Core samples, electron micrographs

Figure 1. Electron micrographs of Berea sandstone and selected core samples (a) Berea sandstone, representative fracture surface, 102.75X (h) Berea sandstone, clay on quartz crystals, 959X (c) Glenn sand core, representative fracture surface, 123.3X (d) Glenn sand core, clay crystals on quartz, 3938.75X (e) San Andres core, representative fracture surface, 123.3X (f) San Andres core, clay and dolomite crystals, 993.25 X.

It is clearly to be seen from electron micrographs that the conversion of carbon spiroids into nano-onions really proceeds from the core to the periphery. They show entirely spiral objects at first. These are transformed into completely concentric onions via the hybrid form of an onion core with a spiral shell (Figure 4.30). It is presumably even just a part of the spiroid structures actually present in the sample that are detected in these examinations as their projections appear onion-like at unfavorable orientation. 

Fig. 16. Scanning electron micrographs of the fracture surfaces of a PET/LC-50 injection molded plaque. The sample was fractured along and across the flow direction and, the micrographs represent skin and core regions in the plaque.

In complete analogy with the case of metadislocations in Sg-Al-Pd-Mn (Section 4.4), series of metadislocations with other numbers of associated phason halfplanes can be constructed. Fig. 40 is a transmission electron micrograph showing two metadislocations in a sample region similar to that of Fig. 39(a). The left metadislocation is associated with five phason halfplanes and that on the right with eight phason halfplanes. In the areas directly below both metadislocation cores, regions of -structure are identified. 

Figure 14.2 Transmission electron micrographs taken from various locations of an injection-molded component. CrystaUine morphology differences between the skin, the intermediate region, and the core of the sample are compared.

FIGURE 13 (A) Schematic illustration of an optical fiber tip used for NSOM. The fiber is drawn to a sharp point and coated with a metal, such as aluminum, to keep the light confined to the fiber core. Radiation emerges from the small aperture at the end of the tip and interacts with the sample. The radiation intensity decreases rapidly with distance in the Z direction. (B) Electron micrographs of aluminum-coated NSOM tips that have been flattened and polished by focused ion beam milling. [Reprinted with permission from Veerman, J. A., Otter, A. M., and van Hulst, N. F. (1998). Appl. Phys. Lett. 72, 3115-3117.]... 

Figure 6-2 presents a transmission electron micrograph of a commercial hollow sphere opacifying aid. The sample is presented as seen from above, with the polymer shells appearing as a dark rings and the voids as the lighter cores. The particle size is quite uniform with particle diameters of roughly 300 nm. 

Fig. 6.2 Transmission Electron Micrograph of a Hollow Sphere Opacifying Aid. Sample was prepared by diluting polymer dispersion with water and then drying a small quantity on an electron microscope sample grid. Contrast was increased by staining with RUO4. Particles are approximately 300 nm in diameter. Polymer shells appear as dark rings, and the hollow cores appear as the light areas within the rings.

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