User:Klare Lazor/Notebook/Chem-496-001/2011/10/11

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BDLlogo notext lr.png Biomaterials Design Lab <html><img src="/images/9/94/Report.png" border="0" /></html> Main project page
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Test the conductivity of our nanoparticles that we created using probes


  • four leads close enough that with purple solution, that when we place on leads it will connect all four leads. on piece of teflon (white)
  • find the conductance of gold nanoparticles
  • start to investigate.
  • cut out pieces of platium wire
    • make them square or rectangular small as possible fit wire underneath comfortably
    • Wire has to make contact with these squares. wire 1" to .5"

steps(go in this order)

1. put down conductive epoxy on teflon (epoxy holds wire to teflon along with foil. wire connected to foil)

2. put down wire

3. put down square foil

note: need to known the area of each foil strip, should be as close as possible. between the two middle ones, close as possible. Use a caliber (mm)

Today set and let epoxy dry, get some protein and particles in small volume. Deposit all over the foil. Electrical contact. Foil can not be touching, but as close as possible. Becuase we do not know the strength of the conductivity between nanoparticles. Let them dry. Epoxy can only touch one of the leads at a time because it is conductive.


Why is a 4 point prober better than a 2 point probe?

  • 4-point probes method (Kelvin measurement) is a measuring technique that uses separate pairs of current-carrying and voltage-sensing electrodes to make more accurate measuremnts than the 2 point probe. 4 point probes was a solution to the disadvantages to a 2 point probe system. resistance measurement or I-V curve generation is more accurate.
  • Problems with 2 point probes can arise. The voltage is measured not only across the resistance in question, but also includes the resistance of the leads and contacts. this can cause problems when measuring a low resistance or when contact resistance may be high. accurate results may be difficult to obtain this way.
  • good link to explaination [1]

MSDS of Epoxy?


EYE: Can cause minor irritation, tearing and reddening. Can cause mechanical irritation if dusts are generated.

SKIN: Continued or prolonged contact may irritate the skin and cause a skin rash (dermatitis). May cause sensitization. Can cause light sensitivity that results in a skin rash when exposed to sunlight or ultraviolet light sources.

NHALATION: Can cause minor respiratory irritation Dust may be slightly irritating to the respiratory tract. Inhalation of dusts produced during cuffing, grinding or sanding of this product may cause irritation of the respiratory tract May cause allergic respiratory reaction. Overexposure to iron oxide dust/fume may cause siderosis. Overexposure to crystalline silica may cause silicosis.

INGESTION: Ingestion is not an anticipated route of exposure. Harmful if swallowed.


  • In summary, be extremely careful when dealing with epoxy


Area of each sheet in mm (from left to right on image above)

1) 4.1x6.9


3) 3.3x7.2


Each wire was roughly 1 inch long

used nanoparticles in water that was held constant at 80 degrees


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