User:Mary Mendoza/Notebook/CHEM 581: Experimental Chemistry I/2014/10/31: Difference between revisions

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* ''I concluded that the dilemma in the formation of beads is the immiscibility of the organic phase which forms the beads and the aqueous phase that cross-links the beads.''
* ''I concluded that the dilemma in the formation of beads is the immiscibility of the organic phase which forms the beads and the aqueous phase that cross-links the beads.''
* ''Therefore, I thought I can resolve this issue by choosing several organic solvents slightly miscible with water but hydrophobic enough to form the beads.''
* ''Therefore, I thought I can resolve this issue by choosing several organic solvents slightly miscible with water but hydrophobic enough to form the beads.''
* ''In an attempt to keep the reaction mixture homogenized, I


<u>Acetonitrile Trial</u>
<u>Acetonitrile Trial</u>

Revision as of 21:52, 10 December 2014

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Continuation of Bead Synthesis Trials

  • The burette set-up utilized by Eleni, Melvin, and Becca's group will be used; details of their assembly can be found on Kalivas' entry for 10/29/2014.
  • The assembly was prepared as shown in the picture.

Description

  1. A column was set up with glutaraldehyde and hexane. Air is being bubbled through the column to mix the two liquids.
  2. PVA-Clay will be dropped down the column

Hexane Trial

  • The PVA-Clay formed beads within the hexane and floated down the column. They did not cross-link fast enough if at all and they dissolved into the glutaraldehyde.

Organic-Glutaraldehyde Solution

  • We attempted to add acetone to glutaraldehyde and then add hexane to get rid of the solvent layers. The solution was not hydrophobic enough to form beads however. When only a slight layer of hexane and stirring were applied, it yielded no good results.
  1. We have decided to abandon the beads and begin synthesis of ribbons
    1. We filled a column with acetone and 1.5mL of Glutaraldehyde
    2. we then dropped in the PVA-Clay

Trial of Several Organic Solvents

  • I observed that as soon as the organic phase, formed bead comes into contact with the aqueous phase of the glutaraldehyde, the bead disperses into the aqueous solution. I decided to conduct my own trials and have my group members continue the burette-ribbon experiments.
  • I concluded that the dilemma in the formation of beads is the immiscibility of the organic phase which forms the beads and the aqueous phase that cross-links the beads.
  • Therefore, I thought I can resolve this issue by choosing several organic solvents slightly miscible with water but hydrophobic enough to form the beads.
  • In an attempt to keep the reaction mixture homogenized, I

Acetonitrile Trial

  • We needed a solvent that would still form beads with the PVA-Clay while being miscible in water. The PVA-Clay however was not forming beads within the solute but rather clumps.



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