Synthesis of Nickel/Poly(aniline-Co-M-Toluidine) Composites and its Properties

2012 ◽  
Vol 627 ◽  
pp. 638-641
Author(s):  
Hong Wang ◽  
Xue Fei Li ◽  
Chang Sheng Luo
Keyword(s):  
Quantum Interference ◽  
Chemical Interaction ◽  
Oxidative Polymerization ◽  
Ammonium Persulfate ◽  
Ferromagnetic Behavior ◽  
Superconducting Quantum Interference Device ◽  
X Ray Diffraction ◽  
Ni Powder ◽  
Poly Aniline

Ni/poly(aniline-co-m-toluidine) nanocomposites were synthesized by in situ chemical oxidative polymerization of aniline with m-toluidine monomer in the presence of Ni powder, with ammonium persulfate (APS) as oxidant and citric acid (C6H8O7) as dopant. The structural, morphological and magnetic properties of these composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and superconducting quantum interference device magnetometer (SQUID). The results indicated that there is no chemical interaction between Ni powder and protonated copolymer, and Ni/poly(aniline-co-m-toluidine) nanocomposites displayed a ferromagnetic behavior with saturation magnetization strength and coercivity of 28.4emu/g and 105.8Oe at room temperature. The prepared composites were soft and ferromagnetic materials.

Preparation of Nickel/Poly(m-Toluidine) Composites and its Magnetic Properties

2012 ◽  
Vol 217-219 ◽  
pp. 142-145
Author(s):  
Hong Wang ◽  
Yong Zhong Jin ◽  
Tao Wang ◽  
Di Liu ◽  
Xue Fei Li
Keyword(s):  
Quantum Interference ◽  
Oxidative Polymerization ◽  
Ammonium Persulfate ◽  
Ferromagnetic Behavior ◽  
Superconducting Quantum Interference Device ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Ni Powder ◽  
Thermal Stability Of

Ni/poly(m-toluidine)(PMT) nanocomposites were prepared by in situ chemical oxidative polymerization of m-toluidine (MT) monomer in the presence of Ni powder, with ammonium persulfate (APS) as oxidant and citric acid (C6H8O7) as dopant. The resultant products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and superconducting quantum interference device magnetometer (SQUID). The results exhibited that Ni/PMT nanocomposites show a ferromagnetic behavior with saturation magnetization strength (Ms) and coercivity of 28.4emu/g and 105.8Oe at room temperature. The prepared Ni/PMT composites were soft and ferromagnetic materials. Moreover, thermal Stability of nanocomposites was also investigated.

Hydrothermal Synthesis and Room Temperature Ferromagnetism of Ni-Doped Rod-Like ZnO Particles

2014 ◽  
Vol 934 ◽  
pp. 71-74
Author(s):  
Lian Mao Hang ◽  
Zhao Ji Zhang ◽  
Zhi Yong Zhang
Keyword(s):  
Quantum Interference ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Hexagonal Wurtzite Structure ◽  
Ferromagnetic Behavior ◽  
Secondary Phases ◽  
Superconducting Quantum Interference Device ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zno Particles

Ni-doped rod-like ZnO particles with doping concentration of 1 at.% were synthesized at 200°C by hydrothermal method and characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and superconducting quantum interference device (SQUID). The results show that the as-synthesized samples are pure hexagonal wurtzite structure without metallic Ni or other secondary phases and display rod-like shape with smooth surface. The magnetization measurements reveal that the Ni-doped rod-like ZnO particles show ferromagnetic behavior at room temperature. The saturation magnetization and coercive field are 0.0046 emu/g and 15 Oe, respectively.

