Preparation and Properties of RE/Novel Polyamide Composite Fibers

2012 ◽  
Vol 627 ◽  
pp. 839-843 ◽  
Author(s):  
Bin Wang ◽  
Qing Xiu Jia ◽  
Guo Liang Zhao
Keyword(s):  
Lanthanide Complexes ◽  
Melt Spinning ◽  
Fluorescence Spectra ◽  
Composite Fibers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doping Technique ◽  
The Relationship ◽  
Rare Earth Content ◽  
Scanning Electron

Eu(TTA)3phen of Lanthanide complexes was synthesized, and the biobased aliphatic copolyamides (novel PA) were synthesized by condensing the biobased diacids and diamines. The luminescent europium composite fibers, Eu (TTA)3phen/bio-PA,were prepared by doping technique, and by using melt spinning method, we obtained Eu (TTA)3phen/novel PA composite fibers. The phase structure and the relationship between the fluorescence intensity of composite materials with added rare earth content were characterized by scanning electron microscopy, fluorescence spectra and X-ray diffraction.

Fluorescence Properties of Electrospun Bio-Based Polyamide/Eu(TTA)3phen Composite Fibers

2014 ◽  
Vol 941-944 ◽  
pp. 329-333
Author(s):  
Xiao Yang ◽  
Bin Wang ◽  
Qing Xiu Jia ◽  
Wan Xue Tian
Keyword(s):  
Fourier Transform ◽  
Rare Earth ◽  
Lanthanide Complexes ◽  
Structure And Properties ◽  
Composite Fibers ◽  
X Ray Diffraction ◽  
Fluorescent Intensity ◽  
X Ray ◽  
Electrospinning Method ◽  
Scanning Electron

In this paper, the bio-based aliphatic copolyamide (bio-based PA) was synthesized by bio-based diacids and diamines, and Eu (TTA)3phen of Lanthanide complexes was synthesized. Then bio-based polyamide/rare earth composite fibers were prepared by electrospinning method. The structure and properties of the electrospun composite fibers were characterized by fluorescence photometer, x-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR). The results showed that, with the increase of the content of rare earth, the fluorescent intensity of bio-based polyamide/rare earth composite fibers first increased, and then decreased. When the content of rare earth was 10%wt, the fluorescence property of the electrospun composites was best.

Luminescent PAN Fibers Doped with Tb3+ by Electrospinning

2013 ◽  
Vol 278-280 ◽  
pp. 448-451
Author(s):  
Dong Mei Zhao ◽  
Yu Hong Du ◽  
Tao Jiang ◽  
Xu Duo Bai ◽  
Hong Zhao
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Composite Fibers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron ◽  
Pan Fibers ◽  
Spun Fibers

In this study, monodispersed Tb3+ ions were successfully dispersed in the polyacrylonitrile (PAN) solution. Tb3+/PAN composite fibers were fabricated by electrospinning the PAN solutions containing different amount of Tb3+ ions. Further investigation showed that Tb3+ ions were homogeneously dispersed in the fibers individually. The composite fibers showed a uniform and continuous morphology. The as-spun fibers were characterized by Field Emission Scanning Electron Microscope (FE-SEM) and X-ray diffraction (XRD)

Melt Temperature Dependence on Glass Forming Ability of Al-Mg Alloys

2009 ◽  
Vol 79-82 ◽  
pp. 191-194
Author(s):  
Hao Ran Geng ◽  
Yan Bo Deng ◽  
Zhi Ming Wang ◽  
Xue Liang Wang ◽  
Zhen Yuan Li
Keyword(s):  
Melt Spinning ◽  
Liquid Structure ◽  
Glass Forming Ability ◽  
Dsc Analysis ◽  
X Ray Diffraction ◽  
Melt Temperature ◽  
X Ray ◽  
Glass Forming ◽  
The Relationship ◽  
Al Mg Alloys

The relationship between the viscosity of Al84Mg10Ce6 alloy melt and liquid structure was studied by viscosity measurements, X-ray diffraction and DSC analysis in this paper. In addition, the glass forming ability of alloy ties produced by melt spinning was analyzed. Based on the above results, the relationship between alloy melts and its glass forming ability(GFA)was studied. The addition of element Ce leads to the abnormal change of Al84Mg10Ce6 melt’ s structure and enhances its GFA, furthermore, it results in completely amorphous ties with melt spinning at 850°C.Therefore, there is certain relationship between the Al-Mg based alloys melt and its GFA.

