Electron microscopy of colloidal metal particles in alkali halides

1975 ◽  
Vol 46 (7) ◽  
pp. 2837-2840 ◽  
Author(s):  
Yuris A. Ekmanis ◽  
Elmer A. Rosauer
Keyword(s):  
Electron Microscopy ◽  
Alkali Halides ◽  
Metal Particles ◽  
Colloidal Metal

scholarly journals Multiple Correlative Immunolabeling for Light and Electron Microscopy Using Fluorophores and Colloidal Metal Particles

2007 ◽  
Vol 55 (10) ◽  
pp. 983-990 ◽  
Author(s):  
Irawati K. Kandela ◽  
Reiner Bleher ◽  
Ralph M. Albrecht
Keyword(s):  
Electron Microscopy ◽  
Spatial Resolution ◽  
Light And Electron Microscopy ◽  
Human Platelets ◽  
Model Systems ◽  
Metal Particles ◽  
Fluorescence Signal ◽  
Energy Filtering ◽  
Sufficient Distance ◽  
Colloidal Metal

Multiple correlative immunolabeling permits colocalization of molecular species for sequential observation of the same sample in light microscoopy (LM) and electron microscopy (EM). This technique allows rapid evaluation of labeling via LM, prior to subsequent time-consuming preparation and observation with transmission electric miscroscopy (TEM). The procedure also yields two different complementary data sets. In LM, different fluorophores are distinguished by their respective excitation and emission wavelengths. In EM, colloidal metal nanoparticles of different elemental composition can be differentiated and mapped by energy-filtering transmission electron microscopy with electron spectroscopic imaging. For the highest level of spatial resolution in TEM, colloidal metal particles were conjugated directly to primary antibodies. For LM, fluorophores were conjugated to secondary antibodies, which did not affect the spatial resolution attainable by fluorescence microscopy but placed the fluorophore at a sufficient distance from the metal particle to limit quenching of the fluorescence signal. It also effectively kept the fluorophore at a sufficient distance from the colloidal metal particles, which resulted in limiting quenching of the fluorescent signal. Two well-defined model systems consisting of myosin and α-actinin bands of skeletal muscle tissue and also actin and α-actinin of human platelets in ultrathin Epon sections were labeled using both fluorophores (Cy2 and Cy3) as markers for LM and equally sized colloidal gold (cAu) and colloidal palladium (cPd) particles as reporters for TEM. Each sample was labeled by a mixture of conjugates or labels and observed by LM, then further processed for TEM. (J Histochem Cytochem 55: 983–990, 2007)

Electron Microscopy of the Shape of Small Metal Particles

1977 ◽  
Vol 35 ◽  
pp. 300-301
Author(s):  
M. Jose Yacaman
Keyword(s):  
Electron Microscopy ◽  
Metal Particle ◽  
Field Experiments ◽  
Size Range ◽  
Dark Field ◽  
Metal Particles ◽  
Bragg Condition ◽  
Crystal Particle ◽  
Small Metal Particle ◽  
Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

Analytical Electron Microscopy study of two vehicle-aged automotive exhaust catalysts having dissimilar activities

1989 ◽  
Vol 47 ◽  
pp. 272-273
Author(s):  
Sooho Kim ◽  
M. J. D’Aniello
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Noble Metal ◽  
Catalyst Deactivation ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Metal Particles ◽  
Automotive Exhaust ◽  
Exhaust Catalysts ◽  
Analytical Electron

Automotive catalysts generally lose-agtivity during vehicle operation due to several well-known deactivation mechanisms. To gain a more fundamental understanding of catalyst deactivation, the microscopic details of fresh and vehicle-aged commercial pelleted automotive exhaust catalysts containing Pt, Pd and Rh were studied by employing Analytical Electron Microscopy (AEM). Two different vehicle-aged samples containing similar poison levels but having different catalytic activities (denoted better and poorer) were selected for this study.The general microstructure of the supports and the noble metal particles of the two catalysts looks similar; the noble metal particles were generally found to be spherical and often faceted. However, the average noble metal particle size on the poorer catalyst (21 nm) was larger than that on the better catalyst (16 nm). These sizes represent a significant increase over that found on the fresh catalyst (8 nm). The activity of these catalysts decreases as the observed particle size increases.

Structure and growth of colloidal metal particles

1989 ◽  
Vol 91 (1) ◽  
pp. 603-611 ◽  
Author(s):  
David J. Wales ◽  
Angus I. Kirkland ◽  
David A. Jefferson
Keyword(s):  
Metal Particles ◽  
Colloidal Metal

Surface plasmon absorption of various colloidal metal particles

1982 ◽  
Vol 68 (1-2) ◽  
pp. 137-141 ◽  
Author(s):  
H. Abe ◽  
K.P. Charlé ◽  
B. Tesche ◽  
W. Schulze
Keyword(s):  
Surface Plasmon ◽  
Metal Particles ◽  
Plasmon Absorption ◽  
Surface Plasmon Absorption ◽  
Colloidal Metal

The preparation of monodisperse colloidal metal particles from microemulsions

1982 ◽  
Vol 5 (3) ◽  
pp. 209-225 ◽  
Author(s):  
Magali Boutonnet ◽  
Jerzy Kizling ◽  
Per Stenius ◽  
Gilbert Maire
Keyword(s):  
Metal Particles ◽  
Colloidal Metal

scholarly journals Исследование пиролизата фталоцианина Fe методами мессбауэровской спектроскопии и просвечивающей электронной микроскопии

2018 ◽  
Vol 60 (5) ◽  
pp. 1018 ◽  
Author(s):  
В.С. Козлов ◽  
В.Г. Семенов ◽  
К.Г. Каратеева ◽  
В.Ю. Байрамуков
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Phase Composition ◽  
Magnetic State ◽  
Metal Particles ◽  
Iron Phthalocyanine ◽  
Pyrolysis Products ◽  
Transmission Electron ◽  
Morphology And Structure

AbstractA pyrolyzate of iron phthalocyanine is studied by Mössbauer spectroscopy and transmission electron microscopy. The phase composition and magnetic state were found for pyrolysis products (α-Fe, γ-Fe, Fe_3C, and magnetite). Morphological features of carbon and iron-containing phases (metal particles of various shapes and sizes, as well as carbon nanotubes, carbon hollow nanopolihedra, and nongraphitized carbon) are determined. The morphology and structure of iron phthalocyanine pyrolyzates and diphthalocyanines of rare-earth elements are analyzed.

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