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Electrospinning nanofibers

Electrospinning nanofibers. Chitosan [poly(b-1/4)-2-amino-2-deoxy-D-glucopyranose] is a polycationic property that has a partial or total effect by incorporating chitin into the cell wall of oysters and some fungi will. Deacetylation in alkaline medium is a biopolymer. Many researchers have found that chitosan is often preferred in biomedical applications due to its biocompatibility, biodegradability, non-toxicity, potential for cell adhesion and proliferation, antimicrobial activity, and its aid in rapid wound healing. However, chitosan can be produced in the form of powder, gel, foam, film, fiber and thread and used in many different forms in many fields (Tikhonov et al., 2006; Peter, 1996; Rao and Sharma, 1994; Rinaudo, 2006) . It is one of the synthetic polymers with mechanical and physical properties, biocompatible and biodegradable.

Electrospinning nanofibers

It is generally obtained by ring-opening polymerization of “ε-caprolactam”. It has a very wide range of uses, especially in the textile industry. Electrospinning can be briefly defined as the production of submicron fineness fibers by the application of electrostatic forces to a polymer solution or melt. This method includes operational steps such as (i) charging the solution with electric charges (ii) Taylor coning (iii) diluting the polymer jet by instability (whiplash instability) in the electric field (iv) diluting, collecting and solidifying. The polymer jet is converted into fibers on the collection mechanism.

Diameter and morphology of fibers obtained by electrospinning processes, solution properties (viscosity, conductivity, molecular weight and polymer concentration, surface tension, type of solvent), process parameters (electric field strength, distance between feeder and collector, feed amount of solution) and environmental conditions (temperature, humidity) (Chong et al., 2007; Lee et al., 2004). It can be seen that the academic and industry interest in the electrospinning method has increased in recent years as it allows the use of simple and efficient nanofibers. Production of natural and synthetic polymers

Nanofiber-based structures are considered as potential materials, due to their high surface-to-volume ratio, high porosity, and very small pore size (Li and Xia, 2004) As the surface tension increases sharply, electrostatic attraction is said to cause various problems. To overcome this problem, smooth nanofibers can be obtained by blending various polymers.

The chitosan (CS) produced at 2% by weight was dissolved homogeneously in 90% strength acetic acid with stirring for 24 h at room temperature. For 7 hours, homogeneous solution, electrogravity tests were performed. The solutions were mixed using a magnetic stirrer (Stuart, SB 162) for two hours at room temperature. The pH of the prepared solutions was determined using indicator cards (indicator strips, Merck) and their viscosity values. Their conductivity was determined using a Brookfield viscometer (DV-E viscometer). It was measured with a WTW brand device (Cond 3110). A spindle of the type S21 with a rotation of 30 rpm was used for viscometer measurements.

The electrospinning process was performed using a laboratory machine (NanoFMG, NS24) designed on the principle of vertical work. Each solution was transferred to syringes with a volume of 10 ml and introduced into an aluminum foil-covered cylindrical manifold using a 20-gauge delivery unit (nozzle), and the amount of the feed solutions was measured in an electric field of 0.50 ml/hour definitely. And the distance was adjusted to 15 cm. A voltage of 34 kV was applied in electrogravity experiments. Alternating current (AC) was used to create the electric field. The experiments were carried out at a relative humidity of 35-42% and at variable temperatures between 26-31 degrees Celsius.

The polycationic nature of chitosan and the strong intramolecular and intermolecular interactions in its chemical structure create significant problems in the electrospinning process. Strong hydrogen bonds prevent the free movement of polymer chain blocks in the electric field and lead to nozzle cracking during the electrospinning process [Li and Hsieh, 2006; Desai and Keith, 2008). In addition, the repulsive forces between the ionic groups in the polymer chain sufficiently prevent entanglement (entanglement) of the polymer chains. This prevents the formation of sufficient and continuous fibers during stretching, bending and impact instability of the polymer jet. These problems result in the formation of globules or irregular beaded fibers during the elongation of the polymer stream rather than the formation of regular fibers as a result of the electrospinning process.

