scholarly journals Microwave Assisted Rapid Diagnosis of Plant Virus Diseases by Transmission Electron Microscopy

10.3791/2950 ◽  
2011 ◽  
Author(s):  
Bernd Zechmann ◽  
Gerhard Graggaber ◽  
Günther Zellnig
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Plant Virus ◽  
Rapid Diagnosis ◽  
Virus Diseases ◽  
Microwave Assisted ◽  
Transmission Electron

Rapid Synthesis of Uniform CdSe Nanorods by a Microwave-Assisted Solvothermal Method in Ethylenediamine

2020 ◽  
Vol 20 (10) ◽  
pp. 6495-6499
Author(s):  
Maokun Han ◽  
Ruijuan Qi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Solvothermal Method ◽  
X Ray Diffraction ◽  
Rapid Synthesis ◽  
X Ray ◽  
Microwave Assisted ◽  
Aspect Ratios ◽  
Transmission Electron ◽  
Cdse Nanorods

A rapid microwave-assisted solvothermal method is reported for the synthesis of uniform CdSe nanorods in ethylenediamine (EDA) using CdCl2 and elemental Se as reactants. The resultant nanorods have a diameter of approximately 10 nm and a length of approximately 300 nm. Our experiments show that the concentrations of EDA and CdCl2 play important roles in product morphology. The well-dispersed CdSe nanorods with high aspect ratios were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), UV-vis absorption and photoluminescence (PL).

scholarly journals In-Depth Structural and Optical Analysis of Ce-modified ZnO Nanopowders with Enhanced Photocatalytic Activity Prepared by Microwave-Assisted Hydrothermal Method

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 551 ◽  
Author(s):  
Otman Bazta ◽  
Ana Urbieta ◽  
Susana Trasobares ◽  
Javier Piqueras ◽  
Paloma Fernández ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photocatalytic Activity ◽  
Scanning Transmission Electron Microscopy ◽  
Atomic Scale ◽  
X Ray ◽  
Microwave Assisted ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission

Pure and Ce-modified ZnO nanosheet-like polycrystalline samples were successfully synthesized by a simple and fast microwave-based process and tested as photocatalytic materials in environmental remediation processes. In an attempt to clarify the actual relationships between functionality and atomic scale structure, an in-depth characterization study of these materials using a battery of complementary techniques was performed. X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM), energy-dispersive X-Ray spectroscopy-scanning transmission electron microscopy (STEM-XEDS), photoluminescence spectroscopy (PL) and UV–Visible absorption spectroscopy were used to evaluate the effect of Ce ions on the structural, morphological, optical and photocatalytic properties of the prepared ZnO nanostructures. The XRD results showed that the obtained photocatalysts were composed of hexagonal, wurtzite type crystallites in the 34–44 nm size range. The SEM and TEM showed nanosheet-shaped crystallites, a significant fraction of them in contact with bundles of randomly oriented and much smaller nanoparticles of a mixed cerium–zinc phase with a composition close to Ce0.68Zn0.32Ox. Importantly, in clear contrast to the prevailing proposals regarding this type of materials, the STEM-XEDS characterization of the photocatalyst samples revealed that Ce did not incorporate into the ZnO crystal lattice as a dopant but that a heterojunction formed between the ZnO nanosheets and the Ce–Zn mixed oxide phase nanoparticles instead. These two relevant compositional features could in fact be established thanks to the particular morphology obtained by the use of the microwave-assisted hydrothermal synthesis. The optical study revealed that in the ZnO:Ce samples optical band gap was found to decrease to 3.17 eV in the samples with the highest Ce content. It was also found that the ZnO:Ce (2 at.%) sample exhibited the highest photocatalytic activity for the degradation of methylene blue (MB), when compared to both the pure ZnO and commercial TiO2-P25 under simulated sunlight irradiation. The kinetics of MB photodegradation in the presence of the different photocatalysts could be properly described using a Langmuir–Hinshelwood (LH) model, for which the ZnO:Ce (2 at.%) sample exhibited the highest value of effective kinetic constant.

scholarly journals Ultrastructure of the Epithelial Cells Associated with Tooth Biomineralization in the Chiton Acanthopleura hirtosa

2009 ◽  
Vol 15 (2) ◽  
pp. 154-165 ◽  
Author(s):  
Jeremy A. Shaw ◽  
David J. Macey ◽  
Lesley R. Brooker ◽  
Edward J. Stockdale ◽  
Martin Saunders ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Epithelial Cells ◽  
Light Microscopy ◽  
Mineralization Process ◽  
Conventional Transmission Electron Microscopy ◽  
Physiological Conditions ◽  
Microwave Assisted ◽  
Transmission Electron ◽  
Extracellular Compartment

