JP2012228207A - Organism mimic - Google Patents

Organism mimic Download PDF

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JP2012228207A
JP2012228207A JP2011098597A JP2011098597A JP2012228207A JP 2012228207 A JP2012228207 A JP 2012228207A JP 2011098597 A JP2011098597 A JP 2011098597A JP 2011098597 A JP2011098597 A JP 2011098597A JP 2012228207 A JP2012228207 A JP 2012228207A
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biomimetic
direction
structural color
body
color
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JP5794618B2 (en
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Takahiko Hariyama
孝彦 針山
Shigeo Hara
滋郎 原
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Hamamatsu Univ School Of Medicine
国立大学法人浜松医科大学
Hamamatsu Photonics Kk
浜松ホトニクス株式会社
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Abstract

To provide a biomimetic capable of sufficiently ensuring contrast with surrounding colors and capable of accurately controlling the behavior of a living organism.
A structural color body 3 that forms a color by a microphase-separated structure 5 formed by a block copolymer reflects light having a wavelength that is an attracting or repelling color with respect to a target organism, for example, exceeding 70%. Can be reflected at a rate. For this reason, in the biomimetic 1 using the structural color body 3, the saturation of the attracting color and the repellent color is much higher than that of a normal colorant, and it is as clear as if it emits light even in the daytime. Will have. Therefore, the biomimetic 1 can sufficiently ensure contrast with surrounding colors and can accurately control the behavior of the organism. In addition, since the biomimetic 1 uses the structural color body 3 as a reference for the entire body of the beetle, behavior control using the behavior of the beetle can be realized.
[Selection] Figure 1

Description

  The present invention relates to a biomimetic modeled on at least a part of an organism.

  2. Description of the Related Art Conventionally, there are tools that control the behavior of organisms by utilizing the tendency that organisms such as insects are attracted to or repel specific colors. For example, in Patent Document 1, a basic reflective surface obtained by applying black paint on a hard substrate having a convex curved surface, an intermediate layer made of a synthetic resin containing powder of a highly reflective material, and a transparent synthetic resin There is disclosed a bird dressing device in which transparent layers made of the above materials are laminated so as to exhibit a structural color that birds avoid.

JP 2006-149327 A

  In the above-mentioned tools that control the behavior of organisms, the contrast between the color of the tool and the surrounding colors is sufficiently ensured from the viewpoint of more reliably discriminating the attracting and avoiding colors from the target organism. It is important to do.

  The present invention has been made to solve the above-described problems, and provides a biomimetic capable of sufficiently ensuring contrast between surrounding colors and accurately controlling the behavior of a living organism. With the goal.

  In order to solve the above problems, the biomimetic according to the present invention is a biomimetic modeled on at least a part of a living organism, and a block copolymer is formed on the base corresponding to the shape of the site. It is characterized by fixing a structural color body that produces a structural color by a microphase separation structure.

  In this biomimetic, a structural colorant that produces a structural color by the microphase-separated structure formed by the block copolymer is used to provide light with a sufficient intensity to attract and repel colors of the target organism. Can be reflected. Therefore, a sufficient contrast between the color of the biomimetic and the surrounding color can be ensured, and the behavior of the organism can be controlled with high accuracy. Moreover, in this biomimetic, since the above-described structural color body is used as a standard for at least a part of the organism, behavior control using the behavior of the target organism can be realized.

  Moreover, it is preferable that the structural color body is different in the angle dependency of the reflection intensity at a predetermined wavelength between the first direction and the second direction crossing the first direction. Depending on the organism, the color discrimination range may differ depending on the direction. Therefore, by making the angle dependency of the reflection intensity at a predetermined wavelength different depending on the direction, it is possible to distinguish colors from a wider range of organisms.

  In the structural color body, the reflection wavelength is preferably different depending on the viewing angle between the first direction and the second direction intersecting the first direction. Depending on the organism, the distinguishable wavelength may differ depending on the direction. Therefore, by making the reflection wavelength different depending on the direction, it is possible to make the organism prefer the structural color body.

  In addition, it is preferable that the structural color body has a black fixing portion with the base portion. In this case, the influence of the color of the base portion can be prevented from reaching the color of the structural color body.

  According to the biomimetic according to the present invention, a sufficient contrast with surrounding colors can be ensured, and the behavior of the organism can be controlled with high accuracy.

It is a disassembled perspective view which shows one Embodiment of the biomimetic which concerns on this invention. It is a top view of FIG. It is a figure which shows the characteristic of the biomimetic shown in FIG. It is a figure which shows the characteristic of the biomimetic which concerns on a modification.

