electron microscopy Articles
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The Canadian Centre for Electron Microscopy: a national facility for ultrahigh resolution electron microscopy
The Canadian Centre for Electron Microscopy is described and the facilities available to Canadian researchers and international collaborators are presented. The facility offers aberration-corrected transmission electron microscopy instrumentation, conventional transmission electron microscopes, scanning electron microscopes and a suite of sample preparation facilities. The advantages and benefits ...
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Ten years of electron microscopy of nanomaterials in St. Andrews
Since the Electron Microscopy Laboratory was established in 2000 in School of Chemistry, University of St. Andrews, a variety of research projects have been successfully performed. Most of the projects focused on nanomaterials, porous materials and energy materials. This research has become one of the most active branches in chemical research at St. Andrews. This paper gives a brief review of the ...
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The mechanisms of particle formation in Y-doped ZrO2
The processes of nanopowder formation in ZrO2–3 mol.% Y2O3 system at 350–900°C obtained by co-precipitation using ultrasound (US), microwave (MW) heating and pulse magnetic field (PMF) treatment are considered. The energy estimations are made on the basis of Avrami theory for the crystallisation at 350°C and 400°C. It was stated by X-ray diffraction (XRD) methods that the primary particle size is ...
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Very low energy scanning electron microscopy in nanotechnology
The group of low energy electron microscopy at ISI AS CR in Brno has developed a methodology for very low energy scanning electron microscopy at high image resolution by means of an immersion electrostatic lens (the cathode lens) inserted between the illumination column of a conventional scanning electron microscope and the sample. In this way the microscope resolution can be preserved down to a ...
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Synthesis of ZnWO4/Ag3PO4 p–n heterojunction photocatalyst and enhanced visible-light photocatalytic applications
The ZnWO4/Ag3PO4 nanocomposites synthesized by simple precipitation processes were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and UV-vis diffuse reflectance spectra. The results indicated that the ZnWO4 nanorods dispersed well on the surface of Ag3PO4 ...
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Single-particle analysis and electron tomography
Both single-particle analysis and electron tomography are special tools for the structural analysis of biological components by transmission electron microscopy. Single-particle analysis enables us to determine the structures of relatively large proteins and macromolecular complexes without crystallisation. Electron tomography is often used to visualise organelles and subcellular structures at ...
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On the nanoscaled defects of 3C–SiC
In the present work we report on some recent results on the 3C–SiC structural nanoscaled defects, studied by Transmission Electron Microscopy. The examined samples were grown in several laboratories by different methods such as Vapour–Liquid–Solid, Continuous Feed Physical Vapour Transport, Chemical Vapour Deposition and Liquid Phase Epitaxy. In all these methods, for both bulk and epitaxial ...
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Facile decolorization of methylene blue with flower-like manganese wads
Flower-like manganese wads (MWs) were synthesized via a simple and inexpensive ultrasonic irradiation method for the first time. MWs were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray and transmission electronic microscopy. The decolorization efficiency of MWs for methylene blue (MB) azo dye was examined as a function of pH, stirring time, MW dosage ...
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Study on fabrication and photoluminescence of SiC nanorods synthesised by carbothermal reduction
SiC nanorods were synthesised from SiO2 xerogel containing carbon nanoparticles at 1550°C in argon flow. The morphology and structure of the materials were determined by transmission electron microscopy, scanning electron microscopy, X-ray diffraction and Raman scattering methods. The static photoluminescence and time-resolved photoluminescence of SiC nanorods were examined under different ...
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Preparation of wrapped nZVI particles and their application for the degradation of trichloroethylene (TCE) in aqueous solution
Three types of wrappped nanoscale zero-valent iron (W-nZVI) with different coatings including agar, starch, and carboxyl methyl cellulose, were synthesized using a rheological phase reaction method. The structure and morphology of W-nZVI particles were characterized by scanning electron microscopy and transmission electron microscopy. Batch degradation experiments exhibited that W-nZVI ...
