Re: Physics of Settling?

jmfbahciv@xxxxxxx wrote:
<snip>
Thank you :-). [emoticon checks off another mystery of life]

Stupid question: Would round balls, where stiffness isn't part
of the dynamic, behave differently if they were different colors?
Would stiffness not be part of the dynamic?

Sort of, but only when the particles approach the wavelength of light, a micron or so. That's the basis for 'photonic bandgap materials' in that there are certain directions that light can no longer propagate, in analogy to electronic bandgaps.

If you then dope the material with fluorescent particles, you can affect the excitation lifetime. If the material is made from for example, a liquid crystal emulsion with the liquid crystal drops in a nematic, smectic, or cholesteric phase, then other things can happen. It's easier to think of materials to make than to predict what the macroscopic properties will be. Ellipsoidal particles, binary alloys, rods, discs, dielectric particles, conducting particles, etc. etc. Even the most basic properties, for example the equilibrium crystal structure, is extremely difficult to calculate.

--
Andrew Resnick, Ph.D.
Department of Physiology and Biophysics
Case Western Reserve University
.

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