JP6068334B2 - カーボンナノ材料製造装置及びその利用 - Google Patents
カーボンナノ材料製造装置及びその利用 Download PDFInfo
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- JP6068334B2 JP6068334B2 JP2013509989A JP2013509989A JP6068334B2 JP 6068334 B2 JP6068334 B2 JP 6068334B2 JP 2013509989 A JP2013509989 A JP 2013509989A JP 2013509989 A JP2013509989 A JP 2013509989A JP 6068334 B2 JP6068334 B2 JP 6068334B2
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/16—Preparation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
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Description
少なくとも一部が水性媒体に浸漬される陰極と、
前記陰極の前記水性媒体に浸漬される部位に対向状に前記水性媒体中において間隔を隔てて配置される陽極と、
前記陰極と前記陽極の間に不活性ガスを導入して不活性ガスキャビティを形成する機構と、
前記陰極と前記陽極との間にアーク放電発生領域を形成可能に電圧を印加する機構と、
前記アーク放電発生領域に準備された炭素材料から合成された前記カーボンナノ材料を回収する機構と、を備えることができる。
水性媒体中の陰極と陽極との間に不活性ガスを導入して前記水性媒体中に形成した不活性ガスキャビティにおいて、アーク放電を発生させて当該前記不活性ガスキャビティに準備された炭素材料から炭素蒸気を発生させて前記カーボンナノ材料を合成する工程と、
前記カーボンナノ材料を回収する工程と、
を備えることができる。
本明細書に開示されるカーボンナノ粒子の製造装置2は、ア−ク放電を発生させてカーボンナノ材料を生用する生成ユニット4と、生成したカーボンナノ材料を回収する回収ユニット60とを備えている。
図1に示すように、カーボンナノ材料生成ユニット4は、不活性ガスを陰極24と炭素陽極22との間の電極間に導入した状態でこの領域に電圧を印加して水性媒体Wに近接させた状態でアーク放電発生領域30を形成するユニットである。生成ユニット4は、水性媒体槽10と、その内部のアーク放電生成部20とを備えている。
図1に示すように、水性媒体槽10は、アーク放電生成部20を内包して、炭素蒸気の冷却媒として機能する所要量の水性媒体Wを収容できる槽として構成されている。
アーク放電生成部20は、通電可能な黒鉛陽極22と陰極24とを、これらの間の隙間に不活性ガスを導入可能に備えている。黒鉛陽極22を電源26の+極に接続し、陰極24を電源26の−極に接続することによって、黒鉛陽極22と陰極24との間に電圧を印加することができる。このときの電極間にかかる電位差によって電極間に存在する気体に絶縁破壊が生じ、電極間にアーク放電を生じさせることができる。黒鉛陽極22を用いることで、電極と炭素材料を一体化することができるため、装置構成を簡易に設計することができる。
ガス流通部40は、図1に示すように、隙間Sに不活性ガスを導入して、電極間に電圧印加時に水性媒体中にアーク放電発生領域30となる不活性ガスキャビティをその場形成することができる。また、ガス流通部40は、アーク放電発生領域30で生成した炭素蒸気やカーボンナノ材料を水性媒体Wと接触させて冷却し水性媒体側に移動させるキャリアとなる不活性ガスを供給することができる。
回収ユニット60は、水性媒体Wの液相、水性媒体W上の気相及び水性媒体Wの液面のいずれかからカーボンナノ材料を回収することができる。図1に示す装置2においては、3種類の回収手段62、64、66を備えている。第1の回収手段62は、水性媒W体上の気相を回収して、当該気相に含まれるカーボンナノ材料を回収する手段である。気相を回収するには、水性媒体上のガスをポンプ等で吸引して、ガス中の固形分を回収する手段が挙げられる。こうした回収手段62としては、集塵機、エアセパレータ、サイクロン等の乾式分級装置が挙げられる。カーボンナノ材料は、一般に導電性を有しているので静電的回収法が有利であるが、本製造装置2においては、フィルター等による回収が有効である。
