Method of forming microsphere having structural color

Patent metadata

Field	Value
Publication number	US-2017103833-A1
Application number	US-201615231871-A
Country	US
Kind code	A1
Filing date	Aug 9, 2016
Priority date	Apr 14, 2009
Publication date	Apr 13, 2017
Grant date	—

Abstract

Provided is a method of forming a microsphere having a structural color, which includes providing a composition for generating a structural color including a curable material and magnetic nanoparticles dispersed in the curable material, forming an emulsion by adding the composition for generating a structural color to an immiscible solvent, arranging the magnetic nanoparticles located in the emulsion droplet of the curable material in a one-dimensional chain structure by applying a magnetic field to the emulsion, and fixing the chain structure by curing the emulsion droplet.

First claim

What is claimed is:

1 . A microsphere having a structural color comprising:
a solid matrix; and magnetic nanoparticles aligned in one-dimensional chain structures to exhibit a structural color within the solid matrix.

2 . The microsphere according to claim 1 , wherein the magnetic nanoparticles include a superparamagnetic material.

3 . The microsphere according to claim 1 , wherein the magnetic nanoparticles have a structure coated with a shell layer surrounding a core formed in a cluster of magnetic nanocrystals.

4 . The microsphere according to claim 3 , further comprising a solvation layer coating a surface of the magnetic nanoparticles.

5 . The microsphere according to claim 1 , wherein the microsphere contains an ordered structure of a photonic crystal due to alignment of the magnetic nanoparticles, and a diffraction angle of light passing through the microsphere is changed with rotation of the microsphere.

6 . The microsphere according to claim 1 , wherein the microsphere is dispersed in a phase-changeable matrix.

7 . A display device comprising a microsphere rotated by an external magnetic field,
wherein the microsphere contains an ordered structure of a photonic crystal due to alignment of magnetic nanoparticles, and a diffraction angle of light passing through the microsphere is changed with rotation of the microsphere.

8 . The display device according to claim 7 , wherein the magnetic nanoparticles include a superparamagnetic material.

9 . The display device according to claim 7 , wherein the magnetic nanoparticles have a structure coated with a shell layer surrounding a core formed in a cluster of magnetic nanocrystals.

10 . The microsphere according to claim 7 , further comprising a solvation layer coating a surface of the magnetic nanoparticles.

11 . The display device according to claim 7 , wherein the microsphere is dispersed in a phase-changeable matrix.

12 . The display device according to claim 7 , wherein, when a phase-changeable matrix is in a liquid phase, adjusting an angle of the external magnetic field changes an orientation of the microsphere.

Assignees

• Snu R&Db Foundation

Inventors

• Kwon Sunghoon
• Kim Hyoki
• Yin Yadong
• Ge Jianping

Classifications

• G02B1/005

  made of photonic crystals or photonic band gap materials (photonic band-gap structures or photonic lattices in integrated optics G02B6/1225; photonic band-gap structures or photonic lattices in optical fibres G02B6/02295) · CPC title

• G02F1/29

  for the control of the position or the direction of light beams, i.e. deflection · CPC title

• C08K2201/01

  Magnetic additives · CPC title

• H01F1/344

  Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4 · CPC title

• C01P2006/42

  Magnetic properties · CPC title