Static high temperature conductivity cells

Figure 4.1 Alternating current static high temperature conductivity cell (Ho, P.C., Palmer, D.A. and Mesmer, R.E. (1994). J. Solution Chem. 23, 997 with permission from Elsevier).

Static high temperature and pressure conductivity cells... 

A number of static high temperature cells were developed later for electrical conductivity. Some of them have been used for measiuements at temperatures below the critical temperature of water. Thus, Khitarov et al. (1963), EUis... 

The first measurements of the electrical conductivity of aqueous electrolytes at high temperature were performed 100 years ago by Noyes and co-workers at MIT (Noyes et al., 1903, 1907, 1910a, 1910b) using a high-pressiue platimun-lined steel vessel. The body of the cell is one of the electrodes, while two others platimun electrodes were located in the upper and lower part of the vessel and insulated from it by mica and quartz washers. The solution is filled into the cell and it remains static diuing the measiue-ment performed near saturation with vapor phase. The platimun electrode on the vessel wall was in contact with the liquid and vapor phase and the conductivity of the solution was measured between this electrode and the electrode at the bottom vessel. The third electrode at the upper part of the cell was in contact with the vapor phase and it allowed determining the voliune of the sample. 

Recently, the Oak Ridge s static conductivity cell was modified (Ho et al., 2000a 2000b 2001) and converted into a flow-trough cell able to operate with high accuracy at densities lower than 0.4 g cm l So far, the maximum temperature achieved was 410°C and the maximum pressure was 33 MPa, but it is expected that the cell could operate up to 600 °C and 300 MPa. 

In l02) the authors describe the design of an experimental plant for studies of acoustic cavitation in flowable high polymers with the help of optic methods the plant employs a flat-slit transprent-wall capillary acoustic treatment of a polymer was carried out at a frequency of 17.8 kHz, and amplitude of vibration between 0 and 15 mcm. The study was conducted on 1,2 polybutadienes of narrow molecular-mass distribution tests were arranged at room temperature. It has been demonstrated that static mechanical stresses occur in a stationary (non-flowing) polymer under the action of acoustic treatment isochrome lines in the viscosimetric tank form a cellular structure with cell size of about 1-3 mm, and in the capillary the isochromes are observed in form of longitudinal strips (Fig. 19). The authors have also found that acoustic... 

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