本発明によれば、本製造装置を用いることで、以下の工程を有するカーボンナノ材料の製造方法が提供される。すなわち、本発明のカーボンナノ材料の製造方法は、水性媒体中の陰極と陽極との間に不活性ガスを導入して水性媒体W中に形成した不活性ガスキャビティにおいて、アーク放電を発生させて当該前活性ガスキャビティに準備された炭素材料から炭素蒸気を発生させてカーボンナノ材料を合成する工程と、カーボンナノ材料を回収する工程と、を備えることができる。本製造方法によれば、陽極と陰極との間に不活性ガスを導入してガス流により水性媒体中に不活性ガスキャビティをその場形成し、この不活性ガスキャビティにおいてアーク放電を発生させることにより、効率的にカーボンナノ材料を合成することができる。
本発明の製造方法によれば、新規なカーボンナノ材料が提供される。理論的に必ずしも明らかではないが、水性媒体中においてその場形成した不活性ガスキャビティでアーク放電の発生を経て炭素材料から得られるカーボンナノ材料は、従来のカーボンナノチューブなどに代表されるカーボンナノ材料と共通する性質のほか異なる特性を有している。
スチールゲージブロック:長さ4mm(重さ8g)、5mm(同10g)、10mm(同21g)、20mm(同49g)及び30mm(同73g)、ステンレススティール×90CrMoV18、表面硬度56HRC、Rz=0.1μm
スチールベース:ステンレススティール×90CrMoV18、表面硬度56HRC、Rz=0.1μm
ばね測定器:1〜8g/1〜40N(Correx)
力センサー:Transcal 7280(〜 20N)(Burster)
デジタル計量器:Maul社製デジタル計量器
ペルトメーター:粗さ及びトポグラフィー測定(Mahr)
ゲージブロックの重さをデジタル計量器で測定し、その後、ゲージブロック及びスチールベースの表面粗さをペルトメーターで測定し、その後、スチールベースの乾燥表面における摩擦力をばね測定器で測定した。さらに、スチールベース上にカーボンナノホーンを散布し、ゲージブロックを載置して、力センサーで摩擦力FRを測定した。以下の式(1)、ゲージブロックの重さ及び計測した摩擦力FRを用いて摩擦係数μを求めた。結果を表2に示す。
本カーボンナノ材料は、CNHは低周波数から高域帯周波数(GHzオーダー)までの電磁波を吸収することから放射線の吸収について評価した。なお、評価に用いたカーボンナノ材料は、実施例1で作製した泡状体のカーボンナノホーンを用いた。
(1)試験試料(実施例フィルター)の作製
不織布に対しカーボンナノホーンを単位当たり14.4g/m2で塗布して、カーボンナノホーンフィルター(実施例フィルター)を準備した。なお、対照フィルターを、カーボンナノホーンを塗布しない不織布とした。
(2)試験方法
空間放射線(平均値2.31μSv/h(上限3.07μSV/h、下限1.55μSv/h)が検出される環境下で、別に準備した開閉可能な蓋付きの鉛箱を用いて、鉛箱内外の放射線量(α線、γ線、β線の合計)を放射線量測定器(ケニス社製、No121-415 簡易放射能検知器)で計測した。
まず、鉛箱の外部近傍で3分間放射線量を測定し、その後、鉛箱の蓋を外した状態で、鉛箱の中に放射線量測定器を載置して3分間放射線量を測定した。
次いで、鉛箱の外部近傍で3分間放射線量を測定し、その後、鉛箱の内部に放射線量測定器を載置後、鉛箱の蓋に替えてカーボンナノホーンを塗布していない対照フィルターを鉛箱の開口部に密着固定し、3分後の放射線量を測定した。
さらに、鉛箱の外部近傍で3分間放射線量を測定し、その後、鉛箱の内部に放射線量測定器を載置後、鉛箱の蓋に替えてカーボンナノホーンを塗布した実施例フィルターを鉛箱の開口部に密着固定し、3分後の放射線量を測定した。
Claims (8)
- カーボンナノ材料の製造装置であって、
水性媒体を収容する水性媒体槽と、
少なくとも一部が前記水性媒体に浸漬される陰極と、
前記陰極の前記水性媒体に浸漬される部位に対向状に前記水性媒体中において間隔を隔てて配置される陽極と、
前記陰極と前記陽極とが対向して形成される隙間にアーク放電発生領域を形成可能に電圧を印加する機構と、
前記隙間の側方及び/又は前記陰極側から前記隙間に不活性ガスを導入することにより、前記水性媒体中の前記隙間に前記水性媒体によって直接遮断された不活性ガスキャビティを形成する機構と、
前記アーク放電発生領域に準備された炭素材料から合成された前記カーボンナノ材料を回収する機構と、
を備え、
