User:Helen L. Slucher/Notebook/CHEM-572/2014/02/04

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Objective To synthesize citrate-coated GNPs 40-45nm in size To synthesize polydopamine-coated GNPs Citrate Coated GNPs Prepare stock solutions Dissolve HAuCl4 in water to have a solution of 10mM Dissolve 250mg of the citrate sodium salt into 25mL of water In a beaker mix 50mL of water and a volume of the gold stock solution corresponding to 1.214*10^-2 moles of Gold Bring solution to a boil Add a 0.5mL of the citrate sodium solution and reflux for 30 minutes Note color change from dark blue to red Data We made three separate citrate-GNP solutions at the same time One of the solutions changed color to blue first, however, it also did not turn red (deep purple) The other two solutions changed color to blue and then red Solution 1: 20-25nm Solution 2: 14-16nm Solution 3 (deep purple): 4-5nm We made two more citrate-GNP solutions and this time we used a stir bar The solutions changed color to blue and then red Solution 4: 35nm Solution 5: 25nm