WO2011065306A1 - 微小構造体及びその製造方法 - Google Patents
微小構造体及びその製造方法 Download PDFInfo
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- WO2011065306A1 WO2011065306A1 PCT/JP2010/070692 JP2010070692W WO2011065306A1 WO 2011065306 A1 WO2011065306 A1 WO 2011065306A1 JP 2010070692 W JP2010070692 W JP 2010070692W WO 2011065306 A1 WO2011065306 A1 WO 2011065306A1
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- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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Definitions
- the present invention relates to a microstructure and a method for manufacturing the microstructure, and is suitable for application to a microstructure having an oxide containing Ti 3+ (hereinafter simply referred to as titanium oxide), for example.
- Ti 2 O 3 which is representative of titanium oxide, is a phase transition material having various interesting physical properties. For example, it is known that a metal-insulator transition and a paramagnetic-antiferromagnetic transition occur. Ti 2 O 3 is also known for its infrared absorption, thermoelectric effect, magnetoelectric (ME) effect, etc. In addition, in recent years, a magnetoresistive (MR) effect has also been found. Such various physical properties have been studied only in bulk bodies ( ⁇ m size) (see, for example, Non-Patent Document 1), and the mechanism is still unclear.
- MR magnetoresistive
- an object of the present invention is to provide a microstructure capable of expressing a novel physical property that has not existed before and a method for manufacturing the same.
- a precursor powder is generated based on a precipitate precipitated in a mixed solution of a surfactant solution containing a nonionic polymer surfactant and a peroxotitanic acid aqueous solution.
- a surfactant solution containing a nonionic polymer surfactant and a peroxotitanic acid aqueous solution.
- the invention according to claim 2 is characterized in that a silane compound is added to the surfactant solution, and the microstructure is a nanorod structure.
- the invention according to claim 3 includes a solution preparation step of preparing a mixed solution by mixing a surface active solution containing a nonionic polymer surfactant and a peroxotitanic acid aqueous solution, A production step of separating the precipitated precipitate from the mixed solution to produce a precursor powder, and firing the precursor powder in a predetermined hydrogen atmosphere for a predetermined time, thereby forming a microstructure made of Ti 4 O 7. And a firing step to be generated.
- the invention according to claim 4 is characterized in that a silane compound is added to the surface-active solution used in the solution preparation step, and the microstructure formed by the generation step has a nanorod structure. It is.
- microstructure which is made of Ti 4 O 7 and is formed in a novel nano-rod shape that can express novel physical properties and a method for manufacturing the same.
- FIG. 1 shows a photograph of dark blue fired powder 1 composed of a plurality of microstructures 2.
- the microstructure 2 according to the first embodiment is a spherical particle, the particle diameter of which is formed to a nano size of about 25 to 100 nm, and has a composition of Ti 4 O 7 having a magnetic structure.
- the microstructure 2 according to the present invention is characterized in that it can be nano-sized into nano-size unlike a conventionally known oxide bulk body (hereinafter referred to as a conventional crystal). .
- this triblock copolymer 4 has a structure (poly (ethylene oxide) -poly (propylene oxide) -poly (ethylene oxide)) in which hydrophobic poly (propylene oxide) chains are arranged between hydrophilic poly (ethylene oxide) chains.
- trade name Pronic F68 MP Biochemicals [(PEO 80 -PPO 30 -PEO 80 )] ([HO (CH 2 CH 2 O) 80 (CH 2 CH 2 CH 2 O) 30 (CH 2 CH 2 O) 80 H] is used.
- a surface-active solution is added to and mixed with the peroxotitanic acid aqueous solution and stirred at room temperature for a predetermined time to prepare a mixed solution (step SP1). Subsequently, the mixed solution is allowed to stand at room temperature for a predetermined time (step SP2). Then, the solution is heated in a 70 ° C. warm bath to drive off hydrogen peroxide from the solution (step SP2). Thereafter, ethanol is added to the mixed solution to produce a yellow precipitate in the mixed solution (step SP3).
- a precipitate is collected from the mixed solution by centrifugation, washed with ethanol, and then dried (step SP4) to produce a yellow precursor powder 5.
- the precursor powder 5 is baked for several hours at a predetermined temperature in a predetermined hydrogen atmosphere, whereby a nanoparticulate microstructure 2 made of Ti 4 O 7 can be produced.
- triblock copolymer 4 (trade name Pronic F68 (MP Biochemicals) [(PEO 80 -PPO 30 -PEO 80 )]), which is a nonionic polymer surfactant, is added to 2 g of 80 mL of water.
