KR20190108944A - Polymer-magnetic particle composite protrusions capable of local selective deformation attached on a non-magnetic substrate - Google Patents

Abstract

The present invention relates to a magnetic polymer composite material structure and, more specifically, provides the magnetic polymer composite material structure wherein one or more protrusions composed of a magnetic polymer composite in which a magnetic particle is disposed in a polymer is physically or chemically attached to a substrate such that the protrusion is sensitive to an external magnetic field to allow local selective modification.

Description

Polymer-magnetic particle composite protrusions capable of local selective deformation attached on a non-magnetic substrate}

The present invention relates to a polymer-magnetic particle composite protrusion, and more particularly, to a structure having a protrusion attached to a polymer composite material reacting to a magnetic field by dispersing magnetic particles reacting to a magnetic field in a polymer.

Recently, a fine protrusion structure capable of being driven by a magnetic field has been developed. Such a micro-projection structure can be used for the purpose of actuators, switches, fluid pumps, antennas, pumps, etc. As a simple structure instead of a conventional complex motor can be implemented as a drive device used in the microstructure. It is getting attention.

In this regard, the Republic of Korea Patent No. 10-1805776 discloses an active antifouling film designed to move the magnetic filler in accordance with the direction of the magnetic field because the magnetic fillers of the cilia form are arranged in an array form on the substrate. 264959 discloses a deformable micro or nanostructure having a plurality of protrusions comprising a magnetic material placed on a substrate made of an elastic material and having the property of moving the protrusions by a magnetic field.

Korea Patent No. 10-1805776 Active antifouling film, manufacturing method of the vinyl house tent and active antifouling film using the same Japanese Patent Laid-Open No. 2008-264959 Deformable micro nano structure

Drotlef et al., Advanced Materials, 2014, 26, 775-779

However, the structure including the projections made of a material capable of reacting to the magnetic field developed to date, including the above-mentioned prior literatures are made of a metal material can implement only a simple mode, due to the characteristics of the metal such as bending or twisting- It is not possible to realize the shape change of the response, and even if it is composed of a polymer-magnetic particle composite material, only a simple bending mode is implemented.

Therefore, there is an urgent need for the development of a structure including a protrusion capable of implementing various self-sensitive shape changes.

Accordingly, the present invention is to solve a number of problems, including the above-described problems, the complex of the polymer-magnetic particles that can change the physical properties of the composite material by controlling the content, orientation, etc. of the magnetic particles in the composite material, unlike the metal It aims to provide material. However, these problems are exemplary, and the scope of the present invention is not limited thereby.

According to one aspect of the invention, one or more projections consisting of a magnetic polymer composite in which magnetic particles are disposed in a polymer is physically or chemically attached to a substrate, the magnetic polymer composite capable of local selective deformation in response to an external magnetic field Material structures are provided.

According to another aspect of the invention, preparing a magnetic polymer protrusion by placing the magnetic particles in the polymer; And

Provided is a method of manufacturing the magnetic polymer composite structure comprising physically or chemically attaching the magnetic polymer protrusion onto a substrate.

According to another aspect of the invention, there is provided a method for locally selective deformation of the magnetic polymer projections in the magnetic polymer composite structure, comprising applying an external magnetic field in a predetermined direction to the magnetic polymer composite structure. .

According to another aspect of the present invention, a conductor is inserted into the protrusion in a magnetic polymer composite structure including the magnetic particles physically or chemically attached to the substrate by one or more protrusions composed of a magnetic polymer composite in which the magnetic particles are disposed in the polymer. Or attached, to adjust the direction in which electricity flows by adjusting the self-sensing direction of the protrusions.

According to one embodiment of the present invention made as described above, it is possible to implement a polymer composite structure that can locally deform the projections by an external magnetic field. Because of the above characteristics, the polymer composite structure according to the embodiment of the present invention can be utilized for various purposes such as an actuator, a switch, an electrode, a fluid pump, an antenna, and a pump for a microstructure. However, these effects are exemplary, and the scope of the present invention is not limited thereby.

