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ABSTRACT: Uniform quaternary Cu(2)FeSnS(4) (CITS) nanotubes of outer diameter 400-800 nm and thickness 100-200 nm have been synthesized for the first time by a simple, rapid and easily scaled-up microwave nonaqueous route using benzyl alcohol as the microwave absorbing solvent. An interesting in situ generated one-dimensional Cu(Tu)Cl nanorod acting as a self-sacrificial template was crucial for the formation of the well-defined CITS nanotubes. Based on the designed time-dependent experiments, a formation mechanism for the CITS nanotubes was also proposed. The resulting CITS nanotubes had a strong absorption in the visible region with a bandgap of 1.71 eV that was optimal for photovoltaic applications. Our study provided a microwave nonaqueous route generally applicable for the synthesis of quaternary chalcogenide semiconductor nanotubes.
Nanotechnology 11/2012; 23(49):495601. · 3.98 Impact Factor
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ABSTRACT: The direct use of macroscopic biopolymer alginate hydrogels (AHs) as a green and effective carrier to stabilize silver nanoparticles (Ag NPs) is presented. The Ag@AHs were characterized by UV-vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electronic microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS). The Ag@AHs showed excellent catalytic performance for the reduction of 4-nitrophenol by NaBH(4) in aqueous solution, which can be easily separated after catalytic reaction and readily reused for three successive reaction cycles, attributing to the high stability of the Ag NPs supported by AHs. Our findings shed light on the design and fabrication of new heterogeneous catalyst with high performance based on the environmentally benign biopolymer hydrogel.
Bioresource technology 11/2012; · 4.25 Impact Factor
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ABSTRACT: Conducting polymeric nanocomposite containing Li–Ni–Sm–Fe–O spinel was synthesized by the chemical oxidizing of aniline in
the presence of LiNi0.5Sm0.08Fe1.92O4 particles. The dielectric and electric modulus properties of the as-prepared samples were investigated over a frequency range
from 106 to 109Hz. The dielectric constant (ε′), dielectric loss (ε″) and dissipation factor (tanδ) for all samples presented relatively high values at low frequency and were found to decrease with the frequency. The values
of ε′, ε″ and tanδ of the nanocomposite were lower than that of the pristine PANI. Electric modulus analysis had been carried out to understand
the electrical relaxation process. The dielectric relaxation time for the nanocomposite became longer due to the introduction
of LiNi0.5Sm0.08Fe1.92O4 particles lowering the crystallinity of PANI.
Journal of Materials Science Materials in Electronics 04/2012; 21(2):206-210. · 1.08 Impact Factor
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ABSTRACT: A novel organic/inorganic composite based on LiNi–ferrospinel with poly(methyl methacrylate) (PMMA) and polyaniline (PANI), PANI/PMMA/LiNi0.5Fe2O4 composite, was synthesized via a facile in-situ polymerization process. The structures of the resulting samples were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, and atomic force microscopy. The optical and thermal properties of the PANI/PMMA/LiNi0.5Fe2O4 composite were studied by fluorescent spectroscopy and thermogravimetry analysis. It was indicated that the existence of LiNi0.5Fe2O4 (LFNO) in the PANI/PMMA/LFNO composite resulted in changes in the fluorescence spectra. The as-obtained composite may have potential for electrical and electromagnetic applications in antistatic materials, electromagnetic shields, radar absorbers, and so forth.
Journal of Macromolecular Science Part B 10/2011; Part B(Vol. 50):2034-2041. · 0.74 Impact Factor
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ABSTRACT: Poly(o-methoxyaniline)(POMA)/BaFe12O19 composite was synthesized via a facile in situ polymerization approach for the first time. The structures of the products were characterized by X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectra, which indicated the existence of BaFe12O19 particles in the composite. The morphology of the as-prepared samples was observed by using field-emission scanning electron microscopy (FESEM), which revealed that the POMA/BaFe12O19 composite appeared in the form of a general pseudo-sphere-like shape and consisted of numerous highly aggregated globules with rough surfaces. The optical properties of the POMA/BaFe12O19 composite were further investigated by UV-vis spectra. The decrease of band gap for the POMA/BaFe12O19 composite revealed that electronic structure of POMA was affected by BaFe12O19 particles.
