Effect of Ni catalyst dispersion on the growth of carbon nanofibers onto carbon fibers

2011 ◽  
Vol 142 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Long-Yue Meng ◽  
Cheol-Whan Moon ◽  
Seung-Soon Im ◽  
Kyu-Hwan Lee ◽  
Joon-Hyung Byun ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Ni Catalyst ◽  
Catalyst Dispersion

Cytocompatibility of Carbon Nanofiber Materials for Neural Applications

2003 ◽  
Vol 774 ◽  
Author(s):  
Janice L. McKenzie ◽  
Michael C. Waid ◽  
Riyi Shi ◽  
Thomas J. Webster
Keyword(s):  
Carbon Fiber ◽  
Surface Energy ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Carbon Nanofiber ◽  
Fiber Composite ◽  
Scar Tissue ◽  
Pc 12 Cells ◽  
Low Surface Energy ◽  
Poly Carbonate

AbstractSince the cytocompatibility of carbon nanofibers with respect to neural applications remains largely uninvestigated, the objective of the present in vitro study was to determine cytocompatibility properties of formulations containing carbon nanofibers. Carbon fiber substrates were prepared from four different types of carbon fibers, two with nanoscale diameters (nanophase, or less than or equal to 100 nm) and two with conventional diameters (or greater than 200 nm). Within these two categories, both a high and a low surface energy fiber were investigated and tested. Astrocytes (glial scar tissue-forming cells) and pheochromocytoma cells (PC-12; neuronal-like cells) were seeded separately onto the substrates. Results provided the first evidence that astrocytes preferentially adhered on the carbon fiber that had the largest diameter and the lowest surface energy. PC-12 cells exhibited the most neurites on the carbon fiber with nanodimensions and low surface energy. These results may indicate that PC-12 cells prefer nanoscale carbon fibers while astrocytes prefer conventional scale fibers. A composite was formed from poly-carbonate urethane and the 60 nm carbon fiber. Composite substrates were thus formed using different weight percentages of this fiber in the polymer matrix. Increased astrocyte adherence and PC-12 neurite density corresponded to decreasing amounts of the carbon nanofibers in the poly-carbonate urethane matrices. Controlling carbon fiber diameter may be an approach for increasing implant contact with neurons and decreasing scar tissue formation.

Properties of Carbon Nanofibers Prepared from Polyacrylonitrile/Poly(methyl Methacrylate) Blend

2009 ◽  
Vol 79-82 ◽  
pp. 353-356
Author(s):  
Wei Pan ◽  
Yan Chen ◽  
Xiao Wei He
Keyword(s):  
Methyl Methacrylate ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Nitrogen Atmosphere ◽  
Wet Spinning ◽  
X Ray Diffraction ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
Graphite Crystallite ◽  
Raman Microspectrometry

The polyacrylonitrile(PAN)/poly (methyl methacrylate)(PMMA) blend fibers were prepared by wet-spinning technique and carbonized over the temperature range of 400-1000°C in nitrogen atmosphere. After carbonization of the blend fibers, the PMMA component removed and the PAN component left in the form of carbon nanofibers. Morphology of the carbon nanofibers were investigated via scanning electron microscopy (SEM), and the carbonization behavior of the fibers were examined via x-ray diffraction (XRD), Raman microspectrometry. The optimal condition made carbon fibers with great L/D ratio and diameter less than 200 nm. XRD and Raman spectra shows that the PAN/PMMA blend fibers treated at 600°C produced some graphite crystallite.

Direct conversion of carbon nanofibers and nanotubes into diamond nanofibers and the subsequent growth of large-sized diamonds

Nanoscale ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 2238-2248 ◽  
Author(s):  
J. Narayan ◽  
A. Bhaumik ◽  
R. Sachan ◽  
A. Haque ◽  
S. Gupta ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Laser Annealing ◽  
Pulsed Laser ◽  
Direct Conversion ◽  
Ambient Conditions ◽  
Subsequent Growth ◽  
Pulsed Laser Annealing ◽  
Annealing Method

We report a pulsed laser annealing method to convert carbon fibers and nanotubes into diamond fibers under ambient conditions.

scholarly journals Effects of electrophoretically deposited carbon nanofibers on the interface of single carbon fibers embedded in epoxy matrix

Carbon ◽  
2011 ◽  
Vol 49 (8) ◽  
pp. 2750-2759 ◽  
Author(s):  
Joseph D. Schaefer ◽  
Alejandro J. Rodriguez ◽  
Mauricio E. Guzman ◽  
Chee-Sern Lim ◽  
Bob Minaie
Keyword(s):  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Epoxy Matrix

