KR20230080837A - Magnetic self-assembly of pillar structure and method of fabricating the same - Google Patents

Abstract

A magnetic self-assembly pillar structure according to one aspect of the present invention includes: a substrate; a plurality of pillars including a flexible lower part, which is flexible and fixed on the substrate, and an upper part of a magnetic composite containing magnetic particles in a polymer matrix; and a fixation member coupled between at least two pillars to form at least one assembled pair fixed on the substrate when at least two adjacent pillars among the plurality of pillars are in contact with at least their upper ends by external magnetic force. Thus, the present invention can provide the magnetic self-assembly pillar structure capable of self-assembly and the manufacturing method thereof.

Description

Magnetic self-assembly of pillar structure and method of fabricating the same}

The present invention relates to micro/nano devices, and more particularly to a magnetic self-assembly pillar structure and a manufacturing method thereof.

Micro/nano technology using micro/nano particles or micro/nano protrusions is used to improve optical properties and surface properties of objects. For example, surface wetting characteristics or visual characteristics may be changed by changing the density or shape of the surface protrusion structure of the object. The surface structure of the object may be formed using a micro/nano etching technique or a MEMS manufacturing technique. However, this surface shape is dependent on the manufacturing process, so it is not easy to change the surface shape as needed.

International Application No. PCT/US2006/023722 (2006.06. 19)

The present invention is to solve the above problems, and an object of the present invention is to provide a magnetic self-assembly pillar structure capable of self-assembly and a manufacturing method thereof. However, these tasks are illustrative, and the scope of the present invention is not limited thereby.

A magnetic self-assembly pillar structure according to one aspect of the present invention for solving the above problems includes a substrate, a lower portion having flexibility, and an upper portion of a magnetic composite in which magnetic particles are contained in a polymer matrix, wherein the lower portion is the substrate A plurality of pillars, which are flexible and fixed on the substrate, and at least two adjacent pillars among the plurality of pillars form at least one assembly pair fixed on the substrate in a state in which at least the upper ends are in contact with each other by an external magnetic force. and a fixing member coupled between the at least two pillars.

According to the magnetic self-assembled pillar structure, the lower part of the plurality of pillars may be formed of the same material as the polymer matrix of the upper part, and the lower part may be integrally formed of the same material as the substrate.

According to the magnetic self-assembled pillar structure, the fixing member may be formed by evaporating a solvent after supplying a polymer solution to the substrate in a state in which upper ends of the at least two pillars are in contact with each other.

According to the magnetic self-assembly pillar structure, the at least two pillars include at least four pillars disposed adjacently in a direction different from the direction of the external magnetic force and forming at least one assembled pair, and the fixing member comprises the at least one pillar. A vertical portion disposed between the pair of assembling pairs may be further included, and the at least one pair of assembling pairs may be fixed by capillary force of the vertical portion of the fixing member in a state in which upper ends thereof are in contact with each other.

According to the magnetic self-assembly pillar structure, the plurality of pillars include first pillars containing the magnetic particles in a first concentration and second pillars containing the magnetic particles in a second concentration higher than the first concentration. and the first pillars or the second pillars may selectively form the assembled pair according to the strength of the external magnetic force.

A method of manufacturing a magnetic self-assembly pillar structure according to another aspect of the present invention for solving the above problems includes filling magnetic particles in a mold having a plurality of grooves, and filling and curing a polymer precursor in the plurality of grooves. forming a plurality of pillars including a flexible lower part and an upper part of the magnetic composite in which the magnetic particles are contained in a polymer matrix, and wherein the lower part has flexibility and is fixed on a substrate; and coupling a fixing member between at least two adjacent pillars to form at least one assembled pair fixed on the substrate in a state in which at least two adjacent pillars are in contact with each other by an external magnetic force.

