Skip to main content

Brief Summary of Multi-Walled Carbon Nanotubes Properties and Applications

Carbon nanotubes are materials that possess remarkable properties and offer extraordinary possibilities. This article gives a brief overview of the physico-chemical nature and characterization of multi-walled carbon nanotubes (MWNTs).
Single-walled carbon nanotubes and multi-walled carbon nanotubes share some similarities, but also some of significant differences. Multi-walled carbon nanotubes can be thought of as a series of single walled tubes nested within one another. There may be as few as 2, or as many as 100 plus concentric walls. Their diameters may, therefore, be as great as 50nm as opposed to 0.7 - 2.0 nm for a typical single-walled carbon nanotubes. Just the outer wall generally contributes to the electrical and mechanical properties of multi-walled carbon nanotubes when used in composites, for example, affording the opportunity for much lower loading of single-walled carbon nanotubes versus multi-walled carbon nanotubes.
Multi-walled carbon nanotubes have excellent properties and are being employed in a large number of commercial applications. The properties of multi-walled carbon nanotubes are:
Physical: Defect–free, individual, multi-walled carbon nanotubes have an excellent tensile strength and when integrated into a composite, such as a thermoplastic or thermoset compounds, can significantly increase its strength.
Electrical: Multi-walled carbon nanotubes are highly conductive when properly integrated into a composite structure. One must note that the outer wall alone is conducting; the inner walls are not instrumental to conductivity.
Chemical: Multi-walled carbon nanotubes are an allotrope of sp2 hybridized carbon similar to graphite and fullerenes and as such have high chemical stability. However, one can functionalize the nanotubes to enhance both the strength and dispersibility of composites.
Thermal: Multi-walled carbon nanotubes have a thermal stability more than 600 °C, based on the level of defects and to certain extent on the purity as residual catalyst in the product can catalyze decomposition.                                                  

Applications of multiple-walled carbon nanotubes:
Multi-walled carbon nanotubes are used in additives in polymers
Multi-walled carbon nanotubes are used in wafer processing fabrication.
Multi-walled carbon nanotubes are used in RFI shielding materials.
Multi-walled carbon nanotubes are used in water filtration membranes.
Multi-walled carbon nanotubes are used in electron field emitters for cathode ray lighting elements.

Labels:

Comments

Post a Comment

Popular posts from this blog

Molybdenum Trioxide Nanoparticles/Nanopowder and Applications

General Information about Molybdenum Trioxide                                                     Molybdenum trioxide is chemical compound with the formula MoO3. Its chief application is as an oxidation catalyst and as a raw material for the production of molybdenum metal.  Molybdenum Trioxide  is a very light blue powder. Molybdenum Trioxide Nanoparticles/Nanopowder and Their Applications                                                    Like many  nanoparticles/nanopowder , Molybdenum Trioxide nanoparticles/nanopowder are used as catalysts. These catalysis reactions include hydrogenation catalysis and cracking catalysis. Molybdenum Trioxide nanoparticles/  nanopowder are useful for...
Post a Comment
Read more

Hydroxyapatite Nanopowders and Their Applications

Hydroxyapatite, is a naturally occurring mineral form of calcium apatite with the formula Ca 5 (PO 4 ) 3 (OH). Pure hydroxyapatite powder is white. Naturally occurring apatites can, however, also have brown, yellow, or green colorations, comparable to the discolorations of dental fluorosis. Hydroxyapatite Nanopowder/Nanoparticles (50 nm, 99.95+%)  has been widely used as a biocompatible ceramic in many areas of medicine, but mainly for contact with bone tissue, due to its resemblance to mineral bone. In mammals, the skeleton presents a carbonated and partially substituted apatite, based on nanocrystal aggregates, and associated with collagen, building up 3-D structures present in various bone tissue conformations like trabecular or cancellous bone. There has been growing interest in developing bioactive synthetic ceramics that could closely mimic natural apatite characteristics. As mentioned before,  Hydroxyapatite Nanopowder  is the main inorganic constituent of bon...
Post a Comment
Read more

Rundown about Silicon Oxide Wafer

The main insulating material used in micro-technology is Silicon Dioxide, which in chemical symbols is written as SiO2. In semiconductor technology, SiO2 thin film layers are mainly used as dielectric material film in transistors, capacitors (DRAM) or flash-memories. Silicon Oxide Wafers are produced using crystallization, solid state and other ultra-high purification processes such as sublimation. This process forms a cylindrical ingot, which is then sliced and polished to form wafers. Thermal oxide is a kind of "grown" oxide layer, compared to CVD deposited oxide layer, it has a higher uniformity, and higher dielectric strength, it is an excellent dielectric layer as an insulator . In most silicon- based devices, thermal oxide layer play an important role to pacify the silicon surface to act as doping barriers and as surface dielectrics. The simplest way to produce an insulating silicon oxide layers (SiO2) on silicon wafers is to oxidize silicon with oxygen, which ...
Post a Comment
Read more