Method of producing particle-dispersed liquid

1. A method of producing a particle-dispersed liquid, using a channel of micro width having a core flow channel, comprising:

sending the particle-dispersed liquid containing larger particles to an inner portion of the core flow channel;

separating and removing the larger particles from the particle-dispersed liquid based on an outward force resulting from a velocity gradient of the particle-dispersed liquid; and

sending the removed larger particles to an outermost part of the core flow channel;

wherein the core flow channel is circular in cross-section, an outer diameter of the core flow channel is 50 to 5,000 μm, and wherein the larger particles have a 2.5 times larger diameter than a volume average diameter of the particles in the particle-dispersed liquid.

2. The method according to claim 1 , wherein in the step of sending and removing, a core flow in the core flow channel is a laminar flow.

3. The method according to claim 1 , wherein the core flow channel makes an angle in a range of 0 to 45 degrees to a direction of gravitational or buoyant force.

4. The method according to claim 1 , wherein volume average diameter of the particles in the particle-dispersed liquid is in a range of 0.1 μm to 1,000 μm.

5. The method according to claim 1 , wherein a velocity of flow at a sending liquid portion of the particle-dispersed liquid is in a range of 1 to 1000 mm per second.

6. The method according to claim 1 , wherein a circular cross-section of the core flow channel is in a range of 10 to 4000 times as large as a volume average diameter of the particles in the particle-dispersed liquid.

7. The method according to claim 1 , wherein a specific gravity of the particles is in a range of 0.87 to 21 times as large as that of a medium liquid of the particle-dispersed liquid.

8. The method according to claim 1 , wherein a content of the particles in the particle-dispersed liquid is in a range of 0.1 to 60 vol. %.

9. A method of producing a particle-dispersed liquid, using a micro-channel having a core flow channel, comprising:

sending the particle-dispersed liquid containing indeterminately shaped particles to an inner portion of the core flow channel;

separating and removing the indeterminately shaped particles from the particle-dispersed liquid based on an outward force resulting from a velocity gradient of the particle-dispersed liquid; and

sending the removed indeterminately shaped particles to an outermost part of the core flow channel;

wherein the core flow channel is circular in cross-section, an outer diameter of the core flow channel is 50 to 5,000 μm, and a form factor,

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1

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of the indeterminately shaped particles is 20 or more larger than an average form factor of the particles in the particle-dispersed liquid.

10. The method according to claim 9 , wherein in the step of sending and removing, a core flow in the core flow channel is a laminar flow.

11. The method according to claim 9 , wherein the core flow channel makes an angle in a range of 0 to 45 degrees to a direction of gravitational or buoyant force.

12. The method according to claim 9 , wherein volume average diameter of the particles in the particle-dispersed liquid is in a range of 0.1 μm to 1,000 μm.

13. The method according to claim 9 , wherein a velocity of flow at a sending liquid portion of the particle-dispersed liquid is in a range of 1 to 1000 mm per second.

14. The method according to claim 9 , wherein a circular cross-section of the core flow channel is in a range of 10 to 4000 times as large as a volume average diameter of the particles in the particle-dispersed liquid.

15. The method according to claim 9 , wherein a specific gravity of the particles is in a range of 0.87 to 21 times as large as that of a medium liquid of the particle-dispersed liquid.

16. The method according to claim 9 , wherein a content of the particles in the particle-dispersed liquid is in a range of 0.1 to 60 vol. %.