According to the manufacturing method of the magnetic self-assembly pillar structure, in the forming of the plurality of pillars, at least upper ends of the plurality of grooves may be filled with the polymer cursor and cured to form the lower portions of the plurality of pillars. there is.

According to the manufacturing method of the magnetic self-assembly pillar structure, the filling of the magnetic particles may include arranging a magnet under the mold so that the magnetic particles fill the plurality of grooves.

According to the manufacturing method of the magnetic self-assembled pillar structure, in the step of coupling the fixing member, the fixing member supplies a polymer solution onto the substrate in a state in which upper ends of the at least two pillars are in contact with each other, and then evaporates the solvent. can be formed

According to the manufacturing method of the magnetic self-assembly pillar structure, the at least two pillars include at least four pillars arranged adjacently in a direction different from the direction of the external magnetic force and forming at least one assembly pair, and the fixing member further comprises a vertical portion disposed between the at least one pair of assembling pairs, and the at least one pair of assembling pairs are fixed by capillary force of the vertical portion of the fixing member in a state in which upper ends thereof are in contact with each other. can

According to the manufacturing method of the magnetic self-assembly pillar structure, the plurality of pillars include first pillars containing the magnetic particles in a first concentration and second pillars containing the magnetic particles in a second concentration higher than the first concentration. It includes two pillars, and the first pillars or the second pillars may selectively form the assembled pair according to the strength of the external magnetic force.

According to the magnetic self-assembly pillar structure and manufacturing method thereof according to an embodiment of the present invention made as described above, it is possible to provide a self-assembled pillar structure whose surface characteristics can be changed using magnetic force.

Of course, these effects are exemplary, and the scope of the present invention is not limited by these effects.

1A to 1F are schematic diagrams showing a magnetic self-assembly pillar structure and a manufacturing method thereof according to a first embodiment of the present invention.
2A to 2D are schematic diagrams showing a magnetic self-assembly pillar structure and a manufacturing method thereof according to a second embodiment of the present invention.
3A to 3D are schematic diagrams showing a magnetic self-assembly pillar structure and a manufacturing method thereof according to a third embodiment of the present invention.
4A to 4D are schematic diagrams showing a magnetic self-assembly pillar structure and a manufacturing method thereof according to a fourth embodiment of the present invention.
5 is a plan view showing a magnetic self-assembly pillar structure according to a fifth embodiment of the present invention.
6 is a plan view showing a magnetic self-assembly pillar structure according to a sixth embodiment of the present invention.
7 is a schematic diagram showing a magnetic self-assembly pillar structure according to a seventh embodiment of the present invention.
8A and 8B are schematic diagrams showing changes in the surface shape of the magnetic self-assembly pillar structure of FIG. 7 according to the strength of the magnetic force.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. It is provided to fully inform you. Also, for convenience of explanation, the size of at least some components may be exaggerated or reduced in the drawings. Like symbols in the drawings refer to like elements.

Unless defined otherwise, all terms used herein are used with the same meaning as commonly understood by one of ordinary skill in the art. In the drawings, the sizes of layers and regions are exaggerated for illustrative purposes and are therefore provided to illustrate the general structures of the present invention.

Like reference numerals denote like elements. It will be understood that when one element, such as a layer, region, or substrate, is referred to as being on another element, it may be directly on top of or intervening elements may also exist. On the other hand, when referring to a component being “directly on” another component, it is understood that there are no intervening components present.

1A to 1F are schematic diagrams showing a magnetic self-assembly pillar structure and a manufacturing method thereof according to a first embodiment of the present invention.

Referring to FIG. 1A , magnetic particles 70 may be filled in a mold 60 having a plurality of grooves 62 . For example, grooves 62 may be formed in a negative shape in the mold 60 to have an array arrangement. The grooves 62 may have a micro size. Mold 60 may be a magnetically inert material.