Journal of Macromolecular Science Part B 05/2011; Part B(Vol. 50):890-896. · 0.74 Impact Factor
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ABSTRACT: Polyaniline(PANI)/LiNi0.5La0.08Fe1.92O4 nanocomposite was synthesized by an in situ polymerization of aniline in the presence of LiNi0.5La0.08Fe1.92O4 nanoparticles. The dielectric properties of a PANI/LiNi0.5La0.08Fe1.92O4 (10 wt% weight ratio of LiNi0.5La0.08Fe1.92O4 to aniline monomer) nanocomposite were investigated in the frequency range of 106–109 Hz. The dielectric constant (ϵ′) and dielectric loss (ϵ″) were frequency dependent, having relatively high values at low frequency and decreasing with increasing frequency. The values of ϵ′ and ϵ″ of PANI/LiNi0.5La0.08Fe1.92O4 nanocomposite were found to be lower than those of the pristine PANI. Electric modulus analysis was carried out to understand the electrical relaxation process.
Journal of Macromolecular Science. 01/2011; Part B(Vol. 50):26-32.
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ABSTRACT: Poly(N-methylaniline)/montmorillonite (PNMA/MMT) composite particles were obtained by using a simple in situ chemical oxidative polymerization method in hydrochloric acid solutions. Fourier transform infrared (FTIR) spectra, UV-visible absorption spectra and scanning electron microscopy (SEM) were carried out to characterize the as-prepared PNMA/MMT composite. On the basis of spectroscopy and morphology analysis, the probable polymerization mechanism was proposed. The potential application of PNMA/MMT composite for removal of heavy metal ions, such as Cu2+ and Zn2+, in aqueous solution was also investigated.
Journal of Macromolecular Science. 09/2010; Part B(Vol. 49):953-959.
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ABSTRACT: A polypyrrole/ferrospinel(NiFe2O4) nanocomposite was prepared by the in situ chemical oxidizing of pyrrole in the presence of NiFe2O4 nanoparticles in water-in-oil (w/o) microemulsion. The structural, morphological, and magnetic properties of the as-prepared polypyrrole/NiFe2O4 nanocomposite were characterized by X-ray diffraction (XRD), Fourier transform infrared spectra, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and magnetic measurements. XRD and FTIR revealed the presence of NiFe2O4 in the nanocomposite. SEM and TEM images illustrated that polypyrrole was coated on the NiFe2O4 surface. The electromagnetic parameters, such as conductivity, saturation magnetization, and coercivity of NiFe2O4 nanoparticles varied after coating with polypyrrole.
Journal of Macromolecular Science. 07/2010; Part B(Vol. 49):652-657.
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ABSTRACT: Polypyrrole (PPY)/SrFe12O19 composites with tunable electrical and magnetic properties were synthesized by in situ polymerization of pyrrole in the presence of SrFe12O19 particles. The structure of PPY/SrFe12O19 composites was characterized by means of Fourier transform infrared spectroscopy and X-ray diffraction. Transmission electron microscope and scanning electron microscope images illustrated that the spherical composites consisted of SrFe12O19 hexagonal plates sheathed by PPY. In the electromagnetic measurments, it was found that the ac conductivity of SrFe12O19 particles increased while the saturation magnetization, remanent magnetization, and coercivity decreased after PPY coating; moreover, the desired electrical and magnetic properties of PPY/SrFe12O19 composites can be modulated simply by controlling the contents of SrFe12O19 particles. A possible mechanism was also proposed to interpret the formation of the PPY/SrFe12O19 composites.
The Journal of Physical Chemistry B 02/2009; 113(5):1376-80. · 3.70 Impact Factor
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ABSTRACT: A reverse microemulsion route was employed to synthesize the electromagnetic functionalized polyaniline/Mn0.6Zn0.4Fe2O4 nanocomposites (PANI/MZFO NCs) using SDS/water/cyclohexane/n-pentanol microemulsion. The structure and morphology of obtained products were investigated by X-ray diffraction (XRD), Fourier
transform infrared (FTIR) spectra, and transmission electron microscopy (TEM). The resulting nanocomposites exhibited a superparamagnetic
behavior. The conductivity of MZFO nanoparticles was improved after coating with PANI. The probable formation mechanism of
PANI/MZFO NCs was proposed. The prepared nanocomposites may have potential applications in magnetoelectric device.