Electrospin Technology

Electrospin Technology.  The surfaces obtained through the production of nanofibers, whose diameters vary between 1.6 and 500 nm, are widely applicable thanks to the large specific surface area and the nanometric pores of the mesh.

ime technologies electrospinning

Micrometric cellulose nanofibers derived from wood pulp are used in papermaking. Technically, paper made with nanofibers has many advantages over paper made by mechanical grinding, such as: B. good mechanical properties and longer durability. In addition, it is possible to obtain paper that can be recycled many times like ordinary paper.

advances in electrospinning technology

Paper is a composite of cellulosic fibers that are micrometric in width. In recent years, researchers have become interested in making paper from nanometer-scale cellulosic fibers in addition to conventional fibers. The large surface area of ​​some nanofibers allows the nanofibers to bond with neighboring fibers. This makes the paper more durable.

aligned nanofibers based on electrospinning technology

The most important environmental aspects in the production of pulp and paper are emissions to air and energy consumption. It is estimated that garbage is becoming an increasing environmental problem by the day. Studies have been carried out to find solutions to these environmental problems, to avoid and reduce emissions/waste and to reduce energy and raw material consumption.

ball electrospinning technology

According to researchers, depending on how nanofibers are made, the environmental impact of paper can be reduced. Marc Delgado-Aguilar from the University of Girona in Spain and his colleagues wanted to analyze the environmental impact of nanofibers added to paper. To do this, they repeatedly recycled standard paper using traditional mechanical recycling techniques and adding 3% by weight of cellulose nanofibers to the pulp in each cycle.

biomimetic electrospinning technologies

They tested the mechanical strength of the paper after each cycle. While the traditional recycling method rendered the pages unusable for writing after 3 recycling operations, the nanofiber papers can be recycled 7 times.

cell electrospinning technology

The disadvantages of cellulose nanofibers are the use of strong acids and oxidizing agents in today’s pulp processing. This is followed by the mechanical breakdown of cellulose fibers into nanoscale sub-units. To eliminate the need for chemical treatment, the researchers used a purely mechanical process to separate the nanofibers that costs 1 percent of the traditional process.

electrospinning centre for nanoscience and technology

Researchers also performed a preliminary life cycle assessment of the environmental impacts of the two techniques, taking into account factors such as water and energy use, human health impacts and waste generation. Although these two recycling techniques have similar environmental impacts, the number of recycling cycles for paper containing nanofibers is higher.

electrospinning technology for applications in supercapacitors

However, according to Delgado-Aguilar, new advances in nanofiber manufacturing technology will soon be available, and nanofibers will be produced with better yields that can reduce energy consumption and increase the number of possible recycling cycles.

electrospinning technology for nanofiber production

nanofiber membranes; It is used in many areas such as filtration, tissue engineering, sensor manufacture, mask and protective clothing manufacture, drug delivery, catalyst carriers, wound closure, battery polymers and composite carriers.

electrospinning technology in tissue regeneration

Among the areas of use of nanofibers we can mention things like filtration applications, battery separators, wound dressings, external coatings and respiratory membrane coating applications.

needleless electrospinning of nanofibers technology and applications

Electrospinning is a simple and inexpensive technique to obtain nanofibers/nanowebs.

needleless electrospinning of nanofibers technology and applications2013

The electrospinning machine is a machine for producing nanofiber arrays from polymer solutions in a high electric field created at high voltage by electrofabrication processes. The required high voltage is supplied from a high voltage power source to a suitable polymer solution in the range of 10-40 kV.

polymer electrospinning technology & applications

Electrospinning systems (electrospinning) are systems that allow the production of nanofiber materials (nanofibers) from polymer solutions in a high electric field generated by a high voltage power source.

portable electrospinning technology

Electrospinning technology, introduced as a technology of the future, is based on applying a controlled electrical field strength to a liquid solution. Thread-like fiber structures produced with this technique from the technical and medical field have found their way into many areas of our lives in a short time.

portable electrospinning technology wounds

According to the historical development, nanofibrous membranes are produced by stretching methods, template synthesis, phase separation methods, self-assembly and electrospray methods. Long and simple nanofibers can be obtained by stretching methods.

Sonic electrospinning technology

These properties allow electrospun materials to be used in stents used in vascular occlusions, optical applications, bone regeneration, artificial kidney development, and wound-filling materials.

what’s electrospinning technology

With this technique, fibers with diameters in the nanometer range (10 nm to 500 nm) can be obtained (Figure 1). …these nanofibers/nanowires have a very large surface area and nano-sized holes.