Photothermal And Light To Force Conversions In Single Carbon Nanocoils And Their Applications

Carbon nanocoils (CNCs) exhibit the more outstanding mechanical and electromagnetic properties than carbon nanotube due to their peculiar helical morphologies. They are expected for uses in nanosized springs, electromagnetic wave absorber, high-performance composites, etc. Install more intensive devices in a tiny area of MEMS will be a new directions for future research in various fields. This leads to the technology of directional operation of carbon nanocoils, especially, operating a single carbon nanocoil technology in the field of nano-mechanical becomes more and more meaningful. At present, the mechanical effects of optical tweezers based on the interaction with the number of micro and nano-level material can be used to implement achievedtwist, bend, stretch, and other operations to study the mechanical properties of single molecule.In this article optical tweezers laser-induced technology is used in the field of carbon nanocoil to explore the new applications of directional control of a single carbon nanocoil. It can lay the foundation in the field of nano-electromechanical. In our experiment, the incident laser beam direction is perpendicular to the long axis of the carbon nanocoil. By adjusting the loading platform of the single-beam optical tweezers system, will focus the laser spot center slightly shift the carbon nanocoil axis. In other words, a Laser beam is focused on the position over the axis of carbon nano-coil about1um. The study result shows that the mechanical effect of laser inducing a single carbonanocoil---attractive force or repulsive force, depends on the bending state of the carbon nanocoil and the relative position of the laser focusing spot. Then we put a long carbon nanocoil of which one end is fixed completely on carbon nanocoils aggregation into the aqueous solution. A periodic oscillation of carbon nanocoil is initiated in the water until the focusing is stop, because a long carbon nanocoil has a good flexibility and damping force in the water can not be ignored.Nanomaterials exhibit outstanding quantum size effect, the macroscopic quantum tunneling effect and the small size and many other factors affecting, which can induce the electromagnetic energy into heat energy by the electro magnetic radiation. The carbon nanocoils can be expected to become an efficient photo-thermal conversion nanocomponent due to its more outstanding mechanical and electromagnetic properties than carbon nanotubes. By adjusting the laser focus position on the carbon nanocoils, we can make the laser focus spot center is just situated on the carbon nanocoil, so that laser photon energy can be converted into heat efficiently by carbon nanocoil. The location between the two pitch sections of the carbon nanocoil is equivalent to the active sites of micro-bubble generation. Micro-bubbles can be created in the active sites focused by the laser beam. We study the expansion and the stabilization process of the micro-bubble by the classical heat and mass transfer theory. It proves that the carbon nanocoils are excellent heating elements to generate the micron bubble. At the same time, taking optical tweezers to induce heating elements is an simple and controlled method to prepare the micro-bubbles. Based on the above principles, we know that carbon nanocoil is not only a good heating elements to generate micron bubbles but also a temperature-driven carrier, which can drive the paraffin micro-particles to be transmitted on the carbon nanocoil. In our experiments, paraffin micro-particle is driven toward single direction or two-direction when laser focuses on the paraffin micro-particle or the place which paraffin micro-particle is in contact with carbon nanocoil.