User:Moira M. Esson/Notebook/CHEM-581/2013/02/01

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Objectives Remake hydrogels prepared on 2013/01/30 with dye added to the reaction mixture. Finish preparation of hydrogels with PVOH MW 146,000-186,000. Prepare exchanged clays. Hydrogel preparation The following hydrogels were prepared following the general protocol described on 2013/01/30. However, the necessary amount of dye was added to each sample prior to freezing using the prepared DMSO/dye stock solution. Prepared Clay-PVA(MW 130,000) hydrogels ' ' ' ' Composition of hydrogel(ratio of PVA to clay) Amount of PVA added(g) Amount of clay added(g) Concencentration of DMSO/dye stock solution added(μM) Amount of DMSO/dye added(mL) 90:10 PVA:50% Bu3HdP-NaMT 0.92966 0.0999 92 0.0655 50:50 PVA:Bu3HdP-NaMT 0.5061 0.5001 165 0.0364 90:10 PVA:Lamponite 0.9161 0.1004 92 0.0655 50:50 PVA:Lamponite 0.499 0.5009 165 0.0364 90:10 PVA:NaMT 0.8991 0.1002 92 0.0655 50:50 PVA:NaMT 0.5007 0.4996 165 0.0364 90:10 PVA:110% Lamponite 0.9008 0.0999 92 0.0655 50:50 PVA:110% Lamponite 0.4998 165 0.0364 90:10 PVA:110% NaMT 0.8997 0.1005 92 0.0655 Observations In order to have a complete and even spread of dye, a glass stirring rod was used to mix the hydrogels. Before addition of DMSO/dye, the hydrogels were allowed to cool slightly. Hydrogels with NaMT added did not have as even of a distribution of dye. Upon addition, the dye seemed to sit on top of the hydrogel. Extra stirring was required for these hydrogels. Clay Preparation Surfactant clay exchanges were performed to create a 50% exchanged clay between NaMT and Bu3HdP and 110% exchange between NaMT and Lamponite. The general protocol for the preparation of 50% exchanged NaMT described on 2012/09/12 was followed. For the preparation of 110% exchanged NaMT and 110% exchanged Lamponite please refer to Karlena Brown's lab notebook.