1 is a schematic diagram schematically showing a projection composed of a polymer-magnetic particle composite material according to an embodiment of the present invention.
FIG. 2 is a schematic diagram schematically showing a polymer composite structure according to an embodiment of the present invention, in which a plurality of protrusions illustrated in FIG. 1 are fixed on a substrate.
FIG. 3 is a schematic diagram schematically illustrating various arrangement directions (upper) of magnetic particles in a magnetic polymer protrusion and a self-sensitive deformation behavior of the protrusion (bottom) according to an embodiment of the present invention.
FIG. 4 is a series of photographs (top) of the projections shown in FIG. 3 taken by a scanning electron microscope, and a series of photographs (bottom) of self-sensitization behavior of these projections.
FIG. 5 is a graph (top) and a graph of measuring the degree of self-response of the magnetic polymer protrusions according to the strength of the magnetic field (torsion angel, left), bending angle (center), and the twist angle for 100 cycles. (Left) and a bending angle (center) are recorded and shown, and the right side is a graph which superimposed the said twisting angle and the bending angle.
HLA: perpendicular to the direction of the magnetic field used for self-sensitive behavior, arranged in a direction parallel to the substrate;
VA: perpendicular to the direction of the magnetic field used for self-sensitive behavior, also arranged perpendicular to the substrate
FIG. 6 is a sample image of magnets in which magnetic particles are arranged and five kinds of self-sensitive behaviors in one sample.
Figure 7 is a substrate showing the letter "INHA" as a projection showing the non-responsive self-responsive behavior to the magnetic field in order from the left, the substrate having a projection showing the distortion behavior in response to the magnetic field, uniform bending behavior It is a series of photographs taken before the magnetic field application (upper) and after the magnetic field application (lower) for the substrate arranged with the projection showing the twisting and the substrate showing the twisting behavior.
8 is a schematic diagram schematically illustrating an electrode structure capable of adjusting a direction in which electricity flows by changing a direction in which electricity flows due to a change in the direction of self-sensitization behavior of the protrusion according to a pole change of an external magnetic field.

Detailed description of the invention:

According to one aspect of the invention, one or more projections consisting of a magnetic polymer composite in which magnetic particles are disposed in a polymer is physically or chemically attached to a substrate, the magnetic polymer composite capable of local selective deformation in response to an external magnetic field Material structures are provided.

In the magnetic polymer composite material structure, the polymer may be any one or more of thermoplastic polymers or thermosetting polymers selected from the group consisting of urethane, olefin, styrene, epoxy, sulfur, imide, amide and ester. It may be a polymer comprising, the thermoplastic polymer is more specifically a thermoplastic styrene block copolymer (thermoplastic styrene block copolymer), thermoplastic polyolefinelastomer (TPO), thermoplastic polyurethane (TPU), thermoplastic poly Amide (thermoplastic polyamide, TPA), thermoplastic polyethylene (TPE), thermoplastic vulcanizate (TPV) and copolymers of the constituents thereof, and the thermosetting polymer is acrylonitrile butadiene rubber ( acrylonitrile b utadiene rubber, chlorosulfonated polyethylene rubber, ethylene acrylated rubber, fluorocarbon rubber, hydrogenated acrylonitrile butadiene rubber, perfluoro 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 commercial magnetic polymer composite structure, the magnetic particles may be ferromagnetic particles or ferrimagnetic particles, and the ferromagnetic particles may be cobalt, nickel, iron, neodymium, oxides thereof, or alloys thereof. Magnetic particles comprising at least one ferromagnetic material selected from the group consisting of, wherein the Chinese magnetic particles may be magnetic particles comprising a magnetite, and a Chinese magnetic material selected from the group consisting of ferrite.

In the magnetic polymer composite structure, the substrate may be a magnetic substrate or a non-magnetic substrate, the material may be a metal, ceramic, semiconductor, thermosetting polymer or thermosetting polymer or a composite material of any two or more thereof.

In the magnetic polymer composite structure, the arrangement of the magnetic particles may be determined according to the desired behavior characteristics. For example, when the magnetic particles are randomly dispersed in the projections, they exhibit non-uniform bending behavior, and when they are arranged in the same direction as the direction of the magnetic field used for the magnetic-sensitive behavior, they show no response. When the direction is perpendicular to the direction of the magnetic field to be used and is arranged in a direction parallel to the substrate, it exhibits warping behavior, is perpendicular to the direction of the magnetic field used for the self-sensitization behavior, and is also perpendicular to the substrate. In this case, it shows uniform bending behavior, and when it is arranged in a direction perpendicular to the direction of the magnetic field used for the self-sensitized behavior, except in a plane parallel to and perpendicular to the substrate (see FIG. 3). .

