WO2016027535A1 - 展示用磁性流体コンポジット及び磁性流体コンポジット展示装置 - Google Patents
展示用磁性流体コンポジット及び磁性流体コンポジット展示装置 Download PDFInfo
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- WO2016027535A1 WO2016027535A1 PCT/JP2015/064547 JP2015064547W WO2016027535A1 WO 2016027535 A1 WO2016027535 A1 WO 2016027535A1 JP 2015064547 W JP2015064547 W JP 2015064547W WO 2016027535 A1 WO2016027535 A1 WO 2016027535A1
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- magnetic fluid
- magnetic
- fluid composite
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- water
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F19/00—Advertising or display means not otherwise provided for
- G09F19/02—Advertising or display means not otherwise provided for incorporating moving display members
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
- H01F1/445—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids the magnetic component being a compound, e.g. Fe3O4
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H33/00—Other toys
- A63H33/22—Optical, colour, or shadow toys
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H33/00—Other toys
- A63H33/26—Magnetic or electric toys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0231—Magnetic circuits with PM for power or force generation
Definitions
- the present invention relates to a ferrofluid composite for display and a ferrofluid composite display device, and more particularly, an exhibition suitable for observing and appreciating various shapes of magnetic fluid caused by a spike phenomenon.
- the present invention relates to a magnetic fluid composite for display and a magnetic fluid composite display device using the same.
- the following spike phenomenon is known as an interface phenomenon of a magnetic fluid. That is, when a minute disturbance occurs at the interface in the magnetic fluid attracted by the magnet, the strength of the magnetic field also fluctuates, and the lines of magnetic force concentrate more on the top of the wavefront. The increase in magnetic force results in an increase in the magnetization at the top and a decrease in the magnetization at the valley. Eventually, the deformation proceeds to a position where the magnetic pressure, gravity, and surface tension are balanced, and finally a regular hexagonal pyramid (spike) arranged regularly. ) To stabilize (see, for example, Non-Patent Document 1).
- the magnetic fluid is a liquid in which ultrafine particles of ferrite typified by magnetite are dispersed at a high concentration in the carrier liquid, its color tone is black and absorbs almost all visible light, giving strong illumination. However, no contrast was obtained, and it was difficult to visually recognize the delicate shape. It is also possible to improve the visibility of the magnetic fluid by coloring it by mixing a dye or pigment with the magnetic fluid. However, if sufficient coloring is performed to meet visual recognition and appreciation, the magnetic properties will be significantly reduced. It was not appropriate.
- the present invention has been made in view of such problems of the prior art, and the object of the present invention is to visually recognize subtle shapes resulting from the spike phenomenon and to exhibit colors other than black.
- An object is to provide a magnetic fluid composite for display and a magnetic fluid composite display device.
- the present inventor has found that when a predetermined non-magnetic light shielding piece is used, the light shielding piece is arranged at the interface between water and the oily magnetic fluid. Has been found to be achieved, and the present invention has been completed.
- the magnetic fluid composite for exhibition of the present invention is characterized by containing water, an oily magnetic fluid, and a non-magnetic light shielding piece having a hydrophilic portion.
- the magnetic fluid composite display device of the present invention is a magnetic fluid composite display device using the spike phenomenon of magnetic fluid, A magnetic fluid composite for display as described above, a container having an observation site where the inside can be observed, and a magnetic field generating member, The magnetic field generating member exerts a magnetic force on the exhibiting magnetic fluid composite housed in the container.
- a magnetic fluid composite for display and a magnetic fluid composite exhibit capable of visually recognizing a delicate shape caused by a spike phenomenon and exhibiting a color other than black.
- FIG. 1 is a partially enlarged cross-sectional view schematically showing an enlarged part of one embodiment of a magnetic fluid composite for display according to the present invention.
- the magnetic fluid composite 1 for display is a composite (composite) containing a magnetic fluid, water, and other materials, and includes water 10, an oily magnetic fluid 20, and a non-magnetic light shielding piece 30.
