•Prepare gold and silver
nanoparticles
•What do you observe with your eye? (simple visual inspection, color, turbidity,
etc.).
•Tyndall beam.
Do you see a scattering path from the light? What color is it?
Is the color of the scattered light changed by the sol
before it gets to you?
•Spectrophotometer.
Extinction Spectra.
Is the extinction dominated by absorption or
scattering? How can you tell?
•Model using MiePlot to determine particle size
Make initial guess and then refine your guess.
How sensitive is the spectrum to particle size?
•Optical microscope
bright field
dark field
•Electron Microscope
What is the wavelength of the electrons we used?