Inter-collisional cutting of multi-walled carbon nanotubes by high-speed agitation

Park, Ki Chul; Fujishige, Masatsugu; Takeuchi, Kenji; Arai, Shigeo; Morimoto, Shingo; Endo, Morinobu

doi:10.1016/j.jpcs.2008.05.006

Cited by 24 publications

(22 citation statements)

References 33 publications

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“…CNTs are filled together with steel balls into a rotating barrel for the milling process resulting in the grinding of the CNT material to the necessary fineness by friction and impact with the tumbling balls. Some authors discuss the effect of ball milling on the nanotubes morphology [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Measurement of the nanotubes lengths using transmission electron microscopy (TEM) shows that nanotubes break and their length decrease in dependence on the ball milling time [1,[4][5][6][7]. Using X-ray Photoelectron Spectroscopy (XPS) measurements, an increase of oxygen proportion at long operation time was found caused by collision-induced cutting under ambient atmosphere introducing oxygen-containing functional groups to the cut nanotubes [4,7].…”

Section: Introductionmentioning

confidence: 99%

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Influence of dry grinding in a ball mill on the length of multiwalled carbon nanotubes and their dispersion and percolation behaviour in melt mixed polycarbonate composites

Krause

Villmow

Boldt

et al. 2011

Composites Science and Technology

137

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractBall milling of carbon nanotubes (CNTs) in the dry state is a common way to produce tailored CNT materials for composite applications, especially to adjust nanotube lengths. For Nanocyl TM NC7000 nanotube material before and after milling for 5 and 10 hours the length distributions were quantified using TEM analysis, showing decreases of the mean length to 54 and 35%, respectively. With increasing ball milling time in addition a decrease of agglomerate size and an increase of packing density took place resulting in a worse dispersability in aqueous surfactant solutions. In melt mixed CNT polycarbonate composites produced using masterbatch dilution step the electrical properties, the nanotube length distribution after processing, and the nano-and macrodispersion of the nanotubes were studied. The slight increase in the electrical percolation threshold in the melt mixed composites with ball milling time of CNTs can be assigned to lower nanotubes lengths as well as the worse dispersability of the ball milled nanotubes. After melt compounding, the mean CNT lengths were shortened to 31%, 50%, and 66% of the initial lengths of NC7000, NC7000-5h, and NC7000-10h, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of dry grinding in a ball mill on the length of multiwalled carbon nanotubes and their dispersion and percolation behaviour in melt mixed polycarbonate composites

Krause

Villmow

Boldt

et al. 2011

Composites Science and Technology

137

View full text Add to dashboard Cite

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“…This might mean that MWCNT-L is completely dispersed as primary particles with HPC. 45 For the dispersibility of MWCNT-S, peaks corresponding to larger particle diameter are seen for all SDS concentrations (Fig. 2d).…”

Section: Methodsmentioning

confidence: 86%

Fabrication of Copper/Multiwalled Carbon Nanotube Composites Containing Different Sized Nanotubes by Electroless Deposition

Arai

Osaki

2014

J. Electrochem. Soc.

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Cu/multiwalled carbon nanotube (MWCNT) composites containing two different sized MWCNTs were fabricated using an electroless deposition technique in aqueous solution. In order to disperse the MWCNTs in the solution, an anionic dispersant of sodium dodecyl sulfate (SDS) and a polymeric dispersant of hydroxypropyl cellulose (HPC) were used. The dispersibility of the MWCNTs in solution was evaluated by measuring the particle size distribution. The zeta potential for the MWCNTs was also evaluated to examine the dispersibility. Uniform Cu/MWCNT composites containing the two different sized MWCNTs were fabricated through the electroless copper deposition process from a solution containing copper ions, a complexing agent, a reducing agent, and two dispersants, SDS and HPC, in addition to the two different sized MWCNTs.

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“…However, these profiles clearly present the degree of dispersion of the CNTs, and the large two peaks at around 100 nm and 10 μm correspond to the diameter and the length of a single CNT, respectively. 27 Thus, it is considered that the CNTs are homogeneously dispersed as primary particles in the composite plating baths with CNT concentrations of 2-10 g dm −3 . Figure 2 shows the zeta potentials of CNTs in the plating baths with various concentrations of CNTs.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Three-Dimensional (3D) Copper/Carbon Nanotube Composite Film by One-Step Electrodeposition

Arai

Ozawa

Shimizu

2016

J. Electrochem. Soc.

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A three-dimensional (3D) composite film containing copper nanostructures and carbon nanotubes (3DC/CNT composite film) was fabricated by one-step electrodeposition. The 3DC/CNT composite film was formed under galvanostatic conditions using a copper sulfate bath containing CNTs and polyacrylic acid which acts as both a 3DC-forming and a CNT-dispersing agent. The composite film consists of thin copper sheets with thicknesses of ca. 70-80 nm and CNTs, with large interior spaces between sheets. The CNTs were homogeneously distributed inside the composite film and were fixed by the copper sheets where CNTs pierce the copper sheets. The CNT content in the composite films increased with the CNT concentration of the plating bath. The 3DC film without CNTs did not maintain its 3D spaces when the film thickness was increased due to insufficient structural strength, whereas the 3DC/CNT composite film maintained the 3D spaces despite an increase in film thickness, which suggests that the CNTs reinforce the film to maintain the 3D spaces. Three-dimensional (3D) nanostructured metal architectures typically exhibit large specific surface areas and high electrical conductivity; therefore, their application as electrodes in functional devices such as supercapacitors, 1 fuel cells 2 and batteries 3 have been widely researched. For these potential applications, the use of 3D copper nanostructured architectures 4-8 is most attractive. However, although 3D copper nanostructured architectures are very effective to improve electrode functions, their manufacture requires many steps and is therefore complex. Our group has previously developed a very straightforward method for the fabrication of 3D copper nanostructured architectures by electrodeposition, in which an organic additive is simply added to an electrodeposition bath.9 This process for the preparation of 3D copper nanostructured architecture films by onestep electrodeposition (the resulting products henceforth being designated as 3DC1 film) is expected to be used as a practical method for the fabrication of various components, such as current collectors for tin-based lithium-ion battery anodes.10 However, the 3DC1 film consists of very thin (30-50 nm) copper sheets; therefore, its structural strength is low, which results in deformation of the 3D structure when a slight physical force is applied.In contrast, carbon nanotubes (CNTs) 11,12 have excellent mechanical characteristics, 13-15 such as high tensile strength and high elastic modulus, in addition to high thermal [16][17][18] and electrical conductivity. 19,20 Research into CNT composites such as metal/CNT composites has thus been actively pursued.21,22 A 3D-copper nanostructured architecture containing CNTs (3DC/CNT composite) is thus considered to be an attractive copper-based 3D composite material that would have sufficient structural strength due to the reinforcement effect of the CNTs. If a 3DC/CNT composite could be fabricated by a simple method, then the 3DC/CNT composite materials would be expected to be used for ...

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Inter-collisional cutting of multi-walled carbon nanotubes by high-speed agitation

Cited by 24 publications

References 33 publications

Influence of dry grinding in a ball mill on the length of multiwalled carbon nanotubes and their dispersion and percolation behaviour in melt mixed polycarbonate composites

Influence of dry grinding in a ball mill on the length of multiwalled carbon nanotubes and their dispersion and percolation behaviour in melt mixed polycarbonate composites

Fabrication of Copper/Multiwalled Carbon Nanotube Composites Containing Different Sized Nanotubes by Electroless Deposition

Fabrication of Three-Dimensional (3D) Copper/Carbon Nanotube Composite Film by One-Step Electrodeposition

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