CARBON NANOTUBSINTRODUCTIONThe advancement of materials science over the past decade has allowed scientists to create two carbon structures, namely carbon nanotubes and carbon nanowires. Nanowires are small wires with a diameter of 1 nanometer. These are used to build tiny transistors with greater efficiency for computer chips and other electronic devices. Over the past couple of years, carbon nanotubes have somewhat overshadowed nanowires. A carbon nanotube is a cylinder filled with carbon atoms. To put it in simpler words, nanotubes are simply sheets of hexagonal-shaped carbon atoms. If this sheet is rolled into a cylinder shape, a carbon nanotube is obtained. The properties of this carbon nanotube depend on how the sheet is rolled. Although they are formed from the same graphite sheet, their properties depend on variations in length, thickness, type of helical structure and number of layers. Carbon nanotubes with their amazing resistance, thermal and electrical properties are poised to have a significant impact on future materials science, electronics and nanotechnology. Thanks to their specialized structures, carbon nanotubes can be used to create very thin energy storage devices that could provide a new dimension and replace the capacitors and batteries that exist now. Carbon nanotube research is making progress discovering new shapes, applications, and solar thermal storage is the result of one such research.TYPES OF CARBON NANOTUBESingle-walled carbon nanotubes (SWNTs)A sheet of graphite rolled into a tube with a single cylindrical wall is called a SWNT. These are normally closed at the ends. They have a diameter close to 1 nm. However they come in different...... halves of the card......and the length of time they might store it and these can be independently controlled. The basic principle of thermochemical solar energy storage is that it uses a molecule whose structure changes with exposure to sunlight and which can remain stable in that form for a long time. By disturbing it with a stimulus, a catalyst, a small change in temperature or a flash of light, it can quickly regain its original shape by releasing the stored energy in the form of heat. The main advantage of this approach to harness solar energy is that the process is simplified by combining energy collection and storage in a single step. This process is robust, stable and economical. A limitation of this process is that, while it is useful for heating applications, producing electricity would require another step using thermoelectric devices or producing steam to run a generator.