TEM – Page 3 – TechConnect Briefs

Bimodal size distributed silver nanoparticles on copper substrate: in situ heat treating under air and protective atmospheres

Sopousek J., Bursik J., Zalesak J., Pesina Z., Masaryk University, CZ

Ag nano-suspension was prepared by a wet synthetic route. The liquid phase consisted of an organic solvent and the particles had a bimodal distribution with a very narrow size distribution (compare Figure 1). The surface [...]

Controlling the Size and Morphology of Silver Nanoparticles: Role of Chemical Routes

Ahmad T., Jamia Millia Islamia (Central University), IN

The preparation of nanoparticles with well defined size and morphology is an important challenge for various industrial applications. Silver nanoparticles with controlled size and morphology have been prepared successfully through various chemical routes (Inverse microemulsions, [...]

Fabrication and Thermomechanical Characterization of CNF-Filled Polyester and E-Glass/Polyester Nanophased Composites

Hossain M.E., Hossain M.K., Hossain M.E., Hossain M.K., Hosur M., Jeelani S., Rangari V., Tuskegee University, US

A high intensity ultrasonic liquid processor was used to infuse CNFs into the polyester matrix which was then mixed with catalyst using a high speed mechanical agitator. Results showed the significant improvement of mechanical properties [...]

High Strain Rate Compression Behavior of Conventional and CNF-Filled-Nanophased Glass/Polyester Composites

Hossain M.E., Hossain M.K., Hossain M.E., Hossain M.K., Hosur M., Jeelani S., Rangari V., Tuskegee University, US

A high intensity ultrasonic liquid processor was used to infuse carbon nanofibers (CNFs) into polyester matrix that was then mixed with hardener using a high speed mechanical agitator. The trapped air and reaction volatiles were [...]

Nano-scale TEM studies of the passive film and the chloride-induced depassivation of carbon steel in concrete

Ghods P., Isgor O.B., Li J., Carpenter G., McRae G., Gu G.P., Carleton University, CA

In the highly alkaline environment of concrete, carbon steel rebar is protected against corrosion by a passive iron oxide film. The partial or complete loss of the protective oxide film, known as depassivation, leads increased [...]

Conformation of pH Responsive Alternating Copolymers and Self-Assembly in Nanoarchitectures

Chan A.S.W., Groves M., Malardier-Jugroot C., Royal Military College of Canada, CA

Our research focuses on the characterization of the association and the properties in aqueous solution of nanostructures composed of amphiphilic alternating copolymers. These copolymers are composed of a pH sensitive hydrophilic group, maleic anhydride alternating [...]

Automated Crystal Orientation and Phase Mapping of Iron Oxide Nano-Crystals in a Transmission Electron Microscope

Rouvimov S., Rauch E.F., Moeck P., Nicolopoulos S., Portland State University, US

An automated technique for the crystal phase and orientation mapping of polycrystalline materials in a TEM has recently beam developed. This technique is based on template matching of experimental electron diffraction spot patterns to their [...]

Structural Fingerprinting of Nanocrystals in the Transmission Electron Microscope

Moeck P., Rouvimov S., Nicolopoulos S., Portland State Unversity, US

Three novel strategies for the structurally identification of nanocrystals in a Transmission Electron Microscope (TEM) are presented. Either a single High-Resolution Transmission Electron Microscopy (HRTEM) image or a single Precession Electron Diffractogram (PED) can be [...]

Analytical Transmission Electron Microscopy characterization of nano-structured materials

Sharma U., Susnitzky D., Evans Analytical Group, US

This article reviews applications of analytical transmission electron microscopy (TEM) to characterize nano-structured materials and devices. Several practical examples are provided that show the diverse imaging and microanalysis mechanisms available in a modern TEM. By [...]

In-Situ Nanomechanical-Electrical Testing of One-Dimensional Materials

Yassar R.S., Yap Y.K., Michigan Technological University, US

One-dimensional nanomaterials including nanotubes are building blocks for constructing various complex nanodevices. Boron nitride (BN) nanotubes with structure similar to carbon nanotube are known to be among the strongest insulators in the world. In this [...]