- the light shielding piece 30 has a thin piece shape, and is formed by laminating a hydrophilic layer 31, a light shielding layer 33, and a hydrophilic layer 35 in this order.
- the hydrophilic layer 31 and the hydrophilic layer 35 function as hydrophilic portions, and both layers have the same hydrophilicity.
- the degree of hydrophilicity of these layers can be appropriately changed according to the type of dispersion medium of the oil-based magnetic fluid 20 to be used, and may be so-called superhydrophilic having a contact angle with water of 10 ° or less.
- a certain degree of affinity with oil is also necessary, and it is possible to form a stable interface at least temporarily in contact with the oil-based magnetic fluid 20 and to the extent that the non-magnetic light shielding piece 30 itself is not taken into the oil-based magnetic fluid 20. Oil affinity is also required.
- the light shielding pieces 30 are arranged along the interface 1 i between the water 10 and the oily magnetic fluid 20 in the magnetic fluid composite 1, and either the hydrophilic layer 31 or the hydrophilic layer 35 is oriented to the water 10. And the other is oriented in the oil-based magnetic fluid 20.
- FIG. 1 typically shows a state in which the hydrophilic layer 35 is oriented in the water 10 and the hydrophilic layer 31 is oriented in the oil-based magnetic fluid 20.
- one of the hydrophilic layers 31 and 35 is not necessarily an essential element, and when the light shielding layer 33 has hydrophilicity and oil affinity like the hydrophilic layer, if either one of the hydrophilic layers is present, The light shielding pieces 30 are arranged as described above due to the affinity between the hydrophilic layer and the water 10. Thus, in this magnetic fluid composite 1, the interface 1 i between the water 10 and the oil-based magnetic fluid 20 is covered with a large number of light shielding pieces 30.
- the light-shielding layer 33 of the light-shielding piece 30 is blocked by the light-shielding layer 33 of the light-shielding piece 30.
- the color of the light shielding piece 30, typically the color of the light shielding layer 33 is not visible.
- the light-shielding piece 30, typically the light-shielding layer 33 is a highly light-reflective metal film, the visibility of the light-shielding piece 30 is very good, so that the viewer can determine the overall shape of the interface 1i. It will be clearly visible by the reflected light from the light shielding piece 30.
- the predetermined light shielding pieces 30 are arranged along the interface 1i to cover the entire interface, shield the color of the oily magnetic fluid 20, and the overall shape of the interface 1i. What can be clarified is a phenomenon found by the present inventors. Further, since the light shielding piece 30 as a whole has both hydrophilicity and oil affinity as described above and the orientation of the hydrophilic layers 35 and 31 is also good, even when the shape of the interface 1i changes due to a spike phenomenon or the like. The point of exhibiting good shape followability (see FIG. 2) is also a phenomenon found by the present inventors. In addition, since the light shielding piece 30 has a non-magnetic property, that is, a non-ferromagnetic property, there is almost no adverse effect on the above-described alignment property, orientation property, and shape following property even in a magnetic field.
- normal water may be used as water, and tap water, ion exchange water, so-called pure water, or the like can be used.
- oily magnetic fluid a conventionally known oily magnetic fluid can be used.
- oil-based ferrofluids are typically ferritic magnetism such as Fe ferrite (ie magnetite), Mn ferrite, Co ferrite, Ni ferrite, Zn ferrite, Mn—Co ferrite, Mo—Ni ferrite and Mo—Zn ferrite.
- the particles are finely dispersed in an oil-based dispersion medium such as kerosene in the presence of a surfactant such as oleic acid.
- the non-magnetic light shielding piece having a hydrophilic portion and oil affinity is not particularly limited as long as it is in the form of a thin fine film having hydrophilicity, oil affinity, non-magnetic property and light shielding property, and is a metal thin piece.
- a hard magnetic film is vapor-deposited on a fine thin resin film, and further subjected to a hydrophilic treatment with a surfactant or the like, an epoxy resin or the like after vapor deposition of the metal film on the resin film. Can be applied and further subjected to a discharge treatment.
