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Oral presentation

Preparation of fluoropolymer-based ion-track membranes; control of pore size and shape by track structures

Yamaki, Tetsuya; Nuryanthi, N.*; Koshikawa, Hiroshi; Sawada, Shinichi; Asano, Masaharu; Maekawa, Yasunari; Voss, K.-O.*; Christina, T.*

no journal, , 

Our focus has been placed on ion-track membranes of poly(vinylidene fluoride) (PVDF), a type of fluoropolymer. Here we investigated the track-structure-dependent pore formation by scanning electron microscopy and conductometry to control the pore size and shape by direct use of the irradiation effect. According to the study of the films irradiated with different ions, the diameter of the etched pores actually depended on the deposited energy within each track represented by the linear energy transfer (LET). The depth distribution of the LET was then applied to control the pore shape, in other words, to prepare nanopores with a conical as well as cylindrical shape.

Oral presentation

Ion-track membranes of fluoropolymers: Toward control of pore size and shape

Yamaki, Tetsuya; Nuryanthi, N.*; Koshikawa, Hiroshi; Asano, Masaharu; Sawada, Shinichi; Hakoda, Teruyuki; Maekawa, Yasunari; Voss, K.-O.*; Severin, D.*; Seidl, T.*; et al.

no journal, , 

The possibility of varying the beam parameters and applying the effect of a pre-etching treatment for poly(vinylidene fluoride) (PVDF) ion-track membranes was investigated with the goal of achieving enhanced track etching for effective control of the pore size and shape. Commercially available 25 $$mu$$m-thick PVDF films were irradiated at room temperature with swift heavy ions. Irradiation with a higher-LET beam gave faster track etching and larger pores, suggesting that the LET could be the most crucial factor determining the pore size. In-situ infra-red absorption and residual gas analyses shed light on the detailed chemistry of not only the ion-induced degradation, but also post-irradiation reactions. The pre-etching treatment effect involved oxidation of the unsaturated bonds within the latent track, which accelerated the chemical dissolution for efficient pore evolution. In other words, exposure to a gaseous oxidant, i.e., ozone, shortened the breakthrough time.

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