Multi-stage fatigue life monitoring on quasi-isotropic carbon fibre reinforced polymers enhanced with multi-wall carbon nanotubes: parallel use of electrical resistance, acoustic emission, and acousto-ultrasonic techniques

2009 ◽  
Author(s):  
V. Kostopoulos ◽  
A. Vavouliotis ◽  
T. Loutas ◽  
P. Karapappas
Keyword(s):  
Carbon Nanotubes ◽  
Acoustic Emission ◽  
Fatigue Life ◽  
Electrical Resistance ◽  
Reinforced Polymers ◽  
Multi Wall Carbon Nanotubes ◽  
Multi Stage ◽  
Carbon Fibre Reinforced Polymers ◽  
Ultrasonic Techniques ◽  
Isotropic Carbon

scholarly journals Multi-Wall Carbon Nanotubes Chemically Grafted and Physically Adsorpted on Reinforcing Carbon Fibres

2008 ◽  
Vol 17 (3) ◽  
pp. 096369350801700 ◽  
Author(s):  
P. Karapappas ◽  
S. Tsantzalis ◽  
E. Fiamegou ◽  
A. Vavouliotis ◽  
K. Dassios ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Acid Solution ◽  
Matrix Material ◽  
Carbon Fibres ◽  
Reinforced Polymers ◽  
Reinforcing Effect ◽  
Multi Wall Carbon Nanotubes ◽  
The Matrix ◽  
Carbon Fibre Reinforced Polymers

Carbon nanotubes (CNTs) because of their properties are alleged to be the key candidate additives for improving the mechanical properties of polymers and carbon fibre reinforced polymers (CFRPs). Nevertheless in order for the reinforcing effect of the nanotubes to be of practical use, the CNTs have to be mixed with the matrix material. In the current work an effort was made to chemically graft Multi-Wall Carbon Nanotubes (MWCNTs) on the actual reinforcing Carbon Fibres (CFs) in order to skip the sometimes complex mixing stage. Two different solutions were used in order to treat/prepare the CNTs; a) an acid solution of H2SO4/HNO3 and, b) a toluene solution. The treated CFs were added to each solution, sonic bathed with deionised water and then dried in an oven. The resulting CFs were examined under SEM and both the solutions used proved to be reasonable successful with further investigation/optimisation to be necessary.

Multistage fatigue life monitoring on carbon fibre reinforced polymers enhanced with multiwall carbon nanotubes

2009 ◽  
Vol 38 (2-4) ◽  
pp. 124-130 ◽  
Author(s):  
A. Vavouliotis ◽  
P. Karapappas ◽  
T. Loutas ◽  
T. Voyatzi ◽  
A. Paipetis ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fatigue Life ◽  
Carbon Fibre ◽  
Multiwall Carbon Nanotubes ◽  
Reinforced Polymers ◽  
Carbon Fibre Reinforced Polymers ◽  
Multiwall Carbon

Electrodes made of multi-wall carbon nanotubes on PVDF-filters have low electrical resistance and are able to record electrocardiograms in humans

2016 ◽  
Vol 166 ◽  
pp. 10-14 ◽  
Author(s):  
Juan Bernal-Martínez ◽  
Alberto Seseña-Rubfiaro ◽  
Rafael Godínez-Fernández ◽  
Alfredo Aguilar-Elguezabal
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Resistance ◽  
Multi Wall Carbon Nanotubes

scholarly journals Passive Vibration Damping of Composite Laminates by a Combination of Tough Interleaves and Resistively Shunted Piezoelectric Ceramics

1998 ◽  
Vol 7 (2) ◽  
pp. 096369359800700 ◽  
Author(s):  
Andreas Radtke ◽  
Toshio Tanimoto ◽  
Klaus Friedrich
Keyword(s):  
Composite Laminates ◽  
Fem Simulation ◽  
Piezoelectric Ceramics ◽  
Vibration Damping ◽  
Reinforced Polymers ◽  
Cfrp Laminates ◽  
Resonance Frequencies ◽  
Carbon Fibre Reinforced Polymers ◽  
Strength And Stiffness ◽  
Isotropic Carbon

Quasi-isotropic carbon fibre reinforced polymers (CFRP) are widely used as structural materials in aerospace structures or other fields of engineering. They provide excellent strength and stiffness at low density, but their vibration damping capabilities are very low, making their application in vibration-subjected structures not efficient. This study deals with the improvement of the damping capabilities of quasiisotropic CFRP laminates by passive damping methods using both tough interleaves in the stacking sequence and surface bonded piezoelectric ceramics. Furthermore an analytical method for the calculation of loss factors and resonance frequencies for such laminates is introduced. The experimental results were also confirmed by a FEM-simulation.

scholarly journals Influence of Powder and Liquid Multi-Wall Carbon Nanotubes on Hydration and Dispersion of the Cementitious Composites

2020 ◽  
Vol 10 (21) ◽  
pp. 7948
Author(s):  
Gun-Cheol Lee ◽  
Youngmin Kim ◽  
Seongwon Hong
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Resistance ◽  
Cementitious Composites ◽  
Self Monitoring ◽  
Multi Wall Carbon Nanotubes ◽  
Uniform Dispersion ◽  
Multi Walled Carbon Nanotubes ◽  
Dispersion Solution ◽  
Walled Carbon Nanotubes ◽  
Scanning Electron

Two types of multi-walled carbon nanotubes (MWCNTs), powder and liquid, were added to cementitious composites to build self-sensing concrete. To properly evaluate and quantify the effect of MWCNTs on electrical resistance, various tests, including isothermal conduction calorimetry, were carried out. One of primary issues of self-monitoring concrete is dispersion, so ultrasonication was used to properly mix the CNTs in the dispersion solution, and silica fume was employed to make the specimens. Scanning electron microscopy (SEM), Raman spectroscopy, and porosity analyses were performed to investigate the physical properties of the composites and to confirm uniform dispersion. The distance of the electrical resistance was also measured, and the dosages and types of MWCNTs were analyzed.

