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Filtration

Electrospinning has been used for several years now in the manufacture of filtration products, filter media, and the selective separation of substances. The possibility of processing a wide variety of interesting materials for filtration and separation, such as polyamides, PAN, PA6, PET, PU, PVDF or PLA, among other polymers – some of which are reusable materials and others are biodegradable – and being able to fine-tune the fibre size of the fibrous mesh, the degree of porosity, and the pore size make electrospinning an ideal technology for developing this type of applications.

There is a clear correlation between the morphology of the nonwoven generated through electrospinning (electrospun membrane) and its homogeneity, and such important properties of a filter media as filtration efficiency and resistance to air or liquid (generated load losses).

Smaller fibres (e.g. around 100nm or even less in some cases) can be obtained using electrospinning rather than meltblown. This is critical in certain filtration applications.

With electrospinning in a single step, additives can be added to the nonwoven in order to functionalise it: for example, with antifungal, antibacterial and other agents.

The electrospinning technique can even be used to process ceramic or metal materials using also a sacrificial polymer that is correctly processed by electrospinning and that, in a post-process, can be eliminated so that only a nonwoven of ceramic fibers or metal substances remains, thus generating a filter with special properties and characteristics for certain filtration applications.

Electrospinning nanofiber filters bring significant benefits to filtration applications due to their high surface area, porosity, and customizable properties. The process allows for the creation of intricate structures with precise control over fiber diameter, leading to filters that effectively capture tiny particles or for selective separation or purification ob substances.

These electrospinning nanofiber filters are beneficial in various areas, including air purification, water treatment, protective clothing and purification of biological systems. Furthermore, the flexibility of the electrospinning process enables the addition of functional materials to the fibers, enhancing the performance of the electrospinning nanofiber filters. Therefore, the use of electrospun fibers in filtration applications electrospinning stands as a robust, versatile technique for developing efficient filtration systems.