Preparation, Characterization and Spectroscopy of Eu3+ in Gd2O3 Nanorods

2008 ◽  
Vol 8 (3) ◽  
pp. 1398-1403 ◽  
Author(s):  
Liqin Liu ◽  
En Ma ◽  
Renfu Li ◽  
Xueyuan Chen
Keyword(s):  
Electron Microscopy ◽  
Fluorescence Spectra ◽  
Filling Factor ◽  
Energy Levels ◽  
Diffraction Field ◽  
X Ray Diffraction ◽  
Excitation Spectra ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Eu3+:Gd2O3 nanorods were prepared by a hydrothermal method. X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, and Fourier transform-infrared spectroscopy were used to characterize the resulting samples. Emission and excitation spectra were studied using xenon excited spectroscopic experiments at 10 K. Energy transfer from Gd3+ to Eu3+, from the band gap of the host to Eu3+, and from Eu3+ (S6) to Eu3+ (C2) was observed. The energy levels of Eu3+ at the C2 site of cubic Gd2O3 were experimentally determined according to the fluorescence spectra at 10 K, and fit well with the theoretical values. The standard deviation for the optimal fit was 12.9 cm−1. The fluorescent lifetime of 5D0 (2.3 ms at 295 K) was unusually longer than that of the bulk counterparts (0.94 ms), indicating a small filling factor (0.55) for the nanorod volume. However the lifetime of 5D1 was much shorter than that of the bulk counterparts, 65 μs at 10 K, 37 μs at 295 K.

Preparation and Characterization TiO2 Aerogel Fibers

2013 ◽  
Vol 743-744 ◽  
pp. 434-437
Author(s):  
Miao Lv ◽  
Guo Tong Qin ◽  
Wei Wei
Keyword(s):  
Electron Microscopy ◽  
Pore Diameter ◽  
Supercritical Drying ◽  
Mass Ratio ◽  
Composite Fibers ◽  
X Ray Diffraction ◽  
Average Pore ◽  
X Ray ◽  
Adsorption Desorption ◽  
Scanning Electron

TiO2aerogel fibers have been fabricated by electron span combined supercritical drying technique. Polyvinylpyrrolidone (PVP)/TiO2composite fibers are prepared by electrospinning PVP and TiO2precursor Ti (OC4H9)4. TiO2aerogel fibers are obtained by supercritical drying PVP/TiO2composite fibers using ethanol as media. Structural of the aerogel fibers was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and N2adsorption at 77 K. The effect of mass ratio of PVP/TiO2was investigated. SEM shows that pore structure of nanofibers was well developed, with the diameter of nanofibers about 2 μm. N2adsorption/desorption data show that the highest surface area of aerogel fibers reached 241.6 m2/g with the average pore diameter about 10 nm. The aerogel fibers were anatase type TiO2.

Effect of Heat Treatment on the Microstructure and Creep Behavior of Mg-Sn-Ca Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 69-72 ◽  
Author(s):  
Tarek Abu Leil ◽  
Yuan Ding Huang ◽  
Hajo Dieringa ◽  
Norbert Hort ◽  
Karl Ulrich Kainer ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Creep Behaviour ◽  
Second Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Industrial Use ◽  
The Relationship ◽  
Thermal Stable ◽  
Scanning Electron

The development of new Mg-Sn based alloys that have shown improved corrosion resistance needs further investigations to develop standard alloys for industrial use. In the present study, the influence of heat treatment was investigated by examining the creep resistance of Mg-Sn and Mg-Sn-Ca alloys at 85 MPa under 135 °C identify the best conditions to improve the mechanical properties of such alloys. Additionally, the changes in microstructure of these alloys were studied and analysed by light microscopy, X-ray diffraction and scanning electron microscopy. It was found that the heat treatments can affect the microstructure of the binary alloy while no apparent change in the microstructure was found in the Mg-Sn-Ca alloys, indicating that the second phase CaMgSn is thermal stable in this alloy. Based on the obtained results, the relationship between the microstructure and creep behaviour are discussed.

Study on Recovery of Electrical Degradation of ZnO Varistors

2007 ◽  
Vol 350 ◽  
pp. 209-212 ◽  
Author(s):  
Hiroshi Yoshida ◽  
Masayuki Takada ◽  
Shinzo Yoshikado
Keyword(s):  
Crystal Structure ◽  
Optimum Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxygen Ions ◽  
Electrical Degradation ◽  
Long Time ◽  
Zno Varistors ◽  
The Relationship ◽  
Scanning Electron

The relationship between the crystal structure of Bi2O3 and the recovery of the electrical degradation of ZnO varistors was investigated. The evaluation methods used were analysis of the voltage-current (V-I) characteristics, scanning electron microscopy (SEM), energy-dispersion X-ray spectroscopy (EDX), and X-ray diffraction (XRD) measurements. The electrical degradation was estimated by the nonlinearity of the V-I characteristics. A marked recovery of the nonlinearity of the V-I characteristics was observed for a sample having the crystal structure of δ-type Bi2O3. It is speculated that the electrical degradation is markedly recovered for optimum conditions of both the amount and the crystal structure of the added Bi2O3, because, for samples sintered for a long time, the recovery speed is shorter than that for samples sintered for a shorter time. During long-time sintering, the amount of Bi2O3 decreased because of evaporation. No change of the crystal structure of Bi2O3 was observed upon repeated the electrical degradation and the recovery. It is suggested that another mechanism apart from the diffusion of oxygen ions through the grain boundaries of ZnO particles contributes to the electrical degradation and recovery of the nonlinearity of V-I characteristics.

