User:Melissa Novy/Notebook/CHEM-572/2013/02/20

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* Remove PLA films, made on [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/19|2013/02/19]], from glass molds.
* Remove PLA films, made on [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/19|2013/02/19]], from glass molds.
* Soak [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/19|PLA films]] in pure H<sub>2</sub>O to test for Ag<sup>+</sup> leaching with a silver ion selective electrode.
* Soak [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/19|PLA films]] in pure H<sub>2</sub>O to test for Ag<sup>+</sup> leaching with a silver ion selective electrode.
 +
* Run X-ray on [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/12|100Ag-LMT]].
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==X-Ray Diffraction on 100Ag-LMT==
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* The protocol from [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/05|2013/02/05]] was used.
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* The data obtained from XRD will be posted on [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/26|2013/02/26]].
==Calculations==
==Calculations==

Revision as of 15:36, 20 February 2013

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Objectives

  • Calculate the amount of AgNO3 to add to LB media solutions for desired final [Ag+].
  • Remove PLA films, made on 2013/02/19, from glass molds.
  • Soak PLA films in pure H2O to test for Ag+ leaching with a silver ion selective electrode.
  • Run X-ray on 100Ag-LMT.

X-Ray Diffraction on 100Ag-LMT

Calculations

  • Two sample calculations are given as examples. The final [Ag+] in 50-mL solutions of LB media was calculated as follows:
  1 μM Ag+ in 50 mL of LB media
  (0.0105 M Ag+) × V1 = (1×10-6 M) × (50 mL)
  V1 = 0.00476 mL of 0.0105 M AgNO3
  10 μM Ag+ in 50 mL of LB media
  (0.1 M Ag+) × V1 = (10×10-6 M) × (50 mL)
  V1 = 0.005 mL of 0.1 M AgNO3
  • AgNO3 solutions made on 2013/02/05 and 2013/02/13 will be added to the LB media solutions in the following amounts:
Final [Ag+] Volume of AgNO3 Solution Added
1 μM4.76 μL of 0.0105 M
10 μM5.00 μL of 0.1 M
100 μM50.0 μL of 0.1 M
1 mM500 μL of 0.1 M
10 mM5000 μL of 0.1 M
  • Note that for each volume of AgNO3 added to the LB media, the same volume of LB media will first be removed from the flask to maintain the final concentration of Ag+.

ISE Study of PLA2002D + 5 wt% 100Ag-LMT

  • Calculations
    • To determine maximum [Ag+] possible, assume that all Ag+ leaches out of solution.
    • The solution contained 50 mL pure H2O and 1 mL ionic strength adjuster. The recommended ratio of solution to ionic strength adjuster is 50 mL to 1 mL. Then, 0.50 g of film was added to the solution.
  (4.47 × 10-8mol Ag+0 ÷ 0.051 L = 8.76 × 10-7 M or 0.876 μM


  • Protocol
    1. Pour 50 mL pure H2O into a clean, dry 250-mL Erlenmeyer flask and add 1 mL of 5 M KNO3.
    2. Measure the conductivity of the solution with the ISE.
    3. Place a single 0.5 g piece of film into the flask, swirl, and measure the conductivity.
    4. Wait 30 min, then measure the conductivity again.
    5. Repeat the above step 5 more times.



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