Overbrewed colloidal silver

submitted by [deleted] from self.ColloidalElements

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[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (5 children)

Well, the ones we make with the electrical process use electrical repulsion. You are taking textbook definitions and assuming they do not apply to a particular case where they do apply.

How do you think multi-atom AG particles stay suspended in distilled water? Magic?

[–]bobbobbybob 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (4 children)

How do you think multi-atom AG particles stay suspended in distilled water? Magic?

They are very very small, and each of the surface atoms is able to enter into an ionic state, making an ionically dissolved nanoparticle.

'electrical repulsion' is an odd term. why would a silver particle retain an electrical charge, when in solution? the electrons would just wander away. Ionic solubility is related to electron orbitals, not some extraneous charge.

Also, not sure why the negativity. <geek joke>

[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (3 children)

You have it backwards. How on Earth do you have ions out of a low-voltage, low-amp power supply? Unless they are reacting chemically with something, the silver atoms are NOT IONS. This is not a solution, it's a SUSPENSION. That is the definition of COLLOID. A solution is something else entirely.

It's not ionic. It's not a solution.

[–]bobbobbybob 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (2 children)

https://pubs.acs.org/doi/abs/10.1021/acs.langmuir.5b03686

If you look, the suspension of the silver colloid is facilitated by ionisation of surface particles (indeed, this is the mechanism for silver delivery by the nano particles).

but for colloids in general, it is jsut the size that keeps them suspended. they are so tiny they don't settle.

I'm still pretty sure that an ionic component is required for true colloids, but maybe i'm wrong. My experience comes from emulsions (liquid colloids), which require an emulsifying agent to bridge between the fat and water.

Edit. for silver, at least, the 410nm plasmon band confirms silver ion reduction in colloidal nanoparticles: https://www.sciencedirect.com/science/article/pii/S1876619609003933

[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

It's bullshit. You can't ionize surface atoms in a metallic particle. That's not how metals work.

[–]bobbobbybob 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

that's not what all the science says. Indeed, the entire mechanism of silver colloid action is to release ionic silver over time.

But you are right about charging those nano particles. depending on the mechanism you use to make them, they can carry a charge as well, so the citrate reduction made ones are negatively charged and repel each other. Thanks for the lead into such an interesting topic.