According to another aspect of the invention, preparing a magnetic polymer protrusion by placing the magnetic particles in the polymer; And

Provided is a method of manufacturing the magnetic polymer composite structure comprising physically or chemically attaching the magnetic polymer protrusion onto a substrate.

In the above production method, the polymer is a polymer containing any one or more of a thermoplastic polymer or a thermosetting polymer selected from the group consisting of urethane-based, olefin-based, styrene-based, epoxy-based, sulfur-based, imide-based, amide-based and ester-based The thermoplastic polymer may be, in more detail, a thermoplastic styrene block copolymer, a thermoplastic polyolefinelastomer (TPO), a thermoplastic polyurethane (TPU), a thermoplastic polyamide (thermoplastic). polyamide, TPA), thermoplastic polyethylene (TPE), thermoplastic vulcanizate (TPV) and copolymers of the constituents thereof, and the thermosetting polymer may be an acrylonitrile butadiene rubber. ), Chloro Chlorosulfonated polyethylene rubber, ethylene acrylated rubber, fluorocarbon rubber, hydrogenated acrylonitrile butadiene rubber, perfluoroelastomer , Thermoset polyurethane rubber, thermoset styrene butadiene rubber, thermoset chloroprene rubber, epichlorohydrin copolymer rubber, ethylene propylene diene rubber ethylene propylene diene rubber, fluorosilicone rubber, natural rubber polyisoprene rubber, polyacrylate rubber, or silicone rubber.

In an additive manufacturing method, the magnetic particles may be ferromagnetic particles or ferrimagnetic particles, and the ferromagnetic particles are made of cobalt, nickel, iron, neodymium, oxides thereof, and alloys thereof. Magnetic particles comprising at least one ferromagnetic material selected from the group, wherein the Chinese magnetic particles may be magnetic particles comprising a magnetic material selected from the group consisting of magnetite, and ferrite.

In the production method, the arrangement of the magnetic particles may be determined according to the desired behavior characteristics. For example, when the magnetic particles are randomly dispersed in the projections, they exhibit non-uniform bending behavior, and when they are arranged in the same direction as the direction of the magnetic field used for the magnetic-sensitive behavior, they show no response. When the direction is perpendicular to the direction of the magnetic field to be used and is arranged in a direction parallel to the substrate, it exhibits warping behavior, is perpendicular to the direction of the magnetic field used for the self-sensitization behavior, and is also perpendicular to the substrate. In this case, it shows uniform bending behavior, and in the case of being arranged in a direction perpendicular to the direction of the magnetic field used for the self-sensitive behavior, and arranged in a direction except for planes parallel to and perpendicular to the substrate.

In the manufacturing method, the substrate may be a magnetic substrate or a non-magnetic substrate, the material may be a metal, ceramic, semiconductor, thermosetting polymer or thermosetting polymer or a composite material of any two or more thereof.

According to another aspect of the invention, there is provided a method for locally selective deformation of the magnetic polymer projections in the magnetic polymer composite structure, comprising applying an external magnetic field in a predetermined direction to the magnetic polymer composite structure. .

In the above method, the polymer is a polymer including any one or more of a thermoplastic polymer or a thermosetting polymer selected from the group consisting of urethane, olefin, styrene, epoxy, sulfur, imide, amide and ester. The thermoplastic polymer may be, in more detail, a thermoplastic styrene block copolymer, a thermoplastic polyolefinelastomer (TPO), a thermoplastic polyurethane (TPU), a thermoplastic polyamide , TPA), thermoplastic polyethylene (TPE), thermoplastic vulcanizate (TPV), thermoplastic polydimethylsiloxane (thermoplastic PDMS) and copolymers of the constituents thereof, and the thermosetting polymer is acrylic Ronitrile butadi Acrylonitrile butadiene rubber, chlorosulfonated polyethylene rubber, ethylene acrylated rubber, fluorocarbon rubber, hydrogenated acrylonitrile butadiene rubber ), Perfluoroelastomer, thermoset polyurethane rubber, thermoset styrene butadiene rubber, thermoset chloroprene rubber, epichlorohydrin copolymer rubber copolymer rubber, ethylene propylene diene rubber, fluorosilicone rubber, polyisoprene rubber, polyacrylate rubber, or silicone rubber Can be.

