Removable Nonconjugated Polymers To Debundle and Disperse Carbon Nanotubes

2019 ◽  
Vol 52 (11) ◽  
pp. 4278-4286 ◽  
Author(s):  
Catherine Kanimozhi ◽  
Matthew J. Shea ◽  
Jaehyoung Ko ◽  
Wei Wei ◽  
Peishen Huang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Disperse Carbon

Wet Powder Metallurgy Process for Dispersing Carbon Nanotubes and Fabricating Magnesium Composite

2018 ◽  
Vol 759 ◽  
pp. 86-91 ◽  
Author(s):  
Jiang Tao Hou ◽  
Wen Bo Du ◽  
Zhao Hui Wang ◽  
Xian Du ◽  
Chao Xu
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Powder Metallurgy ◽  
Interfacial Interaction ◽  
Interface Bonding ◽  
Transmission Electron ◽  
Powder Metallurgy Process ◽  
Disperse Carbon ◽  
Effective Dispersion ◽  
Metallurgy Process

A wet powder metallurgy (WPM) process was developed to disperse carbon nanotubes (CNTs), and to fabricate the CNTs reinforced Mg matrix (CNTs/Mg) composite. The dispersion effect of CNTs were evaluated by field emission scanning electron microscopy (FE-SEM), dynamic light scattering (DLS) and high-resolution transmission electron microscopy (HR-TEM), respectively. Results showed that the CNTs were homogeneously dispersed on the surface of Mg powder. Adequate bonding and good interfacial interaction between the CNTs and Mg matrix contributed to the efficient load transferring from the CNTs to Mg matrix under a mechanical force. Furthermore, no brittle MgO was formed on the surface and it was beneficial to improving the adhesion of the CNTs to Mg matrix. With 0.5 wt.% CNTs addition, the CNTs/Mg composite experienced remarkable enhancements in tensile stress of 28% and Young’s modulus of 24%. The reasons responsible for these enhancements are suggested as the effective dispersion of the CNTs and the good interface bonding between the CNTs and Mg matrix.

Melt Mixing as Method to Disperse Carbon Nanotubes into Thermoplastic Polymers

2005 ◽  
Vol 13 (sup1) ◽  
pp. 211-224 ◽  
Author(s):  
Petra Pötschke ◽  
Arup R. Bhattacharyya ◽  
Andreas Janke ◽  
Sven Pegel ◽  
Albrecht Leonhardt ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermoplastic Polymers ◽  
Melt Mixing ◽  
Disperse Carbon

A Latex-Based Route to Disperse Carbon Nanotubes in Poly(2,6-Dimethyl-1,4-Phenylene Ether)/Polystyrene Blends

2013 ◽  
Vol 299 (2) ◽  
pp. 228-236 ◽  
Author(s):  
Nadia Grossiord ◽  
Bart A. J. Noordover ◽  
Hans E. Miltner ◽  
Theo Hoeks ◽  
Virginie Alexandre ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Disperse Carbon

A Simple Method to Disperse Carbon Nanotubes by Shearing Process

2011 ◽  
Vol 335-336 ◽  
pp. 255-259
Author(s):  
Xi Wang Wu ◽  
Jian Zhong Xiao ◽  
Feng Xia ◽  
Yong Gang Hu ◽  
Zhou Peng
Keyword(s):  
Carbon Nanotubes ◽  
Composite Powder ◽  
Dispersion Model ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Simple Method ◽  
Dispersion Mechanism ◽  
Disperse Carbon ◽  
The Ideal

The key problem to prepare carbon nanotubes (CNTs) reinforced ceramic matrix composites is how to break up massive agglomerates of CNTs and disperse uniformly CNTs. We obtain the CNTs-Al2O3composite powder by shear treatment on melted CNTs-Al2O3-agents mixture. Microstructure observations of CNTs-Al2O3composite powder show that CNTs can be dispersed uniformly by shearing process. The rheological results also affirm the conclusion. According to the rheological theory, we build the ideal dispersion model of CNTs-Al2O3suspension system and discuss the dispersion mechanism.

Preparation and Mechanical Properties of Carbon Nanotubes Reinforced Alumina Ceramic Composite

2011 ◽  
Vol 239-242 ◽  
pp. 2721-2727 ◽  
Author(s):  
Xi Wang Wu ◽  
Jian Zhong Xiao ◽  
Feng Xia ◽  
Yong Gang Hu ◽  
Zhou Peng
Keyword(s):  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Ceramic Composite ◽  
Hydrogen Atmosphere ◽  
Sem Analysis ◽  
Residual Tensile Stress ◽  
Alumina Matrix ◽  
Dispersion Method ◽  
Disperse Carbon ◽  
Key Issues

How to uniformly disperse carbon nanotubes (CNTs) and densely sinter green body are the key issues to prepare carbon nanotubes reinforced alumina (Al2O3) composite. We prepare CNTs-Al2O3 powder by shearing extruding dispersion method, and then obtain CNTs-Al2O3 composite by hydrogen atmosphere pressureless sintering. 93% of the relative increased fracture toughness can be achieved, when the CNTs content of composite is 1%. Because of Absorbing energy by pulling CNTs out from alumina matrix and refining grain by CNTs bundles sitting along alumina grain, the fracture toughness is improved obviously. By XRD and SEM analysis, the residual tensile stress which is caused by embedding CNTs into alumina matrix also plays an important role for the increase of fracture toughness.