Microstructural analysis for Sn-Bi-Sb-In alloy prepared by rapid solidification

2016 ◽  
Vol 12 (2) ◽  
pp. 4244-4254
Author(s):  
Sara Mosaad Mahlab ◽  
Mustafa Kamal ◽  
Abd El-Raouf Mansour
Keyword(s):  
Electron Microscopy ◽  
Microstructure Evolution ◽  
Melt Spinning ◽  
Vickers Microhardness ◽  
Microstructural Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rapidly Solidified ◽  
Melt Spinning Technique ◽  
Scanning Electron

In the present study, Sn70-X at.% -Bi15 at.% -Sb15 at.%- Inx at.%  alloy ( x= 0, 2, 4, 6),  were prepared by melt spinning technique. Optical microscopy, scanning electron microscopy combined with energy dispersive X-ray analysis (SEM-EDX), X-ray diffraction analysis (XRD), and Vickers microhardness (Hv); were used to characterize the phase transformation and the microstructure evolution. The results contribute to the understanding of the microstructure evolution in alloys of the type prepared by melt spinning technique. This work reports on a comparative study of the rapidly solidified, in order to compare the microhardness and microstructural analysis. 

Microstructural Development and Properties of (1-x) wt% Ba0.55Sr0.45TiO3-x wt% MgO Bulk Ferroelectrics

2001 ◽  
Vol 699 ◽  
Author(s):  
Costas G. Fountzoulas
Keyword(s):  
Solid State ◽  
Parallel Plate ◽  
Sol Gel ◽  
Microstructural Development ◽  
X Ray Diffraction ◽  
Parallel Plate Capacitor ◽  
X Ray ◽  
Dry Pressing ◽  
The Relationship ◽  
Scanning Electron

AbstractA study was made of the relationship between the microstructure and electrical properties of the bulk ferroelectric composite materials: (100-x) wt% Ba0.55Sr0.45TiO3-x wt% MgO. The ferroelectric composites (x= 40, 60) were fabricated by dry pressing from two powder precursors: 1) Ba0.55Sr0.45TiO3 (BST) calcined in the solid state with sol-gel MgO (Sg-MgO), and 2) hydrothermal BST and MgO calcined in the solid state. The pellets were sintered at 1250, 1350 and 1450°C. The sintered microstructure, chemistry, and phase with crystallinity was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and x-ray diffraction (XRD), respectively. The density and porosity were determined by the Archimedes technique. Dielectric properties of permittivity and loss tangent were characterized by the parallel plate capacitor method.

Mechanical and wear characteristic of Y-TZP/Al2O3 nanocomposites

2014 ◽  
Vol 66 (2) ◽  
pp. 209-214 ◽  
Author(s):  
Tianchang Hu ◽  
Yongsheng Zhang ◽  
Litian Hu
Keyword(s):  
Wear Resistance ◽  
Design Methodology ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Content Type ◽  
X Ray ◽  
Transmission Electron ◽  
Mild Wear ◽  
The Relationship ◽  
Scanning Electron

Purpose – The purpose of this paper is to investigate the mechanical and wear properties of Y-TZP/Al2O3 nanocomposites. Design/methodology/approach – In this paper, the Y-TZP/Al2O3 nanocomposites with different crystal-sizes are designed and fabricated by hot pressing. Their mechanical and anti-wear properties are investigated, and the wear mechanism is studied by scanning electron microscopy, X-ray diffraction, and transmission electron microscope and so on. Findings – The experimental results indicate that the wear of Y-TZP/Al2O3 nanocomposites can be divided into two regimes: mild wear regime and normal wear regime. In mild wear regimes, the relationship between wear resistance (ɛ) and hardness (H) of the material can be described as: ɛ−1∝H−1. The corresponding relationship among wear resistance, hardness and toughness (KIC) of the material in normal wear regime can be described as: ɛ−1∝H−1K IC −4. Originality/value – In this paper, the mechanical and anti-wear properties of Y-TZP/Al2O3 nanocomposites are systematically investigated. The relation between mechanical properties and wear resistance is revealed.

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