User:Patrick Hampson/Notebook/chem471/2016/10/25
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UV-VIS
Sample Preparation
Data
The graph above details the UV-VIS absorbance of our 0.75 mM fructose solution. Based on the absorbances, nanoparticles were only formed at pHs 4,5,11, and 12. The other solutions (not pH 4,5,11, or 12) formed a precipitate. pH 12 is the only solution that has distinct peak, as pH 4,5, and 11 are all "swooping", not detailing any peak, just absorbance. The peak for pH 12 is formed at a lower wavelength than what we witnessed with the formation of gold nanoparticles.
The graph above displays the absorbance experienced at wavelength 530. Only pHs 4,5,11, and 12 have absorbances at this wavelength. This is to be expected, as they were the only solutions to have significant absorbance. There appears to be a minor trend surrounding pH 8, which is acting as the peak for the trend. This trend is not so remarkable because there is practically no absorbance. Absorbance wise: 5>4>12>11
The graph above details the UV-VIS absorbance of our 1.25 mM fructose solution. Based on the absorbances, nanoparticles were only formed at pHs 4,11, and 12. The other solutions (not pH 4,11, or 12) formed a precipitate. pH 12 has the most distinct peak. pH 11 has a visible peak, but it is partially combined with a spike. pH 4 does not have a visible peak, as its absorbance has a "swooping" pattern. The peak for pH 11 is shifted to the right in comparison to the peak of pH 12.
The graph above displays the absorbance experienced at wavelength 530. Only pHs 4,11, and 12 have absorbances at this wavelength. This is to be expected, as they were the only solutions to have significant absorbance. There does not appear to be a trend surrounding pH 8. Absorbance wise: 11>12>4
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