  Hereinafter, preferred embodiments of a biomimetic according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view showing an embodiment of a biomimetic according to the present invention. FIG. 2 is a plan view of FIG. As shown in FIGS. 1 and 2, the biomimetic 1 includes a base portion 2 and a structural color body 3. The biomimetic 1 is configured as a tool for controlling the behavior of a living organism by utilizing the tendency that a living organism such as an insect is attracted to or repels a specific color. Although various organisms can be envisaged as organisms whose behaviors are to be controlled, this embodiment targets a beetle.

  The base portion 2 is formed of, for example, synthetic resin such as polyethylene, polypropylene, polystyrene resin, acrylic resin, polyester resin, epoxy resin, fluororesin, silicon rubber, nitrile rubber, butadiene rubber, metal material, glass, wood, and the like. . The base portion 2 has an elongated elliptical planar shape so as to simulate the larvae of a beetle, and the surface side is gently curved in a convex shape.

  The structural color body 3 has an elongated oval shape corresponding to the planar shape of the base portion 2 and is fixed to the surface side of the base portion 2 by, for example, adhesion. The back surface 3b of the structural color body 3 fixed to the base portion 2 is black due to the application of a film or application of a paint.

  The structural color body 3 contains a polymer block copolymer. The block copolymer is a copolymer in which two or more kinds of polymer chains (segments) are bonded. For example, a first polymer chain having monomer A as a structural unit and a second polymer chain having monomer B as a structural unit. And a copolymer in which the ends of the polymer chain are bonded to each other.

  Specific examples of the block copolymer include polystyrene-b-poly (methyl methacrylate), polystyrene-b-poly (ethyl methacrylate), polystyrene-b-poly (propyl methacrylate), and polystyrene-b-poly (tert-butyl). Methacrylate), polystyrene-b-poly (n-butyl methacrylate), polystyrene-b-poly (isopropyl methacrylate), polystyrene-b-poly (pentyl methacrylate), polystyrene-b-poly (hexyl methacrylate), polystyrene-b-poly (Decyl methacrylate), polystyrene-b-poly (dodecyl methacrylate), polystyrene-b-poly (methyl acrylate), polystyrene-b-poly (tert-butyl acrylate), polystyrene-b Polybutadiene, polystyrene-b-polyisoprene, polystyrene-b-polydimethylsiloxane, polybutadiene-b-polydimethylsiloxane, polyisoprene-b-polydimethylsiloxane, polyvinylpyridine-b-poly (methyl methacrylate), polyvinylpyridine-b- Poly (tert-butyl methacrylate), polyvinylpyridine-b-polybutadiene, polyvinylpyridine-b-isoprene, polybutadiene-b-polyvinylnaphthalene, polyvinylnaphthalene-b-poly (methyl methacrylate), polyvinylnaphthalene-b-poly (tert-butyl) 2-block copolymers such as methacrylate), polystyrene-b-polybutadiene-b-poly (methyl methacrylate), polystyrene-b-polybutadiene- -Ternary block copolymers such as poly (tert-butyl methacrylate), polystyrene-b-polyisoprene-b-poly (methyl methacrylate), polystyrene-b-polyisoprene-b-poly (tert-butyl methacrylate), etc. Can be mentioned. The block copolymer is not limited to the above as long as the refractive index is different between polymer chains.

  The lower limit value of the weight average molecular weight (Mw) of the block copolymer is 8.0 × 105 (g / mol) from the viewpoint that a periodic structure necessary for expressing the optical properties as the structural color body 3 can be obtained satisfactorily. ) Or more, preferably 9.0 × 10 5 (g / mol) or more, and more preferably 1.0 × 10 6 (g / mol) or more.

  The upper limit value of the weight average molecular weight is preferably 3.0 × 10 6 (g / mol) or less from the viewpoint of obtaining a more favorable periodic structure necessary for expressing the optical properties as the structural color body 3. 0.5 × 10 6 (g / mol) or less is more preferable, and 2.0 × 10 6 (g / mol) or less is more preferable. In addition, a weight average molecular weight can be obtained as a weight average molecular weight of polystyrene conversion using gel permeation chromatography (GPC).

  The structural color body 3 has a microphase separation structure 5 inside as shown in FIG. The micro phase separation structure refers to an aggregate in which micro domains are periodically arranged. A micro domain refers to a phase formed by phase separation of different types of polymer chains of a block copolymer without mixing with each other. The microphase separation structure 5 is a refractive index periodic structure 7 formed by alternately laminating lamellar microdomains 7a and lamellar microdomains 7b. Each of the micro domains 7a and 7b is oriented substantially parallel to at least one of the front surface 3a and the back surface 3b of the structural color body 3, and in this embodiment, is substantially parallel to both the front surface 3a and the back surface 3b. Is oriented.