前記不活性ガスキャビティ形成機構は、少なくとも前記隙間の側方から前記隙間に前記不活性ガスを導入して前記不活性ガスキャビティを形成し、
前記アーク放電発生機構は、前記不活性ガスキャビティに前記アーク放電発生領域を形成して前記カーボンナノ材料を合成する、製造装置。 - 前記不活性ガスキャビティ形成機構は、前記隙間に、前記水性媒体によって直接包囲された不活性ガスキャビティを形成する、請求項1に記載の装置。
- 前記陰極は、前記アーク放電発生領域を覆う隔壁を有していない、請求項1又は2に記載の装置。
- 前記陽極と前記陰極との隙間が1mm以上2mm以下である、請求項1〜3のいずれかに記載の製造装置。
- 前記カーボンナノ粒子を回収する機構は、
前記カーボンナノ粒子を含む前記水性媒体を吸引する機構と、
前記水性媒体から前記カーボンナノ粒子を分離する機構と、
分離した前記カーボンナノ粒子を乾燥する機構と、
を含む、請求項1〜4のいずれかに記載の製造装置。 - カーボンナノホーンの泡状体を製造する、請求項1〜5のいずれかに記載の製造装置。
- 前記水性媒体槽は、密閉可能である、請求項1〜6のいずれかに記載の製造装置。
- カーボンナノ材料の製造方法であって、
水性媒体中の陰極と陽極との隙間に、前記隙間の少なくとも側方から前記隙間に不活性ガスを導入して前記水性媒体中に前記水性媒体によって直接包囲された不活性ガスキャビティをその場形成し、その不活性ガスキャビティにおいて、アーク放電を発生させて当該前記不活性ガスキャビティに準備された炭素材料から炭素蒸気を発生させて前記カーボンナノ材料を合成する工程と、
前記カーボンナノ材料を回収する工程と、
を備える、製造方法。
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JP2011091502 | 2011-04-15 | ||
JP2011091502 | 2011-04-15 | ||
PCT/JP2012/060171 WO2012141307A1 (ja) | 2011-04-15 | 2012-04-13 | カーボンナノ材料製造装置及びその利用 |
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JP6850407B2 (ja) * | 2014-09-03 | 2021-03-31 | 株式会社ナノテクバンク | カーボンナノホーン及びその利用 |
JP7260141B2 (ja) * | 2016-03-16 | 2023-04-18 | 日本電気株式会社 | 繊維状カーボンナノホーン集合体を含んだ平面構造体 |
CN105860967B (zh) * | 2016-04-15 | 2017-12-01 | 安徽师范大学 | 荧光碳点及其制备方法以及催化对硝基苯酚降解的监测方法 |
CN109153563B (zh) * | 2016-04-20 | 2020-06-02 | Hrl实验室有限责任公司 | 用于制作纳米粒子和纳米粒子悬浮液的设备 |
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EP3509408B1 (en) * | 2016-09-05 | 2021-11-10 | Nec Corporation | Electromagnetic wave absorbent material |
KR102156924B1 (ko) * | 2016-10-17 | 2020-09-17 | 아진산업(주) | 나노복합재를 이용한 차량용 카메라 케이스 |
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EP2698348A4 (en) | 2015-04-22 |
CN109665510A (zh) | 2019-04-23 |
US9403685B2 (en) | 2016-08-02 |
US20140072504A1 (en) | 2014-03-13 |
WO2012141307A1 (ja) | 2012-10-18 |
EP2698348A1 (en) | 2014-02-19 |
CN103492315A (zh) | 2014-01-01 |
JPWO2012141307A1 (ja) | 2014-07-28 |
KR20140038411A (ko) | 2014-03-28 |
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