I performed an experiment, with a serial dilution of 30% SiO2 colloidal solution, and the results seem to show a greater colloidal SiO2 concentration produces a smaller radius. Should this be the case and if so why?
I didn't get your experiment. But in general, concentration of chemicals do change particle size. However there are a lot of things to look before giving you answers: for example, are you measuring radius of particles in suspension (by DLS for example), or measuring sizes of aggregates after drying (TEM/SEM/AFM)? Do you use any dispersants in your process?
Dear all, I think better to focus on viscosity of the system rather than concentration. Sometimes even for concentrated composition if good solvation is still existing there we be no or minor effect of concentration. My Regards
Luiz Fernando de Sousa Lima The Silica solution was diluted using 0.001 M KNO3 to form 15%, 7.5%, 3.75%, 1.88%, 0.94% SiO2 solutions. The 0.94% SiO2 solution had the largest recorded radius - 2.64 nm compared to 1.3nm for 30% SiO2
Radius was calculated after finding the absorption of the solution from a spectrophotometer
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