少妇自慰一区二区三区,久久免三级,久久午夜伦理电影,日韩欧美多人

產(chǎn)品展示
當前位置:首頁 > 全部產(chǎn)品 > 英國Ossila > 材料 > 代理Ossila 雙壁碳納米管 Ossila碳納米管M2016L1

代理Ossila 雙壁碳納米管 Ossila碳納米管M2016L1

代理Ossila 雙壁碳納米管 Ossila碳納米管M2016L1
廠家直接訂貨、聯(lián)邦快遞直達、交期迅速。有需求的老師及同學可放心購買!??!

分享到:

只用于動物實驗研究等

Product List

All our DWCNT come packed as dry powders, which can be dispersed within the user's solvent of choice.

Double-Walled Carbon Nanotube Powders

Product codeM2016L1
Outer Diameter2-4 nm
Internal Diameter1-3 nm
Length~50 μm
Specific Surface Area350 m2.g-1
Purity> 60%
MSDS 
Sale Quantities250 mg, 500 mg, 1 g
Packaging InformationLight-resistant bottle

*For larger orders, please us to discuss prices.

Functionalised Double-Walled Carbon Nanotube Powders

Product codeM2017L1M2018L1
Outer Diameter2-4 nm2-4 nm
Internal Diameter1-3 nm1-3 nm
Length~ 50 μm~ 50 μm
Specific Surface Area350 m2.g-1350 m2.g-1
Functional Group-COOH-OH
Functional Group Wt.%~ 2.6%~ 3%
Purity> 60%> 60%
MSDS  
Sale Quantities250 mg, 500 mg, 1g
Packaging InformationLight-resistant bottle

*For larger orders, please us to discuss prices.

What are Double-Walled Carbon Nanotubes?

DWCNTs consist of two individual carbon nanotubes, with one embedded inside the other. The differences in diameters and the chirality of the two different nanotubes lead to a varying degree of interaction between the two, while at the same time the properties of the individual nanotubes being separate from each other. It is this wide variety of possibilities that have made DWCNTs a focus of interest for carbon nanotube research. Varying chirality allows a range of inner-wall outer-wall interactions to occur, because the chirality determines whether the nanotube will be semiconducting or metallic. It is possible to achieve metallic-metallic, semiconducting-metallic, metallic-semiconducting or semiconducting-semiconducting interactions. In addition to this, the metallic and semiconducting properties can vary depending upon the exact lattice parameters, which enables a wide range of possible property combinations.代理Ossila 雙壁碳納米管 Ossila碳納米管M2016L1
 

DWCNTs also have a large advantage over single-walled carbon nanotubes, as it is possible to modify the outer nanotube without changing the properties of the inner nanotube. This modification could be either through functionalisation (to add solubilising groups), or the doping of the structure (to alter the properties). This allows the double-walled system to maintain functionality of a single-walled nanotube whilst simultaneously having the solubility of functionalised nanotubes. This combination makes double-walled systems attractive for use as additives in composite materials as it allows high doping concentrations without affecting the properties of the nanotube overall.代理Ossila 雙壁碳納米管 Ossila碳納米管M2016L1
 

The biggest barriers for DWCNTs - with regards to further research and commercialisation - are their synthesis and purification. The yields produced by various synthesis techniques can vary from around 50% to 90% for arc discharge. Similarly, for catalytic chemical vapour deposition the yields can vary from 70% to 85%. The remainder of the nanotubes synthesised using these techniques are a mixture of single-walled and multi-walled nanotubes which then need to be purified to obtain individual double-walled nanotubes. The process of purification is much more difficult. Methods such as high-temperature oxidation result in preferential oxidation of single-walled nanotubes over double-walled. However, the process can damage the remaining nanotubes and will leave residual multi-walled contaminants behind. Other processes, such as ultra-centrifugation, can be used to obtain high-purity DWCNT samples and sort double-walled samples by outer diameter. However this process is labour and time intensive making commercialisation and large scale production of high purity DWCNTs difficult.
 

Just like with single-walled carbon nanotubes, there are many different areas in which DWCNT's can be applied due to their impressive mechanical and electrical properties. In addition double-walled nanotubes show an increase in the mechanical strength, thermal stability, and also chemical stability over that of single-walled nanotubes. However, the ability to combine different nanotube types have the potential to result in interesting optical, electronic and mechanical properties that are not possible with single-walled nanotubes, and could result in the most interesting research in the coming years.

Dispersion Guides

Similarly to single-walled carbon nanotubes, DWCNTs are insoluble. But by using a combination of surfactants and ultrasonic vibration, it is possible to disperse and suspend small concentrations of nanotubes. For dispersing in aqueous solutions, we recommend the use of sodium dodecylbenzene sulfonate if an ionic surfactant is suitable. If a non-ionic surfactant is needed, we recommend surfactants with high molecular weights.

