System and method for electrostatic alignment and surface assembly of photonic crystals for dynamic color exhibition

Patent metadata

Field	Value
Publication number	US-11506698-B2
Application number	US-202016791244-A
Country	US
Kind code	B2
Filing date	Feb 14, 2020
Priority date	Feb 18, 2019
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

A system and method are disclosed of electrostatic alignment and surface assembly of photonic crystals for dynamic color exhibition. The method includes: dispersing a plurality of photonic crystal chains into a solution; placing the solution of the plurality of photonic crystal chains in a container; and assembling and aligning the plurality of photonic crystal chains in the solution by a local charge build up on a surface of the container to exhibit color.

First claim

What is claimed is:

1. A method of electrostatic alignment and surface assembly of photonic crystals for dynamic color exhibition, the method comprising:
dispersing a plurality of photonic crystal chains into a solution, each of the plurality of photonic crystal chains includes a plurality of nanoparticles;
placing the solution of the plurality of photonic crystal chains in a container; and
assembling and aligning the plurality of photonic crystal chains in the solution in a region of a local charge build up on a surface of the container to exhibit color.

2. The method according to claim 1 , wherein the solution is a non-polar solvent.

3. The method according to claim 1 , wherein the plurality of photonic crystal chains are sensitive to an electric charge on the surface of the container such that the plurality of photonic crystal chains self-assemble or align onto the surface of the container and exhibit color.

4. The method according to claim 1 , wherein the plurality of photonic crystal chains are hydrophobic silica coated nanomaterials, which retain latent charges on a surface of the hydrophobic silica coated nanomaterials when dispersed into a non-polar solvent.

5. The method according to claim 4 , comprising:
applying an electrical charge through the solution or on the surface of the container, and wherein the hydrophobic silica coated nanomaterials align and self-assemble in a region of the electrical charge and exhibit color by diffraction.

6. The method according to claim 4 , further comprising:
placing the container of the solution of the plurality of photonic crystal chains in an environment in which electrically sensitive equipment or highly flammable fuels are used and static discharges are dangerous; and
one or more of viewing, measuring, and sensing the charge build-up on the surface of the container from a change in the color exhibited by the plurality of photonic crystal chains.

7. The method according to claim 1 , further comprising:
manipulating the plurality of photonic crystal chains near a surface or in solution allowing for reflective display technologies using photonic crystal chains having an established electronic device infrastructure.

8. The method according to claim 1 , wherein the plurality of photonic crystal chains are Fe 3 O 4 nanoclusters arranged into one-dimensional (1D) chains and fixed by a coating of SiO 2 to form a linear pea-pod like structure, and the method comprising:
functionalizing the silica surface of the Fe 3 O 4 nanoclusters arranged into the one-dimensional (1D) chains with octadecyltrimethoxysilane.

9. The method according to claim 8 , further comprising:
controlling a size and cluster spacing of the plurality of nanoparticles in each of the plurality of photonic crystal chains for color tuning.

10. The method according to claim 1 , wherein once the plurality of photonic crystal chains are hydrophobic, the plurality of photonic crystal chains are dispersed in a nonpolar solvent to create an electrically sensitive photonic crystal solution.

11. The method according to claim 10 , further comprising:
adding charge control agents and dispersants to the solution to tune behavior or sensitivity of the plurality to photonic crystal chains to a presence of an electric field or surface charge.

12. The method according to claim 1 , wherein the container is polypropylene or polycarbonate, and a static charge is built-up on the surface of the container by a triboelectric effect.

13. The method according to claim 1 , further comprising:
adding a dye or pigment into the solution, the dye or pigment configured to act as a backdrop color without attenuation or interference between a light and the plurality of photonic crystal chains.

14. The method according to claim 13 , wherein the plurality of photonic crystal chains are nanorods.

15. The method according to claim 14 , wherein the nanorods are anisotropic nanorods or pre-fixed 3D nanorod based photonic crystal chains, and packaged or encapsulated in encapsulation or solid emulsions.

16. A system for dynamic color exhibition, the system comprising:
a plurality of photonic crystal chains, each of the plurality of photonic crystal chains includes a plurality of nanoparticles;
a container, the container containing the plurality of photonic crystal chains in a solution; and
wherein the plurality of photonic crystal chains in the solution assemble and align exhibiting color in a region of a local charge build up located on or near a surface of the container.

17. The system according to claim 16 , wherein the solution is a non-polar solvent.

18. The system according to claim 16 , wherein the plurality of photonic crystal chains are sensitive to an electric charge on the surface of the container such that the plurality of photonic crystals self-assemble or align onto the surface of the container and exhibit color.

19. The system according to claim 16 , wherein the plurality of photonic crystal chains are hydrophobic silica coated nanomaterials, which retain latent charges on a surface of the hydrophobic silica coated nanomaterials when dispersed into a non-polar solvent.

20. The system according to claim 19 , wherein an electrical charge is applied through the solution or on the surface of the container, and wherein the hydrophobic silica coated nanomaterials align and self-assemble in a region of the electrical charge and exhibit color by diffraction.

21. The system according to claim 19 , wherein the hydrophobic silica coated nanomaterials are used for one or more of viewing, measuring, and sensing charge build-up on surfaces to reduce risks in an environment where electrically sensitive equipment or highly flammable fuels are used and where static discharges are dangerous.

22. The system according to claim 16 , wherein the plurality of photonic crystal chains are manipulated near a surface or in solution allowing for reflective display technologies using photonic crystal chain having an established electronic device infrastructure.

23. The system according to claim 16 , wherein the plurality of photonic crystal chains are Fe 3 O 4 nanoclusters arranged into one-dimensional (1D) chains and fixed by a coating of SiO 2 to form a linear pea-pod like structure, and the wherein the silica surface of the Fe 3 O 4 nanoclusters arranged into the one-dimensional (1D) chains are functionalized with octadecyltrimethoxysilane.

24. The system according to claim 23 , wherein a size and cluster spacing of the plurality of nanoparticles for the plurality of photonic crystal chains are controlled for color tuning.

25. The system according to claim 16 , wherein once the plurality of photonic crystal chains are hydrophobic, the plurality of photonic crystal chains are dispersed in a nonpolar solvent to create an electrically sensitive photonic crystal solution.

26. The system according to claim 25 , wherein charge control agents and dispersants are added to the solution to tune behavior or sensitivity of the plurality to photonic crystal chains to a presence of an electric field or surface charge.

27. The system according to claim 16 , wherein the container is polypropylene or polycarbonate, and a static charge is built-up on the surface of the container by a triboelectric effect.

28. The system according to claim 16 , wherein a dye or pigment is added into the solution, the

Assignees

• Univ California

Inventors

• Yin Yadong
• Davidson R Andrew

Classifications

• C30B29/16

  Oxides · CPC title

• G02F1/19

  based on variable-reflection or variable-refraction elements not provided for in groups G02F1/015 - G02F1/169 · CPC title

• C30B29/60

  characterised by shape · CPC title

• G01R29/14

  Measuring field distribution · CPC title

• G02F1/169

  based on orientable non-spherical particles having a common optical characteristic, e.g. suspended particles of reflective metal flakes · CPC title