User:Andrew K Farag/Notebook/CHEM-581/2014/09/12

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Start preparing new films using exfoliated clay. Perform XRD measurement. Continue analysis of DSC and UVVis.


  1. Exfoliated Clays
    1. An exfoliated clay has had all of its layers separated from one another. Instead of having layers in water, you have single sheets of material. This should change the absorption properties of the clay. We are going to test PVA-exfoliated clay materials against the regular PVA-clay material.
    2. To exfoliate clay, you stir it in water for 24 hours. (Luckily Dr. Fox has done this for us already).
    3. Stock solution 4% sodium montmorillonite
      1. Determine how to make a film such that you make a 10% clay (1g of PVA, ?? of exfoliated clay solution).
    4. Prepare a crosslinked film with the exfoliated clay in a similar manner to your other films
  2. Continue DSC analysis
  3. Continue UVVis Analysis
    1. set up new malachite green/PVA-film experiment.
    2. my group set up the 8ppm malachite green (4mL of 200 ppm MG +96mL of water)
    3. two vials with no film were prepared as well to compare the glass absorbance.



A 10% clay has 1g of PVA and should have .11g of exfoliated clay.

.11g of clay = (4% solution)x = (0.04)x

x = 2.75g of exfoliated clay solution

Actual mass of solution used was 2.5387g. Figure 1. Shows the calculations for the mass of water in the films.
Water masses.png

DSC Results

Pva with clay dsc.png
2ppm clay dsc.png
8ppm clay dsc.png
80ppm clay dsc.png
200ppm clay dsc.png