User:Tamanika Tinsley/Notebook/Chem 581 Biomaterials Design Lab/2014/09/17

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Sept 17 -Set up for X-Ray and Separation of ionic liquid modified clays

  • Group Members Andrew Farag Sr (Undergrad) and Michael Bible Jr (Undergrad)
  • Group Name : AMT

Objective

  • Measure new MG experiments through UV-Vis
  • Finish film processing
  • Centrifuge exchange clay
  • Set up PXRD of PVA+Clay films

Description

The exchanged clay was centrifuge for 30 minutes at 4,000 rpm at 4C. The supernatant was collected and stored for future analysis. The remaining clay was washed with water and re-centrifuged for 10 minutes at 4,000 rpm at 4C. The wash process was repeated but with ethanol for the second wash. Two more washes one of water and one of ethanol was repeated by Dr. Hartings. He also air dried the remaining clay on a watch glass overnight. During the centrifuging process it was noticed that the clay separated into two layers (See Figure 1.) It is unclear why this occurred however it is thought the clay might not have been homogenous and therefore parts of it were more homophobic then others.

  • The set up PXRD of PVA+Clay films at different concentrations were as follows
  1. 1-Clay powder-control
  2. 2-8ppm by Madeleleine
  3. 3-2ppm by
  4. 4-PVA film-control
  5. 5-80ppm by Eleni
  6. 6-200ppm by my group
  • The analysis was complete with the following instrument settings
  1. 2o start angle
  2. 40o stop angle
  3. 1o/second scan speed (this seems too fast, will check on this)
  4. 0.5o sampling width

(Description from Dr. Hartings lab notebook Dr. Hartings)

Calculations

  • Dilutions of MG solutions
    • 200ppm*0.2mL=8ppm*5mL(vial with PVA film)
    • 80ppm*0.5mL=8ppm*5mL(vial with no film)
    • 80ppm*0.2mL=8ppm*2mL(vial with PVA film)

Figures

Figure 1. Shows the separation of the clay after the first washing of water. Washing1.png

Figure 2. Shows the dried clay being collected for future testing. Dry.png

Results

Uvavis.png ICE table PVA+control.png