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Ultrasound vibration potential imaging using silica dioxide colloids and ionic electrolytes

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  • UserJafar Iqbal Khan (University of Leeds)
  • ClockFriday 22 October 2010, 14:00-15:00
  • HousePhysics East 217.

If you have a question about this talk, please contact Vincent Boyer.

Ultrasound vibration potential is an electroacoustic or electrokinetic technique applied to colloidal particles in suspensions. An external ultrasonic wave applied to a source of nano particles forces the particles to undergo an oscillatory motion due to vibration. This motion results in generation of an alternating voltage as a response electrical signal by the suspended particles, which in turn is detected by a sensor. Electroacoustic techniques are a powerful tool to study colloidal particles, electrolytes and recently even bio-particles. The fact that ultrasound propagation through a body allows measurement of this potential gives prospects of tissue imaging with application in medical science.

This seminar address ultrasound vibration potential technique applied to ionic electrolytes and colloidal particles. A novel sensing technique has been established to image ultrasound vibration potential in terms of detecting the signal externally and fully outside the colloidal Silica dioxide source suspension. The study reveals effect of concentration, particle size and excitation frequency dependence on the detected colloid vibration potential (CVP) signal. Ionic electrolytes of category 1-1 have been introduced with great success to investigate the concentration, ionic mass and excitation frequency in relation to the ion vibration potential (IVP). For both IVP and CVP signal magnitude the observation is analogously for concentration effect, in addition it is seen that higher ionic mass enhances the magnitude of the IVP which is in good agreement with past studies but measuring different electroacoustic effects. In addition this seminar will cover basic principles UVP imaging and introducing the experimental facility.

This talk is part of the Cold Atoms series.

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