Journal of Materials Science 01/2009; 44(4):1024-1028. · 2.02 Impact Factor
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ABSTRACT: Nanosized Zn(0.6)Cu(0.4)Cr(0.5)Fe(1.5-x)La(x)O(4) (x=0 - 0.06) ferrites doped with La are synthesized by a rheological phase reaction method. Polyaniline (PANI)/ferrite nanocomposites are prepared by in situ polymerization method. The structure, morphology and ferromagnetic property of ferrite powders and nanocomposites are characterized by X-ray powder diffractometer (XRD), transmission electron microscope (TEM), Fourier transform infrared spectra (FTIR), UV-visible spectroscopy (UV), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM). The results indicate that the PANI and nanosized ferrite powders can be combined effectively. The polymers can reduce the agglomeration of nanosized ferrite particles to some extent, which is good for the dispersedness and stabilization of nanoparticles. The PANI/ferrite nanocomposites under applied magnetic field exhibit the hysteretic loops of the ferromagnetic nature. The magnetic properties of nanocomposites are tailored by controlling the ferrite content.
Journal of Colloid and Interface Science 06/2008; 321(2):265-71. · 3.07 Impact Factor
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ABSTRACT: Polyaniline/Zn0.5Cu0.5Fe2O4 nanocomposite was synthesized by a simple, general and inexpensive in-situ polymerization method in w/o microemulsion. The
effects of polyaniline coating on the magnetic properties of Zn0.5Cu0.5Fe2O4 nanoparticles were investigated. The structural, morphological and magnetic properties of as-prepared samples were characterized
by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectra, scanning electron microscopy (SEM) and magnetic measurements.
The morphology analysis confirmed that polyaniline was deposited on the porous surface of magnetic Zn0.5Cu0.5Fe2O4. It was shown that the saturation magnetization and coercivity of Zn0.5Cu0.5Fe2O4 decreased after polyaniline coating, which can be interpreted by the interparticle dipole–dipole interactions that contributed
to magnetic anisotropy and changed the magnetic properties of the nanoparticles.
Applied Physics A 01/2008; 92(2):341-344. · 1.63 Impact Factor
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Journal of Macromolecular Science®. 01/2008; Part B: Physics(Vol. 47):620-626.
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ABSTRACT: Magnetic composite containing polyaniline (PANI)-coated LiNi0.5Gd0.08Fe1.92O4 was synthesized by in situ polymerization of aniline on the surface of LiNi0.5Gd0.08Fe1.92O4 ferrite particles. The obtained samples were characterized by powder X-ray diffraction, Fourier transform infrared spectra, UV–visible absorption spectra, thermogravimetric analysis, transmission electron microscopy (TEM), and vibrating sample magnetometer. The results of spectroanalysis indicated that there was interaction between PANI chains and ferrite particles. TEM study showed that composite presented the core–shell structure. The composite under applied magnetic field exhibited the clear hysteretic behavior at room temperature. The bonding mechanism in the composite had been discussed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007
Journal of Applied Polymer Science 04/2007; 105(2):944 - 950. · 1.29 Impact Factor
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ABSTRACT: Magnetic nanocomposites containing polyaniline (PANI)-coated La-substituted LiNi ferrite (LiNi0.5La0.02Fe1.98O4) were synthesized by in situ polymerization in aqueous solution of hydrochloric acid. The nanocomposites exhibited the magnetic hysteresis nature under applied magnetic field. The saturation magnetization (MS) and coercivity (HC) varied with the ferrite content. The obtained nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), UV-Visible spectroscopy and vibrating sample magnetometer (VSM). TEM and SEM studies showed that the nanocomposites present the core-shell structure. The results of XRD patterns, FT-IR and UV-Visible spectra indicated the formation of PANI-LiNi0.5La0.02Fe1.98O4 nanocomposites and showed that the interaction existed between PANI backbone and ferrite particles in the nanocomposites. The bonding mechanism in the nanocomposites has been proposed.