- a surface active solution was prepared by dissolving (0.24 mmol).
- a surface active solution was added to the peroxotitanic acid aqueous solution and mixed by stirring at room temperature for about 2 to 4 hours to prepare a mixed solution (step SP1 in FIG. 2). Subsequently, this mixed solution was allowed to stand at room temperature for about 18 hours (step SP2). Then, the solution was heated in a 70 ° C. warm bath to expel hydrogen peroxide from the solution (step SP2). Thereafter, 60 to 70 ml of ethanol was added to the mixed solution (step SP3). This produced a yellow precipitate in the mixed solution.
- this mixed solution was centrifuged 3 to 4 times at a rotational speed of 4000 rpm for about 5 minutes, and the precipitate was separated and collected. Subsequently, the collected precipitate was washed 3 to 4 times with ethanol and then dried at 60 ° C. for 12 minutes to produce a yellow precursor powder 5.
- TEM Transmission Electron Microscope
- three precursor powders 5 are produced in accordance with this production method, and the precursor powders 5 are heated at temperatures different from 800 ° C., 850 ° C., and 900 ° C. for about 5 hours in a hydrogen atmosphere at a hydrogen flow rate of 3 L / min.
- 4A is a photograph of yellow precursor powder 5 before firing
- FIG. 4B shows dark blue fired powder 1 after firing the precursor powder. It is a photograph taken.
- FIG. 5 (A) is a TEM image of the fired powder 1 obtained when the precursor powder 5 was fired at 800 ° C.
- FIG. 5B is a TEM image of the fired powder 1 obtained when the precursor powder 5 was fired at 850 ° C.
- FIG. 5C is a TEM image of the fired powder 1 obtained when the precursor powder 5 was fired at 900 ° C.
- the microstructure 2 obtained by firing at 800 ° C. has a particle diameter of about 25 nm, and the microstructure 2 obtained by firing at 850 ° C.
- the particle diameter was about 50 nm, and it was confirmed that the microstructure 2 fired at 900 ° C. had a particle diameter of about 100 nm.
- the microstructure 2 has a larger particle diameter as the firing temperature is increased. Therefore, it was found that when the microstructure 2 having a small particle size is produced, it is preferable to lower the temperature at which the precursor powder 5 is fired.
- the calcined powder 1 obtained by calcining the precursor powder 5 at 850 ° C. or 900 ° C. was attributed to Ti 4 O 7 from each XRD pattern as shown in FIG. From this, it was confirmed that the microstructure 2 according to the present invention can be produced in a wide temperature range of 800 to 900 ° C. as the temperature when the precursor powder 5 is fired.
- the microstructure 2 made of single-phase Ti 4 O 7 and formed in a nano size can be manufactured.
- the microstructure 2 made of single-phase Ti 4 O 7 manufactured in this way can be made fine particles down to a nano size and has an unprecedented microstructure.
- FIG. 8 is a SEM (Scanning Electron Microscope) image of the microstructure 21 according to the second embodiment.
- the micro structure 21 is different from the first embodiment in comprising a cylindrical nanorod is different, the number length of about [mu] m, is formed with a diameter of about 100 ⁇ 500 nm, Ti 4 Magneli structure having a composition of O 7.
- the microstructure 21 according to the present invention is characterized in that it is formed in the shape of a nanorod that is miniaturized to a nano size, unlike a conventionally known crystal.
- the microstructure 21 is manufactured by adding a silane compound such as tetraethoxysilane (TEOS ((C 2 H 5 O) 4 Si)) to the surface active solution in the manufacturing process of the first embodiment. Can be done.
- a nanorod-structured microstructure 21 made of single-phase Ti 4 O 7 can be manufactured by the following manufacturing method.
- tetraethoxysilane (TEOS) or the like is added to a solution in which the triblock copolymer 4 which is a nonionic polymer surfactant is dissolved in water (that is, a surfactant solution).
- Silane compound 22 is added.
- the subsequent manufacturing process is the same as that of the first embodiment described above.
- the surfactant solution is added to the peroxotitanic acid aqueous solution and mixed, and the mixed solution is stirred at room temperature for a predetermined time. It is manufactured (step SP11).
- the mixed solution is allowed to stand at room temperature for a predetermined time (step SP12).
- ethanol is added to the mixed solution to produce a yellow precipitate in the mixed solution (step SP13).
- a precipitate is collected from the mixed solution by centrifugation, washed with ethanol, and then dried (step SP14), thereby generating a yellow precursor powder composed of a plurality of precursors 23 formed in a nanorod shape. .
