Computational Investigation of Large-Diameter Carbon Nanotubes in Bundles for High-Strength Materials

2020 ◽  
Vol 3 (6) ◽  
pp. 5014-5018 ◽  
Author(s):  
Chinomso Onuoha ◽  
Grigorii Drozdov ◽  
Zhiyong Liang ◽  
Gregory M. Odegard ◽  
Emilie J. Siochi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Large Diameter ◽  
High Strength ◽  
Computational Investigation

scholarly journals Progress in Research on Carbon Nanotubes Reinforced Cementitious Composites

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Qinghua Li ◽  
Jintao Liu ◽  
Shilang Xu
Keyword(s):  
Carbon Nanotubes ◽  
Large Scale ◽  
High Strength ◽  
Cementitious Composites ◽  
Scale Production ◽  
Multiwalled Carbon ◽  
Factors Affecting ◽  
Environment And Health ◽  
Research Activities ◽  
Major Factors

As one-dimensional (1D) nanofiber, carbon nanotubes (CNTs) have been widely used to improve the performance of nanocomposites due to their high strength, small dimensions, and remarkable physical properties. Progress in the field of CNTs presents a potential opportunity to enhance cementitious composites at the nanoscale. In this review, current research activities and key advances on multiwalled carbon nanotubes (MWCNTs) reinforced cementitious composites are summarized, including the effect of MWCNTs on modulus of elasticity, porosity, fracture, and mechanical and microstructure properties of cement-based composites. The issues about the improvement mechanisms, MWCNTs dispersion methods, and the major factors affecting the mechanical properties of composites are discussed. In addition, large-scale production methods of MWCNTs and the effects of CNTs on environment and health are also summarized.

Multiwall carbon nanotubes: A review on synthesis and applications

2021 ◽  
Vol 11 ◽  
Author(s):  
Manisha Vijay Makwana ◽  
Ajay M Patel
Keyword(s):  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Arc Discharge ◽  
Multiwall Carbon Nanotubes ◽  
High Strength ◽  
Energy Storage And Conversion ◽  
Synthesis Methods ◽  
Mechanical And Thermal Properties ◽  
Nano Materials ◽  
Flexible Sensors

: MWCNTs are elongated cylindrical nanoobjects made of sp2 carbon. They have a diameter of 3–30 nm and can grow to be several centimetres long. Therefore, their aspect ratio can range between 10 to 10 million. Carbon nanotubes are the foundation of nanotechnology. It is an exceptionally fascinating material. CNTs possess excellent properties such as mechanical, electrical, thermal, high adsorption, outstanding stiffness, high strength and low density with a high aspect ratio. These properties can be useful in the fabrication of revolutionary smart nano materials. Demand for lighter and more robust nano materials in different applications of nanotechnology is increasing every day. Various synthesis techniques for the fabrication of MWCNTs, such as CVD, Arc discharge, flame synthesis, laser ablation, and spray pyrolysis, are discussed in this review article, as are their recent applications in a variety of significant fields. The first section presents a brief introduction of CNTs, then the descriptions of synthesis methods and various applications of MWCNTs in the field of energy storage and conversion, biomedical, water treatment, drug delivery, biosensors, bucky papers and resonance-based biosensors are introduced in the second section. Due to their improved electrical, mechanical, and thermal properties, MWCNTs have been extensively used in the manufacturing and deployment of flexible sensors.

The Design, Development and Validation of an Innovative High Strength, Self Monitoring, Composite Pipe Liner for the Restoration of Energy Transmission Pipelines

2006 ◽  
Author(s):  
Kyle Bethel ◽  
Steven C. Catha ◽  
Melvin F. Kanninen ◽  
Randall B. Stonesifer ◽  
Ken Charbonneau ◽  
...  
Keyword(s):  
High Pressures ◽  
Large Diameter ◽  
Cylindrical Tube ◽  
High Strength ◽  
Design Development ◽  
Energy Transmission ◽  
Engineering Research ◽  
Wide Range ◽  
Transmission Pipelines

The research described in this paper centers on a composite of thermoplastic materials that can be inserted in a degraded steel pipe to completely restore its strength. Through the use of fabrics consisting of ultra high strength fibers that are co-helically wrapped over a thin walled thermoplastic cylindrical tube that serves as a core, arbitrarily high pressures can be achieved. This paper first outlines the design, manufacturing and installation procedures developed for this unique material to provide a context for the engineering research. Based on this outline, the technological basis that has been developed for assuring the strength and long term durability of this concept during its insertion, and in its very long term service as a liner in energy transmission pipelines, is presented in detail. The research that is described includes burst testing of the material in stand alone pipe form, load/elongation testing of ultra high strength fabrics, and linear and nonlinear elastic and viscoelastic analysis models. This body of work indicates that the concept is fundamentally feasible for restoring a wide range of large diameter natural gas and liquid transmission pipelines to be able to carry arbitrarily high pressures over very long lifetimes. It also indicates that liners can be safely installed in long lengths even in lines with severe bends in a continuous manner. With further research the concept has the potential for eliminating hydro testing and smart pigging during service, and could possibly be installed in some lines that are currently unpiggable.

Environmental effects on large diameter high-strength rods for structural applications

2018 ◽  
Vol 83 ◽  
pp. 230-238 ◽  
Author(s):  
Mihaela Iordachescu ◽  
Mariángel Pérez-Guerrero ◽  
Andrés Valiente ◽  
Manuel Elices
Keyword(s):  
Environmental Effects ◽  
Large Diameter ◽  
High Strength ◽  
Structural Applications

Effect of ozone exposure on the electrical characteristics of high-purity, large-diameter semiconducting carbon nanotubes

2014 ◽  
Vol 16 (22) ◽  
pp. 10861-10865 ◽  
Author(s):  
Jia Gao ◽  
Yueh-Lin Loo
Keyword(s):  
Carbon Nanotubes ◽  
High Purity ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Large Diameter ◽  
Ozone Exposure ◽  
Electrical Characteristics

Presorted, semiconducting carbon nanotubes in the channels of field-effect transistors undergo simultaneous p-doping and oxidation during ozone exposure.

Diketopyrrolopyrrole (DPP)-Based Donor-Acceptor Polymers for Selective Dispersion of Large-Diameter Semiconducting Carbon Nanotubes

Small ◽  
2015 ◽  
Vol 11 (24) ◽  
pp. 2946-2954 ◽  
Author(s):  
Ting Lei ◽  
Ying-Chih Lai ◽  
Guosong Hong ◽  
Huiliang Wang ◽  
Pascal Hayoz ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Large Diameter ◽  
Donor Acceptor

Flipping Carbon Nanotubes to Continuously Produce Strong, Transparent, Multifunctional Sheets

2005 ◽  
Author(s):  
Mei Zhang ◽  
Shaoli Fang ◽  
Anvar A. Zakhidov ◽  
Sergey B. Lee ◽  
Ali E. Aliev ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Nanotube Arrays

We demonstrate carbon nanotube assembly by cooperatively rotating carbon nanotubes in vertically-oriented nanotube arrays (forests) and make 5-centimeter-wide, meter-long transparent sheets. These self-supporting nanotube sheets are initially formed as a highly anisotropic electronically conducting aerogel that can be densified into strong sheets that are as thin as 50 nanometers. The measured gravimetric strength of orthogonally oriented sheet arrays exceeds that of high strength steel sheet.

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