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Report No.
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Preparation of porous fluoropolymer membranes by ion beam irradiation; Size and shape control of "track-etched pores"

Yamaki, Tetsuya; Nuryanthi, N.; Koshikawa, Hiroshi; Sawada, Shinichi; Hasegawa, Shin; Asano, Masaharu; Maekawa, Yasunari; Voss, K.-O.*; Trautmann, C.*; Neumann, R.*

Although the ion-track technique has mainly been studied on a series of hydrocarbon polymers such as polycarbonate and polyethylene terephthalate, our focus has been placed on ion track membranes of poly(vinylidene fluoride) (PVDF), a type of fluoropolymers, because of superior chemical, mechanical and ferro-electric properties. In this study, PVDF membranes with conical and cylindrical nanopores were prepared in a controlled manner by the ion-track technique, which involved ion-beam irradiation and the subsequent alkaline etching. Etching behavior mainly depended on energy deposition of ion beams, and thus its depth distribution, estimated by theoretical simulation, was successfully applied to control the shapes and diameters of the etched pores.

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