scholarly journals Synthesis and Characterization of Black CoFe2O4 Pigments Using MOOH (M = Fe and Co) Nanorod

2017 ◽  
Vol 62 (2) ◽  
pp. 1231-1234
Author(s):  
R. Yu ◽  
J. Yun ◽  
Y. Kim
Keyword(s):  
Solution Method ◽  
One Dimension ◽  
X Ray Diffraction ◽  
Substitution Method ◽  
Cobalt Ions ◽  
X Ray ◽  
Tetrahedral Sites ◽  
Cobalt Substitution ◽  
Divalent Cobalt

AbstractWe studied the coloration and phase transformation of various iron based pigment with cobalt substitution method and heat treatment. First, we synthesized well defined one dimensionβ-Fe/CoOOH nanorods using the solid solution method. Yellowishβ-Fe/CoOOH nanorods were transformed into reddish intermediate states and, finally, black CoFe2O4pigments was obtained. Divalent cobalt ions easily occupied tetrahedral sites. The prepared pigments were well characterized in terms of physical properties by using UV-vis, CIELabcolor parameter measurements, SEM (scanning electron microscopy) and XRD (powder X-ray diffraction). In addition, the magnetization property of the prepared CoFe2O4pigment was confirmed by VSM (vibrating sample magnetometer).

SYNTHESIS AND CHARACTERIZATION OF ZnO NANORODS AND NANOWIRES USING PVP AS CAPPING

2009 ◽  
Vol 08 (03) ◽  
pp. 285-287 ◽  
Author(s):  
M. ESKANDARI ◽  
V. AHMADI ◽  
Sh. AHMADI
Keyword(s):  
Solution Method ◽  
Zno Nanorods ◽  
Green Emission ◽  
Zno Nanowires ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical Solution Method ◽  
Air Atmosphere ◽  
20 Nm

In this study, ZnO nanowires are synthesized via ZnO nanorods at low temperature by using zinc acetate dehydrate and polyvinylpyrrolidone as precursor and capping, respectively. We use chemical solution method for synthesis of ZnO nanowires. Samples are characterized by means of scanning electron microscopy and X-ray diffraction. First, the nanorods are prepared at 300°C temperature, and then they are put into the furnace under air atmosphere at 450°C for 2 h. It is observed that nanowires with 20 nm diameter are produced. Photoluminescence spectra of nanorods and nanowires are compared. It shows that intensity of ultraviolet peak in the nanowires decreases but in contrast the intensity of green emission part increases. This is because, the surface effects such as oxygen vacancies increase in the structures of ZnO .

Preparation and Characterization of PCL/PVP Blend Membrane

2011 ◽  
Vol 311-313 ◽  
pp. 1638-1641
Author(s):  
Jun Hua Wang ◽  
Xiang Biao Cheng ◽  
Gang Huang ◽  
Feng Chun Dong ◽  
Yong Tang Jia
Keyword(s):  
Mechanical Property ◽  
Membrane Structure ◽  
Solution Method ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Blend Membrane ◽  
X Ray ◽  
Structure And Morphology ◽  
Xrd Techniques

PCL/PVP blend membrane was prepared by casting solution method. Scanning electron microscopy (SEM), diffraction scanning calorimetry (DSC), and X-ray diffraction (XRD) techniques were employed to characterize membrane structure and morphology. Moreover, the hydrophilicity, mechanical property and biodegradability of membranes were investigated. Due to introducing PVP, the crystallinity and mechanical property of PCL altered to some extent. The hydrophilicity of the blend membrane improved remarkably with increasing PVP content, which was expressed by the contact angle declining and the rate of water absorption increasing. Lipase accelerated the degradation rate of PCL/PVP membrane.

Synthesis and Characterization of CoFe2O4 Nanoparticles

2011 ◽  
Vol 261-263 ◽  
pp. 533-536 ◽  
Author(s):  
Zhen Feng Cui ◽  
Dehui Sun
Keyword(s):  
Solution Method ◽  
Size Range ◽  
Information Storage ◽  
Resonance Imaging ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Rhombohedral Crystal ◽  
Average Size

We synthesized the magnetic CoFe2O4nanoparticles using a solution method in the presence of hexamethylenetetramine (HMTA) at 85 °C for 6 h. Their morphologies, structures, surface properties and magnetism were characterized by Field emission scanning electron microscopy (FE-SEM) images, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and Vibrating sample magnetometer (VSM), respectively. FE-SEM results show that the synthesized samples are irregular nanoparticles with average size range of about 40-120 nm. XRD confirms that the samples belong to the rhombohedral crystal system. The magnetic CoFe2O4nanoparticles have the potential application in magnetic resonance imaging, high-density information storage and drug delivery.

Synthesis and characterization of three new rare-earth orthoborates: Ba2MgY2(BO3)4, Ba2CdY2(BO3)4, and Ba2CdSc(BO3)3

2020 ◽  
Vol 49 (31) ◽  
pp. 10874-10879
Author(s):  
Runqing Liu ◽  
Hongping Wu ◽  
Hongwei Yu ◽  
Zhanggui Hu ◽  
Jiyang Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Solution Method ◽  
Synthesis And Characterization ◽  
High Temperature Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Solution ◽  
First Time

Three rare-earth orthoborates Ba2MgY2(BO3)4, Ba2CdY2(BO3)4, and Ba2CdSc(BO3)3 were synthesized via a high-temperature solution method and their structures were determined by single crystal X-ray diffraction for the first time.