- a hard-magnetic light-shielding piece what uses a fine plate-like inorganic substance, such as glass and mica, as a base material other than what uses a resin film as a base material can be used.
- the light shielding layer it is possible to use not only the above metal film but also a metal oxide film represented by titanium oxide (TiO 2 ) or alumina (Al 2 O 3 ).
- thermoplastics as the resin constituting the resin film, conventionally known thermoplastics can be exemplified, but nylon, polyimide, polycarbonate, ethylene / vinyl acetate copolymer (EVA), ethylene / methacrylic acid copolymer ( EMMA) and polyethylene terephthalate can be preferably used.
- EVA ethylene / vinyl acetate copolymer
- EMMA ethylene / methacrylic acid copolymer
- metal terephthalate preferably used as a metal which comprises a metal film.
- a non-magnetic metal for example, aluminum (Al), silver (Ag), zinc (Zn), gold (Au), and copper (Cu) can be mentioned.
- the above-mentioned light shielding piece there is one that is sold as a glossy material for cosmetics under the name of lame material, which is finely cut after depositing a metal such as aluminum on a plastic film such as polyethylene terephthalate.
- lame material which is finely cut after depositing a metal such as aluminum on a plastic film such as polyethylene terephthalate.
- lame material there can be mentioned those obtained by subjecting this lame material to a hydrophilic treatment. Since lame wood has a highly lipophilic plastic surface, if it is added to a mixture of oily ferrofluid and water without treatment, it is selectively wetted only by the ferrofluid and is taken into the ferrofluid. Since such an arrangement along the interface cannot be realized, the visual effect is not exhibited.
- a material called metallic powder which is obtained by applying a metal film such as aluminum to a colored or non-colored resin film and freeze-drying a laminated film in which the same kind of resin film is applied, is also the same as the lame material. Can be used for
- the light-shielding piece preferably has hydrophilicity such that the contact angle between the hydrophilic portion, typically the hydrophilic layer and water, is 15 ° or less, and if it exceeds 15 °, the light-shielding piece becomes oil-based magnetic. It may get trapped inside the fluid.
- the hydrophilicity adjustment in the light shielding piece from the viewpoint of whether the light shielding piece can be arranged along the interface between water and the oily magnetic fluid without being taken into the oily magnetic fluid to be used. What is necessary is just to determine by performing a preliminary test and the hydrophilic process in this case can be performed by surfactant or a discharge process as mentioned above.
- the shape, size, and thickness of the light-shielding piece can be appropriately changed depending on the type of oil-based magnetic fluid to be used and the intended display property, and may be a triangle, polygon, circle, or ellipse. Is a rectangle or square of 0.01 to 2 mm ⁇ 0.01 to 2 mm, and the thickness is 0.5 to 50 ⁇ m. If you deviate from these numerical ranges, the desired display effect may not be obtained.
- the shape may be an indeterminate shape obtained by finely pulverizing a glass thin plate, for example.
- FIG. 3 is a schematic sectional view showing an embodiment of the magnetic fluid composite display device of the present invention.
- symbol is attached
- the magnetic fluid composite display device 2 is an display device that uses the magnetic fluid spike phenomenon in the above-described display magnetic fluid composite, and includes a glass container body 41 and a resin lid 42.
- the container 40 includes a magnetic fluid composite 1 housed therein, and a permanent magnet 50 that is an example of a magnetic field generating member that exerts a magnetic force on the magnetic fluid composite 1.
- a hole 42 h is formed in the lid 42 of the transparent container 40, and a steel collecting member, which is a ferromagnetic material having a rivet shape, is inserted into the transparent container 40 through the hole 42. Projected.
- the display device 2 having the above-described configuration, when the magnetic fluid is applied to the magnetic fluid composite 1 by the permanent magnet 50, the oil-based magnetic fluid 20 and the light shielding piece 30 that are initially deposited on the bottom of the container 40 cause a spike phenomenon. While moving (raising) in the direction of the permanent magnet 50 disposed in the vicinity of the top of the container 40, it adheres to the collecting member 60 and takes a unique shape (see FIG. 3).
