JP3890409B2 - Aggregates of nanofibrous boric acid and method for producing the same - Google Patents
Aggregates of nanofibrous boric acid and method for producing the same Download PDFInfo
- Publication number
- JP3890409B2 JP3890409B2 JP2002380789A JP2002380789A JP3890409B2 JP 3890409 B2 JP3890409 B2 JP 3890409B2 JP 2002380789 A JP2002380789 A JP 2002380789A JP 2002380789 A JP2002380789 A JP 2002380789A JP 3890409 B2 JP3890409 B2 JP 3890409B2
- Authority
- JP
- Japan
- Prior art keywords
- boric acid
- nanofibrous
- aggregate
- producing
- trimethyl borate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Description
【０００１】
【発明の属する技術分野】
この出願の発明は、ナノファイバー状ホウ酸の集合体とその製造方法に関するものである。さらに詳しくは、この出願の発明は、変容しにくく、比較的安定なナノファイバー状ホウ酸の集合体とこれを簡便に得ることのできる製造方法に関するものである。
【０００２】
【従来の技術】
炭素ナノチューブが発見されて以来、多くの一次元ナノスケール物質が合成されている。ナノチューブ構造の物質としては窒化ホウ素（ＢＮ）等、ナノロッド又はナノワイヤー構造の物質としては酸化マグネシウム（ＭｇＯ）、窒化ガリウム（ＧａＮ）等が合成されている。
【０００３】
ところで、ホウ素とその化合物は、強磁性体、超伝導材料、高強度材料、触媒、生物化学等の広範な分野に適用可能な優れた特性を有し、無機化学及び材料の開発においては重要な位置を占める物質である。その一つとしてのホウ酸は、たとえば滑剤（たとえば、非特許文献１参照）、抗菌剤（たとえば、非特許文献２参照）、癌細胞を選択的に破壊又は弱体化させることのできる医薬（たとえば、非特許文献３参照）等に広く応用されている。また、ホウ酸とその誘導体は、すべての動物組織に必要な構成成分であり、このことからホウ酸の潜在的価値が注目されている。
【０００４】
【非特許文献１】
ジャーナル・オブ・マテリアルズ・リサーチ（J. Mater. Res.），1999年，第１４巻，ｐ．3455
【非特許文献２】
アンナーレン・デア・ヘミー（Ann. Chem.），1994年，第３巻，ｐ．283
【非特許文献３】
ジャーナル・オブ・ファーマシューティカル・アンド・バイオメディカル・アナリシス（J. Pharmaceut. Biomed.），1998年，第１７巻，ｐ．427
【０００５】
【発明が解決しようとする課題】
しかしながら、ホウ酸とその誘導体に関し、変容しなく、安定した形態を有するナノスケール状の物質はこれまでに提供されていない。
【０００６】
この出願の発明は、このような事情に鑑みてなされたものであり、変容しにくく、比較的安定なナノファイバー状ホウ酸の集合体とこれを簡便に得ることのできる製造方法を提供することを課題としている。
【０００７】
【課題を解決するための手段】
この出願の発明は、上記の課題を解決するものとして、第１には、直径がナノメートルサイズのファイバー状の正ホウ酸（Ｂ（ＯＨ）３）が凝集して網状形態を有していることを特徴とするナノファイバー状ホウ酸の集合体を提供する。
【０００８】
この出願の発明は、第２には、ホウ素酸化物（Ｂ2Ｏ3）とメタノール（ＭｅＯＨ）を反応させてエステル化させ、ホウ酸トリメチルを生成させた後、室温でホウ酸トリメチルの蒸気に蒸留水を噴霧し、加水分解させてホウ酸のウィスカーを生成させ、次いでそのウィスカーに希塩酸水溶液を噴霧することを特徴とするナノファイバー状ホウ酸の集合体の製造方法を提供する。
【０００９】
以下、実施例を示しつつ、この出願の発明のナノファイバー状ホウ酸の集合体とその製造方法についてさらに詳しく説明する。
【００１０】
【発明の実施の形態】
この出願の発明のナノファイバー状ホウ酸の集合体は、直径が数nm〜数十nmの範囲にあるファイバー状の正ホウ酸（Ｂ（ＯＨ）3）が凝集して網状形態を有するものである。集合体を構成するナノファイバー状ホウ酸は、極性の水素結合を持つため、強い相互作用を有する。したがって、形態保持力を有しており、比較的安定な物質である。
【００１１】
ナノファイバー状ホウ酸の集合体は、この出願の発明では、ホウ素酸化物（Ｂ2Ｏ3）とメタノール（ＭｅＯＨ）を反応させてエステル化させ、ホウ酸トリメチルを生成させた後、室温でホウ酸トリメチルの蒸気に蒸留水を噴霧し、加水分解させてホウ酸のウィスカーを生成させ、次いでそのウィスカーに希塩酸水溶液を噴霧することにより得られる。ナノファイバー状ホウ酸の集合体は、噴霧する希塩酸水溶液のｐＨを制御することにより、ミクロ導管、樹木状運動筋肉抹消、筋肉組織にそれぞれ類似した三種類の網状形態を有する。この場合の希塩酸水溶液のｐＨは、2.5〜4.5の範囲が好ましい。これにより、ホウ酸トリメチルの過度の加水分解が抑制される。