Mössbauer investigation of Co-doped Bismuth Ferrite prepared by the solution method

2021 ◽  
Author(s):  
Puyue Xia ◽  
Jiajun Mo ◽  
Weiyi Liu ◽  
Yanfang Xia ◽  
Min Liu
Keyword(s):  
Oxygen Vacancies ◽  
Solution Method ◽  
Bismuth Ferrite ◽  
Hyperfine Interactions ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
Cobalt Ions ◽  
X Ray ◽  
Modulated Structures ◽  
Structural Differences

In this work, [Formula: see text] ([Formula: see text] = 0, 0.08) nanoparticles were synthesized by the solution method and their structural differences were studied. X-ray diffraction results show that the rhombohedral R3c space group and perovskite structures are detected in both samples, accompanied by an impurity phase. The (104) and (110) peaks merge when cobalt ions are doped. The decrease in lattice parameters indicates that the microstructure of the nanoparticles becomes gradually distorted. Mössbauer spectroscopy analysis at room temperature reveals an additional doublet due to the oxygen vacancies in [Formula: see text]. Hyperfine interactions, spatial spin-modulated structures and oxygen deficiencies around iron ions are also reflected in the observed spectra and variations in hyperfine parameters.

scholarly journals Water-Driven Structural Transformation in Cobalt Trimesate Metal-Organic Frameworks

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4751
Author(s):  
Jayashree Ethiraj ◽  
Vinayagam Surya ◽  
Parasuraman Selvam ◽  
Jenny G. Vitillo
Keyword(s):  
Diffraction Pattern ◽  
Diffuse Reflectance ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Metal Organic ◽  
Divalent Cobalt

We report on the synthesis and the characterization of a novel cobalt trimesate metal-organic framework, designated as KCL-102. Powder X-ray diffraction pattern of KCL-102 is dominated by a reflection at 10.2° (d-spacing = 8.7 Å), while diffuse reflectance UV-Vis spectroscopy indicates that the divalent cobalt centers are in two different coordination geometries: tetrahedral and octahedral. Further, the material shows low stability in humid air, and it transforms into the well-known phase of hydrous cobalt trimesate, Co3(BTC)2·12H2O. We associated this transition with the conversion of the tetrahedral cobalt to octahedral cobalt.

Synthesis and Characterization of Magnetic NiFe2O4 Nanosheets

2011 ◽  
Vol 239-242 ◽  
pp. 2520-2523 ◽  
Author(s):  
Zhen Feng Cui ◽  
De Hui Sun
Keyword(s):  
Room Temperature ◽  
Solution Method ◽  
Energy Dispersive Spectrum ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Inverse Spinel ◽  
Cubic Crystal ◽  
X Ray ◽  
Composition And Structure

We have synthesized the magnetic NiFe2O4nanosheets using a solution method in the presence of hexamethylenetetramine (HMTA). Morphologies, composition and structure of the as-synthesized samples are characterized by field emission scanning electron microscopy (FE-SEM), energy dispersive spectrum (EDS) and X-ray diffraction (XRD), respectively. Fourier transform infrared (FTIR) spectroscopy and vibrating sample magnetometer (VSM) are used to investigate the surface properties and magnetic properties of the NiFe2O4nanosheets. FE-SEM results show that the NiFe2O4nanosheet samples have irregular shape with thickness of about 30 nm. XRD result confirms that the samples belong to the cubic crystal system with an inverse-spinel structure. The NiFe2O4nanosheets possess sub-ferromagnetism with a negligible coercivity and remanence at room temperature. It could become novel magnetic materials with the potential application in sensors, catalyst, and microwave devices.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

High Resolution Replication of Organoclay Surfaces

1982 ◽  
Vol 40 ◽  
pp. 576-577
Author(s):  
W. W. Barker ◽  
W. E. Rigsby ◽  
V. J. Hurst ◽  
W. J. Humphreys
Keyword(s):  
Clay Mineral ◽  
Organic Molecule ◽  
Organic Molecules ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Naturally Occurring ◽  
Silicate Layers ◽  
Mineral Identification

Experimental clay mineral-organic molecule complexes long have been known and some of them have been extensively studied by X-ray diffraction methods. The organic molecules are adsorbed onto the surfaces of the clay minerals, or intercalated between the silicate layers. Natural organo-clays also are widely recognized but generally have not been well characterized. Widely used techniques for clay mineral identification involve treatment of the sample with H2 O2 or other oxidant to destroy any associated organics. This generally simplifies and intensifies the XRD pattern of the clay residue, but helps little with the characterization of the original organoclay. Adequate techniques for the direct observation of synthetic and naturally occurring organoclays are yet to be developed.

Synthesis and characterization of TiN / Ti / AISI 410 coatings

2018 ◽  
Vol 2 (1) ◽  
pp. 7
Author(s):  
S Chirino ◽  
Jaime Diaz ◽  
N Monteblanco ◽  
E Valderrama
Keyword(s):  
Synthesis And Characterization ◽  
Photoemission Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Columnar Grains ◽  
Tin Thin Films ◽  
Steel Aisi ◽  
Interacting Surfaces ◽  
Stainless Steel Aisi

The synthesis and characterization of Ti and TiN thin films of different thicknesses was carried out on a martensitic stainless steel AISI 410 substrate used for tool manufacturing. The mechanical parameters between the interacting surfaces such as thickness, adhesion and hardness were measured. By means of the scanning electron microscope (SEM) the superficial morphology of the Ti/TiN interface was observed, finding that the growth was of columnar grains and by means of EDAX the existence of titanium was verified.  Using X-ray diffraction (XRD) it was possible to observe the presence of residual stresses (~ -3.1 GPa) due to the different crystalline phases in the coating. Under X-ray photoemission spectroscopy (XPS) it was possible to observe the molecular chemical composition of the coating surface, being Ti-N, Ti-N-O and Ti-O the predominant ones.

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