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 PVOH Research
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OBJECTIVES
- Collect all DSC results from dry clay samples previously prepared on 2/08/13
- Run DSC sample analysis on dry clay samples previously prepared on 3/29/13
- Remove all excess oil from controlled microsphere samples prepared on 03/29/13
- Run fluorescence analysis on all microsphere samples prepared 02/20/13 with Rhodamine 6G dye
DSC Results for Dry Clay Samples
DSC Analysis: Mixed Microspheres
DSC preparation and protocol involving instrumentation and usage can be found on 9/17/12 entry.
| Sample Name
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Sample Mass (mg)
|
Pan / Lid Mass (mg)
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| 50:50 PVOH 130K NaMT |
3.12 |
50.01
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| 90:10 PVOH 130K 110% CEC NaMT w/ DMHXLBR |
2.29 |
50.17
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| 90:10 PVOH 130K Laponite |
2.59 |
50.12
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| 90:10 PVOH 130K 110% CEC Laponite w/ DMHXLBR |
2.27 |
50.28
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| 90:10 PVOH 146K 110% CEC NaMT w/ DMHXLBR |
2.65 |
50.11
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| 50:50 PVOH 146K 110% CEC NaMT w/ DMHXLBR |
2.50 |
50.17
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- Specific DSC parameters and protocols set to analyze dry clay samples included the following:
# Equilibrate sample at ~ -40°C
# Ramp sample temperature up from 20-240°C
# Ramp sample temperature down from 20-(-40°C)
# Repeat segment #2 again
Fluorescence Analysis: Diffusion Testing 2
RECALL DIFFUSION TESTING PROTOCOL ON 2/15/13
- Fluorescent samples run and completed for 2hr diffusion rate determinations:
# Microsphere 90:10 PVOH 146K 50% CEC NaMT w/ Bu3HdP+
# Microsphere 90:10 PVOH 146K 110% CEC Laponite w/ DMHXLBR
# Microsphere 90:10 PVOH 146K NaMT
# Microsphere 50:50 PVOH 146K NaMT
# Microsphere 50:50 PVOH 146K 50% CEC NaMT w/ Bu3HdP+
# Microsphere 50:50 PVOH 146K 110% CEC Laponite w/ DMHXLBR
- Specific parameters used to analyze fluorescence of hydrogel samples containing Rhodamine 6G dye included the following:
# Excitation: 480nm
# Emission Range: 500-650nm
# Excitation Slit Width: 10
# Emission Slit Width: 10
# Scan Speed: 1200
Fluorescence Results & Spectrums
Figure 1 - Microsphere 90:10 PVOH 146K 50% CEC NaMT w/ Bu3HdP+
***Fluorescence intensity maximum is 6.985
Figure 2 - Microsphere 90:10 PVOH 146K 110% CEC Laponite w/ DMHXLBR
***Fluorescence intensity maximum is 5.109
Figure 3 - Microsphere 90:10 PVOH 146K NaMT
***Fluorescence intensity maximum is 26.734
Figure 4 - Microsphere 50:50 PVOH 146K NaMT
***Fluorescence intensity maximum is 17.
Figure 5 - Microsphere 50:50 PVOH 146K 50% CEC NaMT w/ Bu3HdP+
***Fluorescence intensity maximum is 11.661
Figure 6 - Microsphere 50:50 PVOH 146K 110% CEC Laponite w/ DMHXLBR
***Fluorescence intensity maximum is 137.319
Notes
- For many of the DSC samples run, the microsphere samples analyzed were not completely dry; therefore, the DSC peak analysis will be highly affected by the presence of safflower oil encompassed in the sample
- X-ray diffraction will be run on all prepared microsphere samples in order to determine whether clay has agglomerated separately from the PVOH
- For hydrophilic polymers blended with clay, it was referenced that a peak shift below 10° was a strong indicator of excellent conglomeration
- The microsphere prepared with 50:50 PVOH 146K 110% CEC Laponite w/ DMHXLBR caused the most diffusion of dye
- All microspheres will be used for pressure testing, however, because not all dye leaked out
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