AbstractThe cusp epithelium is a specialized branch of the superior epithelium that surrounds the developing teeth of chitons and is responsible for delivering the elements required for the formation of biominerals within the major lateral teeth. These biominerals are deposited within specific regions of the tooth in sequence, making it possible to conduct a row by row examination of cell development in the cusp epithelium as the teeth progress from the unmineralized to the mineralized state. Cusp epithelium from the chiton Acanthopleura hirtosa was prepared using conventional chemical and microwave assisted tissue processing, for observation by light microscopy, conventional transmission electron microscopy (TEM) and energy filtered TEM. The onset of iron mineralization within the teeth, initiated at row 13, is associated with a number of dramatic changes in the ultrastructure of the apical cusp cell epithelium. Specifically, the presence of ferritin containing siderosomes, the position and number of mitochondria, and the structure of the cell microvilli are each linked to aspects of the mineralization process. These changes in tissue development are discussed in context with their influence over the physiological conditions within both the cells and extracellular compartment of the tooth at the onset of iron mineralization.

Microwave-assisted synthesis of various gallium oxyhydroxide nanorods and their controllable conversion into different gallium oxide polymorphs

2009 ◽  
Vol 24 (7) ◽  
pp. 2268-2275 ◽  
Author(s):  
Suxiang Ge ◽  
Lizhi Zhang ◽  
Huimin Jia ◽  
Zhi Zheng
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gallium Oxide ◽  
Disodium Salt ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
Microwave Assisted ◽  
Transmission Electron ◽  
Oxide Nanorods ◽  
Microwave Assisted Method

Various α-GaOOH nanorods were synthesized through a microwave-assisted method at 80 °C. In the synthesis, Ga(NO3)3 was used as the gallium source, and urea, L-cysteine, and EDTA disodium salt were used as the additives. The thermal decomposition of the as-prepared α-GaOOH nanorods could selectively produce α-, β-, and ε-Ga2O3 nanorods. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, and cathodoluminescence were used to characterize the resulting samples. On the basis of characterization results, the possible growth mechanisms of these various GaOOH nanorods were proposed. This study provides a controllable method to prepare various gallium oxyhydroxide and gallium oxide nanorods.

Microwave heating and the fast ADOR process for preparing zeolites

2017 ◽  
Vol 5 (17) ◽  
pp. 8037-8043 ◽  
Author(s):  
Marta Navarro ◽  
Samuel A. Morris ◽  
Álvaro Mayoral ◽  
Jiří Čejka ◽  
Russell E. Morris
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Microwave Heating ◽  
Scanning Transmission Electron Microscopy ◽  
Microwave Assisted ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission

Microwave-assistedvs.conventional ADOR mechanism in the synthesis of IPC-5, using Scanning Transmission Electron Microscopy (STEM) as a crucial characterisation technique.

scholarly journals One-Pot Microwave-Assisted Synthesis of Graphene-Supported PtCoM (M = Mn, Ru, Mo) Catalysts for Low-Temperature Fuel Cells

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1431
Author(s):  
Antanas Nacys ◽  
Teofilius Kilmonis ◽  
Virginija Kepenienė ◽  
Aldona Balčiūnaitė ◽  
Raminta Stagniūnaitė ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Microwave Assisted Synthesis ◽  
Electrochemical Characteristics ◽  
One Pot ◽  
Molar Ratios ◽  
Microwave Assisted ◽  
Transmission Electron ◽  
Low Temperature Fuel Cells ◽  
A Current

In this study, one-pot microwave-assisted synthesis was used to fabricate the graphene (GR)-supported PtCoM catalysts where M = Mn, Ru, and Mo. The catalysts with the molar ratios of metals Pt:Co:Mn, Pt:Co:Ru, and Pt:Co:Mo equal to 1:3:1, 1:2:2, and 7:2:1, respectively, were prepared. Catalysts were characterized using Transmission Electron Microscopy (TEM). The electrocatalytic activity of the GR-supported PtCoMn, PtCoRu, and PtCoMo catalysts was evaluated toward methanol oxidation in an alkaline medium employing cyclic voltammetry and chrono-techniques. The most efficient electrochemical characteristics demonstrated the PtCoMn/GR catalyst with a current density value of 144.5 mA cm−2, which was up to 4.8 times higher than that at the PtCoRu(1:2:2)/GR, PtCoMo(7:2:1)/GR, and bare Pt/GR catalysts.

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