User:Moira M. Esson/Notebook/CHEM-581/2013/03/20

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  1. Finish rinsing and filtering prepared microspheres with hexanes.
  2. Continue microsphere preparation.
  3. Add dye to prepared microspheres in preparation for diffusion testing on microspheres with dye additive.

Microsphere Dye Addition

  • The general protocol for dye addition to PVA hydrogel/microspheres described on 2013/02/08 was followed.
  • An internal concentration of 1μM was wanted for the prepared microspheres and hydrogels
  • Dye was added to all the microspheres prepared on 2013/02/20

Dilution calculations:
1μM Rhodamine 6G Dye Concentration (90:10)

  M1V1 = M2V2
  1μM (RG6)x 10mL = (92μM)V2    V2 = 109μL

1μM Rhodamine 6G Dye Concentration (50:50)

  M1V1 = M2V2
  1μM (RG6)x 10mL = (165μM)V2    V2 = 61μL

Microsphere preparation

  • The general protocol for microsphere preparation described on 2013/02/20 and 2013/02/22.
  • The following preparations were run on a 0.1g scale as opposed to a 1g scale in the hopes of preventing the formation of hydrogels.
  • A very small amount of PVA/clay was added to each vial and the vial was filled with safflower oil prior to the rapid freezing in order to achieve a true emulsion of microspheres in the organic safflower oil. This may prevent the formation of hydrogels.

PVOH vs. Clay Ratio Clay Selection PVOH 146K Mass (g) Actual Clay Mass (g) H2O Added (mL) Safflower oil Added (mL)
50:50 110% CEC NaMT 0.05010 0.05100 20 35
90:10 110% CEC NaMT 0.01070 0.09100 20 35


  • Dye was added to the microspheres prepared on 2013/02/20 prior to a DSC analysis. These samples will need to be reprepared for DSC analysis.