Chemical synthesis of nanoparticles for artificial pinning centers in YBCO coated conductors

2005 ◽  
Vol 868 ◽  
Author(s):  
Srivatsan Sathyamurthy ◽  
Keith J. Leonard ◽  
M. Parans Paranthaman
Keyword(s):  
Coated Conductors ◽  
Ceria Nanoparticles ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Pinning Centers ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Artificial Pinning Centers ◽  
Transmission Electron ◽  
Ybco Coated Conductors

AbstractCeria nanoparticles were prepared using a solution based approach using cerium (III) acetate as a starting material and cetyltrimethylammonium hydroxide (CTAOH) as a precipitating agent and surfactant. The presence of the surfactant CTAOH helps prevent agglomeration of the nanoparticles. Using X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM), the particle size was determined to be 3.5 – 4 nm. The structure and properties of these CeO2 nanoparticles have been analyzed.

Mangnese Dioxide Nano-Crystal as Catalyst to Remove Formaldehyde

2011 ◽  
Vol 298 ◽  
pp. 147-152 ◽  
Author(s):  
Wei Shao ◽  
Xiu Juan Chu ◽  
Kai Gao ◽  
Hua Zhang
Keyword(s):  
Hot Spot ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Formaldehyde Oxidation ◽  
Nano Crystal ◽  
Liquid Precipitation ◽  
Scanning Electron ◽  
Better Than

The purification technology and material of indoor formaldehyde is a hot spot in the field of material at present. In this paper, MnSO4, KMnO4, NaOH and H2O2 etc. are used to make manganese dioxide nanocrystal with the method of liquid precipitation. X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM) were used to characterize the structure and properties. The results show that the products are nano-crystals of γ- MnO2 and δ-MnO2. The catalyze oxidation of formaldehyde using bothγ- MnO2 and δ-MnO2 as catalysts was investigated; and acetyl acetone method was used to characterize formaldehyde chroma. The catalytic ability ofγ-MnO2 nanocrystal to catalyze formaldehyde oxidation is better than that ofδ-MnO2.

Investigation of Structure and Properties of the Al–Y–Ni–Co–Cu Metallic Glasses

2002 ◽  
Vol 17 (5) ◽  
pp. 1014-1018 ◽  
Author(s):  
Dmitri V. Louzguine ◽  
Akihisa Inoue
Keyword(s):  
Electron Microscopy ◽  
Metallic Glasses ◽  
Crystallization Behavior ◽  
Supercooled Liquid ◽  
Partial Replacement ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron

The present paper reports the effect of partial replacement of Ni by Cu in the Al85Y8Ni5Co2 alloy. The studied alloys were produced by rapid solidification. Glass-formation, crystallization behavior, and stability of the supercooled liquid were studied by x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. Partial replacement of Ni by Cu in the Al85Y8Ni5Co2 metallic glass caused formation of the nanoscale α–Al particles and resulted in a decrease in the crystallization temperature and disappearance of the supercooled liquid.

Investigation on structure of BaTi1−x NbxO3 compound prepared by rotary-hydrothermal synthesis methods

2014 ◽  
Vol 32 (3) ◽  
pp. 430-435 ◽  
Author(s):  
Arsia Khanfekr ◽  
Morteza Tamizifar ◽  
Rahim Naghizadeh
Keyword(s):  
Electron Microscope ◽  
Hydrothermal Reaction ◽  
Phase Evolution ◽  
Synthesis Methods ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Patterns

AbstractBaTi1−x NbxO3 compounds (with x = 0.0, 0.01, 0.03, 0.06, and 0.09) were synthesized by rotary-hydrothermal (RH) method. The process was conducted at 180 °C for 5 hours in a Teflon vessel that was rotated at a speed of 160 rpm during the hydrothermal reaction. The effects of donor concentration on the structure and properties of BaTi1−x NbxO3 compounds were investigated. The experiments for the BaTiO3±Nb2O3 system produced by a solid state reaction at high temperature at different concentrations of niobium, with the use of RH processing have not been reported in previous works. For the phase evolution studies, X-ray diffraction patterns (XRD) were analyzed and Raman spectroscopy measurements were performed. The transmission electron microscope (TEM) and the field emission scanning electron microscope (FE-SEM) images were taken for the detailed analysis of the grain size, surface and morphology of the compound.

