Shape changeable material having inherent shapes using hierarchical structure and electrode having same

Patent metadata

Field	Value
Publication number	US-2017092389-A1
Application number	US-201515126822-A
Country	US
Kind code	A1
Filing date	Mar 17, 2015
Priority date	Mar 18, 2014
Publication date	Mar 30, 2017
Grant date	—

Abstract

Provided are a shape changeable material and a shape changeable electrode including the same, wherein a material having a 2-dimensional (2D) shape obtained when the material is activated by a predetermined stimulus using structural and hierarchical characteristics of the shape changeable material is provided. The shape changeable material provides a material that has various 2D inherent shapes by changing a hierarchical structure of displacement units or a joint pattern, is used as a flexible material or a stretchable material, and may be closely adhered on a curved surface without a lifting. Also, by further forming a coating layer having electric conductivity, an electrode having characteristics of the shape changeable material may be provided.

First claim

1 . A shape changeable material having:
a hierarchical structure comprising a basic displacement unit comprising a basic separation structure and basic unit cells, and a higher level displacement unit located inside the basic unit cell and comprising higher level unit cells distinguished from each other by an higher level separation structure; wherein a separation structure comprising the basic separation structure and the higher level separation structure comprises joints connecting neighboring unit cells to each other, wherein the joints have a joint pattern in which a joint shape of an outer joint contacting an outer portion of a displacement unit and an inner joint not contacting the outer portion of the displacement unit is alternately repeated; and inherent shapes resulting from hierarchical joint patterns included in higher level displacement units and the hierarchical structure, and activated by rotation movement of the basic unit cells and the higher level unit cells and relative location changes between the unit cells.

2 . The shape changeable material of claim 1 , wherein a (primary) displacement unit to (n th ) order displacement unit each comprise a separation structure independently having same or different joint patterns, and displacement units of consecutive orders each have an n th order hierarchical structure forming a hierarchical structure corresponding to the hierarchical structure of the basic displacement unit and the higher level displacement unit, wherein n is an integer equal to or higher than 2.

3 . The shape changeable material of claim 2 , wherein the (primary) displacement unit has a (primary) unit cell structure comprising a (primary) unit cell 1 to a (primary) unit cell m that are m (primary) unit cells distinguished from each other by a (primary) separation structure, wherein m is an integer of 4 or 6;
the (primary) separation structure comprises a (primary) separation part 1 to a (primary) separation part m that are m (primary) separation parts separating neighboring (primary) unit cells from each other, and comprises a (primary) joint 1 to a (primary) joint m that are m (primary) joints provided at one end of each of the (primary) separation parts, connecting neighboring (primary) unit cells to each other, and having the joint pattern, and at least one (primary) unit cell from among the m (primary) unit cells has, as a (secondary) displacement unit, a secondary or more hierarchical structure comprising a (secondary) separation structure having a same separation structure as the (primary) separation structure, and a (secondary) unit cell structure having the same separation structure as the (primary) separation structure.

4 . The shape changeable material of claim 3 , having an (n th ) order hierarchical structure comprising a (primary) displacement unit to an (n th ) order displacement unit, wherein n is an integer equal to or higher than 3,
wherein the (primary) separation structure has an alpha-type joint pattern in which the (primary) joint 1 to the (primary) joint m each have a joint shape selected from an outer joint and an inner joint, and neighboring joints in the (primary) separation structure have different joint shapes, the (secondary) separation structure has any one joint shape selected from an alpha-type joint pattern in which the (secondary) joint 1 to the (secondary) joint m have same joint shapes as the (primary) joint 1 to the (primary) joint m , and a beta-type joint pattern in which the (secondary) joint 1 to the (secondary) joint m have different joint shapes from the (primary) joint 1 to the (primary) joint m , and a (tertiary) separation structure or each of (tertiary) separation structure to (n th ) order separation structure has any one joint pattern selected from the alpha-type joint pattern and the beta-type joint pattern.

5 . The shape changeable material of claim 4 , wherein the (primary) displacement unit to (n th ) displacement unit each have a quadrangular outer line, wherein m is 4.

6 . The shape changeable material of claim 1 , wherein the unit cells and the joints comprise any one material selected from the group consisting of silicon rubber, polyester resin, hydrogel, a transition metal, carbon fiber, and a combination thereof.

7 . The shape changeable material of claim 2 , wherein the unit cells and the joints comprise any one material selected from the group consisting of silicon rubber, polyester resin, hydrogel, a transition metal, carbon fiber, and a combination thereof.

8 . The shape changeable material of claim 1 , wherein each of the joints connecting the neighboring unit cells form a hinge structure.

9 . The shape changeable material of claim 2 , wherein each of the joints connecting the neighboring unit cells form a hinge structure.

10 . A shape changeable electrode comprising:
a supporter that is the shape changeable material according to claim 1 ; and an electric conductive coating layer provided on the supporter.

11 . The shape changeable electrode of claim 10 , wherein the electric conductive coating layer comprises any one selected from the group consisting of an electric conductive metal nano-particle, carbon nano-tube, graphene, electric conductive polymer, and a combination thereof.

Assignees

• Korea Inst Sci & Tech

Inventors

• Choi Insuk
• Cho Yigil

Classifications

• F03G7/0614

  using shape memory elements · CPC title

• F03G7/0121

  Electroactive polymers · CPC title

• H01B5/14 Primary

  comprising conductive layers or films on insulating-supports · CPC title

• F03G7/00

  Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for · CPC title

• C12N5/0068

  General culture methods using substrates (for specific animal cell type C12N5/06) · CPC title