For example, the magnetic particles 70 may fill up the grooves 62 and partially remove them, or partially fill the grooves 62 so that the upper ends of the grooves 62 are exposed. For example, the magnetic particles 70 may fill a range of 60 to 90% of each groove 62 at a high concentration. The magnetic particles 70 may include particles of a ferromagnetic material, such as iron particles.

In some embodiments, in the step of filling the grooves 62 with the magnetic particles 70, a magnet 50 capable of applying an external magnetic force may be disposed below the mold 60. The magnetic particles 70 in the grooves 62 may be densely filled in the grooves 62 while being attracted downward by the magnetic force.

Referring to FIG. 1B , the polymer precursor 80 may be filled and cured in the grooves 62 filled with the magnetic particles 70 .

In some embodiments, when the grooves 62 are almost completely filled with the magnetic particles 70, the magnetic particles 70 at the upper ends of the grooves 62 are partially removed so that the upper portions of the grooves 62 are exposed. After that, the polymer precursor 80 may be filled in the grooves 62 . Accordingly, the polymer precursor 80 may be filled between the magnetic particles 70 at least in the lower portion of the grooves 62 , and the polymer precursor 80 may be filled in at least the upper portion of the grooves 62 .

Referring to FIG. 1C , a plurality of pillars 110 having lower portions 112 having flexibility and being fixed may be formed on a substrate 105 by being separated from the mold 60 . When the grooves 62 have a micro size, the pillars 110 may have a micro size.

More specifically, the pillars 110 may include a flexible lower portion 112 and a magnetic composite upper portion 114 . For example, the lower portion 112 may be flexible and fixed to the substrate 105 , and the upper portion 114 may include a magnetic composite in which magnetic particles 70 are contained in a polymer matrix 85 . Accordingly, the upper ends of the pillars 110 may be elastically moved by an external magnetic force while the ends of the lower portions 112 are fixed to the substrate 105 .

For example, the lower portion 112 of the pillars 110 may be the same material as the polymer matrix 85 of the upper portion 114 . Furthermore, the lower portion 112 may be integrally formed of the same material as the substrate 105 . More specifically, as described in FIG. 1B , the substrate 105 and the pillars 110 may be integrally formed by filling the polymer precursor 80 in the grooves 62 and then curing the polymer precursor 80 . At least upper ends of the grooves 62 may be filled with a polymer precursor 80 and cured to form lower portions 112 of the pillars 110 . Accordingly, since the material of the substrate 105 and the polymer matrix 85 in the pillars 110 are formed of the same material, the manufacturing process can be simplified.

In a modified example of this embodiment, it is also possible to form the substrate 105 and the pillars 110 with different materials.

Referring to FIG. 1D , at least two adjacent pillars 110 among the pillars 110 may be brought into contact with at least upper ends by an external magnetic force. The direction of the external magnetic force may be parallel to the substrate 105 . For example, an external magnetic force may be added by permanent magnets. Since the lower portions 112 of the pillars 110 are flexibly fixed to the substrate 105 and the upper portions 114 of the pillars 110 include a magnetic composite, the pillars 110 have lower ends of the substrate. In a state fixed to (105), the upper ends of the magnetic complexes may be bent so as to come into contact with each other due to the attractive force of the magnetic complexes.

More specifically, when an external magnetic force is applied, each of the pillars 110 may function as a micro magnet. Accordingly, the magnetic polarities of the magnetic particles 70 in the pillars 110 may be aligned in the direction of the external magnetic force. Accordingly, the upper portion 114 of the pillars 110 may form a magnetic dipole according to the direction of the external magnetic force. Since the magnetic dipoles of the closest pillars 110 have polarities to each other, they can be attracted to each other by attraction. Accordingly, the upper ends of the upper portions 114 of the pillars 110 may be in contact with each other.

