscope, atomic force microscopy and Fourier transform infrared spectroscopy. The results showed that Cu inner layer started forming a continuous film at the thickness around 11 nm. The prepared AZO/Cu/AZO samples exhibited the visible transmittance of 60–80 % and sample with 15 nm Cu inner layer showed the highest infrared reflection rate of 67 % in FIR region and the lowest sheet resistance of 16.6 Ω/sq. The proper visible transmittance and infrared reflection property of the AZO/Cu/AZO multilayer film make it a promising candidate for future energy conservation materials.
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ABSTRACT We demonstrate a facile one-step route to synthesize polypyrrole (PPy)/graphene oxide (GO) nanocomposite sponges. PPy nanoparticles and GO nanosheets are self-assembled into a well-defined and interconnected three-dimensional... more
ABSTRACT We demonstrate a facile one-step route to synthesize polypyrrole (PPy)/graphene oxide (GO) nanocomposite sponges. PPy nanoparticles and GO nanosheets are self-assembled into a well-defined and interconnected three-dimensional porous network through – interaction during the static polymerization of pyrrole monomers in the presence of GO nanosheets. PPy nanoparticles with the size range of 30–70 nm are uniformly dispersed on the GO surface in the three-dimensional network. The effect of GO nanosheets concentration on the water absorbency of the PPy/GO nanocomposite sponge was investigated. The results show that PPy/GO nanocomposite sponges possess improved water absorbency in distilled water as well as in saline solution. The as-prepared PPy/GO nanocomposite sponge may be a potential candidate in the fields of tissue engineering, biosensors, and controlled release.
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ABSTRACT In this project, AZO/Ag/AZO multilayer films were deposited on polyester fabrics by RF magnetron sputtering technology to fabricate light control textiles. The prepared samples were systematically investigated with scanning... more
ABSTRACT In this project, AZO/Ag/AZO multilayer films were deposited on polyester fabrics by RF magnetron sputtering technology to fabricate light control textiles. The prepared samples were systematically investigated with scanning electron microscope, X-ray diffraction and Fourier Transform Infrared Spectroscopy. Physical properties of the coated fabrics were evaluated by contact angle (CA), air permeability and ultraviolet protection factor (UPF) value. The results indicated that the coated polyester fabrics deposited by AZO (30 nm)/Ag (13 nm)/AZO (30 nm) multilayer film presented a high infrared reflection rate of 95 % and CA of about 91.5°, air permeability of 18 ml/s/cm2 at 100 Pa and UPF values of 35.01. The high infrared reflective property of the AZO/Ag/AZO coated textiles makes them promising candidates for light control.
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ABSTRACT Polypyrrole nanowire/silver nanoparticle composites (PPy/Ag) are obtained in aqueous media through a one-pot method without any external stimulus. PPy nanowires were assembled on the reactive self-degraded template of the complex... more
ABSTRACT Polypyrrole nanowire/silver nanoparticle composites (PPy/Ag) are obtained in aqueous media through a one-pot method without any external stimulus. PPy nanowires were assembled on the reactive self-degraded template of the complex of AgNO3 and methyl orange (MO). During the synthesis process in the dark surrounding, Ag nanoparticles could be uniformly decorated onto the surface of PPy nanowires in situ by the redox reaction of pyrrole and AgNO3. Neither additional reducing agents for the growth of silver nanoparticles nor oxidizing agents for the polymerization of pyrrole are utilized. The formation mechanism, morphologies, structural characteristics, and conductivity of the obtained PPy/Ag nanocomposites are reported. The as-prepared PPy/Ag nanocomposites exhibit well-defined response to the electrochemical reduction of hydrogen peroxide. Moreover, the preliminary antibacterial assays indicate that the PPy/Ag nanocomposites also possess antibacterial abilities against Escherichia coli.
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ABSTRACT AZO thin films were deposited on quartz glass and were treated with electropulsing. Effect of the electropulsing on AZO films was investigated by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Atomic Force... more
ABSTRACT AZO thin films were deposited on quartz glass and were treated with electropulsing. Effect of the electropulsing on AZO films was investigated by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Atomic Force Microscopy (AFM), Hall Effect measurement and UV-visible transmittance spectra. The results showed that AZO films treated with 8 min electropulsing treatment (EPT) presented better crystallization, higher visible transmittance with blue shift, smooth surface and the lowest electrical resistivity of 8.8×10−4 Ω·cm. However, further EPT would degenerate the film properties. After 8 min electropulsing, the electrical conductivity of the AZO thin films increased by about 81%. These results indicate that the fast and low-energy consumed EPT maybe a promising substitution for traditional heat annealing.