OBJECTIVES
ACCIDENTALLY PLACED THIS ENTRY ON THE FEBRUARY 4th; HOWEVER, THIS ENTRY SHOULD BE UNDER FEBRUARY 6th. THANK YOU.
- Begin preparing polyvinyl alcohol microsperes for experimental analysis
- Filter surfactant exchanged modified clays
- Complete freeze and thaw crosslinked clay cycle #1
90:10 PVOH Clay Microsphere Preparations
- In 10mL beaker, weigh out ~ 0.9 grams PVOH (MW 146K)
- Then, using a graduated cylinder add ~ 6 mL H2O to the beaker
- After adding and combining PVOH (MW 146K) in a small beaker with H2O, add a stir bar to stir solution
- On hot plate, stir and heat beaker solutions at 70-80°C for ~ 1 hour or until PVOH dissolves
- Once PVOH solids thoroughly dissolve in solution, then add ~ 0.1 gram of clay to the solution
- Continue stirring the solution until a homogenous mixture forms and the clay is equally distributed
- Allow the solution to cool to 40-50°C, and then remove the stir bar from the solution
- Then place the solution into the freezer at -20°C to freeze for ~ 24 hours
- The next day, remove the hydrogels in the freezer in order that the substances can thaw for ~ 24 hours
- Continue the crosslinking freezing and thawing method for ~ 3 days
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
- 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 H2O and then with acetone for later use
Notes
ACCIDENTALLY PLACED THIS ENTRY ON THE FEBRUARY 4th; HOWEVER, THIS ENTRY SHOULD BE UNDER FEBRUARY 6th. THANK YOU.
- 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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PVOH Research