  The microdomain 7a includes one polymer chain 9a of the block copolymer as a main component, and the microdomain 7b includes another polymer chain 9b of the block copolymer as a main component. The repetition period of the microdomains 7a and 7b and the arrangement of the polymer chains 9a and 9b are not limited to those shown in FIG.

  With the micro phase separation structure 5 as described above, the structural color body 3 can reflect light having a wavelength that is an attracting color or a repelling color with respect to a target organism with a reflectance exceeding 70%, for example. For this reason, in the biomimetic 1 using the structural color body 3, the saturation of the attracting color and the repellent color is much higher than that of a normal colorant, and it is as clear as if it emits light even in the daytime. Will have. Therefore, the biomimetic 1 can sufficiently ensure contrast with surrounding colors and can accurately control the behavior of the organism. Moreover, in this biomimetic 1, since the whole body of the beetle is used as a standard using the structural color body 3, the behavior control using the behavior of the beetle can be realized.

  Further, in the structural color body 3, the angle dependency of the reflection intensity in the attracting color or the repelling color is present between the body length direction (first direction) of the beetle and the body width direction (second direction) intersecting with this. Is different. In the example shown in FIG. 3, the angle dependency of the reflection intensity at a predetermined wavelength (for example, 560 nm) in the structural color body 3 is shown. In this example, the full width at half maximum of the reflection intensity is about ± 10.5 ° in the body length direction and about ± 7 ° in the body width direction, and light is more widely spread in the body length direction than in the body width direction. It is designed to reflect.

  The angle dependency of the reflection intensity is adjusted by including in the structural color body 3 microdomains (microdomains having regions that are not oriented substantially parallel to the front surface 3a and the back surface 3b of the structural color body 3). Is possible. For organisms such as buprestids, which have different color discrimination ranges depending on the direction, structural color bodies can be more favored by varying the angle dependency of the reflection intensity depending on the direction.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the biomimetic having the shape of the whole organism to be controlled is exemplified, but it may be a part of a living body such as a trunk or a wing. Moreover, it is not restricted to what imitates the target organism itself that controls the behavior, but may be a portion imitating a part of another animal or plant related to the behavior of the organism.

  In the above-described embodiment, the angle dependency of the reflection intensity is different between the first direction of the structural color body and the second direction intersecting with the first direction. For example, as shown in FIG. The reflection wavelength may be different between the first direction and the second direction crossing the first direction. Depending on the organism, the discriminable wavelength may differ depending on the direction. Therefore, by making the reflection wavelength different depending on the direction, it is possible to make the organism prefer the structural color body. It is also possible to trigger spectrum light that changes in an angle-dependent manner, such as a flight approaching action.

  Hereinafter, examples of the biomimetic will be described. In producing the biomimetic according to the example, first, the beetle moth was cut into 3 mm square pieces, and the angle dependency of the reflection intensity was evaluated. As a result, the full width at half maximum of the reflection intensity of the beetle moth was about ± 10.5 ° in the body length direction and about ± 7 ° in the body width direction.

  Next, a biomimetic was prepared by attaching a small piece of a beetle moth on a base made of a synthetic resin, and the flight behavior of the beetle was observed. When sticking a small piece of a head bug on the base, a sample (sample A) pasted in the same direction as before cutting, and a sample (sample B) pasted by 90 ° rotation from the direction before cutting Prepared. When these two kinds of samples were attached to the tip of the rod and observed on a clear day, sample A showed about 90% of individuals who flew to the vicinity and tried to mate, but in sample B, the flight approached. About 0% of individuals tried to mate.

Based on the above results, a structural color body having the dependency on the angle of the reflecting mirror was produced in the same manner as the beetle moth. Polystyrene-b-poly (tert-butyl methacrylate) was used as the polymer block copolymer that is the basis of the structural color body. The sample used was synthesized by living anionic polymerization under vacuum (weight average molecular weight = 1.0 × 10 6 g / mol, polystyrene: poly (tert-butyl methacrylate) = 38: 62 vol.%).

  Next, the polymer block copolymer is 15.0% by mass in a mixed solvent of 1,6-bis (acryloyloxy) hexane, which is a photopolymerizable monomer, and lauryl acrylate in a weight ratio of 50:30. So that it was dissolved. Moreover, the photoinitiator (Ciba Specialty Chemicals company make: IRGACURE651) was added so that it might become 0.3 mass% with respect to 1, 6-bis (acryloyloxy) hexane. In this solution, the polymer block copolymer forms a lamellar microphase separation structure and exhibits a structural color.