【００１２】
【実施例】
ホウ素酸化物（Ｂ2Ｏ3）１モルとメタノール（ＭｅＯＨ）5.7モルを反応させてエステル化させ、ホウ酸トリメチル（Ｂ（ＯＭＥ）3）を生成させた。このホウ酸トリメチルを蓋を取り付けていない反応容器に入れ、室温２７℃、湿度５０％の条件でホウ酸トリメチルの揮発蒸気に蒸留水を噴霧し、加水分解させ、ホウ酸のウィスカーを得た。そして、このウィスカーに0.05モルの希塩酸水溶液を噴霧した。その結果、図１に示したようなマッシュルーム状の集合体が生成した。Ｘ線回折の結果、生成物は正ホウ酸（Ｂ（ＯＨ）3）であることが確認された。走査型電子顕微鏡を用いた観察により、生成物は、直径数nm〜数十nmの範囲にあるファイバー状であることが確認された。得られたこのナノファイバー状ホウ酸は、極性の水素結合を持っているため、強い相互作用があり、したがって、形態保持力を有し、比較的安定な物質である。
【００１３】
ナノファイバー状ホウ酸の集合体は、噴霧する希塩酸水溶液のｐＨにより大別して三種類の網状形態を有する。一つは、図２（ａ）に示したミクロ導管に類似した形態であり、これは、希塩酸水溶液のｐＨが2.8程度で得られた。もう一つは、図２（ｂ）に示した樹木状運動筋肉抹消に類似した形態であり、希塩酸水溶液のｐＨが3.2程度で得られた。残る一つは、図２（ｃ）に示した筋肉組織に類似した形態であり、希塩酸水溶液のｐＨが3.4程度で得られた。
【００１４】
なお、容器内のホウ酸トリメチルには、少量の塩化アルミニウム（ＡｌＣｌ3）を添加することにより容器内の加水分解が抑制された。
【００１５】
もちろん、この出願の発明は、以上の実施形態及び実施例によって限定されるものではない。細部については様々な態様が可能であることはいうまでもない。
【００１６】
【発明の効果】
以上詳しく説明した通り、この出願の発明によって、変容しにくく、安定なナノファイバー状ホウ酸の集合体とこれを簡便に得ることのできる製造方法が提供される。
【図面の簡単な説明】
【図１】 実施例で得られたマッシュルーム状の集合体を示した写真である。
【図２】 （ａ）（ｂ）（ｃ）は、それぞれ、ナノファイバー状ホウ酸の集合体の網状形態を示した透過型電子顕微鏡（ＴＥＭ）像である。[0001]
BACKGROUND OF THE INVENTION
The invention of this application relates to an assembly of nanofibrous boric acid and a method for producing the same. More specifically, the invention of this application relates to a nanofiber-like boric acid aggregate that is difficult to transform and is relatively stable, and a production method that can easily obtain this.
[0002]
[Prior art]
Since the discovery of carbon nanotubes, many one-dimensional nanoscale materials have been synthesized. Boron nitride (BN) or the like is synthesized as the nanotube structure material, and magnesium oxide (MgO), gallium nitride (GaN) or the like is synthesized as the nanorod or nanowire structure material.
[0003]
By the way, boron and its compounds have excellent characteristics applicable to a wide range of fields such as ferromagnets, superconducting materials, high-strength materials, catalysts and biochemistry, and are important in the development of inorganic chemistry and materials. A material that occupies a position. Boric acid as one of them is, for example, a lubricant (see, for example, Non-patent Document 1), an antibacterial agent (see, for example, Non-Patent Document 2), and a medicine that can selectively destroy or weaken cancer cells (for example, , See Non-Patent Document 3). In addition, boric acid and its derivatives are necessary constituents for all animal tissues, and thus the potential value of boric acid has attracted attention.
