جستجوی مقالات مرتبط با کلیدواژه « tem » در نشریات گروه « پیراپزشکی »
تکرار جستجوی کلیدواژه «tem» در نشریات گروه «بهداشت و درمان»-
In this article, TEM sample preparation techniques for nanomaterials and composites are described with illustrative examples. The site-specific TEM specimen preparation using focused ion beam (FIB) milling is presented, too. As specimen preparation involves thinning the sample to electron transparent thickness it can result in artifacts, which are briefly reported.
Keywords: TEM, Specimen preparation, TEM foils, electropolishing, ionmilling, FIB, artifacts} -
Transmission electron microscopy (TEM) is a powerful tool for the investigation of the microstructure of materials, providing crystallographic information and composition at the nanometer scale.So, samples should be transparent to the electron beam. This article has been provided in two parts. In first part TEM sample preparation techniques for different classes of metals, alloys and multilayered coatings are discussed. The second part, describes TEM sample preparation techniques for nanomaterials and composites with illustrative examples. Also, site-specific TEM specimen preparation using focused ion beam (FIB) milling will be presented in part 2.
Keywords: TEM, Specimen preparation, TEM foils, electropolishing, ionmilling, FIB} -
Aerogel is a synthetic porous ultralight material derived from a gel, in which the liquid component of the gel has been replaced with a gas. The structural characterization of these disparate materials often requires techniques beyond routine application of basic transmission electron microscopy (TEM) technique. With care in sample preparation and operating technique, the full range of TEM techniques from high-resolution imaging to energy-filtered imaging and high-angle annular dark field imaging can be used to obtain more detailed information about the aerogels. This paper serves as a guide to introduce TEM modes for investigating aerogel architectures.
Keywords: Aerogel, transmissionelectron microscopy, TEM} -
Carbon nanotubes (CNTs) are allotropes of carbon with a cylindrical hollow nanostructure with the walls formed by one-atom-thick sheets of carbon, which was discovered in 1991 by Sumio Iijima, a senior research fellow at NEC. Since their discovery several methods have been used to produce single and multi walled nanotubes. One of the best methods for their characterization is TEM, STM, AFM and SEM imaging. The current study is dedicated to sample preparation and TEM imaging for CNTs.
Keywords: sample preparation, nanotube, characterization, TEM, CNT} -
Dispersion is one of the most popular techniques to powder sample preparation for TEM imaging. Powder dissolved in a relatively volatile solvent will be dropped on a circular copper grid. If the sample is not already dispersed in solution, it will be agglomerated and formed into large particles which are not proper to TEM imaging. In this study the effects of different parameters such as temperature, pH, Ultrasonic, etc. on dispersion of particles have been investigated. It shows that the increase in ultrasonic's time cause to the better dispersion but it has an optimum time. Using surfactants depends on the other parameters and it will be easily operable by measuring Zeta potential.
Keywords: TEM, dispersion, Sample prepration}
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