Solvothermal route to Bi3Se4 nanorods at low temperature

2001 ◽  
Vol 16 (12) ◽  
pp. 3361-3365 ◽  
Author(s):  
Yuan-fang Liu ◽  
Jing-hui Zeng ◽  
Wei-xin Zhang ◽  
Wei-chao Yu ◽  
Yi-tai Qian ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Reaction Mechanism ◽  
Low Temperature ◽  
Hydrazine Hydrate ◽  
Photoelectron Spectra ◽  
Elemental Selenium ◽  
X Ray ◽  
Transmission Electron ◽  
Microscope Images ◽  
Diffraction Patterns

Nanorods Bi3Se4 were synthesized directly through the reaction between BiCl3 and elemental selenium in an autoclave with hydrazine hydrate as solvent at 165 °C for 10 h. X-ray powder diffraction patterns, x-ray photoelectron spectra, and transmission electron microscope images show that the products are well-crystallized hexagonal Bi3Se4 nanorods. The solvent hydrazine hydrate played an important role in formation and growth of Bi3Se4 nanorods. The possible reaction mechanism was proposed.

Microcharacterization of Heterogeneous Specimens Containing Tire Dust

1999 ◽  
Vol 589 ◽  
Author(s):  
Marina Camatini ◽  
GAI M Corbetta ◽  
Giovanini F Crosta ◽  
Tigran Dolukhanyan ◽  
Giampaolo Giuiani ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Analytical Electron Microscopy ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Debris Particles ◽  
Microscope Images ◽  
Analytical Electron ◽  
Diffraction Patterns

AbstractThis work is focused on dust or debris produced by the wear of tire tread. Two problems are addressed, which are solved by analytical electron microscopy (AEM): characterization of tire debris and identification of tire debris particles in a heterogeneous specimen. The characteristic morphology, microstructure and elemental composition of tire debris can all be determined by AEM. The scanning electron microscope (SEM) shows that the surface of a tire debris particle has a typical, warped structure with pores. The characteristic elements of tire rubber are S and Zn, which are detected by energy dispersive X ray (EDX) spectroscopy. The identification of rubber particles in heterogeneous debris containing talc and produced by a laboratory abrader is possible by the analytical SEM. Transmission electron microscope images, EDX spectra and selected area electron diffraction patterns characterize tire debris at the sub–micron scale, where the material can no longer be treated as homogeneous.

Biological X-ray Microanalysis: The Past, Present Practices, and Future Prospects

2001 ◽  
Vol 7 (2) ◽  
pp. 211-219 ◽  
Author(s):  
Patrick Echlin
Keyword(s):  
Electron Microscope ◽  
Low Temperature ◽  
Transmission Electron Microscope ◽  
Low Voltage ◽  
High Energy ◽  
Scanning Transmission Electron Microscope ◽  
X Ray ◽  
Ambient Temperatures ◽  
Advantages And Disadvantages ◽  
Transmission Electron

Abstract A brief description is given of the events surrounding the development of biological X-ray microanalysis during the last 30 years, with particular emphasis on the contribution made by research workers in Cambridge, UK. There then follows a broad review of some applications of biological X-ray microanalysis. A more detailed consideration is given to the main thrust of current procedures and applications that are, for convenience, considered as four different kinds of samples. Thin frozen dried sections which are analyzed at ambient temperatures in a transmission electron microscope (TEM); semithin frozen dried sections which are analyzed at low temperature in a scanning transmission electron microscope (STEM); thick frozen hydrated sections which are analyzed at low temperature in a scanning electron microscope (SEM), and bulk samples which are analyzed at low temperature in the same type of instrument. A brief outline is given of the advantages and disadvantages of performing low-voltage, low-temperature X-ray microanalysis on frozen hydrated bulk biological material. The article concludes with a consideration of alternative approaches to in situ analysis using either high-energy beams or visible and near-visible photons.

scholarly journals Preparation of red and grey elemental selenium for food fortification

2021 ◽  
Author(s):  
B. Khandsuren ◽  
J. Prokisch
Keyword(s):  
Electron Microscope ◽  
Sodium Selenite ◽  
Food Science ◽  
Elemental Selenium ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hexagonal Form ◽  
Transmission Electron ◽  
Particle Size Analyzer ◽  
Wide Range

AbstractIn recent years, the importance of nanomaterials in food science, medicine, etc. has been increasing quickly. Herein, organic and inorganic red selenium nanoparticles synthesised by the reduction of sodium selenite with chemical and biological reducing agents. Grey hexagonal form in aqueous and powder was assembled at a high temperature of 85 °C for 10 min. Also, selenium enriched yogurt powder was made that contained about 2,000 mg kg−1 selenium, 93.8% of which is in nano form with a size of 50–500 nm. The synthesised nanoparticles were characterised by Dynamic Light Scattering Particle Size Analyzer (DLS), X-ray Diffraction Analysis (XRD), Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). The prepared SeNPs could be promising additive for a wide range of applications.

