Electronic transmission, chemical reports

For example, Wuelfing et al. reported on the synthesis of Au NPs using the thiolated polymer, a-methoxy-co-mercapto-poly(ethylene glycol) (PEG-SH), as stabilizer in a modification of the Brust-Schiffrin method using a 1/12 polymer thiol/ AuC14 ratio. Transmission electron microscopy showed that the product had modestly polydisperse Au cores of average diameter 2.8 1 nm. This nanomaterial led to characteristics uniquely different from alkanethiolate MPCs, notably aqueous solubility, thermal and chemical stability, ligand footprint size, and ionic conductivity [66]. 

It was reported that the K/Cu-Zn-Fe oxides catalyst efficiently converted a mixture of COj and H2 into ethanol by Mitsubishi Gas Chemical and National Institute of Material and Chemical Research [1]. However, the catalyst was deactivated quickly during the reaction. To improve the catalytic life, an addition of various kinds of components was tried. It was found that the addition of Cr component to the catalyst prevented the deactivation of catalyst [2]. In this paper, we describe the effect of the addition of Cr component to the catalyst from the results of XRD analysis, transmission electron microscope observation (TEM), and energy-dispersive X-ray microanalysis (EDS) of the catalysts before and after the reaction. 

Numerous experiments have been carried out in this laboratory using particularly alumina as substrate (but also Ti02) and Pt, Pd, Ni, Co, Fe and some of their alloys as metals (8-12). Only a few results obtained with Fe/Al203 are reported here more details are included in Reference 8. The experiments are based on transmission electron microscopy, which provides information on the physical behaviour of the crystallites, and on electron diffraction, which provides information on the chemical compounds formed as a result of the interactions between atmosphere, substrate and metal. 

Mo forms a silicide and a carbide. Geib et al [96] reported Auger sputter-profiling results for Mo sputter-deposited on chemically-cleaned P-SiC. Thermodynamic considerations indicate that reaction of Mo with SiC should not be favourable. Other than a thin reacted layer at the immediate interface, there is no indication of reactive intermixing even after an 800 °C anneal. Hara et al [97] reported AES, Rutherford backscattering (RBS), XRD and transmission electron microscopy (TEM) measurements on Mo layers formed either by plasma deposition or by evaporation on chemically-cleaned a- and P-SiC. Prolonged (1 hr) anneals at 1200°C give an outer layer of Mo carbide on top of a layer of Mo silicide. 

Fibers of the control and selected chemically modified cottons were examined techniques of optical microscopy described previously.Ultra thin cross sections of the fibers were subjected to layer expansion by polymerization of methyl methacrylate and to solubility tests in 0.5 M cupriethylenediamine (cuene) and were examined by the techniques of transmission electron microscopy as previously reported.Scanning electron micrographs of fibers of selected samples before and after subjection to various solvents were also obtained. 

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