Ion Track Technology

PhysicsConsult

Reimar Spohr

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Reversible on-off switch function of ion-track pores for thermo-responsive films based on copolymers consisting of diethyleneglycol-bis-allylcarbonate and acryloyl-L-proline methyl ester. Masaru Yoshida, Noriyasu Nagaoka, Masaharu Asano, Hideki Omichi, Hitoshi Kubota, Koichi Ogura, Johann Vetter, Reimar Spohr, Ryoichi Katakai. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume 122, Issue 1, 1 January 1997, Pages 39-44.

Intelligent chemical valves responding to a slight change of temperature were created by the combination of ion beam-chemical etching technique and a novel material consisting of an ion track detector material diethyleneglycol-bis-allylcarbonate (CR-39) and a thermo-responsive gel acryloyl-L-proline methyl ester (A-ProOMe). The changes in size of ion-track pores in etched films were measured microscopically by repetition between 0 and 30°C at 24-h intervals for a 50 μm thick copoly(CR-39/A-ProOMe, 60/40mol %) film which was obtained by etching in aqueous 6M NaOH solution at 60°C after an 11.6 MeV/n 208Pb ion irradiation and, as a result, it was found that the pore size in the film obtained by etching for 10 min is reversibly changed from a perfectly closed pore at 0°C to a fully opened pore with a diameter of 0.30 μm at 30°C.