Patterned Carbon Nanotube Growth on Convex Cylindrical Stainless Steel Substrates for the Production of Coronary Stents

2016 ◽  
Author(s):  
Warren Robison ◽  
Brian Jensen ◽  
Anton Bowden
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Carbon Nanotube ◽  
Standard Deviation ◽  
Coronary Stents ◽  
Free Standing ◽  
Type Pattern ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Steel Substrates

This paper reports research in fabrication of cylindrical stents using carbon-infiltrated carbon nanotubes (CI-CNT), a material with good hemocompatibility. We demonstrate growth of CI-CNT forests in patterned lines on a 3 mm diameter stainless steel (SS) rod. Lines were patterned parallel, at 7°, at 45°, and perpendicular relative to the axis of the rod. Minimal cracking was seen in the parallel and angled lines. Significant cracking was seen in the perpendicular lines and we attempted to characterize the cracking in order to correlate it to width of the lines and height of the forest. No correlation was found but the average uncracked length was determined to be 414 μm with a standard deviation of 67 μm. We also demonstrate successful growth with minimal cracking of CI-CNT forests in a zig-zag type pattern in an effort to further the possibility of creating a coronary stent utilizing CI-CNT. Some of the patterned samples were also removed from the cylindrical substrate, resulting in free-standing, patterned, cylindrical patterns made from CI-CNT.

Carbon Nanotube Growth on Different Types of Tool Steel Substrates

2007 ◽  
Vol 1057 ◽  
Author(s):  
Gulfem Ipek Nasuf ◽  
Max Yen
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Tool Steel ◽  
Hydrogen Gas ◽  
Growth Surface ◽  
Gas Treatment ◽  
Different Types ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Steel Substrates

ABSTRACTThis paper investigates the effectiveness of different pretreatment methods applied on M50, M35, and W4 type of tool steel substrates for direct growth of carbon nanotubes. The pretreatments explored include treatment with sand paper polishing, nitric acid (HNO3) etching, and high temperature hydrogen gas treatment. Furthermore, in order to establish a correlation between the steel surface average roughness value and the carbon nanotube growth, surface topography of steel substrates created by mechanical polishing were measured before actual growth process. Grown carbon nanostructures were shown by SEM and TEM to be multi-walled carbon nanotubes (MWCNTs) and vapor grown carbon nanofibers (VGCFs). It was found that under the same pretreatment conditions, even when the same roughness values were achieved and the same thermal chemical vapor deposition conditions were applied, grown nanostructures on different types of tool steel substrates showed dissimilarity.

Patterned Carbon Nanotube Growth on Stainless Steel

2018 ◽  
Author(s):  
Daniel G. Prawitt ◽  
Danni Porter ◽  
Brian D. Jensen
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Carbon Nanotube ◽  
Silicon Wafer ◽  
Steel Surface ◽  
316L Stainless Steel ◽  
Stainless Steel Surface ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
First Time

This paper presents, for the first time, the process of growing a pattern of carbon nanotubes (CNT(s)) on 316L stainless steel. The data presented is preliminary and requires further investigation to detail the growth behaviors of CNTs on stainless steel in regards to producing a pattern. However, this article presents the viability of producing a pattern on a stainless steel surface that can be used in bio-surfacing and electronic applications, among others. The results show that producing a CNT pattern on stainless steel can be achieved in a similar manner to that of producing a CNT pattern on a silicon wafer, with some vital differences in the photolithography and growth processes. The results also show that long CNT growth can lead to partial overgrowth of the pattern.

scholarly journals Free energy surface of initial cap formation in carbon nanotube growth

2021 ◽  
Author(s):  
Satoru Fukuhara ◽  
Yasushi Shibuta
Keyword(s):  
Carbon Nanotubes ◽  
Free Energy ◽  
Carbon Nanotube ◽  
Energy Surface ◽  
Catalyst Surface ◽  
Important Process ◽  
Free Energy Surface ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Carbon Network

Initial cap formation is an important process of carbon nanotubes (CNTs) growth where hexagonal carbon network is lifted off from the catalyst surface. In this study, free energy surface (FES)...

