scholarly journals A Computer-Vision-Guided Robot Arm for Automatically Placing Grids in Pioloform Film Preparation

2019 ◽  
Vol 2 (1) ◽  
pp. 9 ◽  
Author(s):  
Markus Peurla ◽  
Pekka Hänninen ◽  
Eeva-Liisa Eskelinen
Keyword(s):  
Electron Microscopy ◽  
Computer Vision ◽  
Transmission Electron Microscopy ◽  
Current Practice ◽  
Low Cost ◽  
Routine Laboratory ◽  
Robot Arm ◽  
Laboratory Procedure ◽  
Transmission Electron ◽  
Film Preparation

Preparing pioloform/formvar support films on transmission electron microscopy (TEM) grids is a routine laboratory procedure in practically all electron microscopy units. In current practice, these grids are manually placed on the support film one by one using special tweezers, a process requiring a steady hand. The work is often ergonomically awkward to continue for a longer period of time. In this article, we describe a low-cost, computer vision-guided robot arm that automatically places the grids on the film. The success rate of the prototype robot is 90%, which is comparable to an experienced laboratory technician.

Transmission Electron Microscopy of oriented Co84Cr14Ta2 thin films for longitudinal magnetic recording

1991 ◽  
Vol 49 ◽  
pp. 756-757
Author(s):  
T. P. Nolan
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Low Cost ◽  
Low Noise ◽  
Information Storage ◽  
High Coercivity ◽  
Magnetic Alloy ◽  
Magnetic Media ◽  
Transmission Electron

Thin film magnetic media are being used as low cost, high density forms of information storage. The development of this technology requires the study, at the sub-micron level, of morphological, crystallographic, and magnetic properties, throughout the depth of the deposited films. As the microstructure becomes increasingly fine, widi grain sizes approaching 100Å, the unique characterization capabilities of transmission electron microscopy (TEM) have become indispensable to the analysis of such thin film magnetic media.Films were deposited at 225°C, on two NiP plated Al substrates, one polished, and one circumferentially textured with a mean roughness of 55Å. Three layers, a 750Å chromium underlayer, a 600Å layer of magnetic alloy of composition Co84Cr14Ta2, and a 300Å amorphous carbon overcoat were then sputter deposited using a dc magnetron system at a power of 1kW, in a chamber evacuated below 10-6 torr and filled to 12μm Ar pressure. The textured medium is presently used in industry owing to its high coercivity, Hc, and relatively low noise. One important feature is that the coercivity in the circumferential read/write direction is significandy higher than that in the radial direction.

Characterization and their Fluorescence of Fe3+-Doped La2Zr2O7 Nanocrystals by a Salt-Assistant Combustion Method

2011 ◽  
Vol 306-307 ◽  
pp. 1257-1261 ◽  
Author(s):  
Yun Shan Bai ◽  
Lu De Lu ◽  
Jian Chun Bao
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Solid Solutions ◽  
Low Cost ◽  
Combustion Process ◽  
Combustion Method ◽  
Crystal Form ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
Transmission Electron

Nanocrystalline Fe3+-doped La2Zr2O7 series solid solutions were prepared by a convenient salt-assisted combustion process using glycine as fuel. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The results showed the La ion can be partially replaced by Fe ion. The partial substituted products were still single-phase solid solutions and the crystal form remained unchanged. TEM images reveal that the products are composed of well-dispersed square-shaped nanocrystals. The method provides a convenient and low-cost route for the synthesis of nanostructures of oxide materials. The fluorescence of La1.8Fe0.2Zr2O7 nanocrystals was evaluated by the UV-visible absorption spectra and the fluorescence spectra. The results indicate that (LaxFe1-x)2Zr2O7 nanocrystals prepared by this method are a kind of potential fluorescent-emitted material.

