Analytical transmission electron microscopy ATEM

The EXAFS spectroscopy results strongly confirm the existence of local order in the mineral part of lead isooctane reverse micelles in dodecane and reveal quantitative information concerning the first and second coordination shells. The radial distribution functions (RDFs) exhibit peaks at around 0.19 nm, corresponding to the first shell of oxygen atoms and at around 0.35 nm corresponding to the shell of lead. Analytical transmission electron microscopy (ATEM) indicates the size of the mineral core of the micelles (1-1.5 nm) and the discoid shape of the particles when the micelles aggregate (Mansot et al. 1994). 

In the boundary lubrication regime, the antiwear and Mction-reduction processes are associated to the build-up of a tribologic film resulting from the chemical reaction between oil additives and sliding surfaces in contact [1-3]. The case of zinc dialkyl dithiophosphate (ZDDP) additive has been extensively studied by analytical transmission electron microscopy (ATEM) and the morphology, nature, structure and tribologic properties of the tribochemical film were obtained [4-6], The Figures 4.1 and 4.2 summarize the main results. 

This article reviews the relevant literature on cement/rock and mineral/alkali interaction, and presents the results of experimental and archaeological analogue studies in which Analytical Transmission Electron Microscopy (ATEM) has been used to characterize C-A-S-H phases. 

In none of the archaeological analogue studies described, and in only very few of the experimental studies, were analyses made at the resolution afforded by analytical transmission electron microscopy (or ATEM). Use of bulk or low resolution methods alone can lead to unreliable phase identification in these materials, and only limited information can be obtained about gel phases. ATEM allows compositional, morphological and crystallographic information to be obtained at a much higher resolution than more standard methods, and is thus well suited to the... 

---