Preparation of Coral-Like α-Fe2O3 Nanostructures and Magnetic Properties

2011 ◽  
Vol 194-196 ◽  
pp. 625-628
Author(s):  
Hong Wang ◽  
Min Gong ◽  
Jing Yu Zhang
Keyword(s):  
Quantum Interference ◽  
Room Temperature ◽  
Magnetic Hysteresis ◽  
Ferromagnetic Behavior ◽  
Average Thickness ◽  
Solvothermal Process ◽  
Superconducting Quantum Interference Device ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Coral-like α-Fe2O3nanostructures modified by surfactant CTAB have been successfully obtained via a solvothermal process by using FeCl36H2O and oxalic acid as the starting materials. The coral-like α-Fe2O3nanostructures with good-crystalline consist of well-aligned α-Fe2O3nanoflakes with an average thickness of about 40 nm growing radially from the center of the nanostructures. The obtained products are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), superconducting quantum interference device magnetometer (SQUID). Magnetic hysteresis measurements indicate that coral-like α-Fe2O3superstructures show a normal ferromagnetic behavior with the remanence and coercivity of 0.2346emu/g and 1862Oe at room temperature. CTAB, the reaction temperature and solvent played an important role in controlling the final morphology of the products.

scholarly journals Synthesis of Polyaniline coated Graphene Oxide @ SrTiO3 Nanocube Nanocomposites for Enhanced Removal of Carcinogenic Dyes from Aqueous Solution

2016 ◽  
Author(s):  
Syed Shahabuddin ◽  
Norazilawati Muhamad Sarih ◽  
Muhammad Afzal Kamboh ◽  
Hamid Rashidi Nodeh ◽  
Sharifah Mohamad
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Graphene Oxide ◽  
Methyl Orange ◽  
Oxidative Polymerization ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Polymerization Method

The present investigation highlights the synthesis of polyaniline (PANI) coated graphene oxide doped with SrTiO3 nanocube nanocomposites through facile in-situ oxidative polymerization method for the efficient removal of carcinogenic dyes, namely, the cationic dye methylene blue (MB) and the anionic dye methyl orange (MO). The synthesised nanocomposites were characterised by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The adsorption efficiencies of graphene oxide (GO), PANI homopolymer and SrTiO3 nanocubes-doped nanocomposites were assessed by monitoring the adsorption of methylene blue and methyl orange dyes from aqueous solution. The adsorption efficiency of nanocomposites doped with SrTiO3 nanocubes were found to be of higher magnitude as compared with undoped nanocomposite. Moreover, the nanocomposite with 2 wt% SrTiO3 with respect to graphene oxide demonstrated excellent adsorption behaviour with 99% and 91% removal of MB and MO respectively, in a very short duration of time.

Structural and ferromagnetic properties of Cu-doped GaN

2007 ◽  
Vol 22 (5) ◽  
pp. 1396-1405 ◽  
Author(s):  
B. Seipel ◽  
R. Erni ◽  
Amita Gupta ◽  
C. Li ◽  
F.J. Owens ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Electron Gun ◽  
Superconducting Quantum Interference Device ◽  
X Ray Diffraction ◽  
Calcination Process ◽  
X Ray ◽  
Lattice Constants ◽  
Gan Crystal ◽  
Electron Energy Loss ◽  
Atomic And Electronic Structure

The wurtzite polymorph of GaN was calcined with CuO in flowing nitrogen. As a result of this processing, both superconducting quantum interference device magnetometry and ferromagnetic resonance studies showed ferromagnetism in these samples at room temperature. These magnetic results are qualitatively consistent with very recent first-principle calculations [Wu et al., Appl. Phys. Lett.89, 062505 (2006)] that predict ferromagnetism in Cu-doped GaN. We focus in this paper on analyzing changes in the GaN atomic and electronic structure due to calcination with CuO using multiple analytical methods. Quantitative powder x-ray diffraction (XRD) showed changes in the lattice constants of the GaN due to the incorporation of copper (and possibly oxygen). Energy-dispersive x-ray spectroscopy proved the incorporation of copper into the GaN crystal structure. Electron-gun monochromated electron energy loss spectroscopy showed CuO calcinations-induced GaN band gap changes and indicated changes in the atomic arrangements due to the calcination process. The fine structure of the N K-edge showed differences in the peak ratios with respect to higher nominal CuO contents, corresponding to an increase in the c-lattice constant as confirmed by XRD.

