| 摘要 |
<p>Provided is a method for producing a nanoparticle. Provided especially is, in the method for producing a nanoparticle to separate a diketopyrrolopyrrole pigment, a method for separating an ±-type diketopyrrolopyrrole pigment nanoparticle having high crystallinity by carrying out separation of the diketopyrrolopyrrole pigment and crystal type transformation to the ±-type with substantially a single step. The ±-type diketopyrrolopyrrole pigment nanoparticle is separated by mixing a diketopyrrolopyrrole pigment solution having the diketopyrrolopyrrole pigment dissolved in a solvent and an alcohol solvent containing an alcohol compound solvent in a thin film fluid formed between at least two processing surfaces 1 and 2 arranged to be opposite to each other so as to be able to approach to and separate from each other, at least one of which rotates relative to the other. The method is characterized in that an acidic substance is contained in at least any one of the diketopyrrolopyrrole pigment solution and the alcohol solvent at this moment.</p> |