Low-Cost, Atmospheric-Pressure Scanning Transmission Electron Microscopy

2011 ◽  
Vol 19 (3) ◽  
pp. 16-20
Author(s):  
Niels de Jonge ◽  
Elisabeth A. Ring ◽  
Wilbur C. Bigelow ◽  
Gabriel M. Veith
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Atmospheric Pressure ◽  
Low Cost ◽  
High Vacuum ◽  
Nanoscale Systems ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Thin Electron

Solid materials in subambient gaseous environments have been imaged using in situ transmission electron microscopy (TEM), for example to study dynamic effects: carbon nanotube growth, nanoparticle changes during redox reactions, and phase transitions in nanoscale systems. In these studies the vacuum level in the specimen region of the electron microscope was increased to pressures of up to 10 mbar using pump-limiting apertures that separated the specimen region from the rest of the high-vacuum electron column, but it has not been possible to achieve the higher pressures that are desirable for catalysis research. TEM imaging at atmospheric pressure and at elevated temperature was achieved with 0.2-nm resolution by enclosing a gaseous environment several micrometers thick between ultra-thin, electron transparent silicon nitride windows. Although Ångström-level resolution in situ TEM has been demonstrated with aberration-corrected systems, the key difficulty with TEM imaging is its dependence on phase contrast, which requires ultra-thin specimens, limiting the choice of experiments.

Effect of using polyimide capillaries during thermal experiments on the particle size distribution of supported Pt nanoparticles

2015 ◽  
Vol 48 (5) ◽  
pp. 1599-1603 ◽  
Author(s):  
Liliana Gámez-Mendoza ◽  
Oscar Resto ◽  
María Martínez-Iñesta
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Transmission Electron Microscopy ◽  
Low Cost ◽  
Pt Nanoparticles ◽  
Dark Field ◽  
High Angle ◽  
X Ray ◽  
Transmission Electron ◽  
Annular Dark Field

Kapton HN-type polyimide capillaries are commonly used as sample holders for transmission X-ray experiments at temperatures below 673 K because of their thermal stability, high X-ray transmittance and low cost. Using high-angle annular dark field scanning high-resolution transmission electron microscopy and thermogravimetric analysis, this work shows that using polyimide capillaries leads to the overgrowth of supported Pt nanoparticles during reduction at temperatures below the glass transition temperature (Tg= 658 K) owing to an outgassing of water from the polyimide. Quartz capillaries were also studied and this overgrowth was not observed.

scholarly journals Assessment of Ag Nanoparticles Interaction over Low-Cost Mesoporous Silica in Deep Desulfurization of Diesel

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 651 ◽  
Author(s):  
Rafael V. Sales ◽  
Heloise O. M. A. Moura ◽  
Anne B. F. Câmara ◽  
Enrique Rodríguez-Castellón ◽  
José A. B. Silva ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ag Nanoparticles ◽  
Low Cost ◽  
Sulfur Compounds ◽  
Organosulfur Compounds ◽  
Regeneration Rate ◽  
X Ray ◽  
Transmission Electron ◽  
Sulfur Adsorption

Chemical interactions between metal particles (Ag or Ni) dispersed in a low-cost MCM-41M produced from beach sand amorphous silica and sulfur compounds were evaluated in the deep adsorptive desulfurization process of real diesel fuel. N2 adsorption-desorption isotherms, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM) and scanning transmission electron microscopy coupled to energy-dispersive X-ray spectroscopy (STEM-EDX) were used for characterizing the adsorbents. HRTEM and XPS confirmed the high dispersion of Ag nanoparticles on the MCM-41 surface, and its chemical interaction with support and sulfur compounds by diverse mechanisms such as π-complexation and oxidation. Thermodynamic tests indicated that the adsorption of sulfur compounds over Ag(I)/MCM-41M is an endothermic process under the studied conditions. The magnitude of ΔH° (42.1 kJ/mol) indicates that chemisorptive mechanisms govern the sulfur removal. The best fit of kinetic and equilibrium data to pseudo-second order (R2 > 0.99) and Langmuir models (R2 > 0.98), respectively, along with the results for intraparticle diffusion and Boyd’s film-diffusion kinetic models, suggest that the chemisorptive interaction between organosulfur compounds and Ag nanosites controls sulfur adsorption, as seen in the XPS results. Its adsorption capacity (qm = 31.25 mgS/g) was 10 times higher than that obtained for pure MCM-41M and double the qm for the Ag(I)/MCM-41C adsorbent from commercial silica. Saturated adsorbents presented a satisfactory regeneration rate after a total of five sulfur adsorption cycles.

