Frank, ref your "A rather misinformed comment, wouldn't you say, given the fact that there is a size distribution plot that clearly shows a huge volume peak at 2.4 nm that is available for all to see"..... why not send me a sample of that specially prepared sample and we'll make available and/or publish micrographs of it ....for all to see! Stephen
> -----Original Message----- > From: Frank Key [mailto:[email protected]] > Sent: Friday, March 30, 2001 1:46 PM > To: [email protected] > Subject: Re: CS>Commercial Product Reports > > > Stephen wrote: > > > > > If there are 2 nm particles in the colloid, the Zetasizer has > no problem > > > finding them. > > > > The scales don't even start [on the products you chose] below > 3.7nm -- and > > there is "0" data smaller than 27nm shown! > > That is what is called "auto scaling", modern scientific > instruments do that sort of thing. If there is no data, then > nothing is reported. > > Please notice on the Smalltest sample, the auto scaling choose a > minimum value to report of 1.3 nm. > > > My comments were directed to the reports you had previously published on > > your website, not something just concocted to rebut an argument! > > Auto scaling works the same on all the runs, it is a standard > feature that is always enabled. > > > > Then, what do you suppose happened to the particles that were > visible, if > > only faintly, in the Tyndall prior to evaporation? > > Since the particles of silver oxide outnumber the "real > particles" by several million to one, they simply make > observation of the "real particles" very difficult, if not impossible. > > > The Zetasizer was designed for particle sizing in "bulk analysis", NOT > > particle characterization -- as I was informed. > > Bulk analysis means the aggregate solution, which is precisely > what is desired for particle size distribution. Size distribution > is but one parameter of complete characterization of colloidal > particles, and a very important parameter. Zeta potential is > another very important parameter in characterizing colloids. > > > No, Frank, not evaluation; just raw data. No Qualitative > analysis whatever! > > And no pH data.... > > Sorry about that, the pH data will be forthcoming shortly, I > wanted to get a new pH probe operational and doing so has not > been the highest priority. > > The pH data does not change any of the data presented and makes > no material change to the picture that can be drawn from the > information presented thus far. > > > > No, it doesn't demonstrate that that.... [As I said above] the > scales don't > > even start below 3.7 nm > > See the brief description of "auto scaling" above. > > > Again, not so, the Zetasizer does not "see" particles in the nanometer > > range -- per Malvern Instruments. > > A rather misinformed comment, wouldn't you say, given the fact > that there is a size distribution plot that clearly shows a huge > volume peak at 2.4 nm that is available for all to see at: > > http://www.silver-colloids.com/Misc/Smalltest.html > > Given your exceptional eyesight (able to see micron particles > with the naked eye), you too may be able to see the numbers on > the plot and in the corresponding table of values on page 2 of > the size report. > > Please notice the table lists 1.3 nm as the smallest reported value. > Isn't auto scaling a wonderful thing! > > > > Great, it's something to look forward to.... > > I will take that as a positive comment, thank you! > > > frank key > > > > -- > 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] > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > List maintainer: Mike Devour <[email protected]> > >