Preparation and phase control of nanocrystalline silver indium sulfides via a hydrothermal route

2001 ◽  
Vol 16 (12) ◽  
pp. 3411-3415 ◽  
Author(s):  
J. Q. Hu ◽  
B. Deng ◽  
K. B. Tang ◽  
C. R. Wang ◽  
Y. T. Qian
Keyword(s):  
Room Temperature ◽  
Photoelectron Spectra ◽  
Hydrothermal Route ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
And Control ◽  
Microscopy Images ◽  
Room Temperature Raman Spectrum ◽  
Weak Peak

A hydrothermal route was proposed to prepare and control nanocrystalline silver indium sulfides (orthorhombic AgInS2, tetragonal AgInS2, and cubic AgIn5S8). The reaction was carried out in an autoclave in the temperature range of 100–280 °C with AgCl, InCl3, and thiourea as reactants. X-ray powder diffraction patterns and transmission electron microscopy images showed that the products were AgInS2 and AgIn5S8 phases and well crystallized with grain diameter in the range of 20–70 nm. X-ray photoelectron spectra of the single AgIn5S8 phase revealed the surface stoichiometry (AgIn5.05S8.11), and its room temperature Raman spectrum showed a strong peak at 130 cm−1 and a weak peak at around 290 cm−1. The influence of reaction temperature on the phases in the final products was investigated. A possible reaction mechanism of the formation of silver indium sulfides was also briefly discussed.

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.

Determine the Three-Dimensional Crystallographic Misorientation in Heterostructures by Selected Area Diffraction (SAD) in TEM

2000 ◽  
Vol 618 ◽  
Author(s):  
X. J. Guo ◽  
C.-Y. Wen ◽  
J. H. Huang ◽  
H. C. Shih
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Diffraction Pattern ◽  
Transmission Electron Microscope ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Heteroepitaxial Structures ◽  
Transmission Electron ◽  
Microscope Images ◽  
Diffraction Patterns

ABSTRACTWe proposed a concise and novel scheme to determine the crystallographic misorientation of heteroepitaxial structures. In addition to subtle high-resolution transmission electron microscope images, the information revealed from selected-area diffraction patterns at the interfaces offers another path to determine the angles of misorientations. The principle is to extract the basically three-dimensional misorientation information from a two-dimensional selected-area diffraction pattern through the employment of the Laue circle

Low temperature interface-mineralizing route to hollow CuS, CdS, and NiS spheres

2002 ◽  
Vol 80 (3) ◽  
pp. 263-268 ◽  
Author(s):  
Xuchuan Jiang ◽  
Yi Xie ◽  
Jun Lu ◽  
Liying Zhu ◽  
Wei He ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Low Temperature ◽  
Hollow Sphere ◽  
Aqueous Ammonia ◽  
Metal Sulfides ◽  
X Ray ◽  
Functional Roles ◽  
Absorption And Fluorescence Spectroscopy ◽  
Transmission Electron

Submicrometer hollow CuS, CdS, and NiS spheres with diameters between 400 and 1300 nm were successfully prepared through an interface-mineralizing reaction in a NH3·H2O–CS2 solution at low temperature. Several techniques were applied to characterize the interesting self-assembled structures. The compositions of the prepared CuS, CdS, and NiS materials were confirmed by X-ray powder diffraction (XRD), the surface atomic ratios and the valence state of ions were examined by X-ray photoelectron energy spectroscopy (XPS), and the morphologies of products by transmission electron microscope (TEM). The optical properties, including absorption and emission, were recorded by UV–vis absorption and fluorescence spectroscopy, respectively. In this approach, ethylenediamine (en) was substituted by aqueous ammonia (NH3·H2O) to avoid violent reactions with carbon disulfide (CS2). The main advantage to this approach is that both ammonia and CS2 played multi-functional roles in the assembly of hollow-sphere structures. The reaction sources themselves (CS2) served as the reaction template and required no other templates to support it. The proposed interface-mineralizing mechanism is discussed, and the hollow-sphere structures obtained are envisioned to have applications in area of materials science.Key words: hollow-sphere structure, NH3·H2O–CS2, metal sulfides

The Effect of Ag-Addition on Crystal Structure of β'-Phase in Al-Mg-Si Alloy

2006 ◽  
Vol 519-521 ◽  
pp. 511-514 ◽  
Author(s):  
Junya Nakamura ◽  
Kenji Matsuda ◽  
Yoshio Nakamura ◽  
Tatsuo Sato ◽  
Susumu Ikeno
Keyword(s):  
Crystal Structure ◽  
Electron Microscope ◽  
High Resolution ◽  
Metastable Phase ◽  
Ag Addition ◽  
X Ray ◽  
Β Phase ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Diffraction Patterns

The purpose of this study is identity the crystal structure of metastable phase in Ag added Al-Mg-Si alloy by comparing the β’-phases in Al-Mg-Si alloy without Ag, using images of high resolution transmission electron microscope (HRTEM), selected area electron diffraction patterns (SADPs) and an energy dispersive X-ray spectroscopy (EDS). The result of SADPs and HRTEM images have been simulated and compared with images and SADPs obtained from actual precipitates. SADPs and HRTEM images obtained from metastable phase in the Ag added Al-Mg-Si alloy showed similar to those of β’-phase in Al-Mg-Si alloy without Ag and had different lattice spacings because of the effect of Ag.

Sonochemical Synthesis of Nanocrystalline MgSeO3 and its Photocatalysis Behavior

2011 ◽  
Vol 284-286 ◽  
pp. 829-832
Author(s):  
Xue Jun Gu ◽  
Da Wei Fang ◽  
Yu Liu ◽  
Qiang Wang ◽  
Shu Liang Zang
Keyword(s):  
Electron Microscope ◽  
Organic Acid ◽  
Powder Diffraction ◽  
Transmission Electron Microscope ◽  
Sonochemical Synthesis ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Patterns

Nanocrystalline MgSeO3 was synthesized by method of ultrasonic precipitation, and was determined by X-ray powder diffraction patterns and transmission electron microscope. Photocatalyst behavior of MgSeO3 has been studied by decomposing organic acid black dye.

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