Then the calculation that the quardratic came up with of about .4 nm for 400 nm was much closer than I thought!
Thanks for the additional data point for size vs wavelength for absorption. Marshall Frank Key wrote: > Marshall wrote: > > > Yes, and no. If it is clear it is either below 30 or above 144, but how > much below or above is not easy to determine since the data does not go that > far. > > > > I spent a little time with some curve fitting programs, but unfortunately > every curve fit I > > could find did not extrapolate at all. If I get a chance I will see if I > can determine the > > approximate particles size for absorption at 300 nm, which is the lower > limit of a > > normal person's vision. > > Color vs. particle size does not hold true for low the concentrations of > particles as found in most ionic CS. Many clear ionic products have > particles that measure in the 30 to 144 nm range but are low enough in > concentration that no color is discernable. > > The particles in Mesosilver measure 0.65 nm and it has peak absorption at > 400 nm. The particles in Mesogold measure the same but the absorption peak > is at 520 nm. > > frank key > > > > > Marshall > > > > Arnold Beland wrote: > > > > > Thank you, Marshall, for publishing this very valuable data. May we > infer from this that the particle size of our home made sol, if it is clear, > is less than 40nm ? The fact that we have particles would be borne out by > the presence of a strong beam of laser light from our laser pointer. > > > Best Regards, > > > Arnold Beland > > > www.atlasnova.com > > > ----- Original Message ----- > > > From: "Marshall Dudley" <[email protected]> > > > To: <[email protected]> > > > Sent: Monday, October 20, 2003 7:09 AM > > > Subject: CS>Color of silver sols > > > > > > > The following information is from "Light-Scattering Submircorsopic > particles as > > > > Highly Fluorescent Analogs and Their Use as Tracer labels in Clinical > and > > > > Biuological Applications" by Juan Yguerabide and Evangelina E. > Yguerabide, Depart > > > > of biology, University of California at San Diego, La Jolla, > California 92093. > > > > Analytical Biochemnistry 262, pages 157-176 (1998).. Articles number > AB982760. > > > > > > > > Silver Sols (colloidal silver): > > > > > > > > Diameter Transmission Scattered Light Absorb. wave max (nm) > Scattered > > > > wave max > > > > 38 Yellow Blue violet > > > > 431 465 > > > > 47 Yellow Blue > > > > 440 472 > > > > 60 Yellow Light Blue > > > > 449 474 > > > > 75 Gold Green Blue 465 > > > > 90 Pink Yellow > > > > 488 572 > > > > 118 Pink Yellow > > > > 527 575 > > > > 144 Brown Pale Yellow > > > > 575 590 > > > > > > > > This will be followed by 3 emails. > > > > > > > > 1. Silver spectral absortion for silver sols, unnormalized > > > > 2. Silver spectral absorption for silver sols, smaller particles > normalized. > > > > 3. Gold spectral absorption for gold sols, normalized. > > > > > > > > Marshall > > > > > > > > > > > > -- > > > > The silver-list is a moderated forum for discussion of colloidal > silver. > > > > > > > > Instructions for unsubscribing may be found at: http://silverlist.org > > > > > > > > To post, address your message to: [email protected] > > > > > > > > Silver-list archive: > http://escribe.com/health/thesilverlist/index.html > > > > > > > > List maintainer: Mike Devour <[email protected]> > > > > > > --- > > > Outgoing mail is certified Virus Free. > > > Checked by AVG anti-virus system (http://www.grisoft.com). > > > Version: 6.0.524 / Virus Database: 321 - Release Date: 10/8/2003 > >
