First Day : Making stock solutions
- We prepared 100 ml 3 wt % bentonite solution; 97 ml water + 3 grams bentonite
- The original procedure for bead synthesis requires 50 ml ethyl actetate for 10 ml solution . we will use 100 ml ethyl actetate for 30 ml solution.
- The original procedure added glutaraldehyde (crosslinking agent) twice , we will add less glutaraldehyde but also in two steps (1.5 ml each )
The full, finalized procedure for the beads synthesis we will use throughout the semester can be found below:
- Make 100mL 3% bentonite solution.
- 97mL of water w/ 3g bentonite.
- Create a solution of PVOH, bentonite solution, water, and HCl.
- 1.25g PVOH, 5 mL bentonite solution, 15mL HCl, 35mL water
- Place this solution on a hot plate and heat at 70 degrees and stir at 240 until everything has dissolved (for 30 mins).
- Add 30 mL of this solution to a 100 mL solution of ethyl acetate in a dropwise manner stirring at 380 rpm.
- Add 1.5 mL of glutaraldehyde and stir at 260 rpm for 3 minutes.
- Add 1.5 mL of glutaraldehyde and stir at 260 rpm for 7 minutes.
- Same procedure as above with these amounts:
- 1.25g PVOH, 13 mL bentonite solution, 15mL HCl, 27mL water
We will prepare 10, 25 and 40 percent clay bead solutions, using PVOH as polymer.
The procedures can found below:
10 %
25 %
40 %
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