You might be able to find one. Problem is the calibration. The instrument will give you the absorption spectrum down to about 190 nm WAVELENGTH, and you have to figure out what that responds to in nm of particle size.
Marshall James Osbourne, Holmes wrote: > Hi Marshall, and all, > > Do you know if the scanning photospectrometer will read down to about 1 > nm? Is there a used market for the things, and about how much do they > cost? This sounds like a possible low-cost alternative to electron > microscopy for verifying production particle size. > > Thanks, > James Osbourne, Holmes > > [email protected] > > -----Original Message----- > From: Marshall Dudley [SMTP:[email protected]] > Sent: Tuesday, July 06, 1999 12:45 PM > To: [email protected] > Subject: Re: CS> Boiling water > > Reid Smith wrote: > > > >Charles Marcus wrote: > > >Until someone gives (a) specific reason(s) for it being > > >Hot means higher energy. Higher energy means more Browning movement. > More > > >Browning movement means higher likelyhood of overcoming the mutual > repulsion > > >of the charge between particles. When particles bang together the > aggregate, > > >thus producing bigger particles. > > >This would likely produce a gold colored colloid instead of a clear > colloid, > > >which would confirm that the particles are larger. Smaller is better. > > >Marshall > > > > Where did you get the idea that a gold colored CS is a sign of > > larger particals? I find that VERY hard to believe. The reason I say > > that is I made CS for some time and never once got a gold color until > > I changed the type of distilled water that I was using. EVERY thing > > was exactly the same except the water. > > It is not an idea, it is a well known fact. Check any textbook on > colloidal > chemistry. I have given this information several times before on this > list. > This is documented in many scientific journals and papers. AT > http://silver-lightning.com/research2.html we have the following paragraph: > > The absorption band of silver colloids > increases in > wavelength as the size of the particles > increase. This allows a qualitative > measurement on > the particle sizes in a colloid by use of > a scanning photospectrometer. Ionic silver has > an > absorption band in the UV range and > thus is virtually clear. As more atoms > aggregate > into a particle, the absorption band > moves from the UV into the violet, blue, > green, > yellow, orange and red. Since, the color of > a substance is the complement of the color > absorbed > colloidal silver will go from clear to > very light yellow, gold, orange, red, blue and > green. (Collloidal Chemistry p 65). Colloids that contain a > broad range of sizes can absorb wavelengths > across > the spectrum resulting in brown and > black. It is generally accepted that only > clear to > light gold silver colloids have particle > sizes small enough to be effective, and to be > able > to reach the blood stream. > > This is a known fact, not a theory. I can give you references to at least > a > dozen other papers that verify this, if I want to go dig them out. > > As far as changing the water, this is VERY believable. Water with more > dissolved salts in it produces bigger particles, and thus will give a gold > color. > > Marshall > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > To join or quit silver-list or silver-digest send an e-mail message to: > [email protected] -or- [email protected] > with the word subscribe or unsubscribe in the SUBJECT line. > > To post, address your message to: [email protected] > > List maintainer: Mike Devour <[email protected]> > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > To join or quit silver-list or silver-digest send an e-mail message to: > [email protected] -or- [email protected] > with the word subscribe or unsubscribe in the SUBJECT line. > > To post, address your message to: [email protected] > > List maintainer: Mike Devour <[email protected]> -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] List maintainer: Mike Devour <[email protected]>