Chinese Journal of Chemistry 12/2006; 24(12):1804 - 1809. · 0.75 Impact Factor
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ABSTRACT: A self-propagating combustion synthesis (SPCS) method, citrate SPCS method, was used to synthesize Cu0.4Zn0.6Cr0.5SmxFe1.5−xO4 (x=0–0.1) nanosized powders at relatively low temperature. Polyaniline/Cu0.4Zn0.6Cr0.5Sm0.06Fe1.44O4 (CZCS0.06FO) nanocomposites were prepared by in situ polymerization of aniline in the presence of CZCS0.06FO ferrites. The structures, morphologies, and ferromagnetic properties of ferrite powders and nanocomposites were characterized by powder X-ray diffractometer (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), and vibrating sample magnetometer (VSM). The results indicated that ferrite powders were coated effectively by polyaniline, which reduced the agglomeration of ferrite particles to certain extent, and was helpful to the decentralization and stabilization of nanoparticles. The nanocomposites with core-shell structure under applied field exhibited hysteresis loops of the ferromagnetic nature. The nanocomposites were fit for being used as soft magnetic material because of their lower coercivity than that of pure ferrites.
Journal of Rare Earths 26(4):558-562. · 0.90 Impact Factor
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ABSTRACT: Polyaniline (PANI)-LiNi0.5La0.02Fe1.98O4 nanocomposites were synthesized by an in situ polymerization of aniline in the presence of LiNi0.5La0.02Fe1.98O4 ferrite. The products were characterized by Fourier transform infrared (FTIR), atomic force microscopy (AFM), powder X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). FTIR spectra and XRD indicated the formation of the PANI-LiNi0.5La0.02Fe1.98O4 composites. AFM study was shown that the average size of samples was less than 100 nm and the ferrite particles had an effect on the morphology of composites. The nanocomposites under applied magnetic field exhibited the hysteresis loops of the ferrimagnetic nature, the saturation magnetization and the coercivity varied with the ferrite content. The bonding model for the composites was also studied.
European Polymer Journal 42(10):2221-2227. · 2.74 Impact Factor
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ABSTRACT: Nanostructured NiFe2O4 was synthesized by a simple refluxing route using urea as precipitator, sodium dodecylbenzenesulfonate (SDBS) as surfactant template. Powder X-ray diffraction (XRD) and electron diffraction (ED) showed that the as-prepared sample was indexed as the cubic spinel structure. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicated that the particles were spherical with the particle sizes in the range of 15–20 nm. The magnetic properties of the sample were measured by using a superconducting quantum interference device (SQUID) magnetometer, which showed that the sample exhibited a typical superparamagnetic behavior at room temperature, while present finite coercivity of 353 Oe at 5 K.
Materials Letters. 62:1973-1975.
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ABSTRACT: Nanosized Zn0.6Cu0.4Cr0.5La0.04Fe1.46O4 ferrites were prepared by a rheological phase reaction method. Zn0.6Cu0.4Cr0.5La0.04Fe1.46O4/polypyrrole composites were prepared by in situ inverse microemulsion polymerization method. The structure, morphology, conductive and ferromagnetic property of ferrite powders and composites were characterized by powder X-ray diffractometer (XRD), transmission electron microscope (TEM), Fourier transform infrared (FTIR) spectra, four-probe instrument, and vibrating sample magnetometer (VSM). It was demonstrated that there was some interaction between the ferrite particles and PPy chains in the Zn0.6Cu0.4Cr0.5La0.04Fe1.46O4/PPy composites. The TEM showed that composites presented core-shell structure with a magnetic core of ferrite and an amorphous shell of PPy. The conductive magnetic properties of composites depended on the ferrite content. As the ferrite content increased from 10% to 30%, the conductivity decreased from 0.0423 to 0.0139 S/cm, while the saturation magnetization increased from 4.0 to 9.1 emu/g, and coercivity from 101.6 to 133.5 Oe, respectively. The bonding model for the composites was also studied.
Reactive and Functional Polymers 68(11):1587-1593. · 2.48 Impact Factor
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ABSTRACT: Conducting polymer/NiCr-ferrospinel nanocomposites were synthesized by in situ polymerization of aniline in the presence of NiCr0.5Fe1.5O4 nanoparticles via a reverse microemulsion route. The structure, morphology and magnetic properties of products were characterized by powder X-ray diffraction (XRD), infrared spectra, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and magnetic measurements. Structure and morphology analysis indicated that the NiCr0.5Fe1.5O4 particles with the crystallite size in the range of 12–18 nm were embedded in the polymer matrix. The magnetization under applied magnetic field for nanocomposites exhibited a clearly hysteretic behavior. The formation mechanism of nanocomposites was proposed as well.
Journal of Alloys and Compounds 487:735-738. · 2.29 Impact Factor
