Hi. I have a new challenge and that is "how to disperse Nano SiO2 in water by means of a chemical agent without cuasing damage concrete stength"?

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Farid Movassagh-Alanagh

I think you can use Iodine in order to suspend the Nano-SiO2 particles in water. Iodine reacts with water and release protons. these protons absorb to the surface of particles and positively charge their surface.

I2(l) + H2O(l) -> OI-(aq) + 2H+(aq) + I-(aq)

Alan F Rawle

If it's a powder, you can't disperse it in water and expect to produce discrete nanosized particles. The only dispersing agent is energy - thee are no 'magic' chemicals that disperse (additives wet or stabilize or both). Calculate how much you need to produce new surfaces of nanodimensions. For a primer providing more references see:

Nov 11th, 2008. Dispersion and nanotechnology http://tinyurl.com/hpywsge