scholarly journals Green Synthesis, Characterization and Antibacterial Study of Ag-Au Bimetallic Nanocomposite using Tea Powder Extract

2020 ◽  
Vol 11 (1) ◽  
pp. 8087-8095
Keyword(s):  
Green Synthesis ◽  
Biological Behavior ◽  
X Ray Diffraction ◽  
Antibacterial Study ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Transmission Electron ◽  
Silver Sample ◽  
Bimetallic Nanocomposite ◽  
Tea Extract

Synthesis of metal nanoparticles using plant extracts is attracted much to the recent researchers due to its simplicity, which integrates chemical technology. Special attention is given to the green synthesis of nanoparticles by easily available plants with an eco-friendly system compared to other conventional methods. Silver-Gold nanocomposite (Ag-Au NCp’s) is synthesized by bi reduction of silver nitrate and gold chloride. These metal salts are simultaneously reduced by tea extract to form respective silver and gold nanocomposite. The structure and morphology of as-prepared Ag-Au NCp’s sample were characterized by employing powder X-ray diffraction (XRD) tool and by Scanning Electron Micrograph (SEM) tool, respectively. Fourier Transform Infrared (FTIR) spectral study was undertaken to know the bonding in the prepared silver sample. Morphology and particle size of the above composite was studied by the Transmission electron microscope (TEM) tool. Energy-dispersive X-ray analysis (EDX) study was undertaken to know the formation of Ag-Au NCp’s. Antibacterial activity study is undertaken to know its biological behavior.

Influence of cooling rate on the structure and properties of a Cu–Zr–Ti–Ag glassy alloy

2008 ◽  
Vol 23 (2) ◽  
pp. 515-522 ◽  
Author(s):  
Dmitri V. Louzguine-Luzgin ◽  
Takanobu Saito ◽  
Junji Saida ◽  
Akihisa Inoue
Keyword(s):  
Cooling Rate ◽  
Vickers Microhardness ◽  
Glassy Alloy ◽  
Cooling Curve ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Relaxation ◽  
Transmission Electron ◽  
Nanoscale Clusters

The influence of the cooling rate on the structure, microhardness, relaxation, and devitrification behavior of Cu44Ag15Zr36Ti5 glassy alloy on heating is studied in the present work. According to transmission electron microscopy investigations, the structures of Cu44Ag15Zr36Ti5 glassy ribbon and bulk samples are somewhat different. The structure of the ribbon samples is amorphous while, the nanoscale clusters of the crystalline phase (highly ordered regions) are formed in the bulk samples. It is reflected in the shift of the x-ray diffraction peak, in the magnitude of the heat of structure relaxation and crystallization, as well as in the change in the Vickers microhardness. An analysis of the cooling curve is also performed.

Structure and Properties of BR Nanocomposites Reinforced with Organoclay

2005 ◽  
Vol 13 (4) ◽  
pp. 371-384 ◽  
Author(s):  
Shaohui Wang ◽  
Zonglin Peng ◽  
Yong Zhang ◽  
Yinxi Zhang
Keyword(s):  
Electron Microscopy ◽  
Ammonium Salts ◽  
Butadiene Rubber ◽  
Structure And Properties ◽  
Reinforcement Effect ◽  
X Ray Diffraction ◽  
Melt Mixing ◽  
Elongation At Break ◽  
X Ray ◽  
Transmission Electron

Butadiene rubber (BR)/organoclay nanocomposites were prepared by direct melt mixing of BR and clay modified with different primary and quaternary ammonium salts. BR/pristine clay composite and BR/organoclay nanocomposites were analysed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and thermogravimetric analysis. The vulcanization characteristics and the mechanical properties of the BR/pristine clay and BR/organoclay composites were investigated. The results showed that the interlayer distance of the organoclays was expanded, which indicated that intercalated BR/organoclay nanocomposites had been prepared. Organoclay effectively accelerated the vulcanization of BR, which was attributed to the intercalatant used to modify the clay. The tensile strength, elongation at break and tear strength of BR/organoclay nanocomposites are much higher than those of gum BR vulcanizate and BR/pristine clay composites. The organoclay modified with dimethyl dihydrogenated tallow ammonium chloride (DDAC) gave the best reinforcement effect in BR of all the organoclays.

