Method of generating structural color

• US 8,889,234 B2
• Filed: 10/12/2011
• Issued: 11/18/2014
• Est. Priority Date: 04/14/2009
• Status: Active Grant

• Current Assignee: Seoul National University R&DB Foundation (Seoul National University)
• Original Assignee: Seoul National University R&DB Foundation (Seoul National University)
• Inventors: Kwon, Sunghoon, Kim, Hyoki
• Primary Examiner(s): Cleveland, Michael
• Assistant Examiner(s): TADAYYON ESLAMI, TABASSOM
• Application Number:
  US13/271,674
• Publication Number:
  US 20120064309A1
• Time in Patent Office: 1,133 Days
• Field of Search: 427/502, 427/589, 427/162, 427/163.1, 427/457, 427/547, 427/550, 349/78, 349/97, 252/62.65, 977/811
• US Class Current: 427/547
• CPC Class Codes: B01J 19/12 employing electromagnetic waves
• CPC Class Codes: B01J 19/123 Ultraviolet light
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: B82Y 25/00 Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
• CPC Class Codes: C01P 2006/42 Magnetic properties
• CPC Class Codes: C08K 2201/01 Magnetic additives
• CPC Class Codes: C08K 2201/011 Nanostructured additives
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 9/08 Ingredients agglomerated by treatment with a binding agent
• CPC Class Codes: C09C 1/24 Oxides of iron
• CPC Class Codes: C09C 3/10 Treatment with macromolecular organic compounds C09C3/006 takes precedence
• CPC Class Codes: C09D 11/50 Sympathetic, colour changing or similar inks
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/69 Particle size larger than 1000 nm
• CPC Class Codes: G02B 1/005 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 Class Codes: G02B 2207/101 Nanooptics
• CPC Class Codes: G02B 5/201 in the form of arrays
• CPC Class Codes: G02F 1/09 based on magneto-optical elements, e.g. exhibiting Faraday effect
• CPC Class Codes: G02F 1/29 for the control of the position or the direction of light beams, i.e. deflection
• CPC Class Codes: H01F 1/0063 in a non-magnetic matrix, e.g. granular solids granular films H01F10/007
• CPC Class Codes: H01F 1/344 : Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
• CPC Class Codes: Y10T 428/24802 : Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Abstract

Provided is a method of printing a structural color. The method includes providing a first substrate, forming a layer of a composition for generating a structural color including magnetic nanoparticles and a curable material on the first substrate, applying a magnetic field to the layer of the composition for generating a structural color and exhibiting a structural color using a change in lattice spacing of a photonic crystal composed of magnetic nanoparticles depending on the magnetic field strength, and curing the layer of the composition for generating a structural color to fix the lattice spacing of the photonic crystal and to form a structural color printed layer.

Claims

1. A method of printing a structural color comprising:

providing a first substrate;

forming a layer of a composition for generating a structural color including magnetic nanoparticles and a curable material on the first substrate,

applying a magnetic field to the layer of the composition for generating a structural color and exhibiting a structural color through a change in lattice spacing of a photonic crystal composed of magnetic nanoparticles depending on the magnetic field strength; and

curing the layer of the composition for generating a structural color to fix the lattice spacing of the photonic crystal and to form a structural color printed layer.

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

3. The method according to claim 1, further comprising a solvation layer surrounding a surface of the magnetic nanoparticles.

4. The method according to claim 1, wherein the curable material includes a monomer, an oligomer or a polymer having a crosslinkable site.

5. The method according to claim 1, wherein the application of the magnetic field is performed by a permanent magnet or an electromagnet disposed above the layer of the composition for generating a structural color.

6. The method according to claim 1, wherein the curing is performed by photocuring.

7. The method according to claim 1, further comprising:

joining a second substrate having an adhesive layer coated on one side thereof to the structural color printed layer; and

releasing the second substrate from the first substrate, thereby transferring the structural color printed layer to the second substrate.

8. The method according to claim 1, further comprising a coating layer formed on the first substrate.

9. The method according to claim 8, wherein the coating layer is transferred to the second substrate together with the structural color printed layer.

10. A method of generating a structural color comprising fixing an aligned structure of magnetic nanoparticles in a medium to diffract light due to the aligned structure and to generate the structural color,

wherein the aligned structure is produced in a liquid medium, the liquid medium is converted into a solid medium, and thus the aligned structure is fixed.

11. The method according to claim 10, wherein the aligned structure is produced by an external magnetic field.

12. The method according to claim 10, wherein the liquid medium includes a photocurable material.

13. The method according to claim 12, wherein the fixation is performed by applying UV rays to the medium.

14. The method according to claim 10, wherein the aligned structure is produced in a phase-changeable medium reversibly changed between a liquid and a solid.

15. A method of producing a structural color comprising:

tuning an aligned structure by aligning magnetic nanoparticles containing a superparamagnetic material in a photocurable material; and

fixing the aligned structure by curing the photocurable material,

wherein the tuning and the fixing are repeated to perform multi-color patterning.

16. The method according to claim 15, wherein the aligned structure is formed by assembling the magnetic nanoparticles in chain structures along the magnetic field lines by an external magnetic field.

17. The method according to claim 15, wherein the structural color is determined by inter-particle distance between the magnetic nanoparticles.

18. The method according to claim 15, wherein the tuning is performed by changing inter-particle distance between the magnetic nanoparticles using an external magnetic field.

19. The method according to claim 15, wherein the fixing is performed by UV rays having a wavelength of 240 to 365 nm.

20. The method according to claim 15, further comprising adding a hydrogen-bonding solvent to the photocurable material and forming a solvation layer around the magnetic nanoparticle.