I now have the full article. Anyone wanting it please let me know and
I will email it to you.
There are some problems with their methodology.
1. They say they make CS by two methods, one which leaves a residue of
silver nitrate in the solution, and the other which does not. I cannot
find which one they used for the data they are producing.
2. They say that they remove all AgO2 from the non-nitrate solution by
centrifuge. Fact is that it is impossible to removed dissolved silver
oxide and silver hydroxide by centrifuge.
3. Their curve shows a rise on the front end which indicates silver
oxide/hydroxide before adding HCl, but turns down after adding it,
indicating that ionic silver was converted to silver
4. They say that adding HCl produced silver chloride immediately as
evidenced by the solution turning milky, but that happens anyway with
silver oxide or nitrate in the solution from reactions with them.
5. They assume that the loss of the colloid is by producing silver
chloride instead of aggregation and precipitation when HCl is added. But
it is known that changing the pH of a solution significantly from 7 will
cause aggregation and precipitation.
5. Figure 5 shows a peak for colloidal silver of one size particle in
(b). In (c) it shows some AgCl peaks and a significant broadening of the
spectrum. This broadnening is I believe proof that instead of small
consistent particles, it now has variable sized particles, as would be
expected if the HCl was causing aggregation.
There are too many holes in the paper for me to be convinced that they
have not done junk science. I conclude from the data they have supplied
that the ionic portion reacted with HCl and that the colloidal portion
aggregated, which is exactly what I would have expected.
Marshall
On 9/22/2010 11:59 AM, Marshall Dudley wrote:
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
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