[0004]
[Non-Patent Document 1]
Journal of Materials Research (J. Mater. Res.), 1999, Vol. 14, p. 3455
[Non-Patent Document 2]
Annan der Hemy (Ann. Chem.), 1994, Volume 3, p. 283
[Non-Patent Document 3]
Journal of Pharmaceutical and Biomedical Analysis (J. Pharmaceut. Biomed.), 1998, Vol. 17, p. 427
[0005]
[Problems to be solved by the invention]
However, no nanoscale substances having a stable form with respect to boric acid and its derivatives have been provided so far.
[0006]
The invention of this application has been made in view of such circumstances, and provides a nanofiber-like boric acid aggregate that is difficult to be transformed and is relatively stable, and a production method that can easily obtain this. Is an issue.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the invention of this application first has a net-like form in which fiber-like normal boric acid (B (OH) 3 ) having a diameter of nanometer size is aggregated. An aggregate of nanofibrous boric acid is provided.
[0008]
Secondly, the invention of this application is to react boron oxide (B 2 O 3 ) with methanol (MeOH) to produce trimethyl borate, which is then converted into trimethyl borate vapor at room temperature. There is provided a method for producing an aggregate of nanofibrous boric acid, characterized by spraying distilled water and hydrolyzing it to produce boric acid whiskers, and then spraying the whisker with a dilute aqueous hydrochloric acid solution.
[0009]
Hereinafter, the nanofiber boric acid aggregate of the invention of this application and the production method thereof will be described in more detail with reference to Examples.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The aggregate of nanofibrous boric acid of the invention of this application has a network form in which fibrous normal boric acid (B (OH) 3 ) having a diameter in the range of several nanometers to several tens of nanometers aggregates. is there. The nanofibrous boric acid constituting the aggregate has a strong interaction because it has a polar hydrogen bond. Therefore, it has a form retention force and is a relatively stable substance.
[0011]
In the invention of this application, the nanofiber boric acid aggregate is formed by reacting boron oxide (B 2 O 3 ) with methanol (MeOH) to produce trimethyl borate, and then at room temperature. It is obtained by spraying distilled water onto the vapor of trimethyl acid, hydrolyzing it to produce boric acid whiskers, and then spraying the whisker with a dilute aqueous hydrochloric acid solution. The aggregate of nanofibrous boric acid has three types of reticulated forms similar to microconduit, dendritic exercise muscle extermination, and muscle tissue, respectively, by controlling the pH of the dilute hydrochloric acid aqueous solution to be sprayed. In this case, the pH of the dilute hydrochloric acid aqueous solution is preferably in the range of 2.5 to 4.5. Thereby, excessive hydrolysis of trimethyl borate is suppressed.
[0012]
【Example】
1 mol of boron oxide (B 2 O 3 ) and 5.7 mol of methanol (MeOH) were reacted to produce trimethyl borate (B (OME) 3 ). The trimethyl borate was put in a reaction vessel without a lid, and distilled water was sprayed on the volatile vapor of trimethyl borate under conditions of room temperature 27 ° C. and humidity 50% to hydrolyze to obtain boric acid whiskers. Then, 0.05 mol of dilute hydrochloric acid aqueous solution was sprayed on the whiskers. As a result, a mushroom-like aggregate as shown in FIG. 1 was generated. As a result of X-ray diffraction, it was confirmed that the product was normal boric acid (B (OH) 3 ). Observation using a scanning electron microscope confirmed that the product was in the form of a fiber having a diameter in the range of several nanometers to several tens of nanometers. Since the obtained nanofibrous boric acid has a polar hydrogen bond, it has a strong interaction, and thus has a shape retention force and is a relatively stable substance.
[0013]
The aggregate of nanofibrous boric acid is roughly classified into three types according to the pH of the dilute hydrochloric acid aqueous solution to be sprayed. One is a form similar to the microconduit shown in FIG. 2A, which was obtained when the pH of the dilute hydrochloric acid aqueous solution was about 2.8. The other was a form similar to the dendritic motor muscle extinction shown in FIG. 2 (b), and the pH of the dilute hydrochloric acid aqueous solution was obtained at about 3.2. The remaining one has a form similar to the muscle tissue shown in FIG. 2 (c), and the pH of the diluted hydrochloric acid aqueous solution was obtained at about 3.4.
[0014]
In addition, hydrolysis in the container was suppressed by adding a small amount of aluminum chloride (AlCl 3 ) to trimethyl borate in the container.
[0015]
Of course, the invention of this application is not limited by the above embodiments and examples. Needless to say, various details are possible.