Referring to FIGS. 1E and 1F , a magnetic self-assembly pillar structure 100 is formed by coupling a fixing member 122 between the at least two pillars to form at least one assembly pair fixed on a substrate 105. can form

For example, as shown in FIG. 1E , at least two adjacent pillars 110 among the pillars 110 apply the polymer solution 120 on the substrate 105 in a state in which at least the upper ends are in contact with each other by an external magnetic force. can supply

Subsequently, as shown in FIG. 1F, at least one assembly pair in which the solvent is evaporated from the polymer solution 120 and the adjacent at least two pillars 110 are fixed on the substrate 105 in a state in which at least the upper ends are in contact with each other. The fixing member 122 may be formed to form 115 . For example, the fixing member 122 may be a polymer solute remaining after a solvent is evaporated from the polymer solution 120 .

For example, if the polymer solution 120 is entirely sprayed on the substrate 105 and then the solvent is evaporated, a plurality of assembled pairs 115 may be formed on the substrate 105 .

Accordingly, even if the external magnetic force disappears, the upper ends of the two pillars 110 in the assembled pair 115 may be fixed in a state of being in contact with each other. Thus, a magnetic self-assembly pillar structure 100 capable of magnetic arrangement using magnetic force can be formed.

In the above-described polymer precursor 80, polymer matrix 85 or polymer solution, the polymer material is from the group consisting of silicone rubber, urethane, olefin, styrene, epoxy, sulfur, imide, amide and ester It may be a polymer containing at least one selected thermoplastic polymer or thermosetting polymer.

For example, the thermoplastic polymer includes a thermoplastic styrene block copolymer, a thermoplastic polyolefinelastomer (TPO), a thermoplastic polyurethane (TPU), and a thermoplastic polyamide (TPA). , thermoplastic polyethylene (TPE), thermoplastic vulcanizate (TPV), or a copolymer of monomers constituting them.

In addition, the thermosetting polymer is acrylonitrile butadiene rubber, chlorosulfonated polyethylene rubber, ethylene acrylate rubber, fluorocarbon rubber, hydrogenated acrylic Hydrogenated acrylonitrile butadiene rubber, perfluoroelastomer, thermoset polyurethane rubber, thermoset styrene butadiene rubber, thermoset chloroprene rubber, Epichlorohydrin copolymer rubber, ethylene propylene diene rubber, fluorosilicone rubber, natural rubber polyisoprene rubber, polyacrylate rubber ), or silicone rubber.

In the experimental example of FIG. 1F, a polydimethylsiloxane (PDMS) polymer was used as the polymer precursor 80 or the polymer matrix 85.

The magnetic self-assembly pillar structure 100 according to an embodiment of the present invention may include a substrate 105 , pillars 110 on the substrate 105 , and fixing members 122 .

For example, the pillars 110 may include a lower portion 112 having flexibility and an upper portion 114 of a magnetic composite in which magnetic particles 70 are contained in a polymer matrix 85 . The fixing member 122 forms at least one assembly pair 115 in which at least two adjacent pillars 110 among the pillars 110 are fixed on the substrate 105 in a state in which at least the upper ends are in contact with each other by an external magnetic force. It may be coupled between at least two pillars 110 to do so.

2A to 2D are schematic diagrams showing a magnetic self-assembly pillar structure and a manufacturing method thereof according to a second embodiment of the present invention. Since the magnetic self-assembly pillar structure 100a according to this embodiment is obtained by adding or modifying some components of the magnetic self-assembly pillar structure 100 of FIGS. 1A to 1F , the two embodiments can be referred to each other and thus Redundant descriptions are omitted.

Referring to FIGS. 2A and 2B , in a state in which the pillars 110 are formed, a magnetic force (B=0.6T) is applied to bring the upper ends of the two pillars 110 into contact, and a polymer between the pillars 110 is applied. A solution 120 may be supplied.

The pillars 110 may have a rectangular shape having a major axis and a minor axis when viewed from a plane. For example, a major axis may be disposed in the x-axis direction and a minor axis may be disposed in the y-axis direction. The magnetic force may be applied in an x-axis direction, which is a long axis direction.