In the additive method, the magnetic particles may be ferromagnetic particles or ferrimagnetic particles, and the ferromagnetic particles are cobalt, nickel, iron, neodymium, oxides thereof, and alloys thereof. Magnetic particles including at least one ferromagnetic material selected from, and the Chinese magnetic particles may be magnetic particles including a magnetic material selected from the group consisting of magnetite, and ferrite.

In the method, the arrangement of the magnetic particles can be determined according to the desired behavior characteristics. For example, when the magnetic particles are randomly dispersed in the projections, they exhibit non-uniform bending behavior, and when they are arranged in the same direction as the direction of the magnetic field used for the magnetic-sensitive behavior, they show no response. When the direction is perpendicular to the direction of the magnetic field to be used and is arranged in a direction parallel to the substrate, it exhibits warping behavior, is perpendicular to the direction of the magnetic field used for the self-sensitization behavior, and is also perpendicular to the substrate. In this case, it shows uniform bending behavior, and in the case of being arranged in a direction perpendicular to the direction of the magnetic field used for the self-sensitive behavior, and arranged in a direction except for planes parallel to and perpendicular to the substrate.

In the method, the substrate may be a magnetic substrate or a non-magnetic substrate, and the material may be a metal, a ceramic, a semiconductor, a thermosetting polymer or a thermosetting polymer, or a composite material of any two or more thereof.

According to another aspect of the present invention, a conductor is inserted into the protrusion in a magnetic polymer composite structure including the magnetic particles physically or chemically attached to the substrate by one or more protrusions composed of a magnetic polymer composite in which the magnetic particles are disposed in the polymer. Or attached, to adjust the direction in which electricity flows by adjusting the self-sensing direction of the protrusions.

In the electrode structure, the conductor may be a metal or carbon material, the metal may be gold, silver, copper, iron, nickel, or chromium, the carbon material may be carbon nanotubes, carbon black or graphene have.

In the electrode structure, the protrusions may be provided in plural, and a distance between the two protrusions may be a distance that may be in contact with each other when self-sensitive.

The present inventors have made diligent efforts to develop a microstructure including a plurality of protrusions capable of freeing various forms of deformation. As a result, the inventors have introduced magnetic particles by controlling the arrangement in the polymer constituting the protrusions. The present invention has been completed by demonstrating that it is possible to locally implement various protrusion behaviors such as bending, twisting and twisting by adjusting the alignment direction and the direction of the magnetic field. Due to the above characteristics, the composite structure according to the embodiment of the present invention can be used for various purposes such as actuators, pumps, switches, and valves of microstructures, and the direction of the current by connecting the conductor to the protrusions. It can be used as an adjustable variable electrode.

Hereinafter, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram schematically showing a projection composed of a polymer-magnetic particle composite material according to an embodiment of the present invention. As shown in FIG. 1, the magnetic polymer composite protrusion 100 composed of the polymer-magnetic particle composite material includes the magnetic particles 120 in the polymer 110, and the magnetic polymer composite protrusion 100 is chemically formed on the substrate. Or physically coupled.

FIG. 2 schematically illustrates a polymer composite structure 300 according to an embodiment of the present invention, in which a plurality of protrusions 100 illustrated in FIG. 1 are fixed on a substrate 200. It is a schematic diagram shown. As shown in FIG. 2, in the structure 300, a plurality of magnetic polymer composite protrusions 100 are arranged on the substrate 200 at regular intervals, and have an external magnetic field 400 having a predetermined direction outside the structure 300. ) May be applied.

3 schematically illustrates various arrangement directions (upper) of magnetic particles 120 in the magnetic polymer composite protrusion 100 and corresponding self-sensitive deformation behavior (bottom) of the protrusion 100 according to an embodiment of the present invention. It is a schematic diagram shown. As shown in FIG. 3, the magnetic polymer composite protrusion 100 exhibits a shape change in response to the external magnetic field 400 according to the arrangement of the magnetic particles 120 therein, a) the magnetic particles 120 having protrusions ( 100 is randomly distributed within 121, indicating non-uniform bending behavior, and b) no response when arranged in the same direction as the direction of the magnetic field 400 used for self-sensitive behavior (122). C) a twisting behavior when the direction is perpendicular to the direction of the magnetic field 400 used for self-sensitive behavior and arranged in a direction parallel to the substrate (123), and d) used for self-sensitive behavior. If the direction is perpendicular to the direction of the magnetic field 400, and also arranged in the vertical direction with the substrate (124) shows a uniform bending behavior, e) is perpendicular to the direction of the magnetic field 400 used for the magnetic-sensitive behavior Plane parallel to the substrate And (125) twisting behavior when arranged in a direction other than the vertical plane.