- the precursor powder is fired at a predetermined temperature for several hours under a predetermined hydrogen atmosphere, whereby a nanorod-structured microstructure 21 made of Ti 4 O 7 can be produced.
- triblock copolymer 4 (trade name Pronic F68 (MP Biochemicals) [(PEO 80 -PPO 30 -PEO 80 )]), which is a nonionic polymer surfactant.
- TEOS tetraethoxysilane
- a surface-active solution was added to the peroxotitanic acid aqueous solution and mixed by stirring at room temperature for about 4 hours to prepare a mixed solution (step SP11 in FIG. 9). Subsequently, the mixed solution was allowed to stand at room temperature for about 18 hours (step SP12). Thereafter, 60 to 70 ml of ethanol was added to the mixed solution (step SP13). This produced a yellow precipitate in the mixed solution.
- FIG. 10 is an SEM image of the precursor 23 in the precursor powder
- FIGS. 11A and 11B are TEM images of the precursor 23. From the SEM image of FIG. 10 and the TEM images of FIGS. 11 (A) and 11 (B), each precursor 23 of this precursor powder has a nano size and is formed in a rod shape (cylindrical shape). It could be confirmed.
- three precursor powders are produced according to this manufacturing method, and the precursor powders are fired at temperatures different from 800 ° C., 850 ° C., and 900 ° C. for about 5 hours in a hydrogen atmosphere at a hydrogen flow rate of 3 L / min. Three fired powders were produced.
- FIG. 12A is a TEM image of the microstructure 21 obtained when the precursor powder is fired at 800 ° C.
- FIG. 12B is a TEM image of the microstructure 21 obtained when the precursor powder is fired at 850 ° C.
- FIG. 12C is a TEM image of the microstructure 21 obtained when the precursor powder is fired at 900 ° C. From these TEM images of FIGS. 12A, 12B and 12C, the rod-like shape of the precursor 23 is maintained even if the precursor powder is fired at 800 ° C., 850 ° C. or 900 ° C. Was confirmed.
- the microstructure 21 was formed to have a nanorod structure having a length of about several ⁇ m and a diameter of about 100 to 500 nm.
- FIG. 8 described above is an SEM image of the microstructure 21 obtained when the precursor powder is fired at 850 ° C.
- the fired powder obtained by firing the precursor powder at 850 ° C. or 900 ° C. was attributed to Ti 4 O 7 from each XRD pattern as shown in FIG. Further, from this, it was confirmed that the microstructure 21 according to the present invention can be generated in a wide temperature range of 800 to 900 ° C. as the temperature when the precursor powder is fired.
- a surface active solution to which a silane compound 22 such as tetraethoxysilane (TEOS) is added is used as an aqueous peroxotitanate solution.
- TEOS tetraethoxysilane
- ethanol is added to generate a precipitate, and the precipitate collected from the mixed solution is dried to generate a precursor 23.
- the precursor 23 is fired at a predetermined temperature. .
- the microstructure 21 made of single-phase Ti 4 O 7 and formed in a rod shape with a nano size can be manufactured.
- the microstructure 21 made of single-phase Ti 4 O 7 manufactured in this way has a nanorod structure that has been miniaturized to a nano size and an unprecedented microstructure.
- this invention is not limited to this embodiment, For example, it is the range of the summary of this invention about the standing time of the mixed solution in step SP2 and step SP12, the temperature which bakes precursor powder, baking time, etc. Various modifications are possible within the above.