For example, the upper ends of the two pillars 110 are brought into contact by applying a magnetic force, or the upper ends of the two pillars 110 by applying a magnetic force while the polymer solution 120 is supplied on the substrate 105. may be brought into contact.

In some embodiments, the pillars 110 may include at least four pillars 110 disposed adjacent to each other in a direction different from the direction of the external magnetic force, for example, in a vertical direction, and forming at least one assembled pair 115. can

For example, the pillars 110 may form assembly pairs 115 such that upper ends come into contact with each other along the x-axis direction. Furthermore, the assembled pairs 115 of one row and the assembled pairs 115 of another row adjacent to each other may be staggered. It may be related to the anisotropic quadrupolar interaction of the magnetic energy disposed of these assembly pairs 115.

Referring to FIGS. 2C and 2D , the fixing member 122 may be formed by evaporating the solvent from the polymer solution 120 . As the solvent evaporates, the upper ends of the assembled pairs 115 formed by the pillars 110 arranged in the x-axis direction are fixed to be in contact with each other even if the external magnetic force is removed by the fixing member 122 therebetween. can

Furthermore, the fixing member 122 may further include a vertical portion disposed between the at least one pair of assembling pairs 115 disposed adjacent to each other in a direction different from the direction of the external magnetic force, for example, in a vertical direction. The at least one pair of assembling pairs 115 may be fixed by the capillary force of the vertical portion of the fixing member 122 in a state in which upper ends are in contact with each other.

For example, as shown in FIG. 2C, one assembly pair 115 disposed in one row is adjacent to two assembly pairs 115 disposed in another row, and the fixing member 122 such that the upper end thereof is in contact with each other. ) can be fixed by The attractive force between the assembly pairs 115 in the y-axis direction or in the direction perpendicular to the external magnetic force may be due to the lateral capillary force of the fixing member 122 .

3A to 3D are schematic diagrams showing a magnetic self-assembly pillar structure and a manufacturing method thereof according to a third embodiment of the present invention. The magnetic self-assembly pillar structure 100b according to this embodiment has some components in the magnetic self-assembly pillar structure 100 of FIGS. 1A to 1F and the magnetic self-assembly pillar structure 100a of FIGS. 2A to 2D. Since it is an addition or modification, the embodiments can be referred to each other, and thus redundant descriptions are omitted.

Referring to FIG. 3A , the long axes of the pillars 110 may be disposed at a predetermined angle with respect to the x-axis to which an external magnetic force is applied. For example, the predetermined angle may be 45 degrees. In this case, the external magnetic force may be divided into a force in a major axis direction and a force in a minor axis direction.

When the external magnetic force is weak (B=0.05T), since the pillars 110 are arranged more closely along the long axis direction than the short axis direction, the attractive force between the two pillars 110 arranged adjacently along the long axis direction is may have a greater effect.

Referring to FIG. 3B, as the external magnetic force increases (B = 0.17T), pillar pairs 115 are formed so that the upper ends of at least two pillars 110 disposed adjacent to each other along the long axis come into contact, and furthermore, Upper ends of at least one pair of pillar pairs 115 disposed along the minor axis direction may contact each other. Accordingly, twisting force may be applied to the pillar pairs 115 .

Referring to FIG. 3C , as the external magnetic force increases (B=0.38T), the upper ends of the pillar pairs 115 adjacent in the direction of the external magnetic force (ie, the x-axis direction) among the pillar pairs 115 contact each other. It can be. Accordingly, by the contact of the pillar pairs 115, the pillars 110 may be bent so that their upper ends come into contact with each other almost parallel to the direction of the external magnetic field.

Referring to FIG. 3D , even if the external magnetic field is removed, the magnetic self-assembly pillar structure 100b is self-assembled and fixed so that the upper ends of the pillars 110 come into contact almost along the x-axis direction through the fixing member 122. ) can be formed.

