scholarly journals Heterogeneous distribution of conductive particles in polymer blends studied by electron microscopy.

1991 ◽  
Vol 47 (8) ◽  
pp. 384-387
Author(s):  
Masao Sumita ◽  
Kazuya Sakata ◽  
Shigeo Asai ◽  
Keizo Miyasaka ◽  
Hideaki Nakagawa
Keyword(s):  
Electron Microscopy ◽  
Polymer Blends ◽  
Heterogeneous Distribution ◽  
Conductive Particles

Cryo-Scanning Electron Microscopy: A New Tool for Interpretation of Fracture Studies in Bitumen/Polymer Blends

2002 ◽  
Vol 16 (1) ◽  
pp. 143-147 ◽  
Author(s):  
L. Champion-Lapalu ◽  
A. Wilson ◽  
G. Fuchs ◽  
D. Martin ◽  
J.-P. Planche
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Polymer Blends ◽  
Cryo Scanning Electron Microscopy ◽  
Scanning Electron

scholarly journals Phase-separated polymer blends: Complementary studies between scanning electron microscopy, epifluorescence microscopy, and fluorescence microspectroscopy

2001 ◽  
Vol 80 (7) ◽  
pp. 949-955 ◽  
Author(s):  
E. G. Granados ◽  
J. González-Benito ◽  
J. Baselga ◽  
D. Dibbern-Brunelli ◽  
T. D. Z. Atvars ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Polymer Blends ◽  
Epifluorescence Microscopy ◽  
Scanning Electron

scholarly journals Origin of surface impurities on the Cave of Swords selenite crystals at Naica

2014 ◽  
Vol 70 (a1) ◽  
pp. C66-C66
Author(s):  
Maria Elena Montero-Cabrera ◽  
Isai Castillo-Sandoval ◽  
Luis Fuentes-Cobas ◽  
Hilda Esparza-Ponce ◽  
Maria Elena Fuentes-Montero ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Grazing Incidence ◽  
Confocal Laser ◽  
Heterogeneous Distribution ◽  
Edge Structure ◽  
X Ray ◽  
Transmission Electron ◽  
Incidence Geometries ◽  
The Look

The Cave of Swords was discovered in 1910 at Naica mine, Chihuahua, Mexico. Its name refers to the look of the 1-2 m long crystals the cave had when it was discovered. Currently the crystals are 0.1-0.3 m long. The crystals surface is opaque and ocher. For over 100 years these crystals continue to amaze and give us clues about their formation. This work is part of a research aimed at the conservation of the Naica Giant Crystals. Thirteen samples from the Cave of Swords were analyzed by Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS), Confocal Laser Microscopy with Differential Interference Contrast (LCM-DIM) and Transmission Electron Microscopy (TEM). X-Ray Fluorescence (μ-XRF) together with X-ray Absorption Near Edge Structure (μ-XANES) and X-ray Photoelectron Spectroscopy (XPS) were employed for elemental analysis. For phase analysis, X-ray diffraction (XRD) in both symmetric and grazing incidence geometries (GI-XRD) and Micro electron diffraction at TEM were used. Impurities on crystals surfaces show a heterogeneous distribution of the present elements. The thickness of impurities ranges from 120 nm to 150 μm. The phases identified were (see figure) gypsum (1, 2, 3, 6, 9, 10, 13), hematite (4, 7, 8), sphalerite (14), chalcopyrite (11), cuprite (15), galena (5), alabandite (12), halite, fluorite and amorphous Pb and Mn oxy-hydroxides. Al, C, Ca, Cl, Cu, F, Fe, Mg, Mn, Na, O, Pb, S, Si and Zn elements were identified. A model for the origin of impurities follows: Selenite stopped growing when the solution became sub-saturated. Then, hematite was deposited as the main phase, which was dissolved or suspended in the solution. Hematite matrix served for the adsorption of other crystalline and amorphous phases. We concluded that humans have not produced the impurities, which are witnesses of the gypsum crystals formation. Acknowledgment: Stanford Synchrotron Radiation Lightsource, Harvard Museum of Natural History and CONACYT CB-183706.

Double percolation effect on the electrical conductivity of conductive particles filled polymer blends

1992 ◽  
Vol 270 (2) ◽  
pp. 134-139 ◽  
Author(s):  
M. Sumita ◽  
K. Sakata ◽  
Y. Hayakawa ◽  
S. Asai ◽  
K. Miyasaka ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Polymer Blends ◽  
Filled Polymer ◽  
Percolation Effect ◽  
Double Percolation ◽  
Conductive Particles

scholarly journals Scanning Transmission Electron Microscopy for Polymer Blends

2017 ◽  
Vol 4 (1) ◽  
pp. 31-36
Author(s):  
Pradeep Singh ◽  
B. R. Venugopal ◽  
Radha Kamalakaran
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Polymer Blends ◽  
Scanning Transmission Electron Microscopy ◽  
Critical Role ◽  
Polymer Materials ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Butadiene Styrene

Physical properties of the polymer can be altered by mixing one or more polymers together also known as polymer blending. The miscibility of polymers is a key parameter in determining the properties of polymer blend. Conventional transmission electron microscopy (CTEM) plays a critical role in determining the miscibility and morphology of the polymers in blend system. One of the most difficult part in polymer microscopy is the staining by heavy metals to generate contrast in CTEM. RuO4 and OsO4 are commonly used to stain the polymer materials for CTEM imaging. CTEM imaging is difficult to interpret for blends due to lack of clear distinction in contrast. Apart from having difficulty in contrast generation, staining procedures are extremely dangerous as improper handling could severely damage skin, eyes, lungs etc. We have used scanning transmission electron microscopy (STEM) to image polymer blends without any staining processes. In current work, Acrylonitrile Butadiene Styrene (ABS)/Methacrylate Butadiene Styrene (MBS) and Styrene Acrylonitrile (SAN) along with filler additive were dispersed on Polycarbonate (PC) matrix and studied by STEM/HAADF (high angle annular dark field). By using HAADF, contrast was generated through molecular density difference to differentiate components in the blend.

Carbon Nanotubes Functionalized by Nanoparticles of Platinum

2014 ◽  
Vol 793 ◽  
pp. 45-50 ◽  
Author(s):  
S. Capula-Colindres ◽  
K. Aguir ◽  
F. Cervantes-Sodi ◽  
L.A. Villa-Vargas ◽  
Vicente Garibay-Febles
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Gas Sensors ◽  
Pt Nanoparticles ◽  
Quick Response ◽  
Heterogeneous Distribution ◽  
Best Response ◽  
Transmission Electron

Carbon nanotubes (CNT) based gas sensors have attracted interest due to their excellent properties. Several studies have reported changes in the CNT’s electrical properties when functionalized with platinum (Pt) nanoparticles. In this investigation, the vapor phase impregnation decomposition (VPID) method was employed to incorporate Pt nanoparticles on CNT. Both, Pt nanoparticles and CNT were characterized by high resolution transmission electron microscopy (HR-TEM). The sensitivity of sensors based on CNT doped with Pt, was evaluated with ozone molecules. TEM images showed low and heterogeneous distribution on the surface of carbon nanotubes. The gas evaluation of CNT-Pt sensor presents good and quick response to ozone molecules at different concentrations and temperatures. The best response was found to be at 120 °C.

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