Carbon rod

The porous carbon rod is often the main pathway of escape for the gases formed in the cell. This pathway also allows ingress of oxygen to the cell limiting the shelf life of the system. The use of shrink tube outer wrapping and other devices have, however, improved the leakage property dramatically over prior generation cells. 

Carbon soot from resistive heating of a carbon rod in a partial helium atmosphere (0.3bar) under specified conditions is extracted with boiling C H or toluene, filtered and the red-brown soln evapd to give crystalline material in 14% yield which is mainly a mixture of fullerenes C q and C70. Chromatographic filtration of the crude mixture with allows no separation of components, but some separation was observed on silica gel... 

Kohlen-ozydvergiftung, /. carbon monoxide poisoning, -oxysulfid, n, carbon oxysulfide. -papier, n. carbon paper, -pres (s)stein, m, coal briquet, -puWer, n, coal powder, powdered coal charcoal powder, powdered charcoal, -puppe, /, (Elec.) carbon rod, -riick-stand, m. carbon residue, -sandstein, m. carboniferous sandstone. 

Kohle-rohx, n., -rohre,/. carbon tube, -schwe-lung, /. coal distillation, -stab, m. carbon rod. -Stahl, m. carbon steel, ordinary steel, -staub, m. coal dust charcoal diist. 

An electron on the left carbon rod is gone another electron has shown up at the right carbon rod. 

Zn - Mn02 batteries [2] dominate the world s small-format battery industry. In 1995 Zn-carbon batteries (the carbon rod in the center of Leclanche cells is the reason for this name) comprised 67 percent of the world market, and the other 33% belonged to alkaline cells (Table 1). 

The "classical" Leclanche cell uses zinc sheet formed into a cylindrical can serving simultaneously as the anode and as the cell container (AB1C1). The cathode is a mixture of Mn02 and graphite wrapped into a piece of separator and contacted by a central carbon rod. The can dissolves slowly when the cell is not in use and faster when the cell delivers electrical energy. The reaction following the primary electrochemical zinc dissolution [Eq. (19)] leads, in the case of an ammonium chloride electrolyte, to a zinc diammine cation ... 

A carbon rod is used as a current collector for the positive electrode in dry cells. It is made by heating an extruded mixture of carbon (petroleum coke, graphite) and pitch which serves as a binder. A heat treatment at temperatures of about 1100 °C is used to carbonize the pitch and to produce a solid structure with low resistance. For example, Takahashi [23] reported that heat treatment reduced the specific resistance from 1 Q cm to 3.6xlO"1Qcm and the density increased from 1.7 to 2.02 gem- 1. Fischer and Wissler [24] derived an experimental relationship [Eq. (1)] between the electrical conductivity, compaction pressure, and properties of graphite powder ... 

The reactions of the butadiynediyldimetal(Fe, Ru) complexes with Fe2(CO)ci at room temperature afforded mixtures of products, from which three types of products, viz. the ps-acetylide cluster compound 4, the pj-ti -propargylidene-ketene compound 5 and zwitterionic cluster compound 6, were isolated. While the reaction with an excess amount of Co2(CO)g results in addition to the sterically congested Fp -C=C part [6]. The distributions of the products were dependent on the metal fragments situated at the other end of the conjugated carbon rod. The cluster compounds so obtained were characterized by spectroscopic and... 

Kubaslk, N. P. and Volosln, M. T. "A Simplified Determination of Urinary Cadmium, Lead, and Thallium, with Use of Carbon Rod Atomization and Atomic Absorption Spectrophotometry . Clin. Chem. (1973), 19, 954-958. 

Maessen, F. J. M. J., and Posma, F. D. "Fundamental Aspects of Flameless Atomic Absorption Using the Mini-Massmann Carbon Rod Atomizer". Anal. Chem. (1974), 46, 1439-1444. 

Matousek, J. P. and Stevens, B. J. "Biological Applications of the Carbon Rod Atomizer in Atomic Absorption Spectroscopy". Clin. Chem. (1971), J7, 363-368. 

Figure 5. A carbon plate and a carbon rod. Both are attached to a handle...

Carbon rods with one end filed to a conical shape make very good... 

For tooling of molten Vitreosil inch Nichrome wire may be employed though if much tooling is required, then carbon rods or plates are necessary. In general, most of the operations described in earlier chapters can be modified for working with Vitreosil and, if a sufficiently hot flame is available, less manipulative skill is usually necessary because the material stays fairly viscous. 

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