haha, my ignorance.
http://www.simpas.unsw.edu.au/publications/2009/52-Role%20of%20citric%20acid%20in%20the%20formation%20of%20silver%20nanoplates%20through%20a%20synergistic%20reduction%20approach.pdf
This study discusses the function of citrate ions in the synthesis of
silver nanoplates through a synergetic reduction
approach in ambient conditions. It was found that the citrate ions can
play multiple roles in the synthesis process,
including a reducing agent, a stabilizer, and a complex agent, and they
show some unique features under the reported
conditions. The reducing ability of these citrate ions was shown to be
weaker than that of sodium borohydride and/or
L-ascorbic acid used in the same system. The stability in the shape/size
control of silver particles is weaker than that of
other surfactants tested in the present system, such as
bis(2-ethylhexyl)sulfosuccinate (AOT) and thiols. Citrate ions
could form a silver complex with silver ions as [Ag2
þ
3 3 3 citrate] or [Ag3(C6H5O7)nþ1]3n-, as confirmed by electrospray
ionization (ESI) mass spectrometry and the kinetic analysis that the
molar ratio of citric acid or sodium citrate to silver
ions can greatly influence the reaction rate and, hence, the particle
growth of silver nanoparticles. Such a complexing
effect is further confirmed by the use of chelating ions (e.g.,
[Fe(CN)6]4-) to form Agn[Fe(CN)6]n-4, which can largely
influence the synthesis of silver nanoparticles. These results show some
formation results of generating silver nanoplates
involving citrate ions, which are useful in the shape-controlled
synthesis of other metallic nanoparticles with desirable
functionalities.
Citrate ion, a commonly used reductant in metal colloid synthesis,
undergoes strong surface interaction with
silver nanocrystallites. The slow crystal growth observed as a result of
the interaction between the silver
surface and the citrate ion makes this reduction process unique compared
to other chemical and radiolytic
synthetic methods. Addition of citrate ions to preformed silver colloids
(Ag-capped SiO2) results in the
complexation of citrate with silver colloids. The difference absorption
spectra of SiO2-Ag colloids in the
presence of citrate ions show an increase in the absorption at 410 nm
with increase in concentration of citrate.
The apparent association constant as determined from these absorption
changes is 220 M-1. Pulse-radiolysis
studies show that citrate ions complex with the silver seeds and
influence the particle growth. For example,
one of the primary intermediates, Ag2
+ produced in the radiolytic reduction of silver ions, readily interacts
with citrate to form a complex absorbing in the 410-nm region. The
complex, [Ag2
+-citrate], undergoes
slower transformations compared to uncomplexed Ag2
+. This slow transformation of the citrate complex
eventually leads to the formation of larger clusters of silver.
Steady-state and pulse-radiolysis experiments
provide evidence for the multiple roles of citrate ions as a reductant,
complexant, and stabilizer that collectively
dictate the size and shape of silver nanocrystallites.
On 11/28/2012 3:48 PM, Marshall wrote:
Silver citrate is an ionic compound, and when dissolved in water is
100% ionic, no colloid particles at all.
Marshall
On 11/28/2012 5:35 PM, mgperrault wrote:
Silver citrate would be mainly particles?
On 11/28/2012 2:35 PM, Marshall wrote:
Frank Key produces colloidal silver in the 90 plus % area. Not
inexpensive though. I think it can be produced by sputtering.
Marshall
On 11/28/2012 2:49 PM, Alex Flex wrote:
Hello My name is Alex iam new here.
As some of you may know there is a patent for Silvercillin (I think
its http://www.google.com/patents/US7135195 ).
Questions:
a.) If iam not mistaken whats special about this CS is that is has
99% Silver Particles and not IONS, can somebody please confirm this?
b.) Id like to know if I can make this at home Iam willing to
invest some money if necessary, or perhaps buy a generator capable
of doing this?
c.) If the answer to B is that the procedure is very complex, does
anybody know of lab proof CS manufacturers that can deliver this at
a reasonable price?
Thanks all!!!
-- Alex
--
The Silver List is a moderated forum for discussing Colloidal Silver.
Rules and Instructions: http://www.silverlist.org
Unsubscribe:
<mailto:silver-list-requ...@eskimo.com?subject=unsubscribe>
Archives:
http://www.mail-archive.com/silver-list@eskimo.com/maillist.html
Off-Topic discussions: <mailto:silver-off-topic-l...@eskimo.com>
List Owner: Mike Devour <mailto:mdev...@eskimo.com>
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1427 / Virus Database: 2629/5424 - Release Date:
11/28/12
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1427 / Virus Database: 2629/5424 - Release Date: 11/28/12
