Bulky Nanofibres

These nanowebs show good aerosol particle obstruction and comparatively low air resistance. Recently, the filtration properties of electrospun mats have been studied. To provide appropriate mechanical properties, nanofibre webs have been applied onto various substrates. Substrates which are often chosen to resemble conventional filter materials. 

Researchers have reported some properties of electrospun mats. They compared the performances of electrospun fibre mats with the properties of textiles and membranes currently used in protective clothing systems and showed that electrospun layers are extremely efficient for trapping airborne particles. Meanwhile, the air flow resistance and aerosol filtration properties are affected by the coating weight. It was shown that an extremely thin layer of electrospun nanofibres completely prevented particle penetration through the layer. 

The transport properties of electrospun nylon 6 mats have also been investigated by scientists. It has been found that the concentration of the polymer solution affected the fibre diameter, pore size, Brunauer-Emmett-Teller surface area and gas transport properties of the mats. It was shown that the filtration efficiency of nylon 6 nanofilters is superior to that of a commericial high efficiency particulate air filter for 0.3 micrometre test particles. Researchers found that the pore size and pore size distribution of electrospun polylacticacid (PLA) membranes are strongly associated with fibre mass, fibre diameter and fibre length. 

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A polymer solution with a concentration of 15 wt% was prepared by dissolving polyacrylonitrile (PAN) in DME PAN solution in DMF was loaded into a 1 ml syringe. A modified electrospinning system consisting of two syringe pumps was used to produce bulky nanofibre mats. The experimental setup of this electrospiiming procedure is shown in Figure 2.4. 

A comparison of nanofibre mats with different porosities shows that the nanofibre mat with higher porosity and air permeability has the higher moisture transfer. This result indicates that the high high air permeability resistance of nanofibre mats does not impede the moisture transfer through the bulky nanofibre mats. This difference... 

Bulky nanofibre mats with high rates of water vaponr diffusion and low air permeability are promising candidates for protective clothing applications. 

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