Silver, structure

Dankov (65) has suggested that the activity of the silver/silver bromide interface may be enhanced as a result of a unique circumstance which exists if cube faces of the silver and silver bromide are joined. The positions of silver atoms in the cube face of the silver structure almost exactly match the positions of the silver and bromide ions in the cube face of the silver bromide structure when one of these faces is... 

Liao PF. Silver structures produced hy microlithography. In Chang RK, Furtak TE (Eds), Surface Enhanced Raman Scattering. Plenum Press, New York, 1982, pp. 379-390. 

Kahl M, Voges E (2000) Analysis of plasmon resonance and surface enhanced Raman scattering on periodic silver structures. Phys Rev B 61 14078... 

Colloidal inks containing 5-7 nm particles of gold and silver in an organic solvent, i.e., a-terpmeol, cf.. Figure 4.5, can be used to build electrically and mechanically functional metallic structures. After sintering at 300°C the resistivity of printed silver structures was found to about twice that of bulk silver (33). 

J. R. (2003) Fractal silver structures for metal-enhanced fluorescence applications for ultra-hright surface assays and lah-on-a-chip-hased nanotechnologies. Journal of Fluorescence, 13,119-22. 

Fig. 4 Femtosecond laser written structures with a complicated material recipe, a A 3D spiral structure within silver-doped sol-gel materials. The latent image was produced using multiple exposures with an 800-nm, 120 fs laser, b Image of the actual 3D silver structure fabricated in a nanoparticle-seeded polymer nanocomposite by two-photon laser exposure the upper image was reconstructed from a series of two-photon fluorescence microscopy images obtained at various depths in the sample and the lower SEM image of the free-standing 3D silver structure is the same as the upper one after removal of unexposed material using dichloromethane...

Surface heterogeneity may be inferred from emission studies such as those studies by de Schrijver and co-workers on P and on R adsorbed on clay minerals [197,198]. In the case of adsorbed pyrene and its derivatives, there is considerable evidence for surface mobility (on clays, metal oxides, sulfides), as from the work of Thomas [199], de Mayo and co-workers [200], Singer [201] and Stahlberg et al. [202]. There has also been evidence for ground-state bimolecular association of adsorbed pyrene [66,203]. The sensitivity of pyrene to the polarity of its environment allows its use as a probe of surface polarity [204,205]. Pyrene or ofter emitters may be used as probes to study the structure of an adsorbate film, as in the case of Triton X-100 on silica [206], sodium dodecyl sulfate at the alumina surface [207] and hexadecyltrimethylammonium chloride adsorbed onto silver electrodes from water and dimethylformamide [208]. In all cases progressive structural changes were concluded to occur with increasing surfactant adsorption. 

Figure Bl.22.6. Raman spectra in the C-H stretching region from 2-butanol (left frame) and 2-butanethiol (right), each either as bulk liquid (top traces) or adsorbed on a rough silver electrode surface (bottom). An analysis of the relative intensities of the different vibrational modes led to tire proposed adsorption structures depicted in the corresponding panels [53], This example illustrates the usefiilness of Raman spectroscopy for the detennination of adsorption geometries, but also points to its main limitation, namely the need to use rough silver surfaces to achieve adequate signal-to-noise levels.

Gordon J G, Melroy O R and Toney M F 1995 Structure of metal-electrolyte interfaces copper on gold(111), water on silver(111) Electrochim. Acta 40 3-8... 

The chromates of the alkali metals and of magnesium and calcium are soluble in water the other chromates are insoluble. The chromate ion is yellow, but some insoluble chromates are red (for example silver chromate, Ag2Cr04). Chromates are often isomorph-ous with sulphates, which suggests that the chromate ion, CrO has a tetrahedral structure similar to that of the sulphate ion, SO4 Chromates may be prepared by oxidising chromium(III) salts the oxidation can be carried out by fusion with sodium peroxide, or by adding sodium peroxide to a solution of the chromium(IIl) salt. The use of sodium peroxide ensures an alkaline solution otherwise, under acid conditions, the chromate ion is converted into the orange-coloured dichromate ion ... 

Ordinary tin is composed of nine stable isotopes 18 unstable isotopes are also known. Ordinary tin is a silver-white metal, is malleable, somewhat ductile, and has a highly crystalline structure. Due to the breaking of these crystals, a "tin cry" is heard when a bar is bent. 

As well as the cr-complexes discussed above, aromatic molecules combine with such compounds as quinones, polynitro-aromatics and tetra-cyanoethylene to give more loosely bound structures called charge-transfer complexes. Closely related to these, but usually known as Tt-complexes, are the associations formed by aromatic compounds and halogens, hydrogen halides, silver ions and other electrophiles. 

In TT-complexes formed from aromatic compounds and halogens, the halogen is not bound to any single carbon atom but to the 7r-electron structure of the aromatic, though the precise geometry of the complexes is uncertain. The complexes with silver ions also do not have the silver associated with a particular carbon atom of the aromatic ring, as is shown by the structure of the complex from benzene and silver perchlorate. ... 

Mercuric halides, silver nitrate, and copper nitrates form stable complexes with bis-2.2 -thiazolylazo compounds (1591). for which the X-ray structure is not yet known. 

The structure of compound A was established in part by converting it to known compounds Treat ment of A with excess methyl iodide in the presence of silver oxide followed by hydrolysis with dilute hydrochlonc acid gave a tnmethyl ether of D galactose Companng this trimethyl ether with known trimethyl ethers of D galactose allowed the structure of compound A to be deduced... 

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