  • Weigh out the desired amount of carbon nanotubes.
  • Mix together your solvent and surfactant of choice at the desired surfactant concentration. This should be below the critical micelle concentration of the surfactant.
  • Add the solvent-surfactant mix to the dry powder and shake vigorously to mix.
  • Either place an ultrasonic probe into the solution or place the solution into an ultrasonic bath. Be careful about the length of time and power used - as damage to the carbon nanotubes can occur, shortening their average length.
    • The resulting solution will be a mixture of suspended single walled nanotubes and bundles of single walled nanotubes; further sonication will help break up the bundles.
  • To separate out the individual nanotubes in solution from the bundles, the solution should be placed into a centrifuge. If the solution is centrifuged for a longer time and/or at a higher speed, the smaller bundles will be removed narrowing the distribution of suspended nanotubes.

Functionalized DWCNT's can be dispersed without the use of surfactants, a maximum of 0.1mg/ml can be achieved for COOH and OH.

Technical Data

General Information

CAS number7440-44-0
Chemical formulaCxHy
Recommended DispersantsDI Water, DMF, THF, Ethanol, Acetone
SynonymsDouble-Walled Carbon Nanotubes, Double Wall Carbon Nanotube, Carbon Nanotube, DWNT, DWCNT, CNT
Classification / Family1d materials, Carbon nanomaterials, Nanomaterials, Polycyclic aromatic hydrocarbons, Thin-film electronics.
Colour / AppearanceBlack, fibrous powder

1D Related Products

Single-Wall Carbon Nanotubes

Single-Wall Carbon Nanotubes

Double-Walled Carbon Nanotubes

Double-Walled Carbon Nanotubes

Multi-Walled Carbon Nanotubes

Double-Walled Carbon Nanotube Publications

  • Double-Walled Carbon Nanotubes: Challenges and Opportunities, C. Shen et. al. Nanoscale, 3, 503-518, (2010) DOI: 10.1039/C0NR00620C
  • Properties and Applications of Double-Walled Carbon Nanotubes Sorteb by Outer-Wall Electronic Type. A. A. Green et. al., ACS Nano, 5, 2011, 1459-1467, (2011) DOI: 10.1021/nn103263b
  • Linking Chiral Indicies and Transport Properties of Double-Walled Carbon Nanotubes, M. Kociak et. al., Phys. Rev. Lett., 89, 155501, (2002), DOI: 10.1103/PhysRevLett.89.155501
  • Double-Walled Carbon Nanotube Solar Cells. J. Wei et. al., Nano Lett., 7, 2317-2321, (2007) DOI: 10.1021/nl070961c
  • Raman Spectroscopy Study of Isolated Double-Walled Carbon Nanotubes with Different Metallic and Semiconducting Configurations, F. Villalpando-Paez et. al., Nano Lett., 8, 3879-3886, (2008), DOI: 10.1021/nl802306t

留言框

  • 產(chǎn)品:

  • 您的單位:

  • 您的姓名:

  • 聯(lián)系電話:

  • 常用郵箱:

  • 省份:

  • 詳細地址:

  • 補充說明:

  • 驗證碼:

    請輸入計算結果(填寫阿拉伯數(shù)字),如:三加四=7

深圳市澤拓生物科技有限公司是國內(nèi)專業(yè)的代理Ossila 雙壁碳納米管 Ossila碳納米管M2016L1廠家,歡迎廣大顧客來電咨詢!
深圳市澤拓生物科技有限公司版權所有   |   技術支持:化工儀器網(wǎng)
聯(lián)系電話:0755-23003036   傳真:0755-23003036-807 GoogleSitemap 備案號:粵ICP備17105262號  管理登陸
在線客服
用心服務成就你我
香蕉视屏亚洲| 欧美日韩高清中文字幕一区| 逼白浆视频| 欧美在线黄片直播观看视频| 后入内射少妇 日韩| 欧美日韩亚洲一区在线| AV日韩精品网站| 给我搜欧美一级黄片| 亚洲AV成人综合网| 天天日天天摸天天搞天天干| 性爱偷拍久久| 欧美+成人+精品| 国产免费熟女| 三级视频麻豆出品| 日本999久久久| 日韩精品一区在线视频| 黄色在线网站三区| 国产午夜精品无码| AVyiquerqusanqu| 欧洲成在人线免费视频| 在线视频你懂得二区| 97欧美视频在线观看| 国产精品欧美精品日韩| 国产老人性精品久久| 国产午夜精品欧美日韩麻豆| 國产97在线一日韩| 手机在线免费观看不卡av| 日本中文字幕日韩精品| 色综合蜜桃五月婷婷| 日韩欧美性爽视频国产免费| 欧美日韩国产乱码一二三区| 欧美成人日韩在线网站| 中文字幕一区二区三区干哥| 色色色色色91伊人| 天堂AV呦呦| 日韩一区二区人妻| 少妇熟女人妻体内| 亚洲一级片人妻| 不卡无码六月丁香| www.国产porn.copm| 欧美 日韩 亚洲综合|