Effect of Nanotube Aspect Ratio on Chemical Vapour Sensing Properties of Polymer/MWCNT Composites

2012 ◽  
Vol 21 ◽  
pp. 117-123 ◽  
Author(s):  
G. Sakale ◽  
D. Jakovlevs ◽  
I. Aulika ◽  
Maris Knite
Keyword(s):  
Carbon Nanotubes ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Electrical Resistance ◽  
Chemical Vapour ◽  
Length Change ◽  
Resistance Change ◽  
Sensing Properties ◽  
Multi Wall Carbon Nanotubes ◽  
Volatile Organic

The main topic of this paper is the study of polyisoprene-multi wall carbon nanotubes (PiMWCNT) composites electrical conductivity and volatile organic compound sensing properties with respect to type of multi wall carbon nanotubes used. Electrical percolation parameters like percolation threshold and critical exponent of produced composites are determined and analyzed. PiMWCNT composites exhibit a promising sensitivity to the presence of volatile organic compounds. Therefore the composites sensing mechanism of volatile organic compounds are analyzed in more detail by applying an original measuring technique which enables simultaneous measurement of an electrical resistance, mass and length change measurement of the sample in the presence and subsequent absence of a vapour. Measurement results enabled the evaluation of both vapour diffusion behavior in the composite and electrical resistance change mechanism.

Damage Detection in Epoxy Embedded Carbon Nanotubes Using Electrical Resistance and Acoustic Emission

2017 ◽  
Vol 7 (3) ◽  
pp. 06017001 ◽  
Author(s):  
Joshua P. Stuckey ◽  
Vijaya B. Chalivendra ◽  
Mulugeta A. Haile ◽  
Asha J. Hall
Keyword(s):  
Carbon Nanotubes ◽  
Acoustic Emission ◽  
Damage Detection ◽  
Electrical Resistance

scholarly journals Beneficial effect of multi-wall carbon nanotubes on the graphitization of polyacrylonitrile (PAN) coating

2010 ◽  
Vol 4 (2) ◽  
pp. 59-62 ◽  
Author(s):  
Mária Darányi ◽  
Tamás Csesznok ◽  
István Sarusi ◽  
Ákos Kukovecz ◽  
Zoltán Kónya ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Beneficial Effect ◽  
Spin Coating ◽  
Electrical Resistance ◽  
Precursor Solution ◽  
Specific Electrical Resistance ◽  
Multi Wall Carbon Nanotubes ◽  
Electrically Conducting ◽  
N2 Atmosphere ◽  
Product Film

Polyacrylonitrile (PAN) solutions were deposited on quartz plates by spin coating to yield 2-3 ?m thick PAN films. The films were decomposed at 1000?C in N2 atmosphere into electrically conducting carbonaceous coatings. When the precursor solution contained cobalt (0.2 g Co-acetate per 1 g PAN) and/or multi-wall carbon nanotubes (MWCNTs, 2 mg MWCNT per 1 g PAN) the specific electrical resistance of the product film dropped from the original 492 ??cm-1 value down to 46 ??cm-1. By excluding all other possibilities we came to the conclusion that the beneficial effect of carbon nanotubes is related to their catalytic action in the final graphitization of condensed nitrogen-containing rings into graphitic nanocrystallites.

Incorporation of Multi Wall Carbon Nanotubes into Glass-Surfaces via Laser-Treatment

2003 ◽  
Vol 772 ◽  
Author(s):  
T. Seeger ◽  
G. de la Fuente ◽  
W.K. Maser ◽  
A.M. Benito ◽  
A. Righi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Continuous Wave ◽  
Silica Surface ◽  
Multi Wall Carbon Nanotubes ◽  
Composite Formation ◽  
Multi Walled Carbon Nanotubes ◽  
Glass Surfaces ◽  
Walled Carbon Nanotubes ◽  
First Time ◽  
Scanning Electron

AbstractCarbon nanotubes (CNT) are interesting candidates for the reinforcement in robust composites and for conducting fillers in polymers due to their fascinating electronic and mechanical properties. For the first time, we report the incorporation of multi walled carbon nanotubes (MWNTs) into silica-glass surfaces by means of partial surface-melting caused by a continuous wave Nd:YAG laser. MWNTs were detected being well incorporated in the silica-surface. The composites are characterized using scanning electron microscopy (SEM) and Raman-spectroscopy. A model for the composite-formation is proposed based on heatabsorption by MWNTs and a partial melting of the silica-surface.

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