User:Samiye Yaman/Notebook/Lab 581/2013/02/08

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'''Part A: pH study'''
'''Part A: pH study'''
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*HCl solutions with different pH were prepared( pH 1.5, 2.5 & 3.5) in order to mimic the pH of stomach. Each hydrogels were left in the solution until wednesday.
+
''*HCl solutions with different pH were prepared( pH 1.5, 2.5 & 3.5) in order to mimic the pH of stomach. Each hydrogels were left in the solution until wednesday.''
*30 ml of water added to the beaker. 0.18 g of PVOH with R6G(MW:146,00)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 1.5. (final pH=1.3)
*30 ml of water added to the beaker. 0.18 g of PVOH with R6G(MW:146,00)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 1.5. (final pH=1.3)
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*Masses of hydrogels before placing in to the water.
*Masses of hydrogels before placing in to the water.
1)PVOH (MW:146,000) with R6G (prepared on 30/01/2013)=0.22g
1)PVOH (MW:146,000) with R6G (prepared on 30/01/2013)=0.22g
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2)PVOH (MW:130,000) with R6G (prepared on 30/01/2013)=0.66g
2)PVOH (MW:130,000) with R6G (prepared on 30/01/2013)=0.66g
 +
3)PVOH (MW:89,000-98,000) with (prepared on 30/01/2013)=0.55g
3)PVOH (MW:89,000-98,000) with (prepared on 30/01/2013)=0.55g
==Data==
==Data==
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Observation 1: PVOH with 22,000 molecular mass was still liquid after 3 cycles therefore it can be concluded that it might not be a good candidate for this research.  
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Observation 1: PVOH with 22,000 molecular mass was still liquid after 3 cycles therefore it can be concluded that it might not be a good candidate for this research.
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Observation 2: Photos of hydrogels 
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MW= 22,000g/mol(it was still liquid.)
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[[Image:2013-02-08 12.18.19.jpg|center|400px|]]
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MW=89,000 g/mol (most homogeneous hydrogel)
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[[Image:2013-02-08 12.19.11.jpg|center|400px|]]
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MW=130,000 g/mol (It was not homogenous. undissolved solids were visible in the hydrogel)
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[[Image:2013-02-08 12.21.31.jpg|center|400px|]]
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MW=146,000 g/mol (it was not homogenous. visible undissolved solids were present)
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[[Image:2013-02-08_12.25.11.jpg|center|400px|]]
==Notes==
==Notes==
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*Nanohydrogels are still going through their second cycle. Third cycle will end on 09/02/2013.

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Contents

Objective

Description

Part A: pH study

*HCl solutions with different pH were prepared( pH 1.5, 2.5 & 3.5) in order to mimic the pH of stomach. Each hydrogels were left in the solution until wednesday.

  • 30 ml of water added to the beaker. 0.18 g of PVOH with R6G(MW:146,00)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 1.5. (final pH=1.3)
  • 30 ml of water added to the beaker. 0.16 g of PVOH with R6G(MW:146,00)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 2.5. (final pH= 2.29)
  • 30 ml of water added to the beaker. 0.18 g of PVOH with R6G(MW:146,00)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 3.5. (final pH=3.3)
  • 30 ml of water added to the beaker. 0.54 g of PVOH with R6G(MW:130,00)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 1.5.
  • 30 ml of water added to the beaker. 0.56 g of PVOH with R6G(MW:130,00)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 2.5.
  • 30 ml of water added to the beaker. 0.43 g of PVOH with R6G(MW:130,00)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 3.5.
  • 30 ml of water added to the beaker. 0.58 g of PVOH with R6G(MW:89,000-98,000)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 1.5.
  • 30 ml of water added to the beaker. 0.59 g of PVOH with R6G (MW:89,000-98,000)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 2.5.
  • 30 ml of water added to the beaker. 0.60 g of PVOH with R6G (MW:89,000-98,000)(prepared on 30/01/2013) placed in to the beaker. Drops of 1M of HCl were added to the beaker until pH was close to 3.5.


Part B: swelling study

  • Measure the mass of each hydrogel.
  • Place the hydrogel in to a beaker with 20 ml of water.
  • Masses of hydrogels before placing in to the water.

1)PVOH (MW:146,000) with R6G (prepared on 30/01/2013)=0.22g

2)PVOH (MW:130,000) with R6G (prepared on 30/01/2013)=0.66g

3)PVOH (MW:89,000-98,000) with (prepared on 30/01/2013)=0.55g

Data

Observation 1: PVOH with 22,000 molecular mass was still liquid after 3 cycles therefore it can be concluded that it might not be a good candidate for this research.


Observation 2: Photos of hydrogels

MW= 22,000g/mol(it was still liquid.)

MW=89,000 g/mol (most homogeneous hydrogel)

MW=130,000 g/mol (It was not homogenous. undissolved solids were visible in the hydrogel)

MW=146,000 g/mol (it was not homogenous. visible undissolved solids were present)

Notes

  • Nanohydrogels are still going through their second cycle. Third cycle will end on 09/02/2013.
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