FORMATION OF CARBON NANOTUBES ON CARBON PAPER AND STAINLESS STEEL SCREEN BY OHMICALLY HEATING CATALYTIC SITES

2002 ◽  
Vol 01 (03n04) ◽  
pp. 223-234 ◽  
Author(s):  
X. SUN ◽  
R. LI ◽  
G. LEBRUN ◽  
B. STANSFIELD ◽  
J. P. DODELET ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Gas Phase ◽  
Carbon Fibers ◽  
Multiwall Carbon Nanotubes ◽  
Ni Catalyst ◽  
Carbon Paper ◽  
Catalytic Sites ◽  
Negative Effect ◽  
Multiwall Carbon

A newly designed gas phase thermal decomposition reactor, ohmically heating the catalytic sites, has been used to synthesize multiwall carbon nanotubes (MWCNTs) on carbon paper and stainless steel screen. Co-Ni catalyst particles were dispersed by a silane intermediate layer adsorbed onto the carbon fibers or the stainless steel threads of the supports. MWCNTs were obtained on both substrates by a tip grown mechanism. They are about 20 μm in length and 15–50 nm in diameter. A methanol pretreatment of the carbon fibers significantly increased the density of the tubes on the carbon paper, but the same treatment had a negative effect on stainless steel. The MWCNTs, which adhere firmly to the carbon paper and the stainless steel screen, may find applications as electrodes in fuel cells, sensors and in photonics.

Hierarchical porous Fe/N doped carbon nanofibers as host materials for high sulfur loading Li–S batteries

Nanoscale ◽  
2019 ◽  
Vol 11 (32) ◽  
pp. 15156-15165 ◽  
Author(s):  
Mao Jiang ◽  
Ruxing Wang ◽  
Kangli Wang ◽  
Shu Gao ◽  
Jing Han ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
High Performance ◽  
Porous Structures ◽  
Host Materials ◽  
Hierarchical Porous ◽  
High Sulfur Loading

Self-supporting carbon fibers with unique hierarchical porous structures and abundant Fe/N adsorption–nucleation centers enable the construction of high performance Li–S batteries.

Urea-assisted template-less synthesis of heavily nitrogen-doped hollow carbon fibers for the anode material of lithium-ion batteries

2019 ◽  
Vol 43 (9) ◽  
pp. 3821-3828 ◽  
Author(s):  
Joonyoung Jang ◽  
Hee-eun Kim ◽  
Suhee Kang ◽  
Jin Ho Bang ◽  
Caroline Sunyong Lee
Keyword(s):  
Lithium Ion Batteries ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Lithium Ion ◽  
Gas Evolution ◽  
One Dimensional ◽  
Nitrogen Doped ◽  
Unique Decomposition ◽  
Decomposition Pathway ◽  
Hollow Carbon

A unique decomposition pathway of urea involving gas evolution was exploited as a way to introduce voids and mesopores into one-dimensional carbon nanofibers.

Carbon Nanofiber Surface Roughness Increases Osteoblast Adhesion

2003 ◽  
Vol 774 ◽  
Author(s):  
Karen S. Ellison ◽  
Rachel L. Price ◽  
Karen M. Haberstroh ◽  
Thomas J. Webster
Keyword(s):  
Surface Roughness ◽  
Carbon Fiber ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Carbon Nanofiber ◽  
Callus Formation ◽  
Study Results ◽  
Osteoblast Adhesion ◽  
High Degree

AbstractThe present study demonstrated for the first time desirable cytocompatibility properties of carbon nanofibers pertinent for bone prosthetic applications. Specifically, osteoblast (boneforming cells), fibroblast (cells contributing to callus formation and fibrous encapsulation events that result in implant loosening), chondrocyte (cartilage-forming cells), and smooth muscle cell (for comparison purposes) adhesion were determined on carbon nanofibers in the present in vitro study. Results provided evidence that nanometer dimension carbon fibers promoted select osteoblast adhesion, in contrast to the performance of conventional carbon fibers. Moreover, adhesion of other cells was not influenced by carbon fiber dimensions. To determine properties that selectively enhanced osteoblast adhesion, similar cell adhesion assays were performed on poly-lactic-co-glycolic (PLGA) casts of carbon fiber compacts previously tested. Compared to PLGA casts of conventional carbon fibers, results provided the first evidence of enhanced select osteoblast adhesion on PLGA casts of nanophase carbon fibers. The summation of these results demonstrate that due to a high degree of nanometer surface roughness, carbon fibers and PLGA with nanometer surface dimensions may be optimal materials to selectively increase osteoblast adhesion necessary for successful orthopedic implant applications.

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