V okviru seminarjev Laboratorija za biofiziko FE in doktorskega študija Nanoznanosti (v okviru UL) bo 26. septembra ob 11.00 v Diplomski sobi na Fakulteti za elektrotehniko predavanje:
General principles, effects, methods and medical applications of AC-electrokinetics
Whereas impedance methods detect the frequency dependence of the direct electric response of a suspension, electrokinetic methods investigate the frequency dependence of oriention, deformation, movement, aggregation or rotation of single objects, like cells. The effects can be observed microscopically. They arise from the interaction of the induced polarization of the objects with the inducing external field and can be exploited for dielectric particle characterization and for handling or manipulating microscopic and submicroscopic particles like cells, organelles, supramolecular structures, viruses or artificial colloids. Traditional AC-electrokinetic characterization methods had a limited frequency and conductivity range or required the microscopic observability of field-induced particle movements. New designs of measuring chambers, light scattering and dielectrophoretic field trapping methods solve these problems and access the GHz frequency as well as the submicroscopic particle ranges. First lab-on-chip systems exploiting the principles are available on the market. The higher resolution of the electrokinetic methods for the electric parameters of single objects allows for the detection of new polarization effects and time-dependent parameter changes at the single particle or cell levels. An introduction is given on the interrelations of the various AC-electrokinetic methods, new developments, cell-tech and medical applications.