Effects of Rare Earth Y2O3 on the Microstructure and Wear Behaviors of Ti-6Al-4V Cladding with SiC

2018 ◽  
Vol 934 ◽  
pp. 89-94
Author(s):  
Yuan Ching Lin ◽  
Tzu Hsuan Wang
Keyword(s):  
Arc Welding ◽  
Wear Loss ◽  
X Ray Diffraction ◽  
Hardness Tester ◽  
Electron Probe Micro Analyzer ◽  
Gas Tungsten Arc ◽  
Ni Powder ◽  
Clad Layer ◽  
Pin On Disk

This study elucidates the effect of the percentage of Y2O3 on the microstructure and tribological performance of Ti-6Al-4V clad by SiC and Ni powder, using gas tungsten-arc welding (GTAW). The microhardness of the clad layer was measured using a Vickers hardness tester. The microstructure of the clad layer was analyzed using a scanning electron microscope (SEM) and an electron probe micro-analyzer (EPMA). X-ray diffraction (XRD) was used to determine the constituent phases of the clad layer. A pin-on-disk rotating tribometer was used to evaluate the wear resistance of the substrate and the clad layer. According to the experimental results, TiC and TiSi2 reinforcing phases were formed in situ in the clad layer during cladding process. The microhardness of the clad layer was two to three times that of the substrate, and the wear loss of the clad layer was about 51.5%~14.7% of that of the substrate. The optimal amount of Y2O3 enhanced the formation of TiC and TiSi2 and thus improved the microhardness of the clad layer. However, an amount of Y2O3 that over a critical value reduced the formation of reinforcing phases and degraded the mechanical properties of the clad layer.

A Facile Synthesis of Poly(3-octylthiophene)-Titanium Dioxide Nanocomposite Particles in Supercritical CO2

2008 ◽  
Vol 8 (9) ◽  
pp. 4743-4746 ◽  
Author(s):  
Haldorai Yuvaraj ◽  
Min Hee Woo ◽  
Eun Ju Park ◽  
Yeong-Soon Gal ◽  
Kwon Taek Lim
Keyword(s):  
Titanium Dioxide ◽  
Oxidative Polymerization ◽  
X Ray Diffraction ◽  
Photoluminescence Quenching ◽  
Tem Analysis ◽  
Ir Studies ◽  
Transmission Electron ◽  
Ft Ir ◽  
Synthesized Materials

Poly(3-octylthiophene) (P3OT)-titanium dioxide (TiO2) nanocomposite powder where TiO2 was embedded with homogeneous dispersion was synthesized by in-situ chemical oxidative polymerization of 3-octylthiophene in the presence of TiO2 nanoparticles in supercritical carbon dioxide (scCO2), using ferric chloride as the oxidant. The synthesized materials could be obtained as dry powder upon venting of CO2 after the polymerization. The composites were subsequently characterized by FT-IR spectroscopy, transmission electron microscopy (TEM), X-ray diffraction studies (XRD), thermogravimetric analysis (TGA) and photoluminescence (PL). The incorporation of TiO2 in the composite was endorsed by FT-IR studies. TGA revealed enhanced thermal stability of P3OT/TiO2 nanocomposite compared to 3-octylthiophene. TEM analysis showed that well dispersed TiO2 nanoparticles in the polymer matrix. Photoluminescence quenching increased with increasing TiO2 concentration in the composite.

scholarly journals Synthesis of Conductive PPy/SiO2Aerogels Nanocomposites byIn SituPolymerization of Pyrrole

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Daliana Muller ◽  
Geneviève K. Pinheiro ◽  
Tatiana Bendo ◽  
Alberto J. Gutiérrez Aguayo ◽  
Guilherme M. O. Barra ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Oxidative Polymerization ◽  
Cutoff Frequency ◽  
Conductive Polymer ◽  
Ammonium Persulfate ◽  
Morphological Properties ◽  
Covalent Bonds ◽  
Passive Components ◽  
Low Pass

Electrical conductive nanocomposite aerogels were synthesized throughin situoxidative polymerization of pyrrole (Py) using ammonium persulfate (APS) as an oxidizing agent in SiO2gels. The effect of Py concentration on the electrical conductivity and physical and morphological properties of aerogels SiO2/PPy was evaluated. B.E.T. analysis indicated that the surface area of the composite SiO2/PPy decreases with increasing concentration of Py. CHN analysis showed an increase in the amount of PPy, from 13 wt.% to 23 wt.%, with increasing concentration of pyrrole synthesis. FTIR-ATR analysis of the composites revealed bands in the region of 1500–1400 cm−1, indicating the presence of the conductive polymer in the silica aerogel as well as the characteristic bands of Si-O-Si and Si-OH covalent bonds. TEM micrographs revealed the presence of particles of PPy with the increased size of the nanoparticles. The composites were successfully applied as passive components, in RC circuits, for low-pass frequency filters. The filters exhibited a cutoff frequency at approximately 435 Hz. The aerogels obtained in this work exhibited suitable electrical conductivity for use in various other applications in electronics.

