A Novel Method for Preparing Preforms of Porous Alumina and Carbon Nanotubes by CVD

2002 ◽  
Vol 4 (9) ◽  
pp. 701-703 ◽  
Author(s):  
J.B. Bai ◽  
J.-L. Vignes ◽  
T. Fournier ◽  
D. Michel
Keyword(s):  
Carbon Nanotubes ◽  
Porous Alumina ◽  
Novel Method

A NOVEL METHOD TO SYNTHESIZE N-DOPED CNTs ARRAYS VIA CHEMICAL MODIFYING POROUS ALUMINA MEMBRANE

2014 ◽  
Vol 21 (02) ◽  
pp. 1450021 ◽  
Author(s):  
CHENGYONG LI ◽  
LEI HE
Keyword(s):  
Carbon Nanotubes ◽  
Porous Alumina ◽  
Atomic Ratio ◽  
Raw Material ◽  
Alumina Membrane ◽  
One Step ◽  
Novel Method ◽  
Porous Alumina Membrane

N -doped carbon nanotubes (CNTs) arrays were fabricated via simply chemical modifying porous alumina membrane (PAM) with dopamine. The diameter of N -doped CNTs is about 60–70 nm. The N / C atomic ratio is calculated to be 0.05 and the main functionality is pyridone/pyrrole N . This chemical modifying method can be used to fabricate mass of N -doped CNTs arrays in one step with single raw material.

scholarly journals Study on the nonlinear vibration of embedded carbon nanotube via the Hamiltonian-based method

2021 ◽  
pp. 146134842110327
Author(s):  
Kang-Jia Wang ◽  
Guo-Dong Wang
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Nonlinear Vibration ◽  
Elastic Medium ◽  
Numerical Results ◽  
Frequency Property ◽  
New Novel ◽  
Novel Method

This article mainly studies the vibration of the carbon nanotubes embedded in elastic medium. A new novel method called the Hamiltonian-based method is applied to determine the frequency property of the nonlinear vibration. Finally, the effectiveness and reliability of the proposed method is verified through the numerical results. The obtained results in this work are expected to be helpful for the study of the nonlinear vibration.

Synthesis of aligned carbon nanotubes in organic liquids

2002 ◽  
Vol 17 (9) ◽  
pp. 2457-2464 ◽  
Author(s):  
Yafei Zhang ◽  
Mikka N.-Gamo ◽  
Kiyoharu Nakagawa ◽  
Toshihiro Ando
Keyword(s):  
Carbon Nanotubes ◽  
Organic Liquid ◽  
Film Surface ◽  
Normal Pressure ◽  
Organic Liquids ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
Aligned Carbon Nanotubes ◽  
Novel Method ◽  
The Right

A simple and novel method was developed for efficient synthesis of aligned multiwalled carbon nanotubes (CNTs) in methanol and ethanol under normal pressure. The CNTs' alignment and structures were investigated using Raman scattering and x-ray diffraction spectroscopy. A unique kind of coupled CNT was synthesized in which one rotated to the left and one rotated to the right. Chains periodically bridged the coupled CNTs. The growth mechanism of the CNTs within organic liquid is proposed to be a catalytic process at the Fe film surface in a dynamic and thermal nonequilibrium condition in organic liquids.

Influence Analysis of Sampling Time for Synthesis of Carbon Nanotubes in the V-Type Pyrolysis Flame

2011 ◽  
Vol 221 ◽  
pp. 235-239 ◽  
Author(s):  
Yuan Chao Liu ◽  
Bao Min Sun ◽  
Zhao Yong Ding
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Experimental System ◽  
Growth Period ◽  
Sampling Time ◽  
High Yield ◽  
Spray Pyrolysis Method ◽  
Transmission Electron ◽  
Novel Method ◽  
Synthesis Of Carbon Nanotubes

Synthesis of carbon nanotubes from V-type pyrolysis flame is a kind of novel method. It needs simple laboratory equipments and normal atmosphere pressure. The V-type pyrolysis flame experimental system is introduced. Carbon source is the carbon monoxide and heat source is from acetylene/air premixed flame. Pentacarbonyl iron, served as catalyst, is transported by spray- pyrolysis method into the flame. The carbon nanotubes were characterized by scanning electron microscope and transmission electron microscope. This study aims to find the formation rule of carbon nanotubes from the V-type pyrolysis flame in different sampling times. The carbon nanotubes with less impurity and high yield were captured successfully in the V-type pyrolysis flame. The diameter of carbon nanotubes was approximate between 10nm and 20nm, and its length was dozens of microns. When the sampling time was below 3 minutes, the growth of carbon nanotubes came into the preparation growth period. The length of the carbon nanotubes increased gradually and the diameter had no obvious change with the extension of sampling time. When the sampling time was continued to the 5th minute, the growth of carbon nanotubes came into the exuberant growth period. The carbon nanotubes growth was finished within 5minutes. Longer sampling time was meaningless after the carbon nanotubes formation.

