Method for producing nanoparticles

A method for producing nanoparticles, the method comprising:

• providing at least two processing surfaces arranged opposite to each other, the at least two processing surfaces being configured to be able to approach to and separate from each other, at least one of which rotating relative to the other;
• providing at least three kinds of fluids to be processed, comprising a first fluid, a second fluid, and a third fluid,
• wherein, the first fluid is a diketopyrrolopyrrole pigment solution containing at least one kind of diketopyrrolopyrrole pigment dissolved in a solvent,
• the second fluid is an alcohol solvent containing at least one kind of alcohol compound solvent, and
• the third fluid contains an acidic substance;
• and
• mixing the at least three kinds of fluids to be processed in a thin film fluid formed between the at least two processing surfaces, thereby separating the diketopyrrolopyrrole pigment,
• wherein a pH value of a mixed solution obtained by mixing the at least three kinds of fluids in the thin film fluid formed between the at least two processing surfaces is less than or equal to 7, so that substantially only α-type diketopyrrolopyrrole pigment nanoparticles are separated without substantially separating a β-type diketopyrrolopyrrole pigment.

A method for producing nanoparticles, the method comprising:

• providing at least two processing surfaces arranged opposite to each other, the at least two processing surfaces being configured to be able to approach to and separate from each other, at least one of which rotating relative to the other;
• providing at least two kinds of fluids to be processed,
• wherein, at least one of the at least two kinds of fluids to be processed is a microparticle material solution that dissolves the microparticle material in a solvent capable of being a good solvent of the microparticle material and at least one of the at least two kinds of fluids to be processed other than the above microparticle material solution is a solvent capable of being a poor solvent of the microparticle material;
• and
• converging the microparticle material solution and the solvent capable of being a poor solvent in a thin film fluid formed between the at least two processing surfaces, thereby separating the nanoparticles,
• wherein, the nanoparticle material solution and the solvent capable of being a poor solvent have a temperature difference of 5° C. or more at least at the moment of the convergence, and
• wherein a pH value of a mixed solution obtained by mixing the at least two kinds of fluids in the thin film fluid formed between the at least two processing surfaces is less than or equal to 7, so that substantially only α-type diketopyrrolopyrrole pigment nanoparticles are separated without substantially separating a β-type diketopyrrolopyrrole pigment.

A method for producing nanoparticles, wherein:

• the method comprising:
• providing at least two processing surfaces arranged opposite to each other, the at least two processing surfaces being configured to be able to approach to and separate from each other, at least one of which rotating relative to the other;
• providing at least two kinds of fluids to be processed,
• wherein, at least one of the at least two kinds of fluids to be processed is a microparticle material solution that dissolves the microparticle material in a solvent capable of being a good solvent of the microparticle material and at least one of the at least two kinds of fluids to be processed other than the above microparticle material solution is a solvent capable of being a poor solvent of the microparticle material and
• converging the microparticle material solution and the solvent capable of being a poor solvent in a thin film fluid formed between the at least two processing surfaces, thereby separating the nanoparticles,
• wherein, a temperature difference between the microparticle material solution and the solvent capable of being a poor solvent is controlled by a temperature difference control mechanism,
• wherein, the respective fluids to be processed having the temperature difference thus controlled are introduced into between the processing surfaces,
• wherein, in the temperature difference control mechanism, at least one of the fluid to be processed is heated or cooled, and
• wherein a pH value of a mixed solution obtained by mixing the at least two kinds of fluids in the thin film fluid formed between the at least two processing surfaces is less than or equal to 7, so that substantially only α-type diketopyrrolopyrrole pigment nanoparticles are separated without substantially separating a β-type diketopyrrolopyrrole pigment.