4A to 4D are schematic diagrams showing a magnetic self-assembly pillar structure and a manufacturing method thereof according to a fourth embodiment of the present invention. Since the magnetic self-assembly pillar structure 100c according to this embodiment is obtained by adding or modifying some components of the above-described magnetic self-assembly pillar structures 100, 100a, and 100b, the embodiments may be referred to each other and thus overlapping. description is omitted.

Referring to FIG. 4A, the pillars 110 have their long axes in a direction perpendicular to the x-axis to which an external magnetic force is applied, that is, in the y-axis direction, and their short axes in a direction parallel to the external magnetic force, that is, in the x-axis direction. can be placed.

When the external magnetic force is weak (B=0.05T), the attractive force may act preferentially between the two pillars 110 disposed adjacently along the direction of the external magnetic force.

Referring to FIG. 4B, as the external magnetic force increases (B = 0.14T), pillar pairs 115 are formed so that the upper ends of at least two pillars 110 disposed adjacently along the x-axis come into contact, Furthermore, twist attraction may be applied between at least one pair of pillar pairs 115 disposed in adjacent rows.

Referring to FIG. 4C , as the external magnetic force becomes larger (B=0.44T), the upper ends of the three relatively adjacent pillar pairs 115 may come into contact with each other. Accordingly, due to the contact between the pillar pairs 115, the pillars 110 may be bent to have a wave pattern in the direction of the external magnetic field in a macroscopic view.

Referring to FIG. 4D, even if the external magnetic field is removed, the magnetic self-assembly assembly structure ( 100c) may be formed.

5 is a plan view showing a magnetic self-assembly pillar structure according to a fifth embodiment of the present invention. Since the magnetic self-assembly pillar structure 100d according to this embodiment is obtained by adding or modifying some components of the above-described magnetic self-assembly pillar structures 100, 100a, 100b, and 100c, the embodiments may be referred to each other. and therefore redundant descriptions are omitted.

Referring to FIG. 5 , the pillars 110 may have a square shape when viewed from a plan view.

When an external magnetic force is applied in the x-axis direction, pillars 110 adjacent to each other in the x-axis direction form assembled pairs 115, and then three adjacent assembled pairs 115 in two rows contact each other to form a wave pattern. can form Thereafter, even if the external magnetic force is removed, the magnetic self-assembled pair assembly structure 100d having a wave pattern in which the assembled pairs 115 are substantially extended in the x-axis direction can be formed by the fixing member 122 .

6 is a plan view showing a magnetic self-assembly pillar structure according to a sixth embodiment of the present invention. Since the magnetic self-assembly pillar structure 100e according to this embodiment is obtained by adding or modifying some components of the above-described magnetic self-assembly pillar structures 100, 100a, 100b, 100c, and 100d, the embodiments refer to each other. may be, and therefore, redundant descriptions are omitted.

Referring to FIG. 6 , the pillars 110 may have a circular shape when viewed from a plan view.

When an external magnetic force is applied in the x-axis direction, pillars 110 adjacent to each other in the x-axis direction form assembled pairs 115, and then three adjacent assembled pairs 115 in two rows contact each other to form a wave pattern. can form Then, even if the external magnetic force is removed, the magnetic self-assembled pair assembly structure 100e having a wave pattern in which the assembled pairs 115 are substantially extended in the x-axis direction can be formed by the fixing member 122 .

In the above-described magnetic self-assembly pillar structures 100, 100a, 100b, 100c, 100d, and 100e, it is known that the self-assembly characteristics due to external magnetic force are changed by changing the geometric shape or the arrangement direction of the pillars 110. can

7 is a schematic diagram showing a magnetic self-assembly pillar structure 100f according to a seventh embodiment of the present invention. The magnetic self-assembly pillar structure 100f according to this embodiment is obtained by adding or modifying some components of the magnetic self-assembly pillar structures 100, 100a, 100b, 100c, 100d, and 100e described above. They may be referred to each other, and thus redundant descriptions are omitted.