[0016]
【The invention's effect】
As described above in detail, the invention of this application provides a stable nanofiber-like boric acid aggregate which is difficult to be transformed and a production method capable of easily obtaining this.
[Brief description of the drawings]
FIG. 1 is a photograph showing a mushroom-like assembly obtained in an example.
FIGS. 2A, 2B, and 2C are transmission electron microscope (TEM) images each showing a network form of an aggregate of nanofiber boric acid.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002380789A JP3890409B2 (en) | 2002-12-27 | 2002-12-27 | Aggregates of nanofibrous boric acid and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002380789A JP3890409B2 (en) | 2002-12-27 | 2002-12-27 | Aggregates of nanofibrous boric acid and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004210578A JP2004210578A (en) | 2004-07-29 |
| JP3890409B2 true JP3890409B2 (en) | 2007-03-07 |
Family
ID=32816915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002380789A Expired - Lifetime JP3890409B2 (en) | 2002-12-27 | 2002-12-27 | Aggregates of nanofibrous boric acid and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3890409B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7531892B2 (en) * | 2003-12-11 | 2009-05-12 | Yale University | Superconducting boron nanostructures |
| CN103130235B (en) * | 2013-03-22 | 2015-03-04 | 天津大学 | Method for preparing boron-10 acid through boron trifluoride-10 one-step method |
-
2002
- 2002-12-27 JP JP2002380789A patent/JP3890409B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004210578A (en) | 2004-07-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zayyoun et al. | The effect of pH on the synthesis of stable Cu 2 O/CuO nanoparticles by sol–gel method in a glycolic medium | |
| Zhang et al. | A mild and efficient biomimetic synthesis of rodlike hydroxyapatite particles with a high aspect ratio using polyvinylpyrrolidone as capping agent | |
| Liu et al. | A simple route to hydroxyapatite nanofibers | |
| Lun et al. | Enhancing dispersion of halloysite nanotubes via chemical modification | |
| Sailaja Prasannakumaran Nair et al. | Green synthesized luminescent carbon nanodots for the sensing application of Fe3+ ions | |
| WO2012163078A1 (en) | Near-infrared silver sulfide quantum dot, preparation method therefor and biological application thereof | |
| Lu et al. | Preparation of plate-like nano α-Al2O3 using nano-aluminum seeds by wet-chemical methods | |
| Salarian et al. | Template-directed hydrothermal synthesis of dandelion-like hydroxyapatite in the presence of cetyltrimethylammonium bromide and polyethylene glycol | |
| Xia et al. | Small molecule-assisted exfoliation of layered zirconium phosphate nanoplatelets by ionic liquids | |
| JP3890409B2 (en) | Aggregates of nanofibrous boric acid and method for producing the same | |
| CN102874820A (en) | Method for preparing cellular silicon dioxide nanotubes | |
| Barman | Review on biocompatibility of ZnO nano particles | |
| Li et al. | Controllable growth of ZnO nanowhiskers by a simple solution route | |
| Wu et al. | Template route to chemically engineering cavities at nanoscale: a case study of Zn (OH) 2 template | |
| Bahari et al. | Nanostructured features and antimicrobial properties of Fe3O4/ZnO Nanocomposites | |
| Baby et al. | Enhanced luminescence of silver nanoparticles decorated on hydrothermally synthesized exfoliated MoS2 nanosheets | |
| US20200231459A1 (en) | Compositions of metal oxide semiconductor nanomaterials | |
| Qian et al. | Controlled synthesis of light rare-earth hydroxide nanorods via a simple solution route | |
| Fricke et al. | Miniemulsion-based process for controlling the size and shape of zinc oxide nanoparticles | |
| Arumugam et al. | Biodegradable dendrimer functionalized carbon nanotube-hybrids for biomedical applications | |
| Jin et al. | Nano-ZnO/ZnO–HAPw prepared via sol–gel method and antibacterial activities of inorganic agents on six bacteria associated with oral infections | |
| Li et al. | A novel hydrothermal route to the synthesis of xonotlite nanofibers and investigation on their bioactivity | |
| Wszelaka-Rylik | Thermodynamics of β-cyclodextrin–ephedrine inclusion complex formation and covering of nanometric calcite with these substances | |
| Evdokimova et al. | Preparation of hybrid nanocomposites based on nanoscale cellulose and magnetic nanoparticles with photocatalytic properties | |
| He et al. | Nanoscale control of silks for regular hydroxyapatite formation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060425 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20060801 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20060919 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20061107 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 3890409 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| EXPY | Cancellation because of completion of term |