- the oily magnetic fluid which is a black liquid that is incompatible with water, could only be seen in water in a state of low visibility.
- the shape of the oil-based magnetic fluid can be visually recognized very clearly by the arrangement of the light shielding pieces along.
- Oil-soluble magnetic fluids can be set with specific gravity by changing the ferrite concentration.Therefore, the magnetic fluid floats in water, the fluid floats in water, and the magnetic fluid sinks to the bottom of the water. It is possible to realize the state.
- the present invention can be implemented in a composite having an oily magnetic fluid in any state.
- the ferrofluid composite can be observed from almost all directions of the container, but the container has a part of the observation window. Can also be used.
- the rivet-shaped steel member was used as the collection member 60, other ferromagnetic materials other than steel can be used as long as the magnetic force from the permanent magnet 50 can be transmitted.
- Its shape can be not only columnar, but also various shapes such as cone, dumbbell, cross, spherical, elliptical and star shape, and the magnetic fluid adhering to this shape also takes various shapes, The ornamental property can be improved.
- the collecting member is not an essential member, and when the composite is small, a sufficient shape change can be realized without the collecting member.
- a permanent magnet is used as an example of the magnetic field generation means, it can be an electromagnet, and in combination with a magnetic force control means such as a current control means, the magnetic force applied to the magnetic fluid composite can be turned on / off, Needless to say, it is possible to change the shape of the magnetic fluid in accordance with the change, and to further improve the viewability.
- Example 1 Aluminum was deposited on a polyethylene terephthalate film (thickness 20 ⁇ m), and then coated with an epoxy resin. When the contact angle of water with respect to this film A was measured, it was 70 °. Next, the film A was processed with a high frequency corona treatment apparatus to obtain a film B. When the contact angle of water was measured in the same manner as above for this film B, it was 10 °.
- the film B obtained as described above is cut into a 0.5 mm ⁇ 0.5 mm square, 0.2 g is weighed, and an oil-based magnetic fluid (magnetite ultrafine particles are added to isoparaffin having a boiling point range of 200 ° C. to 250 ° C. Dispersed, specific gravity 1.05)
- an oil-based magnetic fluid magnetite ultrafine particles are added to isoparaffin having a boiling point range of 200 ° C. to 250 ° C. Dispersed, specific gravity 1.05
- the cut film was submerged in water and further slowly stirred. It was adsorbed at the interface and was not taken into the magnetic fluid.
- the magnets were brought close to each other and spikes were formed, all the interfaces were covered according to the deformation of the magnetic fluid, and it was observed that each spike emitted a metallic luster. This is shown in FIGS.
- Example 1 The film A in Example 1 was cut in the same manner as described above, 0.2 g was weighed and added to a glass container containing 10 ml of the oily magnetic fluid and 90 ml of pure water. In order to bring the cut film into contact with the magnetic fluid, the container was covered and stirred by overturning. As a result, all of the cut film was taken into the magnetic fluid, so that it could not be visually confirmed.
- Example 2 A solution obtained by dissolving 1 g of a superhydrophilic coating agent (LAMBIC-500WP, manufactured by Osaka Organic Chemical Industry) in 100 g of pure water was poured into a vat, and the film A of Example 1 was immersed therein. Next, the vat was placed in a dryer adjusted to 105 ° C. to completely evaporate the water. When the contact angle of water with respect to the film C obtained after cooling to room temperature was measured, it was 5 °. The film C was cut into 0.1 mm ⁇ 0.1 mm, 0.2 g of the film C was added to a container containing magnetic fluid and pure water as in Example 1, and slowly stirred. It was adsorbed at the interface of pure water and was not taken into the magnetic fluid. When spikes were formed by approaching the magnet, all the interfaces were covered according to the deformation of the magnetic fluid, and it was observed that each spike emitted a metallic luster.
