Marshall, I didn't know till yesterday that the Figures were there. Great work reading those postage size pictures! I am surprised that there was some residue silver nitrate. Sloppy lab work.
I was interested in the particle size graph but I couldn't read the axis markings. I looked for studies regarding making silver nanoparticles from silver nitrate. I found a number of them. The particle sizes the achieved were mostly in the range of 200 to 10 nm. I did finally find one that claimed 2 nm. It appears that under 15 nm isn't easy. I think the particle size is important. If it takes days to convert a 15 nm particle it still may take a short time with smaller particles. For example here are some ROM estimates on silver particle sizes: * 1 nm, approx 30 atoms * 2.34 nm, approx 400 atoms * 15 nm, approx 100,000 atoms My recolection is that Mesosilver claims particle sizes under 2 nm and that many are as small as 9 atoms. EIS with H2O2 has many as small as a couple atoms. Will they convert in stomach acid? Plus, when digesting, the stomach churns continuously. Isn't that similar to magnetic stirring? - Steve N ----- Original Message ----- From: Marshall Dudley [mailto:[email protected]] Sent: Wednesday, September 22, 2010 10:59 AM To: [email protected] <[email protected]> Subject: EXTERNAL:Re: CS>CS and killing of pathogens Without being able to read the whole article, it gives more questions than it answers. If I am interpreting figure 2 correctly, then there is a substantial amount of silver nitrate in the sample. Then it appears that they detected silver chloride in the result after mixing with HCl. If there is ANY nitrate left, there will be silver chloride produced. The concentration and temperature are still unknowns as well. One of the figures implies that the conversion took 3 days, and that magnetic stirring was used. If that is the case it would not be applicable to the stomach where contents normally reside for no more than a couple of hours. Also magnetic stirring can have a significant effect as well. So all in all, without being able to read the entire article it is hard to say if the results have anything to do with EIS in the stomach. If anyone has a library close that carries this journal it should be possible to get a copy of the article. I will try the UT library. Marshall Norton, Steve wrote: > Marshall, > > I do not have a copy of the article. The link I provided does have a > little more info if you click the Figures/Tables tab above the abstract. > It provides small low resolution figures with the text associated with > the figure: > > > Fig. 1. XRD patterns of samples. (a) Ag nanoparticles prepared by using > AgNO3 as the silver source and obtained by drying the Ag colloidal > solution on a single crystal silicon substrate, (b) the product of AgCl > obtained from the reaction of Ag nanoparticles with hydrochloric acid, > (c) commercial Ag powder, (d) after commercial Ag powder was added into > hydrochloric acid under magnetic stirring for 3 days. > > Fig. 2. UV-vis absorption spectra. Dotted curve: the Ag colloidal > solution prepared. Dashed curve: AgNO3 aqueous solution. Solid curve: > the upper transparent solution after the reaction of the Ag colloid with > hydrochloric acid. > > Fig. 3. (a) TEM micrographs of Ag nanoparticles prepared using AgNO3 as > the silver source, (b) The histogram of Ag particle size distribution > > Fig. 4. (a) TEM micrograph of the polyacrylamide (PAM)/silver > nanocomposite, (b) XRD pattern of PAM/silver nanocomposite, (c) XRD > pattern of the product after the reaction of PAM/silver nanocomposite > with hydrochloric acid. > > > It does not give intermediate results before the end of the three days > nor does it give the concentration of the HCl used. It appears to me > that all the silver particles in the test were converted to silver > chloride. > > - Steve N > > > -----Original Message----- > From: Marshall Dudley [mailto:[email protected]] > Sent: Tuesday, September 21, 2010 1:00 PM > To: [email protected] > Subject: Re: CS>CS and killing of pathogens > > Does anyone have a copy of this article? All I can get is the abstract, > > and $37.50 for this seems rather absurd. Long ago I tried mixing > colloidal silver with hydrochloric acid and was unable to get any > observed reaction without heating it (with the colloidal part). There > is some very important information missing from the abstract, such as > what concentrations, temperatures are needed and how long the reaction > takes. > > Marshall > > > -- > The Silver List is a moderated forum for discussing Colloidal Silver. > Rules and Instructions: http://www.silverlist.org > > Unsubscribe: > <mailto:[email protected]?subjectsubscribe> > Archives: > http://www.mail-archive.com/[email protected]/maillist.html > > Off-Topic discussions: <mailto:[email protected]> > List Owner: Mike Devour <mailto:[email protected]> > > > > > > >
