Transmission Electron Microscopic Investigation of Pt-Si Thin Films

1969 ◽  
Vol 27 ◽  
pp. 120-121
Author(s):  
Ronald M. Anderson ◽  
Somnath Dash
Keyword(s):  
Electron Diffraction ◽  
Ohmic Contacts ◽  
Semiconductor Device ◽  
Microscopic Investigation ◽  
Electron Microscopic Investigation ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Reflection Electron Diffraction

Recently, studies of platinum-silicon ohmic contacts in semiconductor device metallurgy have prompted us to make an investigation into the nature of the reaction between silicon and platinum. We confined ourselves to Pt deposition temperatures, annealing temperatures, and thicknesses that were germane to the production of ohmic contacts.Transmission electron microscopy, selected area electron diffraction, and reflection electron diffraction analysis, coordinated with x-ray diffraction studies, were performed and allowed us to make the following observations.

Electron microscopic investigation of the structure and morphology of syndiotactic polypropylene

1989 ◽  
Vol 47 ◽  
pp. 358-359
Author(s):  
Andrew J. Lovinger ◽  
Bernard Lotz ◽  
Don D. Davis
Keyword(s):  
Electron Microscopy ◽  
Electron Diffraction ◽  
Dark Field ◽  
Microscopic Investigation ◽  
Electron Microscopic Investigation ◽  
Dilute Solution ◽  
Electron Microscopic ◽  
Syndiotactic Polypropylene ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron

In contrast to its isotactic isomer, syndiotactic polypropylene has received only little attention. Our main source of understanding of its structure is the X-ray study by Conradini et al., who found the chains to have a (t2g2)2 conformation (corresponding to a 4∗2/1 helix with molecular repeat 0.74 nm), and to be packed in a C-centered unit cell as shown in the left side of Fig. 1. We have recently begun a study of the structure, crystallization, and morphology of syndiotactic polypropylene using electron microscopy and diffraction. Here we concentrate specifically on the electron-diffraction evidence as a function of temperature, in order to obtain an understanding of the evolution and variation of structure in this polymer.Thin films of syndiotactic polypropylene (synthesized by Dr. R. E. Cais as reported previously) were prepared by casting from dilute solution in xylenes at ca. 140°c onto freshly cleaved mica substrates. Following evaporation of the solvent, they were melted and then isothermally crystallized at a variety of temperatures. After shadowing with Pt/C and coating with carbon, they were floated off their substrates for examination by transmission electron microscopy (bright- and dark-field) and selected-area electron diffraction at 100-200 keV.

Nanocomposites Based on High-Tc Superconducting Ceramic 2212 BSCCO and their Properties

2014 ◽  
Vol 938 ◽  
pp. 210-214
Author(s):  
T.K. Jayasree ◽  
P. Predeep
Keyword(s):  
Sol Gel ◽  
Microscopic Investigation ◽  
Electron Microscopic Investigation ◽  
X Ray Diffraction ◽  
Polymer Phase ◽  
Electron Microscopic ◽  
Scanning Electron Microscopic ◽  
Scanning Electron Micrography ◽  
Superconducting Ceramic ◽  
Scanning Electron

High temperature superconducting (SC) 2212 BiSrCaCuO nanoparticles were prepared by Sol-Gel method. Precursor was characterized by X-ray diffraction (XRD) and scanning Electron micrography. The superconductor nanocomposites were fabricated by nanoparticles of the SC powder with NR/LLDPE blends. The superconductive properties of the sintered samples and the nanocomposites were studied. Transition to a superconducting state around 88K appeared in the parent sample and in the composites. The scanning electron microscopic investigation of the nanostructures of SC polymer ceramic nanocomposites shown nanoscale dispersion of BSCCO in the polymer phase uniformly.

Synthesis and characterization of nanoparticles of Ba2EuZrO5.5: A new complex perovskite ceramic oxide

2000 ◽  
Vol 15 (10) ◽  
pp. 2125-2130 ◽  
Author(s):  
R. Jose ◽  
J. James ◽  
Asha M. John ◽  
R. Divakar ◽  
J. Koshy
Keyword(s):  
High Resolution ◽  
Electron Diffraction ◽  
Particle Size Analysis ◽  
Electron Microscopic Investigation ◽  
Perovskite Oxide ◽  
Size Analysis ◽  
Complex Perovskite ◽  
Electron Microscopic ◽  
X Ray ◽  
Transmission Electron

