Silver nanoparticleswith spherical and pseudospherical shapes.The preparation started with a 0.01 M AgNO3 solution placed in a 100 ml reaction vessel. Under magnetic stirring, 5 ml of deionized water containing gallic acid (0.05 g for 9.3 nm sample) was added to
45 ml of silver nitrate solution. After the addition of gallic acid the
pH value of the solution was immediately adjusted to a pH of 11 with NaOH 3.0 M. All at room temperature.
when measuring the size of the sample with the DLS I obtain three peaks one at 1 nm, 10 nm and 100nm, but according to the protocol I should only obtain a peak at 10 nm, what I would be doing wrong or what parameter I could modify to obtain a single peak at 10 nm?
How much were the percentage of frequency or mass for each particles`s size range (1, 10 and 100 nm)? You know DLS has a lower resolution capacity. It is highly sensitive to large particles. The presence of a single large particulate matter in solution affects the reliability of DLS-based analysis. Besides optimization of your reaction conditions, it is also good to use methods, such, as size exclusion chromatography, with a higher resolution capacity.
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