Electrical conductimetry

Although NMR results provide perhaps the most convincing evidence of the bicontinuous structure of some microemulsions, many other techniques support their existence. These techniques include electrical conductimetry, x-ray and neutron scattering, quasielastic light scattering, and electron... 

The several experimental methods allow a wide range of relaxation times to be studied. T-Jump is capable of measurements over the time range 1 to 10 s P-jump, 10 to 5 X 10" s electric field jump, 10 to 10 s and ultrasonic absorption, 10 to 10 " s. The detection method in the jump techniques depends upon the systems being studied, with spectrophotometry, fluorimetry, and conductimetry being widely used. 

Electrical methods of analysis (apart from electrogravimetry referred to above) involve the measurement of current, voltage or resistance in relation to the concentration of a certain species in solution. Techniques which can be included under this general heading are (i) voltammetry (measurement of current at a micro-electrode at a specified voltage) (ii) coulometry (measurement of current and time needed to complete an electrochemical reaction or to generate sufficient material to react completely with a specified reagent) (iii) potentiometry (measurement of the potential of an electrode in equilibrium with an ion to be determined) (iv) conductimetry (measurement of the electrical conductivity of a solution). 

Conductivity. Electrical conductivity measurements are appealingly simple and sensitive, and reflect the charge carrying ability (carrier population and mobility) of a test medium Interposed between two electrodes biased by DC or AC potentials. The key for chemical sensoring is to design some element of chemical selectivity Into the values of carrier population or mobility. Measurements in liquid ionic solutions (the classical method of conductimetry) have little intrinsic... 

Conductimetry. In this method the conductance of a solution is measured, using inert electrodes, alternating current, and an alternating null current. However, it is noteworthy that there is no electric current or potential gradient and the concentration of the analyte is measured as a function of the conductance of ions. 

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