Nanoparticles of barium europium zirconate, a complex perovskite oxide, were synthesized using a modified self-propagating combustion synthesis. The solid combustion products thus obtained were characterized by x-ray and electron diffraction, differential thermal analysis, thermogravimetric analysis, infrared spectroscopy, particle-size analysis, surface area determination, gas adsorption studies, and high-resolution transmission electron microscopy. According to the results of the x-ray and electron diffraction, as-prepared powder showed the single phase of barium europium zirconate (Ba2EuZrO5.5) without another phase and had a complex cubic perovskite (A2BB′O6) structure. The transmission electron microscopic investigation showed a mean grain size of 38 nm with a standard deviation of 12 nm. High-resolution lattice imaging of the nanoparticles indicated the possibility of finer crystallite in the particle having the same orientation. The nanoparticles of Ba2EuZrO5.5 obtained by the present method could be sintered to 97% theoretical density at a relatively low temperature of 1525 °C.

Skeletal-muscle ultrastructural pathology in patients with sepsis and multiple organ failure syndrome (MOFS)

1996 ◽  
Vol 54 ◽  
pp. 764-765
Author(s):  
A. Márquez ◽  
N.L. Diaz ◽  
H.J. Finol ◽  
M.E. Correa
Keyword(s):  
Skeletal Muscle ◽  
Multiple Organ Failure ◽  
Organ Failure ◽  
Microscopic Investigation ◽  
Multiple Organ ◽  
Electron Microscopic Investigation ◽  
Electron Microscopic ◽  
Tissue Samples ◽  
Transmission Electron ◽  
Definition Of

To date the most accepted definition of sepsis includes the suspicion of infection plus the systemic response to it (tachypnea, tachycardia and hypothermia or hyperthermia). This condition could lead to the so called multiple organ failure syndrome (MOFS) when there are evidences of flinctional compromise in two or more systems. Muscle weakness and wasting are common findings in those patients. The skeletal muscle histopathology in patients with those two conditions has been poorly studied. The only electron microscopic investigation we could find describes alterations in muscle fibers and endplates.In this work we describe the whole spectrum of changes found in skeletal muscle of patients suffering from sepsis and MOFS.Five patients recluded in an Intensive Care Unit were selected, two had a diagnosis of sepsis, and three presented MOFS. Needle muscle biopsies from quadriceps femoris muscle were obtained. Tissue samples were processed with routine techniques for transmission electron microscopy and observed in a Hitachi H-500 electron microscope.

Comparative electron microscopic investigation of the nuchal organs in Protodriloides, Protodrilus, and Saccocirrus (Annelida, Polychaeta)

1990 ◽  
Vol 68 (2) ◽  
pp. 325-338 ◽  
Author(s):  
Günter Purschke
Keyword(s):  
Microscopic Investigation ◽  
Electron Microscopic Investigation ◽  
Retractor Muscle ◽  
Sensory Cells ◽  
Ciliated Cells ◽  
Electron Microscopic ◽  
Distal Process ◽  
Transmission Electron ◽  
Sensory Cilia ◽  
Nuchal Organs

The nuchal organs of the interstitial polychaetes Protodriloides chaetifer, Protodriloides symbioticus, Protodrilus ciliatus, Protodrilus adhaerens, Saccocirrus krusadensis, and Saccocirrus papillocercus were investigated by scanning and transmission electron microscopy. These organs vary from spherical to elongated ciliary brushes and usually lie in shallow pits. In P. symbioticus only a reduced nuchal organ exists, whereas the other species all have well-developed nuchal organs of similar structure consisting of ciliated supportive cells and bipolar primary sensory cells. The perikarya of the sensory cells form the nuchal ganglia, which lie behind the brain. Different retractor muscle cells are attached to the ciliated cells. The number of sensory cells varies from 4 to about 90 according to the size of the nuchal organs. Each sensory cell gives rise to a distal process (dendrite), and 4–25 processes at a time unite to form bundles that penetrate between the ciliated cells. Apically the dendrites terminate in small sensory bulbs, each bearing several microvilli and a modified cilium. The sensory cilia usually branch, lose their axonemes, and extend as microvillus-like structures into the olfactory chamber representing an extracellular space below the reduced cuticle. Specific microvillar processes of the ciliated cells form a dense cover above the cuticle which is only penetrated by the motile cilia of these cells. The ciliated cells are highly pinocytic. The nuchal organs of the species investigated show striking similarities to those of spionids.

Sign in / Sign up

Export Citation Format

Share Document