Reactor Scale Model of Multiwalled Carbon Nanotube Growth in a Tube Flow Chemical Vapor Deposition Reactor

2009 ◽  
Author(s):  
Jeffrey J. Lombardo ◽  
Wilson K. S. Chiu
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotubes ◽  
Computational Models ◽  
Chemical Vapor ◽  
Scale Model ◽  
Tube Flow ◽  
Multiwalled Carbon ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

Even though a large number of applications for multiwalled carbon nanotubes have been proposed, there is relatively limited knowledge about the optimal conditions in which to create multiwalled carbon nanotubes (MWNTs). Computational models have been shown to be a promising tool to determine the best carbon nanotube growth conditions. In this paper the growth of MWNTs in a tube flow CVD reactor was studied through the use of the commercial software package COMSOL, where details steps have been described to reformulate an existing single walled carbon nanotube (SWNT) growth model to accommodate MWNTs followed by validation and growth rate prediction. Higher growth rates were predicted for MWNTs than SWNTs which is a result of the increase in pathways for carbon to form carbon nanotubes based on the additional walls. Results indicate that selecting the correct number of walls can be important to the results of the model.

Ni-Fe Competition in the Catalytic Growth of Carbon Nanotubes

2006 ◽  
Vol 963 ◽  
Author(s):  
Vladimir. Z. Mordkovich ◽  
D. N. Kharitonov ◽  
I. A. Maslov ◽  
E. B. Mitberg
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Carbon Nanostructures ◽  
Oxidation Process ◽  
Steel Alloy ◽  
Catalytic Growth ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Perovskite Type

ABSTRACTThe paper presents the results of competitive catalysis investigation of the carbon nanotube growth in situ of the partial oxidation process of methane. The competition between Ni and Fe results in suppression of Ni catalytic activity and the growth of Fe-capped carbon nanotubes. The discrimination is so strong that iron is segregated from Ni-Fe based stainless steel alloy leaving characteristic Ni-enriched corrosion caverns. The process strongly depends on temperature. Depending on particular catalyst bed composition, the nanotubes of various morphology may occur. In particular, the use of perovskite-type catalyst leads to formation of “olive-branch”-like peculiar carbon nanostructures.

Carbon Nanotube Growth from Nanoscale Clusters Formed by Ion Implantation

2005 ◽  
Vol 908 ◽  
Author(s):  
Yongho Choi ◽  
Jennifer Sippel Oakley ◽  
Andrew Rinzler ◽  
Ant Ural
Keyword(s):  
Thin Films ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Ion Implantation ◽  
Silicon Dioxide ◽  
Small Diameter ◽  
Iron Ions ◽  
Nanoscale Clusters ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

AbstractWe have demonstrated that iron ions implanted into silicon dioxide thin films form nanoscale clusters which can act as catalyst for carbon nanotube growth. We have implanted iron ions with an energy of 60 keV and three different doses (1014, 1015, and 1016 cm-2) into silicon dioxide thin films thermally grown on silicon substrates. We then used chemical vapor deposition (CVD) to grow carbon nanotubes on these ion implanted substrates with methane as the precursor gas. We studied the effect of ion implantation dose on the structural properties of the nanoscale clusters, as well as the carbon nanotubes nucleated from these clusters. The nanoscale clusters and grown nanotubes were characterized by Atomic Force Microscopy and Raman spectroscopy. The electrical characteristics of the as-grown nanotubes were also characterized. We found that growth of low density, horizontal, and small diameter carbon nanotubes on silicon dioxide is possible using this nucleation technique.

Functionalisation of Microfluidic Channels with In Situ Grown Carbon Nanotubes

2005 ◽  
Vol 872 ◽  
Author(s):  
K. Gjerde ◽  
T. Schurmann ◽  
K.B.K. Teo ◽  
M. Aono ◽  
W.I. Milne ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Surface Properties ◽  
Microfluidic Channels ◽  
Electrical Field ◽  
Multiwalled Carbon ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Local Distortions

AbstractWe present a new route towards customizing the surface properties of microfluidic channels, by a forest of in situ grown multiwalled carbon nanotubes (CNT). Local distortions of the electrical field direction are used to control the direction of the carbon nanotube growth.

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