Crystal structure, thin films 3-carbon atoms

Details about preparation and characterization of dispersed microcrystals can be found in review chapters [322] and will not be dealt with here. All investigations indicate that the properties of microcrystals differ considerably from those of bulk metals (and from those of adatoms and thin films as well) [328], and that they can also be influenced by the nature and texture of the support. In particular, micro-deposits of precious metals on various inert supports (Ti, Ta, Zr, Nb, glassy carbon etc.) exhibit enhanced electrocatalytic effects as evaluated per metal atom, while the mechanism of H2 evolution remains the same [329], and the enhancement increases as the crystallite size decreases [326, 331] (Fig. 17). However, while this is the case with Rh, Pt, Os and Ir, Pd shows only an insignificant increase, whereas for Ru even a drastic decrease is observed [315, 332]. Thus, the effect of crystal size on the catalytic activity appears to depend on the nature of the catalyst (without any relation with the crystal structure group) [330]. 

The densely packed organic thin films of alkanes tend to exhibit alterations of the network structures, depending on the parity of the number of the methylene units—a result called the odd-even effectP Binary mixtures of primary linear alcohols that differ by one methylene group show ideal mixing if the shorter alcohol possesses an odd number of carbon atoms. In contrast, if the shorter component is even numbered, co-crystals are formed. The appearance of mixing (random or ordered) on the surface rather than phase separation is ascribed to the similar symmetries of the unit cells of the pure components. ... 

---