FIG. 4 is a series of photographs (top) of the projections shown in FIG. 3 taken by a scanning electron microscope, and a series of photographs (bottom) of self-sensitization behavior of these projections.

FIG. 5 is a graph showing the degree of self-response of the magnetic polymer protrusions according to the strength of the magnetic field (torsion angel, left), bending angle (center), and recording the graph (upper) and distortion during 100 cycles. The graph (bottom) which recorded the angle (left side) and the bending angle (center) is shown, and the right side is the graph which superimposed the said twist angle and the bending angle. As shown in FIG. 5, the change in the self-sensitized shape of the structure 300 is uniform in a wide area, and the degree of behavior varies according to the change in the intensity of the magnetic field, and the uniform behavior is changed in two or more times the change in the self-sensed form. It is characterized by the visible. In FIG. 5, the twist angle according to the strength of the external magnetic field 400 of the protrusion 150 having a uniform twisting behavior, the protrusion 160 having a uniform bending behavior, and the protrusion 170 having the twisting behavior is shown in FIG. 5. The bending angles were measured, and even angles were observed after 100 self-sensitization behaviors. The black point is the initial self-sensitive behavior angle and the blue, black point is the self-sensitive behavior angle at 100 times. It can be seen that the self-response angle according to each turn is the same for 100 times.

FIG. 6 is a sample image of magnets in which magnetic particles are arranged and four kinds of self-sensitization behaviors in one sample. As shown in FIG. 6, protrusions having different arrangements of magnetic particles 120 in a freestanding form are disposed so that upon application of a magnetic field, four self-sensitizing behaviors appear in specific regions within a sample. The parts marked in pink are unresponsive protrusions 140, the portions marked in red are protrusions 150 showing twisting behavior, the portions marked in black are protrusions 160 showing uniform bending behavior, and the portions marked in blue are twisting behavior. Protruding protrusion 170 is disposed.

Figure 7 is a substrate showing the letter "INHA" as a projection showing the non-responsive self-responsive behavior to the magnetic field in order from the left, the substrate having a projection showing the distortion behavior in response to the magnetic field, uniform bending behavior It is a series of photographs taken before the magnetic field application (upper) and after the magnetic field application (lower) for the substrate arranged with the projection showing the twisting and the substrate showing the twisting behavior. As shown in FIG. 7, depending on the arrangement of the protrusions 100, a letter or a picture containing a specific meaning may be induced when the structure 300 is self-sensitized. The protrusions 150 showing the twisting behavior, the protrusions 160 showing the uniform bending behavior, and the protrusions 170 showing the twisting behavior are arranged or arranged in the outer region in the portion to be meant, and the rest of the external magnetic field 400 By placing the protrusions 150 which are non-responsive in response to), a shape as shown in FIG. 7 may be induced during the self-sensitive behavior.

8 is a schematic diagram schematically illustrating an electrode structure capable of adjusting a direction in which electricity flows by changing a direction in which electricity flows due to a change in the direction of self-sensitization behavior of the protrusion according to a pole change of an external magnetic field. As shown in FIG. 8, one or more of the conductors 510, such as a metal such as gold, silver, copper, carbon nanotube, and carbon material, such as graphene, may be inserted into or attached to the protrusion 100. In response to the external magnetic field 400, it is possible to flow electricity by acting as an electrode during the shape conversion, and the direction of the self-sensitive behavior of the protrusion 100 is changed according to the pole change of the external magnetic field 400 The direction may be changed, and thus may serve as an electrode structure 500 capable of adjusting the electric direction.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples. However, Examples and Experimental Examples of the present invention are provided to more fully explain the present invention to those skilled in the art, the following examples may be modified in many different forms, The scope of the invention is not limited to the following examples. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of description.

