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Rotating drum collector

Rotating drum collector. The first commercial steps in nanotechnology were taken in the textile field. At the molecular level, it is currently possible to improve textiles, provide innovations, increase resistance and functional properties. More work in the field of nanotechnology will add value to the product and bring more income to the textile industry.

Electrospinning rotating drum collector

The table below summarizes the typical processes that have been developed for the fabrication of polymer-based nanofibers. Although the term nano has attracted much attention in fiber studies, the commercial potential of nanofibers is still unclear. Much discussed potential markets are filtration, protective clothing and polishing cloths. With the expansion and improvement of nanofiber production techniques, the production cost will decrease, and the development of related markets will become very interesting.

Rotating drum collector

In order to provide the desired properties such as diameter, morphology, position, distribution of the fibers produced in the electrospinning process, only the process parameters should be well known. However, process control is difficult because many parameters affect the process. The parameters affecting the electrospinning process can be considered in three main sections (Table 3.7). These are solution parameters, process parameters and environmental parameters.

Rotating drum collector electrospinning

The properties of the polymer solution are the most important parameters affecting the electrospinning process and the properties of the fibers formed. The parameters of the solution are the molecular weight of the polymer, the surface tension, the electrical conductivity and the dielectric properties of the polymer solution.

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One of the factors affecting solution viscosity is the molecular weight of the polymer. In general, when samples of different molecular weights of the same polymer are dissolved, the solution obtained from the high molecular weight polymer has a higher viscosity than the low molecular weight solution. In other words, as the molecular weight of the polymer increases, the viscosity of the solution also increases.

Rotating drum collector nanofiber

Similar to the increase in molecular weight, the increase in concentration also increases the complexity of the polymer chain and thus the beam in the electrospinning process.

Spraybase rotating drum collector

To ensure its continuity. With increasing concentration, the formation of spheres in the obtained nanofibers decreases, while the shape of the spheres changes from spherical to flat (Figure 3.20) (Kozanoğlu, 2006). However, minimum polymer chain complexity and therefore minimum viscosity is required for electrospinning. Too high a viscosity makes it difficult to pump the solution through the nozzle. Also, too high a viscosity can cause the solution to dry at the tip of the nozzle before electrospinning begins.

At low viscosity, chain complexity is low and the effect of surface tension forces on the nozzle during electrospinning is dominant. Balling can therefore be observed due to the lack of a continuous jet. An increase in viscosity increases the complexity of the polymer chain and ensures continuous jet formation in the electrospinning process (Üstündağ and Karaca, 2009). With increasing viscosity, the fiber diameter also increases. This is likely due to the solution’s increased resistance to the drag caused by the jet loads.

In order to initiate electrospinning, the electrically charged solution must overcome surface tension. Surface tension has the effect of reducing the surface area per unit mass of liquid. When the concentration of free solvent molecules is high due to surface tension, the tendency of the solvent molecules to aggregate and become spherical increases. In this case, as the polymer jet moves toward the collector plate, surface tension can cause beads to form along the jet.

High viscosity means more interaction between the solvent molecules and the polymer. So when the solution is stretched under the influence of stresses, the solvent molecules tend to diffuse into the complex polymer molecules, so the solvent molecules tend to stick together under the influence is reduced surface tension

 

Electrospinning collector

Electrospinning collector. The electrospinning process is known as a multidisciplinary process that includes areas such as fluid dynamics, polymer chemistry, physics, electrophysics, mechanical engineering and textile engineering.

electrospinning drum collector

It basically consists of three main parts. High-voltage power supply, power supply (syringe, metal needle, etc.), collector plate (circuit board, rotating cylinder, etc.). With the electrospinning process it is possible to obtain surfaces derived from polymers made of nanofibers with diameters ranging from a few microns to less than 100 nm.

electrospinning rotating drum collector

Our electrospinning machine is designed for R&D and laboratory study and multi-needle nanofiber production. It is designed for the development of nanofiber-based products in many industrial sectors such as textile and air filter, chemical, defense, construction, medical, pharmaceutical and agricultural industries.

rotating drum collector electrospinning

In addition, organizations researching nanofibers and electrospinning can work more easily with the electrospinning machine we use.

cells death collector electrospin electricuted

Spengenix Electrospinning is designed to simplify production with its user-friendly technology. With needs-based design, it fills in the missing points in the processes and, with the plasma technology integrated into the system, enables more hydrophilic surfaces to be achieved by increasing surface energy and forming a surface more effectively. Scattered or aligned fibrous structure

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Polymer solution, process parameters and environmental parameters influence the manufacturing process of nanofibers by electrospinning processes. These parameters can be grouped under three main headings.