Referring to FIG. 7 , the magnetic self-assembly pillar structure 100f includes first pillars 110a containing magnetic particles 70 in a first concentration and magnetic particles 70 in a second concentration. It may include second pillars 110b.

The first concentration and the second concentration may be different from each other, and thus, the first pillars 110a or the second pillars 110b may selectively form an assembled pair 115 according to the strength of the external magnetic force. .

For example, the second concentration may be higher than the first concentration. Accordingly, the first upper portions 114a of the first pillars 110a are composed of a magnetic composite including magnetic particles 70 having a relatively low first concentration, and the second upper portions 114a of the second pillars 110b are formed. The upper portion 114b may be composed of a magnetic composite including a relatively high second concentration of magnetic particles 70 .

In this case, when the external magnetic force is applied, the second pillars 110b having a higher concentration of magnetic particles 70 are more resistant to the external magnetic force than the first pillars 110a having a lower concentration of magnetic particles 70. You can react first. That is, as shown in FIG. 7 , the second pillars 110b may contact each other, but the first pillars 110a may not contact each other. Twisting force may not act on the first pillars 110a because of the first concentration of magnetic particles arranged in parallel with the direction of the external magnetic force.

The second pillars 110b may be arranged in a specific shape. In this case, if there is no or small external magnetic force, the specific shape does not appear, but if the external magnetic force increases to a predetermined size, the first pillars 110a do not move. While the upper ends of the second pillars 110b are in contact with each other, a specific shape may visually appear.

8A and 8B are schematic diagrams showing changes in the surface shape of the magnetic self-assembly pillar structure of FIG. 7 according to the strength of the magnetic force.

As shown in FIG. 8A, when the external magnetic force is low (B = 0.05T), a specific shape does not appear, but as shown in FIG. 8B, when the external magnetic force is greater than a predetermined size (B = 0.6T), the second pillar When the upper ends of the pillars 110b come into contact with each other, a specific shape of the second pillars 110b, for example, a specific letter shape, may appear.

In the magnetic self-assembling assembly structure 100f, the first pillars 110a and the second pillars 110b are formed of the mold 60 in the step of filling the mold 60 with the magnetic particles 70 of FIG. 1A. The grooves 62 are filled with magnetic particles 70 at a first concentration, a masking film having a specific shape is placed on the mold 60, and among the grooves 62, grooves arranged in a specific shape exposed by the masking film ( 62) are further filled with magnetic particles 70 to a second concentration, and then, as shown in FIG. 1B, a polymer precursor 80 is filled and cured. After removing the masking film, the magnetic particles 70 are filled with the first concentration in the grooves 62 that were not previously exposed, and an external magnetic force is applied in a direction forming an angle of 45 degrees with the long axis of the rectangular cross section so that the magnetic particles ( 70) is filled and cured once more with the polymer precursor 80 arranged in the long axis direction. Thereafter, by separating from the mold 60, pillars having a specific letter shape as shown in FIG. 8B may be formed.

The aforementioned magnetic self-assembly pillar structures 100, 100a, 100b, 100c, 100d, 100e, and 100f may be used to change surface properties using self-assembly properties, such as surface modification and surface optical property change. For example, the magnetic self-assembly pillar structures 100, 100a, 100b, 100c, 100d, 100e, and 100f may vary the degree of self-assembly according to the strength of an external magnetic force, thereby varying surface roughness or density of surface protrusions. Therefore, the surface contact angle characteristics may be changed. As another example, the magnetic self-assembly pillar structures 100, 100a, 100b, 100c, 100d, 100e, and 100f are visualized to have a specific shape by varying the concentration of the magnetic particles 70 and applying an external magnetic field. Characteristics may change. Accordingly, the magnetic self-assembly pillar structures 100, 100a, 100b, 100c, 100d, 100e, and 100f may be coupled to the surface of the object and used to change the surface characteristics of the object.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100, 100a, 100b, 100c, 100d, 100e, 100f: magnetic self-assembly assembly structures
70: magnetic particles
80: polymer precursor
105: substrate
110: Pillar
115: assembled pair
120: polymer solution
122: fastening member