Example 1 Preparation of Magnetic Polymer Composite Projection

The structure according to the embodiment of the present invention was manufactured using replica molding, which is one of soft lithography methods. In the holes corresponding to the projections of the negative PDMS template with the hydrophobic coating, a mixture of resin and magnetic particles containing 9: 1 by weight of PDMS (polydimethylsiloxane) precursor and a crosslinking agent in a weight ratio of 9: 1 was cast only in the holes. Then, after forming a uniform magnetic field using two magnets or electromagnets with a space therebetween, the direction of arrangement of the magnetic particles 120 in the projections between the magnetic fields was arranged in a direction corresponding to each projection. Thereafter, the magnetic field was removed to fix the arrangement of the magnetic particles 120. Pour the resin mixed with the PDMS precursor and the crosslinking agent in a weight ratio of 10: 1 to the remaining portion of the negative PDMS mold by removing the air bubbles and then drying the oven at 80 ° C. And crosslinked for about 2 hours. The negative PDMS template was removed to complete the structure with the protrusions responding to the magnetism. In the arrangement of the projections, there is a method of simply giving an arrangement of magnetic particles by using a weak magnet, and a method of forming a pole by applying magnetism to particles using a strong magnet used for NMR or a corresponding electromagnet. . In the latter case, the direction of the magneto-sensitive behavior is determined by the poles of the magnets or electromagnets used for the magnetic-sensitization. In the former case, as shown in FIGS. 3 and 4, the protrusion 150 exhibiting the twisting behavior, the protrusion 160 exhibiting the uniform bending behavior, and the protrusion 170 exhibiting the twisting behavior are magnetic particles for behavior in a desired direction. The uniform behavior is observed by giving the array an axis and a slight tilt angle.

Whether the structure 300 according to an embodiment of the present invention was properly manufactured was confirmed by photographing with a scanning electron microscope (Hitachi S-4300, Japan) (top of FIG. 3).

Experimental Example 1 Analysis of Behavior of Magnetic Polymer Composite Projections

The behavior of the protrusions 100 according to the arrangement direction of each magnetic particle was confirmed by photographing with an image microscope (SV-32, SOMETECH Vision). The behavior angle was also induced by adjusting the gap between the magnets and controlling the intensity of the magnetic field to induce self-responsive behavior, and measured using the image microscope. At this time, in the case of the twist angle, the angle was measured by taking a top-down view, and the angle was measured by photographing the side of the sample in the case of the bending angle. In the case of the protrusion showing the twisting behavior, the angle was measured by photographing from the top-down and the side (FIG. 5).

As a result, as shown in FIG. 5, the change in the self-sensitized shape of the structure 300 is uniform in a wide area, and the degree of behavior varies according to the change in the intensity of the magnetic field, and is uniform in two or more times of the change in the self-sensed form. It is characterized by showing the behavior. In FIG. 5, the twist angle according to the strength of the external magnetic field 400 of the protrusion 150 having a uniform twisting behavior, the protrusion 160 having a uniform bending behavior, and the protrusion 170 having the twisting behavior is shown in FIG. 5. The bending angles were measured, and even angles were observed after 100 self-sensitization behaviors. The black point is the initial self-sensitive behavior angle and the blue, black point is the self-sensitive behavior angle at 100 times. Self-response angles for each turn were also confirmed to be the same for 100 times.

Example 2: Confirmation of the behavior of the structure having the protrusions showing the various behaviors in one sample

The inventors then produced a structure having various magnetic particle arrangements on one substrate and exhibiting various behavior characteristics when an external magnetic field was applied.

To this end, specifically, after casting the PDMS resin containing magnetic particles in the negative PDMS mold as in Example 1, four neodymium magnets are arranged in 2X2 as shown in the upper left ear of FIG. A magnetic field was formed to show different arrangements of magnetic particles depending on the location of the structure.

FIG. 6 is a sample image of magnets in which magnetic particles are arranged and four kinds of self-sensitization behaviors in one sample. As shown in FIG. 6, protrusions having different arrangements of magnetic particles 120 in a freestanding form are disposed so that four magnetic-sensitization behaviors are shown in specific regions in a sample when the magnetic field is applied. Specifically, the portions marked in pink are unresponsive protrusions 140, the portions marked in red are protrusions 150 showing twisting behavior, and the portions marked in black are protrusions 160 showing uniform bending behavior, and the portions indicated in blue. The protrusion 170 showing the twisting behavior was formed.