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Room temperature, water-based, microreactor synthesis of gold and silver nanoparticles
Synthesis of gold and silver nanoparticles at room temperature using a polydimethylsiloxane (PDMS) microreactor has been reported. The reactions have been performed using aqueous metal salt solutions and borohydride reducing agent with tri-sodium citrate as the capping agent. Effect of concentration of reducing agent on the optical properties of the nanoparticles has been investigated. The ...
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Nanoindentation-induced structural phase transformations in crystalline and amorphous germanium
During hardness indentation with a diamond indenter, materials are subjected to highly localised pressures. These pressures may cause a complete change of atomic arrangement of the material within the indented zone. This paper reports that when a Berkovich or Vickers nanoindenter is loaded onto a submicrometer thick film of amorphous germanium (a-Ge) and germanium single crystals (Ge-I), they ...
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Cross-section high resolution transmission electron microscopy and nanoprobe investigations of gallium nitride nanowires
Gallium nitride nanowires and rods were grown by a vapour-solid growth mechanism over an 850-1,000°C furnace growth temperature range. Investigations by parallel (cross-section) high resolution transmission electron microscopy revealed correlated internal structures. The effects of the internal structures on electronic properties were investigated by micro- and nano-probe experiments. A ...
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Electrospun substituted polyphenylene vinylene nanofibres
Biosensors are a rapidly growing research field, which is being swiftly advanced due to recent advances in nanotechnology. However most of the sensors developed are solution based, which limits their commercial use. Thus, with the view of developing bio–nanosensors based on solid–state photoluminescent nanofibres the electrospinning process was optimised for a novel PPV–derivative composite ...
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Novel p–n junction UiO-66/BiOI photocatalysts with efficient visible-light-induced photocatalytic activity
Novel visible-light-induced UiO-66/BiOI photocatalysts with a p–n junction structure have been prepared for the first time through a facile hydrothermal method. The prepared photocatalysts were characterized using the powder X-ray diffraction, high resolution transmission electron microscopy, scanning electron microscopy, UV–visible diffuse reflectance spectra, and N2 adsorption–desorption ...
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Use advanced microscopy to understand how cells break down proteins
Proteins are an integral part of all living things. From enzymes that carry out chemical reactions to messengers that transmit signals between cells, much research has been conducted on how and what these proteins are produced and do. In 2004, Aaron Ciechanover, Avram Hershko, and Irwin Rose won the Nobel Prize in Chemistry for a different but equally important mechanical process of proteins: how ...
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Microstructural study of thermally treated reactor pressure vessel steels using spectroscopic methods
Positron annihilation spectroscopy (lifetime and Doppler broadening techniques), transmission Mössbauer spectroscopy, integral low-energy electron Mössbauer spectroscopy and transmission electron microscopy were applied to examine thermally treated reactor pressure vessel steels (RPV). The results of these methods obtained for different types of steels are discussed and correlated with hardness ...
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Preparation and characterisation of silver doped ZnO nanostructures
ZnO was prepared by hydrothermal method. The result of scanning electron microscopy showed that the materials had nanorod structures. Ag–doped ZnO was prepared by UV–photoreduction respectively. Crystalline phases and optical absorption of the prepared samples were determined by X–ray diffraction, Raman spectrum and UV–visible spectrophotometer. X–ray analyses reveals that Ag doped ZnO ...
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How Bacteria Move Revealed
Researchers at the University of Virginia School of Medicine and their collaborators have solved a decades-long puzzle about how E. coli and other bacteria can move. Bacteria push themselves forward by coiling long, thread-like accessory parts into the shape of a bottle opener, like temporary propellers. But how they do this puzzles scientists because the propeller consists of a single protein. ...
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Effects of sublethal waterborne cadmium on gills in three teleosteans species: scanning electron microscope study
The effects of acute exposure for 96 h to a sublethal concentration of cadmium (300 µg L−1) on the surface gill morphology of the teleosteans Cyprinus carpio, Australoheros facetum and Astyanax fasciatus were studied using Scanning Electron Microscopy (SEM). The main cadmium-induced gill damages in the three species were: structural alterations, oedema and fusion of adjacent secondary lamellae; ...
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