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Dielectric Spectroscopy in a Variable Nanometer Gap

Prof. Alexander H. Slocum and Hongshen Ma. Dielectric Spectroscopy in a Variable Nanometer Gap. Develop an instrument to confine fluids in nanometer-thin films Study their properties using electrochemical impedance measurements. Hypothesis.

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Dielectric Spectroscopy in a Variable Nanometer Gap

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  1. Prof. Alexander H. Slocum and Hongshen Ma Dielectric Spectroscopy in a Variable Nanometer Gap • Develop an instrument to confine fluids in nanometer-thin films • Study their properties using electrochemical impedance measurements Hypothesis • Take advantage of nanoscale effects of fluids to create a new type of electrochemical sensor • Complementary instrument to NMR, DLS, UV-Vis, atomic absorption.

  2. Aggrecan monomer 50nm Applications • Studying the electrokinetic properties of large molecules • Prof. Al Grodzinsky: aggrecan • Hydrodynamic permeability • Rigidity of the aggrecan core • Low-cost blood osmolality meter • Battery and supercapacitor research • Low-cost drinking water monitor • Monitoring industrial chemicals (low conductivity fluids, e.g. oils and cryogenic fluids)

  3. Flat versus Spherical Electrodes • Difficult to maintain parallelism • Electrodes always tangent Si wafer, Ra = 1nm Tungsten carbide or Si-Nitride ball, Ra = 4nm, ~$6 each

  4. Disposable Fluid Cell Cartridge • Si-Nitride ball, 60nm Pt film *Patent Pending

  5. Flexure Mechanism *Patent Pending

  6. Results

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