As such, since the structure 300 according to the exemplary embodiment of the present invention may control the arrangement direction of the magnetic particles in the protrusions differently in one structure, the behavior characteristics of the self-sensitive protrusions when the external magnetic field is applied differently. I can regulate it.

In addition, the present inventors have experimentally demonstrated that the structure according to the embodiment of the present invention can be used for displaying a specific character using an external magnetic field.

To this end, the inventors made a specific character such as "INHA" on the substrate using projections set in the direction of the arrangement of magnetic particles, each of which exhibits the four behavioral characteristics, and photographing the images before and after applying an external magnetic field with the image microscope. (FIG. 7).

Figure 7 is a substrate showing the letter "INHA" as a projection showing the non-responsive self-responsive behavior to the magnetic field in order from the left, the substrate having a projection showing the distortion behavior in response to the magnetic field, uniform bending behavior It is a series of photographs taken before the magnetic field application (upper) and after the magnetic field application (lower) for the substrate arranged with the projection showing the twisting and the substrate showing the twisting behavior. As shown in FIG. 7, depending on the arrangement of the protrusions 100, a letter or a picture containing a specific meaning may be induced when the structure 300 is self-sensitized. The protrusions 150 showing the twisting behavior, the protrusions 160 showing the uniform bending behavior, and the protrusions 170 showing the twisting behavior are arranged or arranged in the outer region in the portion to be meant, and the rest of the external magnetic field 400 By placing the protrusions 150 which are non-responsive in response to), a shape as shown in FIG. 7 can be induced during the self-sensitive behavior.

The structure according to an embodiment of the present invention is arranged adjacent to the projections having various behavior characteristics as shown in Figure 8 in addition to the use as described above, by inserting or contacting the conductor to the projection, adjacent projections when applying an external magnetic field It can also be used as a variable switch or electrode that controls the short circuit of the current by contacting, or changes the direction of the current by changing the polarity of the magnetic field.

Although the present invention has been described with reference to the above-described examples and experimental examples, these are merely exemplary, and various modifications and equivalent other examples and experimental examples are possible to those skilled in the art. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100: magnetic polymer composite projection
110: polymer
120: magnetic particles
121: projections in which magnetic particles are randomly dispersed
122: projection in which magnetic particles are arranged in a direction parallel to the magnetic field direction
123: projections in which magnetic particles are perpendicular to the direction of the magnetic field and arranged parallel to the substrate
124: projections in which magnetic particles are perpendicular to the direction of the magnetic field and also perpendicular to the substrate
125: projections in which magnetic particles are perpendicular to the direction of the magnetic field and arranged in a direction parallel to the substrate and excluding the plane in the vertical direction
130: projection showing uneven bending behavior
140: no reaction projection
150: protrusion showing warping behavior
160: projection showing uniform bending behavior
170: turning showing twisting behavior
200: substrate
300: magnetic polymer composite structure
400: magnetic field direction
500: electrode structure that can control the direction of electricity flow
510: conductor

Claims (19)

