Cu Cylinders and Rods

Colloidal Cu particles are prepared as described above by chemical means. An overview image of such rods is given in Figure 19. Tilt series have been performed around the long axis of the needle. Two typical patterns were observed. Figure 20 shows such a series from top to bottom, +36°, 0°,

Figure 17. Computer simulation consisting of seven shells, 1415 atoms (top) and electron micrograph (bottom) of a Cu icosahedron viewed along the 3-fold axis.

Figure 15. Model of an icosahedron consisting of seven shells, 1515 atoms.

Figure 17. Computer simulation consisting of seven shells, 1415 atoms (top) and electron micrograph (bottom) of a Cu icosahedron viewed along the 3-fold axis.

Figure 18. Computer simulation consisting of seven shells, 1415 atoms (top) and electron micrograph (bottom) of a Cu icosahedron viewed along the 2-fold axis.

—36°, together with the PS. As can be seen from the image and from the PS, a repetition of the pattern is performed. Figure 21 shows a tilt series around +18° and —18° from top to bottom. Here lattice lines are shown only on the left-hand side for +18° tilt and on the right-hand side for the — 18° tilt. The PS, however, are the same. In Figure 22 a high-resolution image of the zero tilt together with the PS is shown. Three pairs of equatorial reflections are shown, marked 1, 2, 3. In addition, five other reflection pairs outside the equator (marked 4-8) exist. The corresponding lattice parameters are d1 — o.211 nm, d2 — o.332 nm, d3 — o.566 nm, d4 — d7 — o.184 nm, d5 — d6 — o.252 nm, d8 — o.148 nm, with an accuracy of ±2%. The data of reflec-

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