scholarly journals Removal of Cr(VI) by magnetic Fe/C crosslinked nanoparticle for water purification: rapid contaminant removal property and mechanism of action

2018 ◽  
Vol 78 (10) ◽  
pp. 2171-2182 ◽  
Author(s):  
Runhua Chen ◽  
Ping Wang ◽  
Meng Li ◽  
Fei Tian ◽  
Jiangjun Xiao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Covalent Bond ◽  
Contaminant Removal ◽  
X Ray Diffraction ◽  
Working Mechanism ◽  
Efficient Treatment ◽  
Effective Removal ◽  
Bond Property ◽  
Novel Method ◽  
Optimized Conditions

Abstract In this study, a novel method based on the magnetic Fe/C crosslinked nanoparticles (MNZVI/CNTs-OH) is reported for the effective removal of Cr(VI) in aqueous solutions. Parameters that influence the effectiveness of the nanoparticles, such as pH, temperature, reaction time, and particle dosage, was analyzed. It was found that MNZVI/CNTs-OH particles exhibit significantly higher activity toward Cr(VI) removal than bare NZVI, carbon nanotubes (CNTs), and other synthetic nanomaterials. Under optimized conditions, the removal efficiency of Cr(VI) by MNZVI/CNTs-OH is up to 98% with an initial contaminant concentration of 50 mg/L, and chromium content in the residue up to 48 mg/g. Physical characterizations, including Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and TG-TD measurements, provide insights into the working mechanism of Cr(VI) purification. Our findings suggest that immobilization of MNZVI onto carbon nanotubes increase the covalent bond property, while crosslinked nanoparticles (NPs) provide the electron transfer passage from the NZVI surface and improves the dispersity of the MNZVI, thus enhancing the performance. These results demonstrate the potential of the MNZVI/CNTs-OH nanoparticles for the rapid and efficient treatment of Cr(VI)-containing wastewater.

Fabrication of conductive porous alumina (CPA) structurally modified with carbon nanotubes (CNT)

2013 ◽  
Vol 24 (5) ◽  
pp. 824-828 ◽  
Author(s):  
Chunxi Hai ◽  
Takashi Shirai ◽  
Masayoshi Fuji
Keyword(s):  
Carbon Nanotubes ◽  
Porous Alumina

Novel Method of Converting Metallic-Type Carbon Nanotubes to Semiconducting-Type Carbon Nanotube Field-Effect Transistors

2006 ◽  
Vol 45 (4B) ◽  
pp. 3680-3685 ◽  
Author(s):  
Bae-Horng Chen ◽  
Jeng-Hua Wei ◽  
Po-Yuan Lo ◽  
Zing-Way Pei ◽  
Tien-Sheng Chao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Novel Method

Novel method and its mechanism of reconstruction of commercial alumina to homogeneous porous alumina composite material

2019 ◽  
Vol 45 (16) ◽  
pp. 19962-19970 ◽  
Author(s):  
Shuaibo Gao ◽  
Shuai Wang ◽  
Jian Kong ◽  
Ning Xu ◽  
Pengfei Xing
Keyword(s):  
Composite Material ◽  
Porous Alumina ◽  
Commercial Alumina ◽  
Alumina Composite ◽  
Novel Method

Large-Scale Assembly of Carbon Nanotubes

2004 ◽  
Author(s):  
T. El-Aguizy ◽  
Sang-Gook Kim
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Large Scale ◽  
Small Scale ◽  
Manufacturing Processes ◽  
Micro Scale ◽  
Multi Scale ◽  
Novel Method ◽  
Functionalization Of Carbon Nanotubes

The scale decomposition of a multi-scale system into small-scale order domains will reduce the complexity of the system and will subsequently ensure a success in nanomanufacturing. A novel method of assembling individual carbon nanotube has been developed based on the concept of scale decomposition. Current technologies for organized growth of carbon nanotubes are limited to very small-scale order. The nanopelleting concept is to overcome this limitation by embedding carbon nanotubes into micro-scale pellets that enable large-scale assembly as required. Manufacturing processes have been developed to produce nanopellets, which are then transplanted to locations where the functionalization of carbon nanotubes are required.

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