At least one protrusion composed of a magnetic polymer composite having magnetic particles disposed in a polymer is physically or chemically attached to a substrate, so that the protrusion is sensitive to an external magnetic field to enable local selective deformation. The method of claim 1,
The polymer is a magnetic polymer composite material, which is a polymer including any one or more of a thermoplastic polymer or a thermosetting polymer selected from the group consisting of urethane, olefin, styrene, epoxy, sulfur, imide, amide and ester Structure. The method of claim 2,
The thermoplastic polymer may be a thermoplastic styrene block copolymer, a thermoplastic polyolefinelastomer (TPO), a thermoplastic polyurethane (TPU), a thermoplastic polyamide (TPA), or a thermoplastic polyethylene (TPA). thermoplastic polyethylene (TPE), thermoplastic vulcanizate (TPV), thermoplastic polydimethylsiloxane (thermoplastic PDMS) and a copolymer of the units constituting the magnetic polymer composite structure. The method of claim 2,
The thermosetting polymer is acrylonitrile butadiene rubber, chlorosulfonated polyethylene rubber, ethylene acrylated rubber, fluorocarbon rubber, hydrogenated acrylonitrile Butadiene rubber (hydrogenated acrylonitrile butadiene rubber), perfluoroelastomer, thermoset polyurethane rubber, thermoset styrene butadiene rubber, thermoset chloroprene rubber, thermoset chloroprene rubber Epichlorhydrin copolymer rubber, ethylene propylene diene rubber, fluorosilicone rubber, polyisoprene rubber, polyacrylate rubber, In addition Is a silicone rubber, magnetic polymer composite structure. The method of claim 1,
The magnetic particles are ferromagnetic particles or ferrimagnetic particles, magnetic polymer composite structure. The method of claim 5,
Wherein said ferromagnetic particles are magnetic particles comprising at least one ferromagnetic material selected from the group consisting of cobalt, nickel, iron, neodymium, oxides thereof and alloys thereof. The method of claim 5,
The magnetic magnetic particles are magnetic particles, magnetic particles comprising a magnetic material selected from the group consisting of magnetite, and ferrite, magnetic polymer composite material structure. The method of claim 1,
And the substrate is a magnetic substrate or a non-magnetic substrate. The method of claim 1,
The substrate is made of a metal, ceramic, semiconductor, thermosetting polymer or thermosetting polymer or a composite material of any two or more thereof, magnetic polymer composite structure. The method of claim 1,
Wherein said magnetic particles have an arrangement of at least one of the following, in whole or in part, of said substrate:
Iii) magnetic particles are randomly dispersed within the projections;
Ii) arranged in the same direction as the direction of the magnetic field used for self-sensitive behavior;
Iii) perpendicular to the direction of the magnetic field used for self-sensitive behavior and arranged in a direction parallel to the substrate;
Iii) perpendicular to the direction of the magnetic field used for self-sensitive behavior, and also arranged perpendicular to the substrate; And
Iii) perpendicular to the direction of the magnetic field used for self-sensitive behavior, arranged in a direction other than the plane parallel and perpendicular to the substrate. Disposing magnetic particles in the polymer to prepare magnetic polymer protrusions; And
Method of manufacturing the magnetic polymer composite structure comprising the step of physically or chemically attaching the magnetic polymer projections on a substrate. The method of claim 11,
Wherein said magnetic particles are disposed to have at least one or more of the following arrangements in whole or in part with the substrate:
Iii) magnetic particles are randomly dispersed within the projections;
Ii) arranged in the same direction as the direction of the magnetic field used for self-sensitive behavior;
Iii) perpendicular to the direction of the magnetic field used for self-sensitive behavior and arranged in a direction parallel to the substrate;
Iii) perpendicular to the direction of the magnetic field used for self-sensitive behavior, and also arranged perpendicular to the substrate; And
Iii) perpendicular to the direction of the magnetic field used for self-sensitive behavior, arranged in a direction other than the plane parallel and perpendicular to the substrate. According to another aspect of the invention, a method for locally selective deformation of the magnetic polymer projections in the magnetic polymer composite structure comprising the step of applying an external magnetic field in a predetermined direction to the magnetic polymer composite structure. The method of claim 13,
When the magnetic particles are randomly dispersed in the projections, they exhibit non-uniform bending behavior, and when they are arranged in the same direction as the direction of the magnetic field used for the magnetic-sensitive behavior, they are non-responsive and used for the magnetic-sensitive behavior. When the direction is perpendicular to the direction of the magnetic field, and arranged in a direction parallel to the substrate, the warpage behavior is exhibited, and when the direction is perpendicular to the direction of the magnetic field used for the self-sensitized behavior, and is also perpendicular to the substrate. Has a uniform bending behavior, and exhibits a twisting behavior when it is arranged in a direction perpendicular to the direction of the magnetic field used for the self-sensitive behavior and arranged in a direction other than a plane parallel to and perpendicular to the substrate. A conductor is inserted into or attached to the magnetic polymer composite structure including the magnetic particles in which one or more protrusions composed of a magnetic polymer composite having magnetic particles disposed within the polymer are physically or chemically attached to a substrate, thereby forming the magnetic- An electrode structure, which can adjust a direction in which electricity flows by adjusting a response direction. The method of claim 15,
The conductor is an electrode structure, metal or carbon material. The method of claim 16,
The metal is an electrode structure, gold, silver, copper, iron, nickel, or chromium. The method of claim 16,
The carbon material is carbon nanotubes, carbon black or graphene, electrode structure. The protrusions are provided in plurality, wherein the spacing between the two protrusions is a distance that can be in contact with each other when self-sensitive.

Images