Study on Dispersion of Carbon Nanotubes in Pb-Sn Electroplating Bath

2015 ◽  
Vol 778 ◽  
pp. 168-173
Author(s):  
Zheng Xi Hu ◽  
Xiao Hua Jie
Keyword(s):  
Carbon Nanotubes ◽  
Friction Coefficient ◽  
Milling Time ◽  
Composite Coatings ◽  
Volume Percent ◽  
Composite Plating ◽  
Friction Tester ◽  
Disperse Carbon ◽  
Plating Solution ◽  
Ball Milling Time

In order to get homogeneously dispersed carbon nanotubes suspension for composite plating, carbon nanotubes were ball milled for different times and polycyclic acid (PA) was used as dispersant in this work. Sedimentation ratio was calculated by measuring the absorbance of suspensions and friction coefficient of the composite coatings was measured by friction tester. Dispersant content and ball milling time on the dispersive stability of suspension were studied. The dispersion mechanisms were discussed. The results showed that PA could effectively disperse carbon nanotubes in Pb-Sn electroplating solution. When the volume percent of PA was 0.3%, milling time was 6h and the milling speed was 300r/min, the sedimentation ratio was the smallest. The composite coatings had the smallest friction coefficient. Besides, the mechanism of PA effectively dispersing CNTs in Pb-Sn electro plating solution was electrostatics stabilization.

scholarly journals Additive-free carbon nanotube dispersions, pastes, gels, and doughs in cresols

2018 ◽  
Vol 115 (22) ◽  
pp. 5703-5708 ◽  
Author(s):  
Kevin Chiou ◽  
Segi Byun ◽  
Jaemyung Kim ◽  
Jiaxing Huang
Keyword(s):  
Carbon Nanotubes ◽  
Form Factors ◽  
Weight Percent ◽  
Liquid Mixtures ◽  
Free Standing ◽  
Continuous Transition ◽  
Dispersing Agent ◽  
Disperse Carbon ◽  
Broad Array ◽  
High Concentrations

Cresols are a group of naturally occurring and massively produced methylphenols with broad use in the chemical industry. Here, we report that m-cresol and its liquid mixtures with other isomers are surprisingly good solvents for processing carbon nanotubes. They can disperse carbon nanotubes of various types at unprecedentedly high concentrations of tens of weight percent, without the need for any dispersing agent or additive. Cresols interact with carbon nanotubes by charge transfer through the phenolic hydroxyl proton and can be removed after processing by evaporation or washing, without altering the surface of carbon nanotubes. Cresol solvents render carbon nanotubes polymer-like rheological and viscoelastic properties and processability. As the concentration of nanotubes increases, a continuous transition of four states can be observed, including dilute dispersion, thick paste, free-standing gel, and eventually a kneadable, playdough-like material. As demonstrated with a few proofs of concept, cresols make powders of agglomerated carbon nanotubes immediately usable by a broad array of material-processing techniques to create desirable structures and form factors and make their polymer composites.

Dispersion of Multi Walled Carbon Nanotubes within 3 mol. % Yttria Stabilized Zirconia Based Ceramics: A Comparative Study of Methods

2013 ◽  
Vol 829 ◽  
pp. 659-664
Author(s):  
Roya Ermagan ◽  
Mahdiar Taheri ◽  
Ali Mohammad Zahedi ◽  
Farhad Golestanifard
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Sodium Dodecyl ◽  
Main Challenge ◽  
Disperse Carbon ◽  
Vis Spectroscopy ◽  
Water Media ◽  
Milling Method ◽  
Multi Walled Carbon Nanotubes ◽  
Surfactant Material

Achieving an appropriate dispersion of Carbon Nanotubes (CNTs) within a ceramic matrix should be referred to as the main challenge for the synthesis of CNTs reinforced ceramics with enhanced toughening properties. In the present paper, dispersion of 1 wt% MWCNTs within 3YTZP based ceramics has been investigated through the comparison of three conventional approaches based on using surfactants, functionalization, and planetary milling. Addition of 2 wt% Sodium Dodecyl Sulfate (SDS) as the surfactant material followed by 2 hours ultrasonication was found successful to disperse carbon nanotubes in a water media, while chemical functionalization of the CNTs surface using a mixture of H2SO4/HNO3 (3:1) could result in identical well dispersed powder mixtures. Formation of functional groups on the surface of CNTs was confirmed by FTIR spectroscopy and efficiency of the above methods to result in well dispersed powders was detected using UV-Vis spectroscopy. The surfactant method was, accordingly, found to result in the highest dispersion of nanotubes within the ceramic microstructure. In the planetary milling method, well dispersed CNTs within 3YTZP particles could be attained through the optimization of processing conditions such as 24 h milling time, 250 RPM, and 2 BPR. The accuracy of the above results could be verified by SEM as well as Raman spectroscopy. On the other hand, although the dispersed powders provided through functionalization and planetary milling methods revealed CNTs bundles in few scopes of the SEM results and minor damages were also observed in the Raman spectroscopy report, they were both at acceptable levels.

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