Introduction

The latest evolution in the filtration industry is the use of nanotechnology in this field. With this technique, the surface of large cellulosic or synthetic fibers (usually 10 to 30 micrometers in diameter) is covered with a layer of ultra-fine nanofibers (typically 50 to 400 nanometers in diameter). In this method, before the pleating process, the filter paper is covered with a layer of polymeric nanofibers with diameter of 50 to 300 nanometer by using an electric field. Nanofibers form because of the existence of a large potential difference.