Thermal Effects and Temperature Profiles in Capillary Electrophoresis
Автор:Christopher Evenhuis Год: 2009 Издание:LAP Lambert Academic Publishing Страниц: 152 ISBN: 9783838334462 Measuring Temperature without Joule heating effects in CE: The introductory chapter gives a detailed description of thermal effects in capillary electrophoresis. The following experimental chapters describe simple methods to find the mean temperature of electrolyte inside the capillary, which do not involve any external equipment. The current and voltage data collected from the instrument is used to find the conductance, G at various applied voltages. By plotting a graph of G vs the power per unit length, P/L, a straight line is obtained which is extrapolated to P/L = 0 to find the conductance free of Joule heating G(0). The increase in temperature of the electrolyte is found from the change in G. Studies in fused silica- and polymer- capillaries are presented. A quick technique for fitting conductance versus voltage data to find the temperature increases is also described. Electroosmotic mobility may be used to find the temperature at the inner capillary wall. Techniques for...