- LAMBIC-500WP manufactured by Osaka Organic Chemical Industry
- Example 3 A superhydrophilic coating film (film D) was obtained in the same manner as in Example 2 except that the superhydrophilic coating agent solution of Example 2 was diluted 10-fold with pure water. The contact angle of water with respect to the film D was measured and found to be 15 °. The same operation as in Example 2 was performed, and the cut film was added to a container containing ferrofluid and pure water, and slowly stirred. As a result, most of the film was adsorbed at the interface between ferrofluid and water. The result was slightly inferior in visual effect.
- Example 4 0.2 g of commercially available lame material (manufactured by Fujikura Applied Chemical Co., Ltd., red gold glitter 0.1 ⁇ ) was added to 10 ml of the superhydrophilic coating agent solution prepared in Example 2, and water was completely evaporated in a drier adjusted to 105 ° C. It was. After cooling to room temperature, the whole amount of lame material was added to a glass container containing magnetic fluid and pure water prepared in the same manner as in Example 1. The lame material was submerged in water and stirred slowly. Adsorbed to the interface. When a spike was formed by bringing the magnet closer from the bottom of the container, the entire spike showed a golden luster.
- the degree of hydrophilicity of the hydrophilic layers 31 and 35 of the light shielding piece 30 is not necessarily equal and may be different. By making the degree of hydrophilicity different, it becomes possible to preferentially orient the layer having a strong degree of hydrophilicity toward the water 10.
- the magnetic fluid composite for display and the magnetic fluid composite display device of the present invention are not only suitably used in the toy industry, but can also be applied to various display devices or display devices.
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Abstract
Description
即ち、磁石に吸引された磁性流体に於いて界面に微小な擾乱が生じると、磁場の強さにも変動が生じ、磁力線は波面の頂上部分により多く集中する。磁力の増大は頂上部の磁化の増大と谷部の磁化の減少をもたらし、結局磁気圧力と重力、表面張力が釣り合う位置まで変形が進み、最終的には規則正しく配列された正六角形錐体(スパイク)を形成して安定化する(例えば、非特許文献1参照。)。
また、染料又は顔料を磁性流体に混合することにより着色し、磁性流体の視認性を高めることも考えられるが、視認や鑑賞に応えうる十分な着色を行うと磁気特性が著しく低下してしまうため適当ではなかった。
上述のような展示用磁性流体コンポジットと、内部を観察できる観察部位を有する容器と、磁場発生部材を備え、
上記磁場発生部材は、上記容器に収容された上記展示用磁性流体コンポジットに磁力を及ぼす、ことを特徴とする。
