Summary. Electrospinning of nanofibers has emerged as a specialized processing technique for the formation of sub-micron fibers, with high specific surface. Dr. A. K. Haghi holds a BSc in urban and environmental engineering from the University of North Carolina (USA); an MSc in mechanical engineering from North.
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Nanotechnology is revolutionising the world of materials Learn about a new generation of textile fibers that have a wide range of applications Examines how to improve polymer properties. The Electrospinning Process Electrospinning is not by any means a new discovery. Its roots go back to the early s, when the first patent was issued.
mail.wegoup777.online/qu-es-la-tica-aplicada.php Simply stated, electrospinning is a process that uses the electrostatic attraction between a charged polymer and a grounded or oppositely charged collection plate to produce extremely fine fibers ranging in diameter from less than 10 nanometers nm to several micrometers. Recent developments have shown it can be performed on polymers both in the molten state and in solution. The polymer is held in a syringe or other type of container See Figure 1.
The charge can be applied directly to the syringe so that when polymer passes through, it receives a surface charge similar to that applied to the syringe. As the voltage to the system is increased, the strength of the electric field generated eventually becomes greater than the viscoelastic properties and surface tension of the polymer, and a tiny cone — often referred to as a Taylor Cone — is formed. When working with solutions, this strand will continue as a stable jet for a short period of time before the instability or whipping region occurs. It is important to note that due to a much higher viscosity and lack of solvent evaporation, fibers electrospun from the melt do not undergo an instability region and as a result have much larger diameters.
Electrospun fibers typically have been collected as a random nonwoven mat, and most of the applications developed today reflect this configuration See Figure 2. However, advancements in collection techniques continue to be a major focus of research. As a result, it is possible to collect aligned continuous fibers that can be twisted to form yarns composed of nanofibers.
Nanofiber Applications It is one thing to successfully produce nanofibers, but it is more important from an economic standpoint to find a suitable application for them. One of the main goals for nanofibers has been to produce the strength they should theoretically possess. Another potential benefit of nanofiber technology is the tremendous increase in surface-area-to-weight or -volume ratios. The lure of nanotechnology stems from the possibility of redefining these limitations. If a 5-nm-diameter fiber is produced, the molecular chains are effectively forced to align in a highly crystalline manner.