Claims (11)

Board;
a plurality of pillars including a lower portion having flexibility and an upper portion of a magnetic composite in which magnetic particles are contained in a polymer matrix, the lower portion having flexibility and being fixed on the substrate; and
A fixing member coupled between at least two pillars of the plurality of pillars to form at least one assembled pair fixed on the substrate in a state in which at least two pillars are in contact with each other by external magnetic force. ,
Magnetic self-assembly pillar structure. According to claim 1,
The lower part of the plurality of pillars is the same material as the polymer matrix of the upper part,
The lower part is integrally formed of the same material as the substrate,
Magnetic self-assembly pillar structure. According to claim 1,
The fixing member is formed by evaporating a solvent after supplying a polymer solution on the substrate in a state in which the upper ends of the at least two pillars are in contact.
Magnetic self-assembly pillar structure. According to claim 3,
The at least two pillars include at least four pillars disposed adjacently in a direction different from the direction of the external magnetic force and forming at least one assembled pair,
the fixing member further comprises a vertical portion disposed between the at least one pair of assembled pairs;
The at least one pair of assembled pairs are fixed by the capillary force of the vertical portion of the fixing member with their upper ends in contact with each other.
Magnetic self-assembly pillar structure. According to claim 1,
The plurality of pillars include first pillars containing the magnetic particles in a first concentration and second pillars containing the magnetic particles in a second concentration higher than the first concentration;
The first pillars or the second pillars selectively form the assembled pair according to the strength of the external magnetic force.
Magnetic self-assembly pillar structure. filling magnetic particles in a mold having a plurality of grooves;
After filling and curing the polymer precursor in the plurality of grooves and separating from the mold, a flexible lower part and an upper part of the magnetic composite in which the magnetic particles are contained in a polymer base are included, and the lower part has flexibility on the substrate. Forming a plurality of pillars that are fixed; and
coupling a fixing member between at least two adjacent pillars of the plurality of pillars to form at least one assembled pair fixed on the substrate in a state in which at least two adjacent pillars are in contact with each other by an external magnetic force; including,
A method of manufacturing a magnetic self-assembly pillar structure. According to claim 6,
In the forming of the plurality of pillars, at least upper ends of the plurality of grooves are filled with the polymer precursor and cured to form the lower portions of the plurality of pillars.
A method of manufacturing a magnetic self-assembly pillar structure. According to claim 6,
In the step of filling the magnetic particles, arranging a magnet under the mold so that the magnetic particles are filled in the plurality of grooves,
A method of manufacturing a magnetic self-assembly pillar structure. According to claim 7,
In the step of coupling the fixing member, the fixing member is formed by evaporating the solvent after supplying a polymer solution onto the substrate in a state in which the upper ends of the at least two pillars are in contact.
A method of manufacturing a magnetic self-assembly pillar structure. According to claim 9,
The at least two pillars include at least four pillars disposed adjacently in a direction different from the direction of the external magnetic force and forming at least one assembled pair,
the fixing member further comprises a vertical portion disposed between the at least one pair of assembled pairs;
The method of manufacturing a magnetic self-assembly pillar structure, wherein the at least one pair of assembling pairs are fixed by capillary force of the vertical portion of the fixing member in a state in which upper ends are in contact with each other. According to claim 6,
The plurality of pillars include first pillars containing the magnetic particles in a first concentration and second pillars containing the magnetic particles in a second concentration higher than the first concentration;
The first pillars or the second pillars selectively form the assembled pair according to the strength of the external magnetic force.
A method of manufacturing a magnetic self-assembly pillar structure.

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