Silver encapsulation

Li W, Virtanen J A and Penner R M 1995 Self-assembly of n-alkanethiolate monolayers on silver nanostructures protective encapsulations Langmu/r 11 4361... 

The positive plates are siatered silver on a silver grid and the negative plates are fabricated from a mixture of cadmium oxide powder, silver powder, and a binder pressed onto a silver grid. The main separator is four or five layers of cellophane with one or two layers of woven nylon on the positive plate. The electrolyte is aqeous KOH, 50 wt %. In the aerospace appHcations, the plastic cases were encapsulated in epoxy resins. Most usehil cell sizes have ranged from 3 to 15 A-h, but small (0.1 A-h) and large (300 A-h) sizes have been evaluated. Energy densities of sealed batteries are 26-31 W-h/kg. 

E.l You have become very excited about the possibilities of nanotechnology, especially the creation of fibers one atom wide. Suppose you were able to string together 1.00 mole of silver atoms, which have a radius of 144 pm, by encapsulating them in carbon nanotubes (see Box 14.1). How long could the fiber extend ... 

Syntheses and luminescence studies of mixed-metal gold(I)-copper(l) and -silver (I) alkynyl complexes. The tuming-on of emission upon d metal ion encapsulation. Dalton Transactions, 1830-1835. 

Their antimicrobial activities were found to be improved compared with those of silver(i) nitrate. Encapsulation of 69 by electrospun tecophilic nanofibres for the formation of antimicrobial nanosilver particles was also achieved. 

Zheng, J., and Dickson, R.M. (2002) Individual water-soluble dendrimer-encapsulated silver nanodot fluorescence./. Am. Chem. Soc. 124, 13982-13983. 

Fig. 10 (a) Fluorescence image of methanol-fixed NIH3T3 cells loaded with peptide encapsulated silver clusters for 1 h at room temperature, (b) Time profile of the time series images of cell stained with silver nitrate showing the fast silver cluster emission centered in the nucleus at short times with a maximum at 320 nm. Note that black indicates an intermediate intensity level in this color scheme [57]... 

Yu J, Patel Sandeep A, Dickson RM (2007) In vitro and intracellular production of peptide-encapsulated fluorescent silver nanoclusters. Angew Chem Int Ed 46 2028-2030... 

Li et al. reported first on the decoration of hydrothermal carbon spheres obtained from glucose with noble metal nanoparticles [19]. They used the reactivity of as-prepared carbon microspheres to load silver and palladium nanoparticles onto then-surfaces, both via surface binding and room-temperature surface reduction. Furthermore, it was also demonstrated that these carbon spheres can encapsulate nanoparticles in their cores with retention of the surface functional groups. Nanoparticles of gold and silver could be encapsulated deep in the carbon by in situ hydrothermal reduction of noble-metal ions with glucose (the Tollens reaction), or by using silver nanoparticles as nuclei for subsequent formation of carbon spheres. Some TEM images of such hybrid materials are shown in Fig. 7.4. 

Fig. 7.4 (a) Carbon spheres loaded with silver nanoparticles at room temperature (b) carbon spheres loaded with palladium nanoparticles by refluxing (c) silver core of carbon spheres from encapsulation of silver nanoparticle seeds, (d) layered structure with an silver core, a platinum shell, and a carbon interlayer, formed by seeded encapsulation followed by the reflux method. 

Fig. 7.5 (a) Typical SEM image of the nanoscaie with encapsulated, silver nanowires. The insert shows an incompletely drilled tube with a pentagonal cross-section, (b) TEM image of typical silver-carbon nanocables formed after treating at 160 °C for 12 h 5 g starch, 5 mmoi AgN03, pH 4. 

Schaller, M., Korting, H. C. and Schmid, M. H., Interaction of cultured human keratinocytes with liposomes encapsulating silver sulphadiazine proof of the uptake of intact vesicles. Br. J. Dermatol, 134, 445-50, 1996. 

The complexation of anionic species by tetra-bridged phosphorylated cavitands concerns mainly the work of Puddephatt et al. who described the selective complexation of halides by the tetra-copper and tetra-silver complexes of 2 (see Scheme 17). The complexes are size selective hosts for halide anions and it was demonstrated that in the copper complex, iodide is preferred over chloride. Iodide is large enough to bridge the four copper atoms but chloride is too small and can coordinate only to three of them to form the [2-Cu4(yU-Cl)4(yU3-Cl)] complex so that in a mixed iodide-chloride complex, iodide is preferentially encapsulated inside the cavity. In the [2-Ag4(//-Cl)4(yU4-Cl)] silver complex, the larger size of the Ag(I) atom allowed the inner chloride atom to bind with the four silver atoms. The X-ray crystal structure of the complexes revealed that one Y halide ion is encapsulated in the center of the cavity and bound to 3 copper atoms in [2-Cu4(//-Cl)4(//3-Cl)] (Y=C1) [45] or to 4 copper atoms in [2-Cu4(/U-Cl)4(/U4-I)] (Y=I) and to 4 silver atoms in [2-Ag4(/i-Cl)4(/i4-Cl)] [47]. NMR studies in solution of the inclusion process showed that multiple coordination types take place in the supramolecular complexes. 

Menaker Are you really convinced that there is a one-to-one relationship between electrical activity in the SCN and behaviour You kind of assumed this, but I don t think the evidence is very good. Work from Rae Silver s lab in which the SCN transplants are encapsulated, and therefore can t make electrical... 

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