User:Melissa Novy/Notebook/CHEM-581/2012/11/20

(Difference between revisions)

Revision as of 20:33, 24 November 2012

Protocol
1. Place film in 20 mL 10 mM Fe₂(SO₄)₃.
2. Time how long it takes for the film to change color from green to pink.
3. Remove film from salt solution, pat dry with KimWipes, and cut with a 3.5 mm film cutter.
4. Measure the thickness of the film with calipers, then place it in a quartz cuvette and take a spectrum from 200 nm to 800 nm.
5. Place the film back in its H₂SO₄ solution.
6. Discard the salt solution into a waste container.
7. Repeat the above steps in 20 mL solutions of Al₂(SO₄)₃ and Na₂SO₄.
The following films were analyzed with this protocol:
- PVOH(22K) 1.0067 g + 1 mL GA + 1 mL PP + HCl
- PVOH(22K) 1.0073 g + 1 mL GA + 1 mL PP
- PVOH(22K) 1.05225 g + 0.5 mL GA + 1 mL PP
Note that all films were stored in H₂SO₄ solution prior to being soaked in the salt solutions.
Immediately after being placed in the three salt solutions, the PVOH(22K) 1.05225 g + 0.5 mL GA + 1 mL PP films became colorless.

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-==Entry title==
+==Objectives==
-* Insert content here...
+* Run UV-vis on salt-exchanged PVOH(22K) + GA + PP films.
+==UV-Vis of Salt-Exchanged PVOH Films==
+* Protocol
+*# Place film in 20 mL 10 mM Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>.
+*# Time how long it takes for the film to change color from green to pink.
+*# Remove film from salt solution, pat dry with KimWipes, and cut with a 3.5 mm film cutter.
+*# Measure the thickness of the film with calipers, then place it in a quartz cuvette and take a spectrum from 200 nm to 800 nm.
+*# Place the film back in its H<sub>2</sub>SO<sub>4</sub> solution.
+*# Discard the salt solution into a waste container.
+*# Repeat the above steps in 20 mL solutions of Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> and Na<sub>2</sub>SO<sub>4</sub>.
+* The following films were analyzed with this protocol:
+** PVOH(22K) 1.0067 g + 1 mL GA + 1 mL PP + HCl
+** PVOH(22K) 1.0073 g + 1 mL GA + 1 mL PP
+** PVOH(22K) 1.05225 g + 0.5 mL GA + 1 mL PP
+* Note that all films were stored in H<sub>2</sub>SO<sub>4</sub> solution prior to being soaked in the salt solutions.
+* Immediately after being placed in the three salt solutions, the PVOH(22K) 1.05225 g + 0.5 mL GA + 1 mL PP films became colorless.