Lunar Elevator

Scientists at Columbia University conducted a study which revealed that graphene retains most of its mechanical properties even when it has been stitched together from small fragments. This discovery may have been the first step toward large scale manufacture of carbon nanotubes, which could be essential in the manufacturing of the first space elevator, light – strong materials, and flexible electronics.

At the present moment, a practical breakthrough in the construction of a lunar elevator has not been realized. However, many scientists have performed experiments which show it will be possible through use of graphene. In these experiments, they have measured the strength of the microscopic carbon nanotube and proved it can indeed support the construction of such elevators.

The space elevator ribbon is constructed out of carbon nanotubes, which are at least 100 times stronger than steel but have flexibility equal to that of plastic. Scientists will only be able to make the ribbon to be used in the space elevator if they manage to make fibers out of carbon nanotubes. In the recent experiments, the materials that were involved were neither strong nor flexible enough to form such a ribbon.

Graphene ribbons have a very high tensile strength and very high elastic modulus, theoretically they are said to make the process of building a space elevator easy. There are two major ways that a lunar elevator ribbon can be built: in the first case a long carbon tube ideally several meters long will be braided into a rope like structure, and in the second case a shorter nanotube will be placed in a selected polymer matrix.

So far graphene is the ideal material for construction of the ribbon, the carbon-carbon bond in graphene is at least 0.142 nm. Scientists have proved that two sheets of graphene are held together by much stronger van de Waals forces than bulk Graphene.

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Manufacturers will soon be able to replace silicon with carbon nanotube transistors in making transistors used in electronic devices. This is because carbon nanotubes address most of the shortcomings that silicon has. Carbon nanotubes are the ideal replacements for silicon since they exist in several allotropes — each of which have a high potential.

Carbon nanotube transistors

Recently, researchers successfully demonstrated a working computer based on carbon nanotube transistors, instead of the conventional silicon ones. This promises much smaller devices that will be exceedingly fast while consuming very low power. Initially, researchers made individual transistors from carbon nanotubes, and later advanced to making simple electronic circuits. Eventually, they interconnected the transistors to form a low-powered “Turing complete” computer from these carbon nanotube transistors.

While this demonstration cannot be considered as a breakthrough, it can be viewed as the first fundamental steps to exploring with precision the possibilities of replacing silicon in the manufacture of semiconductors. It shows that carbon nanotube transistors can make a universal computer, just like silicon.

Some of the advantages of using carbon nanotube transistors to make computers in place of silicon are that these computers will be ever more powerful, much faster and cheaper than conventional ones. They also require less power to operate that the existing ones.

Since any new technology unveiled must meet the thorough factory processes that constitute the modern semiconductor industry, it might take not less than three years for this technology to be tested and perfected before it hits the market. Some companies such as I.B.M are already wary that silicon might cease to scale down further in its use for the manufacture of transistors. These companies have, therefore, turned to the possibility of using carbon nanotubes. This computer was made in accordance with the standard industry requirements such as those used to make silicon transistors. This means that it will be possible to manufacture hybrid chips from carbon nanotubes and silicon in certain locations/proportions to extend the use of silicon.

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Over the last four decades, we have been envisioning the end to the use of silicon as a semiconductor in devices. Perhaps the end is near. Just what will replace silicon? The answer to that is a carbon nanotube.

 What are carbon nanotubes?

These are tube-shaped carbon-made materials that have very small diameters measured using the

Carbon nanotubes

nanometer scale. This scale has one billion units of a meter. Approximately, the human hair is nine ten-thousandth times thicker than one unit in the nanometer scale. Carbon nanotubes are so thin that thousands of them can fit when arranged side-by-side in the human air.

Carbon nanotubes are made of graphite layers that appear like a rolled-up chicken wire. The structure closely resembles the continuous unbroken hexagonal wire, with the carbon molecules pegged at the apexes of hexagonal patterns.

While all carbon nanotubes are made from a similar graphite sheet, the fact that they have different characteristics makes them differ in terms of electrical conductivity. This results in some acting as metals while others act as semiconductors. Some of the differing characteristics include their structures, length, thickness, and number of layers.

Typically, carbon nanotubes’ diameter vary between <1 nm and 50 nm as a group while their lengths measure several microns. Recently, advancements have made carbon nanotubes longer by advancements, making them measurable in centimeters. Carbon nanotubes are classified according to their structures:

Single-walled carbon nanotubes

Double-walled nanotubes

Multi-walled carbon nanotubes

Properties

Carbon nanotubes have intrinsic mechanical and transport properties making them ideal for ultimate carbon fibers. Carbon nanotubes exhibit a unique mix of stiffness, tenacity and strength when compared with other materials often used to make fiber. These other fiber materials usually lack at least one of these properties. The carbon nanotubes are also unmatched when it comes to thermal and electrical conductivity.

Some of the Applications

Extra strong fibers

Technical textiles

Ultra-capacitors

Biosensors

Antifouling paint

Storing gases

Flat-panel displays

Conductive plastics

Improved life batteries

Nano-electronics

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