Imagine you synthesize a nanomaterial by hydrothermal method.
pH controls the efficiency of chemical mechanis. This occurs because of by charge balance inside a liquid matrix. And it prevents the growing of particle size.
pH of a chemical reaction is a key parameter since the atomic site preferencies of reactants are determined.
pH helps in the reduction of size of the nano material. in general to attain size range in nanometer the pH of the reaction medium as to be maintained greater than 9
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Changes of pH induce different speciations, and therefore different reactivities, sometimes significantly. Depending on the wanted reaction, it is required to have the highest amount of the relevant chemical species, whereas other species may be not stable in non-optimal pH ranges. Whereas these statements are obvious for preparing bulk materials by sol-gel method, they are even more important for preparing nanomaterials for which small changes of experimental conditions will have a serious impact on the results.
Alain
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