  Subsequently, this solution was dropped on a quartz glass disk having a diameter of 10 cm, and developed into a film shape by being sandwiched between quartz glass disks having the same diameter through a 0.3 mm spacer. Further, by moving a quartz glass disk sandwiching the solution, a shear flow field was applied to the solution to orient the lamellar microphase separation structure. After applying the shear flow field, annealing was performed at room temperature for 10 minutes so as not to add excessive flow to improve the regularity of the microphase separation structure. Thereafter, the solution was cured by irradiating with ultraviolet rays for 5 minutes to obtain a structural color body film in which the microphase separation structure was oriented.

  In applying the shear flow field, first, by oscillating the two quartz glass disks in the uniaxial direction, a uniaxial shear flow field is applied to the solution, and the 90 ° direction from the flow direction is applied. A curved microphase separation structure was formed. As a result, a structural color body film in which the angle dependency of the reflection intensity differs between the body length direction and the body width direction was obtained. In addition, a shear flow field in a random direction was applied to the solution by oscillating the two quartz glass disks in a random direction. As a result, a structural color body film having the same angle dependency of the reflection intensity in the body length direction and the body width direction was obtained.

  After obtaining the film of the structural color body, these were cut out in the shape of a beetle cocoon and pasted on a base made of a synthetic resin to prepare a sample of a biomimetic. As a sample, a sample (sample C) to which a film having no angle dependency is attached (sample C), a sample (sample D) in which a film having an angle dependency is attached in the same direction as the real one, and a film having an angle dependency A sample (sample E) pasted in a direction rotated 90 ° was prepared.

  When these three kinds of samples were attached to the rod tip and the beetle was observed in the same manner as described above, the number of individuals that flew to the vicinity was in the order of sample D> sample E> sample C. The result was similar to that of a real bug. From this result, it was confirmed that the structural color body used in the present invention was effective in controlling the behavior of the beetle.

  DESCRIPTION OF SYMBOLS 1 ... Biomimetic, 2 ... Base part, 3 ... Structural coloring body, 5 ... Micro phase-separation structure.

Claims (4)

  1. A biomimetic modeled on at least part of a living organism,
    A biomimetic comprising a base color corresponding to the shape of the part, and a structural color body that is structurally colored by a microphase separation structure formed by a block copolymer.
  2.   2. The biomimetic according to claim 1, wherein the structural color body is different in angle dependency of reflection intensity at a predetermined wavelength between a first direction and a second direction intersecting the first direction.
  3.   The biomimetic according to claim 1, wherein the structural color body has a reflection wavelength different between a first direction and a second direction intersecting the first direction.
  4. The biomimetic according to any one of claims 1 to 3, wherein the structural color body has a black fixing portion with the base portion.
JP2011098597A 2011-04-26 2011-04-26 Biomimetic Active JP5794618B2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1180379A (en) * 1997-08-29 1999-03-26 Katsunori Funaki Color-developing polymer structure and its production
JP2004043605A (en) * 2002-07-10 2004-02-12 Daicel Chem Ind Ltd Pigment comprising color-forming polymer structure, manufacturing method therefor, and coating material
JP2005146023A (en) * 2003-11-11 2005-06-09 Daicel Chem Ind Ltd Coating film made of chromogenic polymer structure, coating film-forming method and coating material
JP2006149327A (en) * 2004-12-01 2006-06-15 Chubu Electric Power Co Inc Bird threatening tool
JP2006335885A (en) * 2005-06-02 2006-12-14 Fujifilm Holdings Corp Color-developing structure and method for producing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1180379A (en) * 1997-08-29 1999-03-26 Katsunori Funaki Color-developing polymer structure and its production
JP2004043605A (en) * 2002-07-10 2004-02-12 Daicel Chem Ind Ltd Pigment comprising color-forming polymer structure, manufacturing method therefor, and coating material
JP2005146023A (en) * 2003-11-11 2005-06-09 Daicel Chem Ind Ltd Coating film made of chromogenic polymer structure, coating film-forming method and coating material
JP2006149327A (en) * 2004-12-01 2006-06-15 Chubu Electric Power Co Inc Bird threatening tool
JP2006335885A (en) * 2005-06-02 2006-12-14 Fujifilm Holdings Corp Color-developing structure and method for producing the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JPN6015007220; 針山孝彦・弘中満太郎・堀口弘子・高久康春・Kurt Vanhoutte・Doekele Stavenga: 'タマムシを用いた構造色の起源と、構造色弁別能の行動学的解析' Structural Color , 2003, p.4-16 *

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