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The molecular weight of the polymer is an effective parameter for the structure of the fibers produced.

collector choice for electrospinning

The concentration of the polymer solution is an important parameter affecting the fabrication process of nanofibers by electrospinning. With increasing concentration of the polymer solution used, polymer particles in micro and nano sizes are formed.

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If it is increased further, vortex structures are observed. When the concentration is reduced, electrospray occurs instead of electrospinning.

collector used in electrospinning to do carbonization

When the right concentration is provided and other parameters are increased, the production of ideal nanofibers is achieved.

collectors of electrospinning

In general, molecular weight indicates the viscosity of polymer chains in solutions. By increasing the molecular weight, smooth fiber and microstrip are obtained.

electrospinning collector design

The viscosity of the polymer solution plays an important role in determining fiber morphology. It has been proven that continuous and smooth fibers cannot be obtained with very low viscosity (Ismail et al., 2019).

electrospinning collector distance

The viscosity of the polymer solution used can be changed by adjusting the concentration of the polymer in the solution. The viscosity range of different polymer or oligomer solutions used in the electrospinning process is different.

electrospinning collector material

The surface tension is a dominant factor for the low viscosity of the solution used. Only fibers with a pearl structure are formed. When using a solution of suitable viscosity, continuous fibers are formed.

electrospinning collectors

The surface tension of the fiber solution produced in the electrospinning process also plays a very important role. Different solvents can contribute to different surface tensions. At a fixed concentration, the surface tension of the solution decreases and the beaded fibers formed can be replaced by smooth fibers.

Electrospinning gel collector

The conductivity of the solution used in the preparation is determined depending on the type of polymer and the type of solvent. In general, natural polymers are known to increase the chargeability of the polymer beam with more ions under higher voltage under electric field and produce weak fibers.

electrospinning liquid collector

The adjustment can be made by adding ionic salts such as KH2PO4, NaCl, etc. to impart electrical conductivity to the electrospinning solution (Matabola and Moutloali, 2013).

electrospinning rotating collector

The voltage applied in the system plays a very important role in the electrospinning process. By applying a high voltage, the polymer solution is electrically charged with a specific electrical conductivity.

electrospinning système collector

As the applied voltage increases, the diameter of the fiber produced decreases due to the increase in electrostatic repulsive forces on the die. This reduces the pearl structure. However, at very high voltages, increased jet instability can be observed as the Taylor cone collapses into the nozzle.

how does rotating collector affect fiber diameter electrospinning

As a result, increased bead formation can be observed. As the voltage increases to a certain level, beading decreases while the bead shape changes from spherical to spindle-shaped.

melt electrospinning collector distance

However, as the voltage is further increased, the spheres again approach the spherical shape. That is, the applied voltage must have an upper limit.

novel method of electrospinning rotating dual electrode collector design

The high voltage applied by the power supply to the main components in the electrospinning process can result in increased beading after the Taylor cone is pushed back into the nozzle.

rotating collector electrospinning

Increasing the tension up to a certain level will produce smooth fibers, while increasing it further can result in structural degradation.

rotating continual collector electrospinning

In addition, the surface tension and the viscosity of the solution can be adjusted by changing the solvent mixture and the mass ratio.

 

using textiles as an electrospinning collector

Sometimes it is possible to obtain a high conductivity of the solution by using an organic acid as a solvent.

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Solution Flow Rate: The flow rate of the polymer solution in the syringe to the manifold is another important process parameter. In general, a lower flow rate is recommended because the polymer solution takes time to polarize. If the flow rate is too high, large diameter fibers will ball up.