Square-Shaped Nd2Sn2O7 Nanocrystals Prepared by Salt-Assistant Combustion Method

2012 ◽  
Vol 238 ◽  
pp. 79-82
Author(s):  
Yu Ping Tong ◽  
Xi Chen ◽  
Shun Bo Zhao ◽  
Lu De Lu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Low Cost ◽  
Combustion Process ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Pyrochlore Type ◽  
Ft Ir ◽  
Average Size

Ultrafine square-shaped pyrochlore-type Nd2Sn2O7 nanocrystals were synthesized by a convenient salt-assisted combustion process using glycine as fuel. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, Transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The results indicate that the products are phase-pure nanocrystals with pyrochlore-type structure. TEM and HRTEM images reveal that the products are composed of well-dispersed square-shaped Nd2Sn2O7 nanocrystals with the average size of 30 nm and the crystallite is structurally uniform and crystalline. The presented method provides a convenient and low-cost route for the synthesis of oxide materials nanostructures.

The changes caused by activation and reaction conditions on the morphology of iron catalysts

1994 ◽  
Vol 52 ◽  
pp. 778-779
Author(s):  
D. S. Kalakkad ◽  
M. Shroff ◽  
A. K. Datye
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Carbon Deposition ◽  
Low Cost ◽  
Iron Catalysts ◽  
Synthetic Fuels ◽  
Fischer Tropsch ◽  
Reaction Conditions ◽  
Transmission Electron ◽  
Fe Catalysts

Iron is considered to be one of the most active/low cost catalysts for Fischer-Tropsch synthesis (FTS) used to produce higher order hydrocarbons and synthetic fuels from coal. One of the biggest obstacles faced by the industry in the use of iron is that of rapid deactivation and attrition. While it is generally accepted that deactivation occurs due to carbon deposition or “coking”, the actual steps involved in the formation and deposition of carbon have not yet been thoroughly understood. Also, the causes for attrition in these catalysts have not yet been established.Our present study involves use of transmission electron microscopy to find the effect of various pretreatment and reaction conditions on the microstructure of Fe catalysts and scanning electron microscopy to study the problem of attrition. The transmission electron microscopy was performed on a 200 kVJEOL JEM 2000FX microscope and the SEM was done using a Hitachi S800 microscope.

scholarly journals Device Diagnosing Health of Bovine

2021 ◽  
Author(s):  
Sumi Kankana Dewan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Blood Serum ◽  
Morphological Changes ◽  
Low Cost ◽  
Hexagonal Wurtzite Structure ◽  
Biological Parameters ◽  
Serum Glutamic Oxaloacetic Transaminase ◽  
Transmission Electron ◽  
Crystallite Sizes

The research problem taken into consideration for study dealt with the design of a low cost hand-held ZnO based sensing device for testing blood serum of bovine (cow), to diagnose their health of liver and kidney by detecting four biological parameters in-situ. Zinc oxide nanoparticles were synthesised by chemical bath deposition method. Using transmission electron microscopy (TEM) and X-ray diffraction (XRD), the size of ZnO nanoparticles were determined. It shows a hexagonal wurtzite structure with an orientation along the direction (101). TEM images show various morphological changes of nanostructured ZnO. The average crystallite sizes of ZnO molecule is found to be 0.004 nm from XRD. The constituents of nano sized ZnO are found to be of Zn (57.27%), Cl (33.01%), C (8.04%) and O (1.68%) as obtained from EDS. The samples of blood serum of bovine, avian and caprine are characterised by transmission electron microscopy (TEM) and Benesphera Avantor Performance (Biochemistry Analyser). ZnO based sensing device is designed with the help of Arduino and Microsoft visual basic 6.0 version software. The resistance of blood serum is taken into consideration for carrying out the experiment. It has been measured after adding ZnO (1 μl) to blood serum of (1 ml) to detect four biological parameters – Serum glutamate pyruvate transaminase (SGPT), Serum glutamic-oxaloacetic transaminase (SGOT), Blood urea nitrogen (BUN) and creatinine of bovine more precisely. The device can indicate whether the blood serum of bovine have normal/diseased parameters. This device will also help the veterinarians in the field.

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