User:Karlena L. Brown/Notebook/PVOH Research/2013/02/04: Difference between revisions

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==PVOH Film Preparations==
==OBJECTIVES==
'''Prepared PVOH films in water:'''
* In 10mL beaker, weigh out ~ 0.5 grams PVOH (MW 130,000)
'''(Actual Mass = 0.4934g)'''
* Then, using a graduated cylinder add ~ 3 mL H<sub>2</sub>O to the beaker
* In another 10mL beaker, weigh out ~ 1.0 gram PVOH (MW 130,000)
'''(Actual Mass = 0.9965g)'''
* Then, using a graduated cylinder add ~ 5 mL H<sub>2</sub>O to the beaker


'''Standard PVOH Film Protocol:'''
==Clay Exchanged Solutions & Vacuum Filtration Procedures==
* After adding and combining PVOH (MW 130,000) in small beakers with H<sub>2</sub>O, add stir bars and prepare to stir solution.
'''The clays being filtered are the clays that were prepared on 2/1/13'''
* On hot plate, stir and heat both beaker solutions at 70-80°C for ~ 12 min or until PVOH dissolves.
* Once PVOH solids thoroughly dissolve in solution, pour each solution in a Teflon dish to sit, cool, and dry in a fume hood for ~ 1 day.


'''Notes:'''
'''Setup of a vacuum filtration system:'''
* An additional 2-3 mL H<sub>2</sub>O was added to each solution to aid the dissolving of the PVOH
  * Clean 250mL Erlenmeyer Filter Flask
* Heat was reduced when solutions began to boil too rapidly
  * Large Buchner Funnel
* While transferring solutions to Teflon dishes, loss of sample within the small beakers (sample loss = incomplete sample transfer)
  * Whatman #42 Filter Paper
  * Long Secure Rubber Hose
 
# Filter a clay solution selected using the vacuum filtration system setup
# Attach all parts of the apparatus to the vacuum filtrator system
# Place a piece of Whatman #42 filter paper in the Buchner Funnel
# Turn on the vacuum filtrator system
# Check the suction rate to ensure that enough pressure is applied
# Pour an exchanged clay solution into the Buchner funnel
# Allow vacuum filtration to continue until the clay is completely dry
# Discard the aqueous filtrate solution and place it in a labeled waste container
# Collect the soil filtrate on the filter paper and scrape it into a small labeled metal pan
# Place metal pan with the soil filtrate in the oven to dry for ~ 2-3 days
# Wash all glassware and equipment first with H<sub>2</sub>O and then with acetone for later use
 
==Notes==
* Clays previously prepared on 2/1/13 only exchanged for ~ 5 days rather than a week.
* While attempting to filter the clays, due to vacuum filtration moving rather slowly during separation, clays only were filter for ~ 2.5 hours before actually being placed in the oven.
* The temperature of the oven when the clays were placed in was ~ 90°C.




Revision as of 14:41, 10 February 2013

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OBJECTIVES

Clay Exchanged Solutions & Vacuum Filtration Procedures

The clays being filtered are the clays that were prepared on 2/1/13

Setup of a vacuum filtration system: 

  * Clean 250mL Erlenmeyer Filter Flask
  * Large Buchner Funnel
  * Whatman #42 Filter Paper
  * Long Secure Rubber Hose
  1. Filter a clay solution selected using the vacuum filtration system setup
  2. Attach all parts of the apparatus to the vacuum filtrator system
  3. Place a piece of Whatman #42 filter paper in the Buchner Funnel
  4. Turn on the vacuum filtrator system
  5. Check the suction rate to ensure that enough pressure is applied
  6. Pour an exchanged clay solution into the Buchner funnel
  7. Allow vacuum filtration to continue until the clay is completely dry
  8. Discard the aqueous filtrate solution and place it in a labeled waste container
  9. Collect the soil filtrate on the filter paper and scrape it into a small labeled metal pan
  10. Place metal pan with the soil filtrate in the oven to dry for ~ 2-3 days
  11. Wash all glassware and equipment first with H2O and then with acetone for later use

Notes

  • Clays previously prepared on 2/1/13 only exchanged for ~ 5 days rather than a week.
  • While attempting to filter the clays, due to vacuum filtration moving rather slowly during separation, clays only were filter for ~ 2.5 hours before actually being placed in the oven.
  • The temperature of the oven when the clays were placed in was ~ 90°C.



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