以下、本発明の展示用磁性流体コンポジットについて、図面を参照して詳細に説明する。
図1は、本発明の展示用磁性流体コンポジットの一実施形態の一部を拡大して模式的に示す部分拡大断面図である。
同図において、この展示用磁性流体コンポジット1は、磁性流体と水その他の材料を含む複合体(コンポジット)であって、水10と、油性磁性流体20と、難磁性遮光片30を含有している。また、遮光片30は、薄片状をなしており、親水層31と、遮光層33と、親水層35をこの順で積層して形成されている。
これらの層の親水性の程度は、使用する油性磁性流体20の分散媒の種類などに応じて適宜変更でき、水との接触角が10°以下のいわゆる超親水性であってもよい。但し、油との親和力もある程度は必要であり、油性磁性流体20と接して少なくとも一時的に安定な界面を形成できるとともに、難磁性遮光片30自体が油性磁性流体20の内部に取り込まれない程度の油親和力も必要とされる。
図1においては、代表的に、親水層35が水10に配向し、且つ親水層31が油性磁性流体20に配向した状態を示している。なお、親水層31及び35のいずれか一方は必ずしも必須の要素ではなく、遮光層33が上記親水層のような親水性と油親和力を有する場合、いずれか一方の親水層が存在すれば、当該親水層と水10との親和力により、遮光片30は上述のように配列する。
このように、この磁性流体コンポジット1においては、水10と油性磁性流体20との界面1iを多数の遮光片30であたかも覆っているような状態になっている。
この場合、遮光片30、典型的には遮光層33が光反射性の高い金属被膜などであれば、遮光片30の視認性は極めて良好であり、よって、看者は界面1iの全体形状を遮光片30からの反射光によって明確に視認できることになる。
また、遮光片30は、全体として上述のような親水性と油親和力を併有し、親水層35及び31の配向性も良好であるため、界面1iの形状がスパイク現象などによって変化した場合でも良好な形状追従性を発揮する点(図2参照)も、本発明者が見出した現象である。
なお、遮光片30は、難磁性、即ち強磁性ではない性質を有するため、磁場下におかれも上述の配列性や配向性、形状追従性に対する悪影響は殆どない。
まず、水としては、通常の水でよく、水道水、イオン交換水、いわゆる純水などを使用できる。
また、油性磁性流体としては、従来公知の油性磁性流体を用いることができる。かかる油性磁性流体は、典型的には、Feフェライト(即ちマグネタイト)、Mnフェライト、Coフェライト、Niフェライト、Znフェライト、Mn−Coフェライト、Mo−Niフェライト及びMo−Znフェライトなどのフェライト系の磁性粒子を、オレイン酸などの界面活性剤の存在下でケロシンなどの油系分散媒に微分散したものである。
また、難磁性遮光片としては、樹脂フィルムを基材とするもの以外にも、ガラスやマイカなどの微小な板状無機物を基材とするものを用いることができる。さらに、遮光層としては、上記の金属被膜のみならず、酸化チタン(TiO2)やアルミナ(Al2O3)に代表される金属酸化物の被膜を利用することも可能である、
また、金属被膜を構成する金属としては、難磁性の金属、例えばアルミニウム(Al)、銀(Ag)、亜鉛(Zn)、金(Au)及び銅(Cu)を挙げることができる。
ラメ材は親油性の強いプラスチック表面を有するため、無処理のまま油性磁性流体と水の混合体に添加すると、磁性流体のみに選択的に濡らされてしまって磁性流体内部に取り込まれ、上述のような界面に沿った配列を実現できなくなるので、視覚的効果を発揮することはない。
また、着色又は非着色樹脂フィルムにアルミニウムなどの金属蒸着を施し、さらに同種の樹脂フィルムを被着させた積層フィルムを凍結乾燥して得られる、メタリックパウダー等と称される素材もラメ材と同様に使用することができる。
なお、遮光片における親水性の調整については、使用する油性磁性流体の内部に遮光片が取り込まれてしまわずに水と油性磁性流体の界面に沿って配列できるか否かの観点から、実際に予備試験を行って決定すればよく、この場合の親水処理は上述のように界面活性剤や放電処理によって行うことができる。
これらの数値範囲を逸脱すると、所期の展示効果が得られないことがある。
なお、形状としては、例えばガラス薄板を微粉砕して得られるような不定形でもよい。
次に、本発明の磁性流体コンポジット展示装置について図面を参照して詳細に説明する。
図3は、本発明の磁性流体コンポジット展示装置の一実施形態を示す概略断面図である。なお、上記の部材・要素等と実施的に同一の部材・要素等には同一の符号を付し、その説明を省略する。
また、透明容器40の蓋42には孔部42hが穿設されており、この孔部42を介して、リベット形状を有する強磁性体である鋼製の捕集部材が透明容器40の内部に突設されている。
さらに、捕集部材60としては、リベット状の鋼製部材を用いたが、永久磁石50からの磁力を伝えることができる限り、鋼以外の他の強磁性体材料を用いることができる。その形状も柱状のみならず、錐状、亜鈴状、十字架状、球状、楕円球状及び星形状など各種の形状を採ることができ、これに応じて付着する磁性流体も種々の形状を採るので、観賞性を向上させることができる。
なお、捕集部材は必須の部材ではなく、コンポジットが小型である場合は、捕集部材なしでも十分な形状変化を実現することができる。