scholarly journals Microstructure and superconducting properties of high-rate PLD-derived GdBa2Cu3O7−δ coated conductors with BaSnO3 and BaZrO3 pinning centers

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Alexey V. Ovcharov ◽  
Pavel N. Degtyarenko ◽  
Vsevolod N. Chepikov ◽  
Alexander L. Vasiliev ◽  
Sergey Yu. Gavrilkin ◽  
...  
Keyword(s):  
Critical Current ◽  
Scanning Transmission Electron Microscopy ◽  
Average Length ◽  
Average Diameter ◽  
Coated Conductors ◽  
High Rate ◽  
Pinning Centers ◽  
Artificial Pinning Centers ◽  
Transmission Electron ◽  
Scanning Transmission

Abstract The microstructure of GdBa2Cu3O7−δ based on superconducting tapes with BaSnO3 and BaZrO3 artificial pinning centers formed by high-rate pulse laser deposition in SuperOx Japan was studied by scanning/transmission electron microscopy. The artificial pinning centers have adopted columnar morphology with average diameter of about 8 nm (BaSnO3-doped sample) and 6.5 nm (BaZrO3-doped sample) and density of 500 μm−2 for the both samples. The average length of the BaSnO3 nanocolumns is about two times higher than the BaZrO3 nanocolumns. The angular dependences of critical current in magnetic field up to 1 Tesla at 77 and 65 K have been obtained. The critical current and its anisotropy depend on artificial pinning centers presence and their type. The angular dependence of resistivity in the field up to 9 Tesla was also studied and discussed.

Texture Analysis of Coated Conductors by Micro-Raman and Synchrotron x-ray Diffraction

2000 ◽  
Vol 659 ◽  
Author(s):  
Teresa Puig ◽  
Anna Puig-Molina ◽  
Narcís Mestres ◽  
Harm Van Seijen ◽  
Francesc Alsina ◽  
...  
Keyword(s):  
Texture Analysis ◽  
Coated Conductors ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
Superconducting Layer ◽  
X Ray ◽  
Transmission Geometry ◽  
Non Destructive ◽  
Ybco Coated Conductors

ABSTRACTTwo novel complementary and non-destructive techniques for texture analysis of YBCO coated conductors are presented. Micro-Raman (μ-Raman) spectroscopy enables an easy analysis of the film homogeneity by determining the distribution of a- and c-oriented grains within the tape with a 1 μm spatial resolution and acquisition times of 5 min/spot. In addition, synchrotron x-ray diffraction analysis in transmission geometry and 2D detectors enables, with acquisition times of 100 ms, simultaneous observation of a- and c- crystallites and in-plane textures of substrates, buffers and superconducting layer. Thus, opening the field of this technique to in-situ analysis of epitaxial growth of coated conductors prepared by ex-situ processes. Results from these two techniques for stainless steel tapes buffered with IBAD-YSZ and coated with PLD-YBCO are analyzed.

scholarly journals EFFECT OF TEMPERATURE ON THE STRUCTURE AND PROPERTIES OF Fe2O3/GRAPHENE NANOCOMPOSITES SYNTHESIZED BY HYDROTHERMAL METHOD

2019 ◽  
Vol 57 (3A) ◽  
pp. 150
Author(s):  
Khai Tran Van ◽  
Vinh Nguyen Quang ◽  
Thang Le Van ◽  
Phong Mai Thanh
Keyword(s):  
Hydrothermal Reaction ◽  
Graphene Nanosheets ◽  
Effect Of Temperature ◽  
Fe2o3 Nanoparticles ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Graphene Nanocomposites ◽  
X Ray ◽  
Transmission Electron ◽  
Straightforward Approach

A simple and straightforward approach was used to prepare Fe2O3/graphene nanocomposites with different temperature conditions. The nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and photoluminescence (PL). The results show that Fe2O3 nanoparticles with size in range of 60-100 nm are anchored on the surface and filled between the graphene nanosheets at hydrothermal reaction. The PL spectrum exhibits the emission peaks appeared at ~ 650 nm and ~ 720 nm.

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