The quantitative removal of metal catalyst from multi-walled carbon nanotubes with minimal tube damage

2008 ◽  
Vol 86 (12) ◽  
pp. 1138-1143 ◽  
Author(s):  
Trisha A Huber ◽  
Michael C Kopac ◽  
Catherine Chow
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Inductively Coupled Plasma ◽  
Metal Catalyst ◽  
Acid Oxidation ◽  
Purification Method ◽  
Inductively Coupled ◽  
Multi Walled Carbon Nanotubes ◽  
Almost All ◽  
Walled Carbon Nanotubes

A purification method for multi-walled carbon nanotubes (MWCNTs) has been developed to remove almost all (>98%) residual metal catalyst without introducing a significant amount of surface functionality. The process involves alternating mild acid oxidation and thermal oxidation in an iterative fashion with progressively higher temperatures for thermal treatment, in accordance with the increasing thermal stability. Thermogravimetric analysis and inductively coupled plasma mass spectrometry were employed to assess thermal stability and residual catalyst content, respectively, throughout the process. Transmission electron microscopy confirms the integrity of the nanotubes, and the degree of acid functionalization introduced by the acid oxidation is minimal, as determined by titration analysis.Key words: multi-walled carbon nanotube, purification, ICP-MS, TGA, FTIR.

Purification of Multi-Walled Carbon Nanotubes Grown by Thermal CVD on Fe-Based Catalyst

2006 ◽  
Vol 48 ◽  
pp. 50-54 ◽  
Author(s):  
Th. Dikonimos Makris ◽  
L. Giorgi ◽  
R. Giorgi ◽  
Nicola Lisi ◽  
Elena Salernitano ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Catalyst Support ◽  
Secondary Phase ◽  
Metal Catalyst ◽  
Purification Method ◽  
Thermal Cvd ◽  
Aluminum Ions ◽  
Before And After ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Aiming at the purpose of using carbon nanotubes as secondary phase in composite materials, removal of metal catalyst, catalyst support and amorphous carbon is crucial to make the most of the required properties. A purification method was developed to remove the metal catalyst from multi-walled nanotubes grown by thermal CVD. A nanosized Fe-based catalyst, prepared by coprecipitation of iron and aluminum ions, followed by solid state reaction, was used to catalyze the growth. Carbon nanotubes were subjected to acid purification and a comparison between nitric acid and a mixture of nitric and hydrochloric acid for the removal of Fe and Fe oxides is provided. Morphological and spectroscopic analyses of the materials were performed, both before and after the purification processes.

The Hybridization of Multi-Walled Carbon Nanotubes with Various Drugs

2015 ◽  
Vol 638 ◽  
pp. 85-90
Author(s):  
Adriana Duma Voiculet ◽  
Mariana Prodana ◽  
Ioana Demetrescu
Keyword(s):  
Carbon Nanotubes ◽  
Inductively Coupled Plasma ◽  
Body Fluid ◽  
Multiwalled Carbon ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Icp Ms ◽  
Multi Walled Carbon Nanotubes ◽  
Functionalized Multiwalled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Functionalized multiwalled carbon nanotubes (MWCNTs) by various groups (carboxyl or amino) can improve the properties of anti-tumoral drugs (cisplatin, docetaxel, zometa). Functionalization was evidenced by infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Platinum ions released in simulated body fluid (SBF) were measured by inductively coupled plasma ion spectrometry (ICP-MS).

Calibration of reaction parameters for the improvement of thermal stability and crystalline quality of multi-walled carbon nanotubes

2010 ◽  
Vol 45 (3) ◽  
pp. 783-792 ◽  
Author(s):  
Saveria Santangelo ◽  
Giacomo Messina ◽  
Giuliana Faggio ◽  
Maurizio Lanza ◽  
Alessandro Pistone ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Crystalline Quality ◽  
Reaction Parameters ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Polymeric Composites Based on Polyurea Matrix Reinforced with Carbon Nanotubes

2017 ◽  
Vol 54 (1) ◽  
pp. 41-44 ◽  
Author(s):  
Maria Adina Vulcan ◽  
Celina Damian ◽  
Paul Octavian Stanescu ◽  
Eugeniu Vasile ◽  
Razvan Petre ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Scanning Electron Microscopy ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Scanning Electron

This paper deals with the synthesis of polyurea and its use as polymer matrix for nanocomposites reinforced with multi-walled carbon nanotubes (MWCNT). Two types of materials were obtained during this research, the first cathegory uses the polyurea as matrix and the second one uses a mixture between epoxy resin and polyurea. The nanocomposites were characterized by Thermogravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), Scanning Electron Microscopy (SEM) and Tensile Tests .The elastomeric features of nanocomposites were highlighted by the results which showed low value of Tg. Also higher thermal stability with ~40oC compared with commercial products (M20) were observed, but lower mechanical properties compared to neat polyurea.

Enhanced thermal stability of multi-walled carbon nanotubes after coating with polyaniline salt

2012 ◽  
Vol 97 (8) ◽  
pp. 1405-1414 ◽  
Author(s):  
Zuzana Morávková ◽  
Miroslava Trchová ◽  
Elena Tomšík ◽  
Juraj Čechvala ◽  
Jaroslav Stejskal
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Thermal Stability Of
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