Replicas preparation

Fig 1. Electron micrograph of a platinum/carbon replica prepared by the fast-freeze, deep-etch, rotary-shadow replica technique printed in reverse contrast. Cell walls of onion parenchyma have an elaborate structure with many thin fibres bridging between thicker cellulosic microfibrils. Scale bar represents 200nm. 

Figure 3. Electron micrographs of native xanthan sample E. The electron micrographs were obtained from replicas prepared as described in Figure 1. Scale bar = 200 nm.

Figure 2. Ultrastructural aspects of M813 virus-induced ceii fusion as shown by replica preparation technique, (a) Cell surface replica of a PA317 fibroblast after incubation for 30 min at 4°C with medium containing M813 virus. Numerous microvilli extend from the slightly folded cell surface. The...

Tsuge, Y., K. Inokuchi, K. Onozuka, O. Shingo, S. Sugi, M. Yoshikawa and S. Shiratori (2006). Fabrication of porous Ti02 films using a spongy replica prepared by layer-by-layer self-assembly method Application to dye-sensitized solar cells. Thin Solid Films, 499(1-2), 396—401. 

Figure 2.26 Replicas prepared from fracture surfaces and viewed in TEM. (a) River patterns of a brittle failure of a steel fastener (b) fine, equiaxed ductile dimples on the surface of a tensile fracture of high-strength steel. The small carbide particles where local rupture and void formation initiated are apparent. (Reprinted with permission from ASM International. All rights reserved www.asminternational.org)...

Figure 4.4 XRD patterns of (a) zeolite EMC-2, (b) carbon repUca prepared by furfuryl alcohol infiltration and propylene CVD and (c) carbon replica prepared by furfu l alcohol infiltration, propylene CVD and heat treatment at 900 °C under argon. Reprinted with permission from F.O.M. Gaskin, J. Parmentier, V.P. Valtchev and J. Patarin, Chem. Commun., 991. Copyright (2006) Royal Society of Chemistry...

Surface replicas prepared on carbon supports using gold-palladium shadowing, a) 25% PPO b) 50% PPO c) 75% PPO. Reproduced with permission from Tkacik (Ref. 7b)... 

Figure 13.9 TEM images and energy dispersive X-ray spectroscopy (EDX) spectrum of mesoporous WS2-SBA-15 replicas prepared via a high-temperature reductive sulfuration method with H2S gas at600°C (a) low-magnification TEM image (b) high-magnification TEM image ...

FIGURE 3.11 SEM images of the colloidal silica composite templates (insets) and the corresponding carbon replicas prepared by (a) volume templating and (b) surface templating, using 250 nm silica spheres. (Reprinted with permission from Yu, J. S. et al. 2002. Fabrication of ordered unifrom porous carbon networks and thir application to a catalyst supporter. Journal of the American Chemical Society 124 9382-9383. Copyright (2002). The American Chemical Society.)... 

Shadowed platinum Platinum carbon replica carbon replica preparation removing in solvent... 

Figure 4.9 TEM micrographs recorded on a platinum shadowed replica prepared by FFET. (a) Sample prepared on 5 % dispersion of overbased calcium didodecylbenzene sulfonate in dodecane. Spherical nanoparticles of 10 nm diameter are easily visible, (b) Extractive replica prepared on the same dispersion. (c) X-ray analysis of the selected area (black circle) reveals the composition of the particles (Ca, S, O) corresponding to the sulfonate. The presence of Pt is due to the shadowing layer and copper to the copper support grid, (d) Radial distribution functions (from EXAFS studies) uncorrected from phase shifts obtained on caldte, and two OCABS dispersions in oil. The presence of a single peak corresponding to the first Ca-0 distance points out the amorphous structure of the mineral part of the OCABS particles...

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