This electrospinning device uses a nozzle-less system (capillary free) which is a modified electrospinning method.. This modified process for the production of nanofibers is known as the Nanospider, in which there is no need to use syringes, capillaries or needles, in which only the polymer solution is placed in an electric field using a rotating cylinder electrode to produce a jet they give. The advantages of this method include high production of nanofibers and easy maintenance of equipment.

 

Nanofibers are geometrically in the category of one-dimensional nanoscales. The flexibility of nanofibers places them among other nanoparticles that are flexible, such as spherical molecules (which are dimensionless materials) as well as solid and liquid films with nano-thickness (two-dimensional). In general, nanofibers are flexible linear solids with a length to diameter ratio greater than 1 to 1000. It offers interesting properties when the diameter of polymer fibers decreases from the micrometer scale to below the micron or nanometer scale. The most important properties of nanofibers are high surface to volume ratio, very high flexibility and mechanical performance (eg hardness and tensile strength). These outstanding properties have made nanofibers a viable option for many important applications in advanced technologies.

The electrospinning process is one of the simplest and most diverse methods of producing a variety of nanofiber structures such as hollow, core-shell and porous nanofibers with uniform diameters. This method is similar to the commercial production of microfibers by mechanical spinning, except that it creates an electrostatic repulsion between surface loads (instead of shear or mechanical force) to continuously reduce the diameter of the viscoelastic jet. Compared to mechanical spinning, electrostatic or electrospinning spinning has the ability to produce smaller diameter fibers. The electrospinning process is very similar to the electrostatic or electrospray spraying process. In both methods, high voltage is used to form the liquid jet. In the electrospray process, very small particles are sprayed onto the surface of the substrate during a continuous flow break from the soluble jet (often at low viscosity). In the electrospinning process, as a solution, solid fibers are produced by evaporating the solvent in a continuous jet from the solution. This jet is continuously formed due to the presence of electrostatic forces due to surface electric charges

This electrospinning device uses a nozzle-less system (capillary free) which is a modified electrospinning method. In this method, the high voltage power supply is connected to the metal roller inside the solution bath and the roller rotates the solution upwards and due to the potential difference between the collector at the top and the rollers, the jets are formed and towards They collect and form nanofibers on its surface. This modified process for the production of nanofibers is known as the Nanospider, in which there is no need to use syringes, capillaries or needles, in which only the polymer solution is placed in an electric field using a rotating cylinder electrode to produce a jet they give. The advantages of this method include high production of nanofibers and easy maintenance of equipment

Electrospinning is the process of applying an electric charge to a soluble or molten polymer jet to produce fibers and apply tension to the fibers. During this process, a high voltage in the range of kV is applied to the polymer fluid, so that electric charges are induced into the fluid. When the in-fluid loads reach a critical level, a jet of fluid will form in the form of a Taylor cone. The electrospinning jet will move towards the collector. The electrically charged jet undergoes bending instabilities along its path and forms polymer fiber rings several times, which reduces the diameter of the fibers. On the other hand, the solvent gradually evaporates and the charged polymer fibers on the collector. It is collected in the form of a layer.
On laboratory scales, most electrospinning processes are performed using a nozzle. However, the low fluid output in this method limits its use on an industrial scale because the amount and speed of production of nanofibers is less than the amount required for commercial applications. Therefore, various proposals have been made to improve electrospinning efficiency based on different principles, the most important of which is nozzle-less electrospinning methods.
The technology presented by Arman Research and Technology Group is designed and implemented to set up a production line for the industrial production of polymer nanofibers by the electrospinning method without nozzles

The main effective parameters in this process are the concentration of the polymer solution, the applied voltage, the distance between the pin drum to the collector and the rotation speed of the drum, which can be controlled in this device to control the diameter and morphology of the produced nanofibers.

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