Abstract
Description
3 ペルオキソチタン酸錯体
4 トリブロックコポリマー
22 シラン化合物
(1-1)第1の実施の形態による微小構造体の構成
図1は、複数の微小構造体2からなる暗青色の焼成粉末1の写真を示す。第1の実施の形態による微小構造体2は、球状の粒子であり、その粒子径が約25~100nm程度のナノサイズに形成され、マグネリ構造のTi4O7の組成を有する。本発明による微小構造体2は、従来から知られている酸化物のバルク体(以下、これを従来結晶と呼ぶ)と異なり、ナノサイズにまでナノ微粒子化できた点に特徴を有している。
具体的には、先ず始めに、Ti粉末にH2O2とアンモニア水とを加え、黄色透明な(NH4)[Ti(O2)(OH)3]の溶液(以下、これをペルオキソチタン酸水溶液と呼ぶ)が得られるまで撹拌する。このペルオキソチタン酸水溶液内には、図2に示すようなペルオキソチタン酸錯体([Ti(O2)(OH)3]-)3が生成され得る。
上述した製造方法に従って具体的に作製した本発明による微小構造体2について、種々の検証試験を行った。先ず始めに、この検証試験に用いる微小構造体2の具体的な製造方法を説明した後、各検証結果について説明する。
先ず始めに下記の数1に示すように、2.0g(42(mmol)のTi粉末に、160mLの30%H2O2と、40mLの28%アンモニア水(NH3水溶液)とを加えた後、氷浴中(0~5℃)で約2時間撹拌することにより、ペルオキソチタン酸錯体([Ti(O2)(OH)3]-)3を含有した黄色透明なペルオキソチタン酸水溶液を作製した。
次に、これら3つの焼成粉末1についてTEM像を確認した。図5(A)は、前駆体粉末5を800℃で焼成したときに得られた焼成粉末1のTEM像である。図5(B)は、前駆体粉末5を850℃で焼成したときに得られた焼成粉末1のTEM像である。図5(C)は、前駆体粉末5を900℃で焼成したときに得られた焼成粉末1のTEM像である。
次に、上述した800℃、850℃及び900℃で前駆体粉末5を焼成することで生成された3つの焼成粉末1の可視光吸収スペクトルをそれぞれ測定したところ、図7に示すような結果が得られた。なお、ここでは、各焼成粉末1の反射率Rを分光測色計で測定し、その測定結果である反射率Rを用いてクベルカ・ムンク(Kubelka-Munk)式により算出値を求め、その算出値を図7の縦軸に示した。なお、クベルカ・ムンク式は、Kubelka-Munk function/au=(1-R)2/2Rで表され、試料の光吸収を拡散反射光より求める式である。この図7の結果から、各焼成粉末1では、650nm付近にTiIIIのd-d遷移(2B2g→ 2A1g,2B1g)が確認された。
以上の構成において、本発明による製造方法では、ペルオキソチタン酸水溶液に界面活性溶液を加えて作製した混合溶液にエタノールを加えて沈殿物を生成して、混合溶液から採取した沈殿物を乾燥させることにより前駆体粉末5を生成し、この前駆体粉末5を所定温度で焼成処理する。
(2-1)第2の実施の形態による微小構造体の構成
図8は第2の実施の形態による微小構造体21のSEM(Scanning Electron Microscope)像である。この微小構造体21は、円筒状のナノロッドからなる点で第1の実施の形態とは相違しており、長さが約数μm、直径が約100~500nmに形成され、マグネリ構造のTi4O7の組成を有する。本発明による微小構造体21は、従来から知られている従来結晶と異なり、ナノサイズにまで微小化したナノロッド状に形成されている点に特徴を有している。
先ず始めに、Ti粉末にH2O2とアンモニア水とを加え、黄色透明な(NH4)[Ti(O2)(OH)3]の溶液(すなわち、ペルオキソチタン酸水溶液)が得られるまで撹拌する。このペルオキソチタン酸水溶液内には、図9に示すようなペルオキソチタン酸錯体([Ti(O2)(OH)3]-)3が生成され得る。
上述した製造方法に従って具体的に作製した第2の実施の形態による微小構造体21について、種々の検証試験を行った。先ず始めに、この検証試験に用いる微小構造体1の具体的な製造方法を説明した後、各検証結果について説明する。
この場合、先ず始めに上述した数1に示すように、2.0g(42(mmol)のTi粉末に、160mLの30%H2O2と、40mLの28%アンモニア水とを加えた後、氷浴中(0~5℃)で約2時間撹拌することにより、ペルオキソチタン酸錯体([Ti(O2)(OH)3]-)3を含有した黄色透明なペルオキソチタン酸水溶液を作製した。
次に、これら3つの焼成粉末についてTEM像を確認した。図12(A)は、前駆体粉末を800℃で焼成したときに得られた微小構造体21のTEM像である。図12(B)は、前駆体粉末を850℃で焼成したときに得られた微小構造体21のTEM像である。図12(C)は、前駆体粉末を900℃で焼成したときに得られた微小構造体21のTEM像である。これら図12(A)、(B)及び(C)のTEM像から、800℃、850℃又は900℃で前駆体粉末を焼成しても、前駆体23のロッド状の形状が保たれることが確認できた。また、この微小構造体21は、長さが約数μm、直径が約100~500nmに形成されており、ナノロッド構造を有することが確認できた。因みに、上述した図8は前駆体粉末を850℃で焼成したときに得られた微小構造体21のSEM像である。
