Little spinner

Nano flowers and electric spinning: electron microscopic art and their technical application

Science can be so when researchers have nano flowers. At the same time, it is intensively worked on, always finer nanofibers to spin, as reported in the current edition of the Science Journal of Science.

Of course, Ghim Wei Ho and his colleague was not about to create a garden for the dwarfs (Nano means in Greek dwarf). They experiment with the development of new materials. For their experiment, they dripped the liquid metal gallium, which serves in connections for the production of light-emitting diodes and transistors, on a silicon surface. The whole was steamed with a methane-containing gas and then condensed in the form of nanowired silicon carbide with a diameter of less than a thousandth of a human hair.

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The method is called chemical deposition from the gas phase (Chemical Vapor Deposition). By changing the prere and the temperature, the growth process of the fine wire can be influenced and there are various new structures, for example the shapes firmly held with a scanning electron microscope, which see tree and bleeding similarly. The pictures with which the student Ghim Wei Ho already won an internal photo competition in Cambridge (Photo Competition at the Department of Engineering), will be published in the August edition of the Journal Nanotechnology of the Institute of Physics and are already available in a pre-online version (Three-Dimensional Crystalline Sic Nanowire Flowers).

But the newly created forms are not only, but also mountains practical applications for nanomaterials. Wei Hos Professor, Mark Welland, explains:

"The unique structures shown in these images have a full range of exciting use potentials. Two are being examined for their skills as a water-absorbing coating and as a basis for a new type of solar cell."

Electrospegers of nanofasern

In Science, Yuris dzenis from the University of Nebraska-Lincoln in Lincoln gives a research overview of the spinning of nanofasern (nanofasern in front of the camera). In addition to nano ears (the exotic beat of the nanor ears) they are considered particularly promising when it comes to the art production of intelligent materials. From electronics on filter systems to medicine, the new materials should work wonders. Shoes with nanosols could in the future Spiderman’s facade climbing for all measure (nano contacts optimize adhesion). Human tie should be rebuilt with tiny bays, healed bone breaks (Nano-Biotechnology: Carbon Nanofibres as improved neural and orthopaedic implant) or the growth of nerve cells are encouraged (Scientists Grow Neuron Using Nanostructures). The militar regularly introduces lightweight, firing west and integrated sensors equipped biological high-tech protective sanction (nanotechnology for militar).

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So far, nanofibers are usually made with synthetic bottom-up methods, D.H. built up by manipulation of individual atoms or molecules. The controlled manipulation and thus the control of the resulting fibers is difficult in this approach, and thus their integration into applications. In order to produce desired shapes and structures of nanofibers, the electric spinning offers. The procedure allows the production of continuous polymer nanofibers in a strong electric field (electric spinning of nanofasers). The first patent was granted in 1934, yet the electric spinning remained largely unnoticed until the mid-90s. In the meantime, researchers are intensively dealing with this process worldwide, in 2003 alone, about 200 articles were published in trade journals. More than a hundred synthetic and natural polymers were spun in laboratories to nanofibers with diameters of few nanometers (1 billionth meters) up to micrometers (1 millionths of meters).

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A: Comparison of commercial carbon fibers Best quality and electro-spurred nanofiber B and C: Comparison of steam-drawn commercial carbon fiber (B) and electro-spurred carbon fiber: The nanofiber is clearly equal and pure D and E: examples of highly balanced and aligned linear and orthogenal compilations of nanofasern Q: Cross section of a nanocrystalline zirconium fiber for potential applications in superfest ceramic.

The process is much cost-effective than most bottom-up methods. The resulting fibers are usually very agile and uninterrupted. Therefore, there are less health concerns against these continuous bats than against other nanoparticles (heavy discussion about nanotechnology). You can also be simpler with other components for applications.

In the youngest time, gross progress has been made in the control of the process, which are mainly interesting for the artificial production of tie, the Tie Engineering. In addition, the research of Sudkorean (Electrospinning of Silk Fibroin Nanofiber’s and Its Effect on the Adhesion and Spreading of Normal Human Keratinocytes and Fibroblasts in Vitro) and German Scientists (electro-spurred nanofibers on poly (L) -Lactide base as matrix for Tie Engineering).

Electric spun nanofibers with human hair

However, some important questions are still open, especially the reduction of the diameter still makes problems. The production of nanofibers with diameters of three to five nanometers through electric spinners has already succeeded, but with many materials, it is difficult to fall below the limit of 50 nanometers for stable fibers.

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