I am trying to prepare silica nanoparticles. I followed the literature as suggested that in all reagent in ethanol mixture added TEOS, in some other literature they added Ammonia solution to mixture of all other reagents. all reagents and concentrations and temperature are fix. which one is give best results of silica particles. if these two process has effect on size and shape, then why and how it effects. Please explain or share literature of particular discussion.
Answers are expected from experience researchers.
Thank you
Raj Kumar
Ammonia is added as a pH modifier/stabilizer. pH has a large influence on virtually every property associated with (aqueous) nanotechnology modifying the particle charge/zeta potential in the system. In certain cases (e.g. Ag nanoparticles) the precursor to be reduced to the colloidal metal can be provided in the complexed form (the diammine in the case of Ag). Certain species will be soluble in low or high pH's and silica is soluble much above pH 12. The concentration of ammonia can be important too as well as the pH.
It is clear that any change to the conditions or reactants will almost certainly provide a change to the product(s).
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