Eutectic colloidal crystal, eutectic colloidal crystal solidified body, and methods for producing them

Patent metadata

Field	Value
Publication number	US-2017361297-A1
Application number	US-201515534932-A
Country	US
Kind code	A1
Filing date	Dec 2, 2015
Priority date	Dec 12, 2014
Publication date	Dec 21, 2017
Grant date	—

Abstract

[Object] Provided are a “eutectic colloidal crystal” which is an aggregate of plural kinds of colloidal crystals having different lattice constants, a solidified body of the eutectic colloidal crystal, and methods for producing them.
[Resolution means] The eutectic colloidal crystal of the present invention contains two or more kinds of colloidal crystals composed of substantially monodispersed colloidal particles having different particle sizes. This eutectic colloidal crystal is obtained by providing a colloidal dispersion of two or more kinds of colloidal particles having different particle sizes, and a polymer which will not substantially adsorb to the colloidal particles (the coefficient of variation in particle size of these colloidal particles is less than 20%) dissolved in a dispersion medium (dispersion preparation process), and allowing the colloidal dispersion to stand (eutectoid process).

First claim

1 - 14 . (canceled)

15 . A eutectic colloidal crystal comprising two or more kinds of opal-type colloidal crystals composed of colloidal particles having a coefficient of particle size variation of less than 20%, the colloidal particles being mixed together at fixed positions.

16 . The eutectic colloidal crystal of claim 15 , wherein the lattice planes of the colloidal crystals are oriented on the same plane.

17 . The eutectic colloidal crystal of claim 15 , wherein the colloidal crystals are composed of polymer colloidal particles.

18 . The eutectic colloidal crystal of claim 17 , wherein the polymer colloidal particles are composed of polystyrene.

19 . The eutectic colloidal crystal of claim 15 , wherein the average particle size of the colloidal particles is from 1 nm to 50 μm.

20 . The eutectic colloidal crystal of claim 15 , wherein the colloidal crystals are composed of silica particles.

21 . A eutectic colloidal crystal solidified body prepared by immonbilizing the eutectic colloidal crystal of claim 15 by a immonbilizing agent.

22 . A method for producing eutectic colloidal crystal comprising:
a dispersion preparation process of preparing a colloidal dispersion where two or more kinds of colloidal particles having different particle sizes are dispersed in a dispersion medium which dissolves a polymer, the coefficient of variation of the particle size of the colloidal particles is less than 20%, and the specific gravity of the dispersion medium is smaller than that of the colloidal particles; and a eutectoid process of depositing two or more kinds of opal-type colloidal crystals having different lattice constants by allowing the colloidal dispersion to stand.

23 . The method for producing the eutectic colloidal crystal of claim 22 , wherein the colloidal crystals are composed of polymer particles.

24 . The method for producing the eutectic colloidal crystal of claim 22 , wherein the colloidal crystals are composed of polystyrene particles.

25 . The method for producing the eutectic colloidal crystal of claim 22 , wherein the colloidal crystals are composed of silica particles.

26 . The method for producing the eutectic colloidal crystal of claim 22 , wherein the average particle size of the colloidal particles is from 1 nm to 50 μm.

27 . The method for producing the eutectic colloidal crystal of claim 22 , wherein the volume fraction of the colloidal particles to the colloidal dispersion is from 0.001 to 0.1.

28 . A method for producing a eutectic colloidal crystal solidified body comprising:
a dispersion preparation process of preparing a colloidal dispersion where two or more kinds of colloidal particles having different particle sizes are dispersed in a dispersion medium which dissolves a polymer and a photocurable resin, the coefficient of variation of the particle size of the colloidal particles is less than 20%, and the specific gravity of the dispersion medium is smaller than that of the colloidal particles; a eutectoid process of depositing two or more kinds of opal-type colloidal crystals having different lattice constants by allowing the colloidal dispersion to stand; and a photoirradiation process of immonbilizing the eutectic colloidal crystal formed in the eutectoid process by photoirradiation.

Assignees

• Univ Nagoya City Public Univ Corp

Inventors

• Yamanaka Junpei
• Toyotama Akiko
• Okuzono Tohru
• Uda Satoshi
• Nozawa Jun

Classifications

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L2205/18

  Spheres · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• B01J13/0065 Primary

  containing an organic phase · CPC title

• C08L25/06

  Polystyrene · CPC title