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Use Sauerbrey equation explain Δf Vs. analyte concentration

  1. May 4, 2015 #1
    1. Explain, using the Sauerbrey equation, how the change in the resonance frequency of a quartz crystal can be related to an analyte concentration


    2. Sauerbrey equation: upload_2015-5-5_1-38-32.png


    3. I knew Quartz crystal microbalance work according to the change of frequency after mass loaded, and when working in a Newtonian liquid the corresponding frequency shift is upload_2015-5-5_1-42-29.png (Kanazawa and Gordon, 1985), whichηL is the liquid viscosity; andμ is the shear modulus.
    But I cannot understand the relation between the change of frequency and the analyte concentration according to the Sauerbrey equation.

    thank you for helping
     
  2. jcsd
  3. May 5, 2015 #2

    Borek

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    Staff: Mentor

    And not through the adsorption isotherm?
     
  4. May 5, 2015 #3
    Thank you for replying. It could be relate to the surface adsorption, but must explain according to the Sauerbrey equation.
     
  5. May 5, 2015 #4

    Borek

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    Staff: Mentor

    I haven't said "don't use Sauerbrey equation". I said "combine it with an isotherm".
     
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