One of many methods to synthesize a Perovskite, is to make a solution with the precursors. Eg:

An organic-inorganic perovskite like CH3NH3PbI3 can be synthesized by making a precursor solution, using Methylammonium Iodide (CH3NH3I) and Lead(II) Iodide (PbI2) dissolved in solvents like Gamma-Butyrolactone, Dimethylformamide or DMSO. If you make the correct procedure and mix the correct proportion of the precursors and solvents, you will get a solution.

If there are colloidal particles in your "solution", you should review the concentration of precursors you used.

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Bests Regards

Ricardo Tadeu

Yh UG No

CH3NH3PbI3 belongs to hydroropes and does not form micelles. Hydrotropes salting-in non-polar substances, but do not form micelles. If the salting-in molecule is large, then micelles can form.

Thank you so much Ricardo Tadeu Maia . So if there exist colloidal particles in solution, one of the reason is that the concentration of precursor is too high? I have read a literature which compared different concentration solution and detected particles diameter and distribution by DLS. Form 10mg/ml to 300mg/ml, the particles diameter in solution varies from 10nm to 200nm and regardless of the particles diameter is small or large, the author called them "micellar". I want to konw if the author's formulation is forse or the "micellar" is a more extensive concept?

Thank you so much Yuri Mirgorod . I want to konw if the "micelles" has a more extensive concept? In some literatures, many called the particles in precursor solution as "micelles".

You are welcome, Yh UG No. I synthesize this CH3NH3PbI3 perovskite, and an usual concentration is 1 Molar for each precursor, PbI2 and CH3NH3I, in solvent like DMF or DMF:DMSO. You can find some papers doing more concentrated, but this is an "average" value researchers do, for this perovskite.

Based in what you described, it looks like the author you read wanted to synthesize these colloid particles, because 300 mg/mL of PbI2 in solvent like DMF is perfectly soluble. I can dissolve more than 400 mg in just 1 mL of DMF. As I said, there are many methods to synthesize perovskites. Maybe in this one, the method is to synthesize these perovskites particles in solvent.

Yh UG No

The question of the term "micelles" is interesting. Micelles are commonly referred to as surfactant aggregates. They are spherical, ellipsoid, worm-shaped, lamellar. There are polymer micelles, protein micelles. They are united by hydrophobic interaction. It arises as a result of the fact that the interaction of water-water molecules is greater than the interaction of carbon groups of surfactants. Or as a result of gaining the Gibbs energy, the formation of a cavity in water to contain the micelles.

According to our new theory for ionic spherical micelles, it occurs due to the nuclear quantum effect.

Preprint Nuclear quantum effect in aqueous micellar surfactant solutions

Preprint The Role of Zero-Point Energy of Water in Micelle Formation ...

Therefore, the soap solution in which we wash ourselves is a quantum water material. It can be applied in quantum technologies.