User talk:Yuanfeng

The Application
Because of its size and driven energy, the nanoscale plasmonic motor could provide rotational force at nanoscale, which would be widely used in energy conversion, biology and chemistry.The new developed light-driven nanoscale motor could address the limitations of earlier light mills. It generates comparable torque, which was made of gold and had much smaller size. At 100 nanometers across (one-tenth the size of other motors) it would make possible application like unwinding DNA in living cells and nanoelectromechanical systems(NEMS). .

When controlled winding and unwinding of DNA, the small motor could be illuminated at different wavelengths for in vivo manipulation. These motors could apply to solar light harvesting in nanoscopic systems through designing multiple motors to work at different resonance frequencies and single directions. Such multiple motor structures could be used to acquire torque from a broad wavelength range instead of a single frequency.

In biotechnology
The structural dynamics of cellular processes such as replication and transcription could determine the elastic properties of DNA. However, the effect of torque should be considered when measure DNA mechanics, a quantity that has not been directly measured in micromanipulation experiments. Under low tension, DNA behaves like an isotropic flexible rods; At higher tensions, the behaviour of over- and underwound molecules differ.When the nanoscale plasmonic motor is used, torsional stress will bult up in the molecule by holding the rotor bead stationary using fluid flow. Through obsever the twist angle of DNA, the elastic properties of DNA could be got. </

In microelectromechanical systems
The microelectromechanical system is different from the traditional electromechanical systme. Due to the wide variety of nonelectrical.For the nanosize plasma motor, it could harvest light energy through rotating microscopic-scale objects. In addition, sometimes it is advantageous to link transduction mechanisms in series (e.g., convert a thermal signal first into a mechanical signal, then into an optical signal, and finally into an electrical signal).

The limitation
The interaction increases between light and matter by the electrons oscillate collectively at the surface of metals, which is called "surface plasmons". An effect, which light fields are enhanced when they are resonant with these plasmons, has already been successfully used in techniques like single-molecule detection and surface-plasmon enhanced Raman spectroscopy (SERS). In the past, nanoparticles are rotated by exploiting the incident intrinsic movement of the light, but it is the first time that induce the rotation of a nanoparticle without exploiting the intrinsic angular momentum of light. Because the nanoscale plasmonic motor is a new techonology, the workhorse methods and materials of nanometre-scale electromechanical system (NEMS) technology are not universally well suited to the nanoscale. And they have limitations in strength and flexibility. In addition, during the research process, the nanoscale plasmonic moter face several problems, such as the price of higher development costs, greater complexity and a longer development time.

The future
In the future, scientist will pay more attention to improve the efficiency of the light mills and find a easier way to product the motor. The materials for motor also will be developed to instead the expensive materials,such as gold. Yuanfeng (talk) 17:07, 5 October 2011 (UTC)

images
Hi Yuanfeng, I want to make sure that your images have in fact been released to the public doman. Are you the author of these images? The images from the paper cannot be directly taken from the article because the journal owns that image. If you are reusing the image, you need to make sure that Nature Technology did release the image to the public domain. please insert the link where this is stated. MichChemGSI (talk) 20:50, 15 December 2011 (UTC)