The process I use is the sol-gel method, which uses TBT added to 100ml ethanol and 0.4ml, 0.08mol/l KCL solution to prepare 900nm diameter titanium dioxide microspheres. After aging at 10 degrees Celsius for 20 hours, SEM characterization is performed. The morphology is as shown below shown：
I want to know how I can make TIO2 more monodisperse？
Очень неплохо Runji Chen ! You've got the spheres. There are particles stuck together. To obtain more uniform particles, make more dilution. If it doesn’t work, write, there are other options.
Oleg Novikov Thank you for your suggestion. Previously, I used very low-concentration ethanol dispersions for SEM sample preparation, but no obvious spheres could be observed, so I used a conventional oven for drying and sample preparation. But the spheres always come together.
Let me suggest using the purification method for the current situation. The process of purification can be described as follows:.
dispersion in the solvent, centrifugation at low speed (removing large particles), and the liquid part;
the liquid part from the previous test is taken and also centrifuged at high speed, so the main (desirable) product is in solid form, and the other parts are removed with the liquid part.
The theory of the process is described by Stokes' law as an empirical law for the frictional force, also called drag force, exerted on spherical objects with very small Reynolds numbers in a viscous fluid.
https://en.wikipedia.org/wiki/Stokes%27_law
It will be much easier to have a particle size analyzer for the time and speed of a centrifuge adjustment.
L. V. Gorobinskiy Thanks for your suggestion, it enlightened me. Let me read it carefully and try it out
By searching for keywords such as "improving the dispersion of TIO2 aqueous solution", it was found that NAOH and some surfactants such as PAAS can be used to improve the dispersion by promoting electrostatic interaction and enhancing spacing.