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SUMMARY:Resonance and Wave Propagation in Microfluidic Devices
DTSTART:20111101T140000
DTSTAMP:20260408T015458Z
UID:60090959713d13d649f901f81657a08457ee187c6361336cdd664941
CATEGORIES:Conferences - Seminars
DESCRIPTION:Marcel Utz\, University of Virginia\, USA\nMicrofluidic lab-on
 -a-chip devices represent a rapidly evolving technology  with the potentia
 l to put complex biochemical assays directly into the hands of forensic of
 ficers and medical care providers. Current systems  however  require a lar
 ge amount of supporting hardware to control fluid transport. This severely
  limits the wide deployment of microfluidic technology. We have recently s
 hown that is possible to replace the pneumatically activated valves which 
 are commonly used in microfluidics with passive  compliant structures on t
 he chip. These behave like fluidic analogues of passive electronic circuit
  elements  such as capacitors  resistors  and diodes. In the right combina
 tion  these elements make the fluidic network frequency-specific  allowing
  to control the motion of fluids by modulating the frequency of a single p
 ressure input. In extension of this idea  channels in microfluidic network
 s can exhibit distributed capacitance and inductance. It will be shown tha
 t this leads to behavior analogous to that of electromagnetic waveguides. 
 Pressure waves in the fluid couple to bending waves in the layer covering 
 the channels. We have derived the dispersion relation for such fluidic wav
 es  and predict that it is possible to design filters based on standing wa
 ve modes with very high frequency selectivity. Preliminary experimental ev
 idence to support this hypothesis will be discussed
LOCATION:CM 1 106
STATUS:CONFIRMED
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