scholarly journals Structural and magnetic properties of mechanochemically synthesized nanosized yttrium titanate

2012 ◽  
Vol 66 (3) ◽  
pp. 309-315 ◽  
Author(s):  
Tanja Barudzija ◽  
Alexey Gusev ◽  
Dragana Jugovic ◽  
Milena Marinovic-Cincovic ◽  
Miroslav Dramicanin ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Single Phase ◽  
High Energy ◽  
Argon Atmosphere ◽  
Molar Ratio ◽  
Superconducting Quantum Interference Device ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Mean ◽  
First Time

Nanosized perovskite YTiO3 with the mean crystallite size of 18 nm was synthesized for the first time by mechanochemical treatment. The mechanochemical solid state reaction between commercial Y2O3 powder and mechanochemically synthesized TiO powder in molar ratio 0.5:1 was completed for 3 h in a high-energy planetary ball mill in argon atmosphere. The heating in vacuum at 1150 ?C for 12 h transforms nanosized YTiO3 to a well-crystallized single-phase perovskite YTiO3. Both samples were characterized by X-ray diffraction (XRD) and thermogravimetric (TGA/DTA) analyses, as well as superconducting quantum interference device magnetometer (SQUID) measurements.

Polyaniline/Layered Zirconium Phosphate Nanocomposites: Secondary-Like Doped Polyaniline Obtained by the Layer-by-Layer Technique

2008 ◽  
Vol 8 (4) ◽  
pp. 1782-1789 ◽  
Author(s):  
Celly M. S. Izumi ◽  
Vera R. L. Constantino ◽  
Marcia L. A. Temperini
Keyword(s):  
Inorganic Material ◽  
Resonance Raman Spectroscopy ◽  
Oxidative Polymerization ◽  
Free Charge Carrier ◽  
Resonance Raman ◽  
Layer By Layer ◽  
X Ray Diffraction ◽  
Lbl Assembly ◽  
Aniline Polymerization

In the present work, nanocomposites of polyaniline (PANI) and layered α-Zr(HPO4)2˙H2O (α-ZrP) were prepared using two different approaches: (i) the in situ aniline polymerization in the presence of the layered inorganic material and (ii) the layer-by-layer (LBL) assembly using an aqueous solution of the polycation emeraldine salt (ES-PANI) and a dispersion of exfoliated negative slabs of α-ZrP. These materials were characterized spectroscopically using mainly resonance Raman scattering at four exciting radiations and electronic absorption in the UV-VIS-NIR region. Structural and textural characterizations were carried out using powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The polymer obtained by the in situ aniline polymerization is located primarily in the external surface of the inorganic material although aniline monomers were intercalated between α-ZrP interlayer regions before oxidative polymerization. Through resonance Raman spectroscopy, it was observed that the formed polymer has semiquinone units (ES-PANI) and also azo bonds (—N=N—), showing that this method results in a polymer with a different structure from the usual “head-to-tail” ES-PANI. The LBL assembly of pre-formed ES-PANI and exfoliated α-ZrP particles produces homogeneous films with reproducible deposition from layer to layer, up to 20 bilayers. Resonance Raman (λ0 = 632.8 nm) spectrum of PANI/ZrP LBL film shows an enhancement in the intensity of the polaronic band at 1333 cm–1 (νC—N˙+) and the decrease of the band intensity at 1485 cm–1 compared to bulk ES-PANI. Its UV-VIS-NIR spectrum presents an absorption tail in the NIR region assigned to delocalized free charge carrier. These spectroscopic features are characteristic of highly conductive secondary doped PANI suggesting that polymeric chains in PANI/ZrP LBL film have a more extended conformation than in bulk ES-PANI.

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