High Molecular Weight Polyethylene Nanospheres: Synthesis, Physical and Mechanical Properties—Second Harmonic Generation

2008 ◽  
Vol 8 (6) ◽  
pp. 2979-2982
Author(s):  
C. J. Hsu ◽  
L. W. Chang ◽  
S. Y. Miao ◽  
J. T. Lue
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Molecular Weight ◽  
Harmonic Generation ◽  
Signal Intensity ◽  
Second Harmonic ◽  
Physical And Mechanical Properties ◽  
Graphene Sheets ◽  
Multi Wall Carbon Nanotubes ◽  
Anharmonic Oscillation

The weak second harmonic light generating from carbon nanotubes are detected. The signal intensity closely related to the density of π-bonds attributed to the defects in the rolled graphene sheets, which is stimulated to have anharmonic oscillation as strongly affected by the environment. The intensities of SHG are diminished in order of well-aligned multi-wall carbon nanotubes (MWCNTs), randomly-aligned MWCNTs, and then to single-wall CNTs.

Effect of Multi-Wall Carbon Nanotubes on the Properties of Natural Rubber Nanocomposites

2013 ◽  
Vol 832 ◽  
pp. 338-343 ◽  
Author(s):  
Azira Abd. Aziz ◽  
A.I.H. Habibah Dayang ◽  
Abu Bakar Suriani ◽  
Mohamad Rusop Mahmood
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Natural Rubber ◽  
Mechanical Test ◽  
Chemical Properties ◽  
Tensile Modulus ◽  
Physical And Mechanical Properties ◽  
Volume Resistivity ◽  
Multi Wall Carbon Nanotubes ◽  
Initial Modulus

Multi-walled carbon nanotubes (MWNTs) were used to prepare epoxidised natural rubber (ENR) nanocomposites. Our attempt to achieve nanostructures in MWNTs/ENR nanocomposites were formed by incorporating carbon nanotubes in a polymeric solution. Using this technique, nanotubes can be dispersed homogeneously in the ENR matrix with an attempt to increase the mechanical properties of these nanocomposites. The properties of the nanocomposites such as volume resistivity, tensile strength and tensile modulus were studied. Mechanical test results show an increase in the initial modulus for up to 14 times in relation to pure ENR. In addition to mechanical testing, the dispersion state of the MWNTs into ENR was studied by field emission electron microscopy (FESEM) and atomic force microscope (AFM) in order to understand the morphology of the resulting system. According to the present study, application of the physical and mechanical properties of carbon nanotubes to ENR can result in rubber products which have improved mechanical, physical and chemical properties.

Second-harmonic Generation Microscopy of Carbon Nanotubes

2012 ◽  
Author(s):  
Mikko J. Huttunen ◽  
Olli Herranen ◽  
Andreas Johansson ◽  
Hua Jiang ◽  
Prasantha R. Mudimela ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Second Harmonic Generation Microscopy

scholarly journals Fabrication and Characterization of Polylactic Acid Electrospun Scaffolds Modified with Multi-Walled Carbon Nanotubes and Hydroxyapatite Nanoparticles

Biomimetics ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 43
Author(s):  
Athanasios Kotrotsos ◽  
Prokopis Yiallouros ◽  
Vassilis Kostopoulos
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Polylactic Acid ◽  
Physical And Mechanical Properties ◽  
Polymeric Materials ◽  
Cost Effective ◽  
Electrospinning Process ◽  
Wide Range ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The solution electrospinning process (SEP) is a cost-effective technique in which a wide range of polymeric materials can be electrospun. Electrospun materials can also be easily modified during the solution preparation process (prior SEP). Based on this, the aim of the current work is the fabrication and nanomodification of scaffolds using SEP, and the investigation of their porosity and physical and mechanical properties. In this study, polylactic acid (PLA) was selected for scaffold fabrication, and further modified with multi-walled carbon nanotubes (MWCNTs) and hydroxyapatite (HAP) nanoparticles. After fabrication, porosity calculation and physical and mechanical characterization for all scaffold types were conducted. More precisely, the morphology of the fibers (in terms of fiber diameter), the surface properties (in terms of contact angle) and the mechanical properties under the tensile mode of the fabricated scaffolds have been investigated and further compared against pristine PLA scaffolds (without nanofillers). Finally, the scaffold with the optimal properties was proposed as the candidate material for potential future cell culturing.

scholarly journals Time-Stability Dispersion of MWCNTs for the Improvement of Mechanical Properties of Portland Cement Specimens

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4149
Author(s):  
Laura M. Echeverry-Cardona ◽  
Natalia Álzate ◽  
Elisabeth Restrepo-Parra ◽  
Rogelio Ospina ◽  
Jorge H. Quintero-Orozco
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Portland Cement ◽  
Time Stability ◽  
Cement Pastes ◽  
Multi Wall Carbon Nanotubes ◽  
Vis Spectroscopy ◽  
The Stability ◽  
Over Time

This study shows the energy optimization and stabilization in the time of solutions composed of H2O + TX-100 + Multi-Wall Carbon Nanotubes (MWCNTs), used to improve the mechanical properties of Portland cement pastes. For developing this research, sonication energies at 90, 190, 290, 340, 390, 440, 490 and 590 J/g are applied to a colloidal substance (MWCNTs/TX-100 + H2O) with a molarity of 10 mM. Raman spectroscopy analyses showed that, for energies greater than 440 J/g, there are ruptures and fragmentation of the MWCNTs; meanwhile at energies below 390 J/g, better dispersions are obtained. The stability of the dispersion over time was evaluated over 13 weeks using UV-vis spectroscopy and Zeta Potential. With the most relevant data collected, sonication energies of 190, 390 and 490 J/g, at 10 mM were selected at the first and the fourth week of storage to obtain Portland cement specimens. Finally, we found an improvement of the mechanical properties of the samples built with Portland cement and solutions stored for one and four weeks; it can be concluded that the MWCNTs improved the hydration period.

Multifunctional Elastomer Nanocomposites based on EPDM and Carbon Nanotubes

2008 ◽  
Vol 1143 ◽  
Author(s):  
Paola Ciselli ◽  
Lan Lu ◽  
James JC Busfield ◽  
Ton Peijs
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Linear Relation ◽  
Pressure Sensors ◽  
Ethylene Propylene Diene Monomer ◽  
Electrical Behavior ◽  
Ethylene Propylene ◽  
Multi Wall Carbon Nanotubes ◽  
Sensor Applications ◽  
Elastomeric Composites

ABSTRACTElastomeric composites based on Ethylene-Propylene-Diene-Monomer (EPDM) filled with multi-wall carbon nanotubes (MWNTs) have been prepared, showing improved mechanical properties as compared to the pure EPDM matrix. The results have been discussed using the Guth model. The main focus of the study was on the electrical behavior of the nanocomposites, in view of possible sensor applications. A linear relation has been found between conductivity and deformations up to 10% strain, which means that such materials could be used for applications such as strain or pressure sensors. Cyclic experiments were conducted to establish whether the linear relation was reversible, which is an important requirement for sensor materials.

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