Carbon wires

C.G. Wu and T. Bein, Conducting Carbon Wires in Ordered, Nanometer-Sized Channels. 

V. Another method of avoiding introduction of the tungsten wire (which is used as a substratum in all previously described vapor deposition processes) into the product reverses the above procedure l.e., a carbon wire is heated to incandescence in the vapor of a volatile halide of the metal (in the presence or in the absence of Ha). 

Figure 32.2 Fabrication of conducting carbon wires from poiyac ionitrile precursor in MCM-41 pores.

FIGURE 15 Schematic representation of the formation of carbon wires in the MCM-41 channel host [50]. 

The large uniform-shaped cavities of mesoporous molecular sieves can provide many interesting possibilities for the fabrication and hosting of quantum-sized particles. An example is the fabrication of stable carbon wires in the pore structure of mesoporous materials by polymerizing acrylonitrile within the channels. It is also possible to fill the mesopores with a semiconductor such as germaiuum. This type of molecular and quantum wires may have many... 

Yao, H. Sabat, M. Grimes, R. N. de Biani, F. F Zanello, P. 2003b. Metallacarborane-based nanostructures A carbon-wired planar octagon. Angew. Chem. Int. Ed., 42 1002-5. 

The third type of electrode that involves only a single dimension of diffusion is the cylindrical electrode, and the diffusion equation is shown in Table 15.1 (equation T13). Practical electrodes with such a geometry are made by fine metal or carbon wires connected to a conducting bigger wire with silver epoxy.Their behavior, therefore, falls within the category of MEs. Theoretical relationships for predicting current responses at such geometry will be considered in more detail in the MEs section. 

Composites (carbon—carbon, wire or fiber reinforced bone cement) Strong, tailor made Difficult to make loint implants, heart valves... 

Use the apparatus detailed in Section 111,20. Dissolve 100 g. (123 ml.) of methyl n-butyl ketone (2-hexanone) (Section 111,152) in 750 ml. of ether and add 150 ml. of water. Introduce 69 g. of clean sodium in the form of wire (or small pieces) as rapidly as possible the reaction must be kept under control and, if necessary, the flask must be cooled in ice or in running water. When all the sodium has reacted, separate the ethereal layer, wash it with 25 ml. of dilute hydrochloric acid (1 1), then with water, dry with anhydrous potassium carbonate or with anhydrous calcium sulphate, and distil through a fractionating column. Collect the fraction of b.p. 136-138°. The yield of methyl n-butyl carbinol (2-hexanol) is 97 g. 

Dissolve 180 g. of commercial ammonium carbonate in 150 ml. of warm water (40-50°) in a 700 ml. flask. Cool to room temperature and add 200 ml. of concentrated ammonia solution (sp. gr. 0 88). Introduce slowly, with swirling of the contents of the flask, a solution of 50 g. of chloroacetic acid (Section 111,125) in 50 ml. of water [CAUTION do not allow chloroacetic acid to come into contact with the skin as unpleasant burns will result]. Close the flask with a solid rubber stopper and fix a thin copper wire to hold the stopper in place do not moisten the portion of the stopper in contact with the glass as this lubrication will cause the stopper to slide out of the flask. Allow the flask to stand for 24-48 hours at room temperature. Transfer the mixture to a distilling flask and distil in a closed apparatus until the volume is reduced to 100-110 ml. A convenient arrangement is to insert a drawn-out capillary tube into the flask, attach a Liebig s condenser, the lower end of which fits into a filter flask (compare Fig.//, 1) and connect the... 

The formation of an organosodium compound (p-tolyl-sodium) is well illustrated by the interaction of sodium sand or wire with p-chlorotoluene in light petroleum (b.p. 40-60°) at about 25°, for when the reaction mixture is added to excess of solid carbon dioxide pure/ -toluic acid is obtained directly in a yield exceeding 70 per cent. ... 

Cholestenone. Place a mixture of 1 0 g. of purified cholesterol and 0-2 g. of cupric oxide in a test-tube clamped securely at the top, add a fragment of Dry Ice in order to displace the air by carbon dioxide, and insert a plug of cotton wool in the mouth of the tube. Heat in a metal bath at 300-315° for 15 minutes and allow to cool rotate the test-tube occasionally in order to spread the melt on the sides. Warm with a few ml. of benzene and pour the black suspension directly into the top of a previously prepared chromatographic column (1) rinse the test-tube with a little more benzene and pour the rinsings into the column. With the aid of shght suction (> 3-4 cm. of mercury), draw the solution into the alumina column stir the top 0 -5 cm. or so with a stout copper wire to... 

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