次に、上述した850℃及び900℃で前駆体粉末5を焼成することで生成された3つの焼成粉末の可視光吸収スペクトルをそれぞれ測定したところ、図14に示すような結果が得られた。なお、ここでは、上述した第1の実施の形態と同様に、各焼成粉末の反射率Rを分光測色計で測定し、その測定結果である反射率Rを用いてクベルカ・ムンク(Kubelka-Munk)式により算出値を求め、その算出値を図14の縦軸に示した。この図14の結果から、各焼成粉末では、650nm付近にTiIIIのd-d遷移(2B2g→ 2A1g,2B1g)が確認された。
以上の構成において、本発明による第2の実施の形態における製造方法では、テトラエトキシシラン(TEOS)等のシラン化合物22を添加した界面活性溶液を、ペルオキソチタン酸水溶液に加えて作製した混合溶液に、エタノールを加えて沈殿物を生成して、混合溶液から採取した沈殿物を乾燥させることにより前駆体23を生成し、この前駆体23を所定温度で焼成処理する。
Claims (4)
- 非イオン性ポリマー界面活性剤を含有した界面活性溶液と、ペルオキソチタン酸水溶液との混合溶液に沈殿した沈殿物を基に前駆体粉末が生成され、この前駆体粉末が焼成されることにより生成されたTi4O7からなるナノサイズの微小構造を有する
ことを特徴とする微小構造体。 - 前記界面活性溶液にはシラン化合物が添加され、
前記微小構造がナノロッド構造である
ことを特徴とする請求項1記載の微小構造体。 - 非イオン性ポリマー界面活性剤を含有した界面活性溶液と、ペルオキソチタン酸水溶液とを混合することにより混合溶液を作製する溶液作製工程と、
前記混合溶液内に沈殿した沈殿物を前記混合溶液から分離して前駆体粉末を生成する生成工程と、
前記前駆体粉末を所定の水素雰囲気下で所定時間焼成することにより、Ti4O7からなる微小構造体を生成する焼成工程と
を備えることを特徴とする微小構造体の製造方法。 - 前記溶液作製工程で用いる前記界面活性溶液にはシラン化合物を添加し、
前記生成工程により生成される前記微小構造体がナノロッド構造を有する
ことを特徴とする請求項3記載の微小構造体の製造方法。
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Cited By (2)
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CN104661962A (zh) * | 2012-09-28 | 2015-05-27 | 欧洲技术研究圣戈班中心 | 亚氧化钛的熔体颗粒和包含这种颗粒的陶瓷产品 |
WO2017043449A1 (ja) * | 2015-09-07 | 2017-03-16 | 国立大学法人東京大学 | 酸化チタン凝集体、酸化チタン凝集体の製造方法、酸化チタン粉末体、酸化チタン成形体、電池電極用触媒、電池電極用導電材及びマイクロ波・ミリ波用誘電体 |
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CN106277042B (zh) * | 2016-08-29 | 2017-08-25 | 湖南科莱新材料有限公司 | 一种制备Ti4O7的方法 |
KR20190084949A (ko) * | 2016-11-22 | 2019-07-17 | 사카이 가가쿠 고교 가부시키가이샤 | 전극 재료 및 그 제조 방법 |
CN114874008B (zh) * | 2022-04-24 | 2023-08-18 | 昆明理工大学 | 一种YTaO4/Y3TaO7双相陶瓷及其制备方法与应用 |
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WO2009024776A1 (en) * | 2007-08-23 | 2009-02-26 | Atraverda Limited | Powders |
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JP2005538921A (ja) * | 2002-09-17 | 2005-12-22 | スリーエム イノベイティブ プロパティズ カンパニー | ポーラスな界面活性剤媒介金属酸化物フィルム |
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Cited By (3)
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CN104661962A (zh) * | 2012-09-28 | 2015-05-27 | 欧洲技术研究圣戈班中心 | 亚氧化钛的熔体颗粒和包含这种颗粒的陶瓷产品 |
WO2017043449A1 (ja) * | 2015-09-07 | 2017-03-16 | 国立大学法人東京大学 | 酸化チタン凝集体、酸化チタン凝集体の製造方法、酸化チタン粉末体、酸化チタン成形体、電池電極用触媒、電池電極用導電材及びマイクロ波・ミリ波用誘電体 |
JP2017052659A (ja) * | 2015-09-07 | 2017-03-16 | 国立大学法人 東京大学 | 酸化チタン凝集体、酸化チタン凝集体の製造方法、酸化チタン粉末体、酸化チタン成形体、電池電極用触媒、電池電極用導電材及びマイクロ波・ミリ波用誘電体 |
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US20120275990A1 (en) | 2012-11-01 |
JPWO2011065306A1 (ja) | 2013-04-11 |
JP5419049B2 (ja) | 2014-02-19 |
US9005569B2 (en) | 2015-04-14 |
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