また、磁場発生手段の一例として永久磁石を用いたが、電磁石とすることが可能であり、電流制御手段などの磁力制御手段と組み合わせて、磁性流体コンポジットにかかる磁力をオン・オフしたり、周期的又はランダムに変化させることも可能であり、これに応じて磁性流体の形状を変化させ、観賞性をさらに向上できることも言うまでもない。
ポリエチレンテレフタレートフィルム(厚さ20μm)にアルミニウムを蒸着した後、エポキシ樹脂でコーティングした。このフィルムAに対する水の接触角を測定したところ70°を示した。
次に、上記フィルムAを高周波コロナ処理装置で処理してフィルムBを得た。このフィルムBにつき上記同様に水の接触角を測定したところ10°であった。
磁石を接近させスパイクを形成させたところ、磁性流体の変形に応じて全ての界面を被覆し、それぞれのスパイクが金属光沢を放つのが観察された。この様子を図4及び図5に示す。
実施例1におけるフィルムAを上記同様に裁断し、0.2gを秤取し、上記油性磁性流体10mlと純水90mlを入れたガラス容器に添加したところ、水面に浮いて沈むことがなかった。
このフィルム裁断物を磁性流体と接触させるため容器に蓋をして転倒撹拌をしたところ、フィルム裁断物は全て磁性流体に取り込まれてしまい、目視確認できない状態となった。
超親水コート剤(大阪有機化学工業製、LAMBIC−500WP)1gを純水100gに溶解した液をバットに注入し、これに実施例1のフィルムAを浸した。
次いで、バットを105℃に調節した乾燥機に入れて水分を完全に蒸発させた。室温まで冷却後に得られたフィルムCに対する水の接触角を測定したところ5°であった。
上記フィルムCを0.1mm×0.1mmに裁断し、その0.2gを実施例1と同様に磁性流体と純水の入った容器に添加しゆっくりと撹拌したところ、フィルム裁断物は磁性流体と純水の界面に吸着され、磁性流体内部に取り込まれることがなかった。
磁石を接近させスパイクを形成させたところ磁性流体の変形に応じて全ての界面を被覆し、それぞれのスパイクが金属光沢を放つのが観察された。
実施例2の超親水コート剤溶液を純水で10倍に希釈したものに代え、その他は全く同様の操作を行い、超親水コート処理フィルム(フィルムD)を得た。
上記フィルムDに対する水の接触角を測定したところ15°であった。実施例2と同様の操作を行い、フィルム裁断物を磁性流体と純水の入った容器に添加しゆっくりと撹拌したところ、多くは磁性流体と水の界面に吸着されたが一部磁性流体内部に取り込まれてしまうものがあり、視覚的効果が若干劣る結果となった。
市販ラメ材(藤倉応用化学製、赤金ラメ0.1φ)0.2gを実施例2で作成した超親水コート剤溶液10mlに添加し、105℃に調節した乾燥器中で水分を完全に蒸発させた。室温まで冷却した後、ラメ材全量を実施例1と同様に準備した磁性流体と純水を入れたガラス容器に添加したところ、ラメ材は水中に沈み、ゆっくりと撹拌したところ磁性流体と水の界面に吸着した。
容器下方より磁石を近づけスパイクを形成させたところ、スパイク全体が金色光沢を呈した。
例えば、遮光片30については、当該遮光片が油性磁性流体の内部に取り込まれない限り、親水性部位を全表面に設ける必要はなく、表面及び裏面の少なくとも一方でもよいし、さらには、表面又は裏面の一部に設けてもよい。
また、遮光片として樹脂フィルムを基材とする例を示したが、遮光性と油性磁性流体内部に取り込まれない程度の親水性を有すれば、金属薄膜自体を遮光片とすることも可能である。
さらに、遮光片30の親水層31と35の親水性の度合いは、必ずしも同等にする必要はなく異ならせてもよい。親水性の度合いを異ならせることにより、親水性の度合いの強い層を優先的に水10側に配向させることが可能となる。
1s 界面
2 磁性流体コンポジット展示装置
10 水
20 油性磁性流体
30 遮光片
31 親水層
33 遮光層
35 親水層
40 透明容器
41 容器本体
42 蓋
42h 孔部
50 永久磁石
60 捕集部材
Claims (3)
- 水と、油性磁性流体と、親水性部位を有する難磁性遮光片を含有することを特徴とする展示用磁性流体コンポジット。
- 上記難磁性遮光片の親水性部位と水との接触角が15°以下であることを特徴とする請求項1に記載の展示用磁性流体コンポジット。
- 磁性流体のスパイク現象を利用した磁性流体コンポジットの展示装置であって、
請求項1又は2に記載の展示用磁性流体コンポジットと、内部を観察できる観察部位を有する容器と、磁場発生部材を備え、
上記磁場発生部材は、上記容器に収容された上記展示用磁性流体コンポジットに磁力を及ぼす、ことを特徴とする磁性流体コンポジット展示装置。
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JP2016543840A JP6326139B2 (ja) | 2014-08-19 | 2015-05-14 | 展示用磁性流体コンポジット及び磁性流体コンポジット展示装置 |
US15/504,759 US20170316724A1 (en) | 2014-08-19 | 2015-05-14 | Magnetic fluid composite for display use, and magnetic fluid composite display device |
