Silver sheet

Electrodes. AH of the finished silver electrodes have certain common characteristics the grids or substrates used in the electrodes are exclusively made of silver, although in some particular cases silver-plated copper is used. Material can be in the form of expanded silver sheet, silver wire mesh, or perforated silver sheet. In any case, the intent is to provide electronic contact of the external circuit of the battery or cell and the active material of the positive plate. Silver is necessary to avoid any possible oxidation at this junction and the increased resistance that would result. 

Both steel and copper vessels may be lined with thin silver sheets in the same way as for homogeneous lead lining. As silver is extremely resistant to most organic acids at all concentrations and temperatures, it is used widely for handling foodstuffs and pharmaceutical products where nontoxicity and... 

The silver-silver chloride RE consists of a small length of silver wire or piece of silver sheet coated with a thin layer of silver chloride (this layer can be deposited by anodic polarization of the silver in chloride-contaiifing solution) and dipping into HCl or KCl solutions of defined concentration its E° = 0.2224 V. 

The reference electrode(s) carries no net current and has a charged species in equilibrium between it and the electrolyte. The schematic form of such an arrangement is shown in Fig. 10.9 where the reference electrode is a silver wire inserted into Ag4Rbl5 which is, in turn, between two silver sheets which constitute the working and subsidiary electrodes. 

The aquatic samples in 8 M HN03 are evaporated and the dry residue is dissolved in 20 mL 0.5 M HC1. After the addition of approximately 50 mg of ascorbic acid (reduction of Fe3+ to Fe2+), the solution is transferred to PTFE vessels equipped with a silver sheet bottom. Polonium is electrodepos-ited at 90°C for 4 h.34-36... 

In the free space between the inner vessel and the outer box, resistance wires are placed to heat the electrolyzer at the start of the process. After the electrolyte has reached a sufficient temperature the electrical heating is disconnected and air, heated to some 230—250 °C, is blown into the space to keep a constant temperature in the bath during the electrolysis. 6 graphite anodes and 7 cathodes made of perforated silver sheet are alternately suspended in the inner vessel. Both cathodes and anodes are inserted into special diaphragms made of electron and perforated at the bottom. They enclose in the form of bells each electrode. The gases liberated during electrolysis are taken off at the top of the bells. The whole assembly of anodes and cathodes is covered by an electron cover. 

Silver sheet or coin, Ag Silver sulphate, Ag2S04 Soda lime... 

Figure 34. Electron micrograph of bleached silver sheet.

Silver electrodes have been employed in form of an expanded silver sheet on a plastic plate in the dehalogenation of polyhalogenated heterocyclic compounds examples are given in Chapter 18. 

Borcher s process. An electrolytic method for refining silver by using silver sheet cathodes and dilute nitric acid electrolyte. 

The Silver Sheet. Chevy Chase, MD FDC Reports. Monthly. ISSN 1093-28IX. Available electronically. Provides information on the FDA s interpretation and application of the FDA s Medical Device Quality System Final Rule. Focuses on quality control, manufacturing compliance and design issues affecting the medical device and diagnostics industries. 

As anodes have become larger, it has become much more difficult to cast the anodes to the preferred shape. Rolled lead-silver or rolled lead-calcium-silver sheets have been utilized alternatively in some tankhouses to form these jumbo anodes. The surfaces of the rolled anodes are much smoother than those of the cast anodes generating fewer places for the oxides to adhere. In addition, the texture is oriented in the rolling direction, producing a grain stmcture even more difficult to corrode and to form an adherent layer of Pb02... 

The shown calorimeter has an accuracy of +0.1% and a temperature range of 170 to 600 K. A sample of 100-300 g is placed in two sets of silver trays, one outside and one inside a cylindrical heater. In the middle of the sample, the tip of the platinum resistance thermometer can be seen. Sample trays, thermometer, and heater are enclosed in a rounded steel shell, which for ease of temperature equilibration is filled with helium of less than one pascal pressure. The shell is covered with a thin silver sheet on the outside, gold-plated to reduce radiation losses. The calorimeter is then hung in the middle of the adiabatic jacket, drawn in heavy black. This adiabatic jacket is heated by electrical heaters and cooled by a cold gas flow, as indicated by the dials of the instmments pictured on the left at the bottom. The whole assembly, calorimeter and adiabatic jacket, is placed in a sufficient vacuum to avoid convection. 

BCE Standardized weights used in Sumeria. Silver sheet-metal working is carried out. 

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