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US (1) | US20170316724A1 (ja) |
JP (1) | JP6326139B2 (ja) |
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CA3056103A1 (en) * | 2016-03-11 | 2017-09-14 | Turtletech Design, Inc. | Magnetic positioning mechanism for fluid-supported self-rotating displays |
EP3770927A1 (en) * | 2019-07-23 | 2021-01-27 | Cartier International AG | Ferrofluid system containing gold particles |
CN114464441B (zh) * | 2021-12-29 | 2024-09-10 | 谷小许 | 一种磁性流动体的加工工艺及其磁性流动体展示装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52156600A (en) * | 1976-06-22 | 1977-12-27 | Matsumoto Yushi Seiyaku Kk | Device for introducing education* advertise or information or displaying toy utilizing magnetic fluid |
JPS582873A (ja) * | 1981-06-29 | 1983-01-08 | 新日曹化工株式会社 | 液体浮遊装置 |
JPH01201293A (ja) * | 1988-02-04 | 1989-08-14 | Sumitomo Cement Co Ltd | 相溶性を有しない液体中の磁性流体の変形、移動を利用した器具類 |
US6290894B1 (en) * | 1999-03-24 | 2001-09-18 | Ferrofluidics Corporation | Ferrofluid sculpting apparatus |
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CA2428135C (en) * | 2002-05-07 | 2011-04-19 | Ermanno Borra | Reflecting mirrors shaped with magnetic fields |
US7525722B2 (en) * | 2006-08-31 | 2009-04-28 | Alcatel-Lucent Usa Inc. | Liquid mirror |
-
2015
- 2015-04-22 KR KR1020150056403A patent/KR20160022227A/ko not_active Application Discontinuation
- 2015-05-14 JP JP2016543840A patent/JP6326139B2/ja active Active
- 2015-05-14 US US15/504,759 patent/US20170316724A1/en not_active Abandoned
- 2015-05-14 WO PCT/JP2015/064547 patent/WO2016027535A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52156600A (en) * | 1976-06-22 | 1977-12-27 | Matsumoto Yushi Seiyaku Kk | Device for introducing education* advertise or information or displaying toy utilizing magnetic fluid |
JPS582873A (ja) * | 1981-06-29 | 1983-01-08 | 新日曹化工株式会社 | 液体浮遊装置 |
JPH01201293A (ja) * | 1988-02-04 | 1989-08-14 | Sumitomo Cement Co Ltd | 相溶性を有しない液体中の磁性流体の変形、移動を利用した器具類 |
US6290894B1 (en) * | 1999-03-24 | 2001-09-18 | Ferrofluidics Corporation | Ferrofluid sculpting apparatus |
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US20170316724A1 (en) | 2017-11-02 |
JP6326139B2 (ja) | 2018-05-16 |
JPWO2016027535A1 (ja) | 2017-06-08 |
KR20160022227A (ko) | 2016-02-29 |
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