Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1994
ABSTRACT Solvent induced sensitization of heavy ion tracks in 19 mum polyethylene terephthalate f... more ABSTRACT Solvent induced sensitization of heavy ion tracks in 19 mum polyethylene terephthalate foils (Hostaphan RN19) is studied using dimethyl formamide (DMF) as swelling agent (thickness increase 5-7%) and argon gas as permeant. Due to the latent ion tracks acting as irrigation pipes the irradiated material swells one to two orders of magnitude faster than the original material. The effect of diffusion enhancement decreases with increasing linear energy transfer (LET) of the ions from about 8 for 15 MeV/u Ar to about 2-4 for 11.4 MeV/u Pb. The study of diffusive transfer of molecules along latent tracks enables an insight into sorption phenomena. It yields details concerning swelling, swelling equilibrium, and diffusion processes preceding track etching.
A comparative study of latent and etched track parameters in various polymers is performed with t... more A comparative study of latent and etched track parameters in various polymers is performed with the emphasis on the tracks of very heavy particles such as 238U ions in the energy range of 1–11.6 MeV/u. Samples of polyethylene terephthalate (PET), polypropylene (PP) and polysulphone (PSU) films were irradiated with heavy ions of various masses. The etching kinetics of the tracks
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2010
ABSTRACT We describe a system for fabricating prescribed numbers of ion track nanochannels and na... more ABSTRACT We describe a system for fabricating prescribed numbers of ion track nanochannels and nanowires from a few hundred down to one. It consists of two parts: first, a mobile tape transport system, which, in connection with an ion beam from a heavy-ion accelerator (nuclear charge Z above 18 and specific energy between 1 and 10 MeV/nucleon) tuned down to low flux density by means of defocusing and a set of sensitive fluorescence screens, can fabricate a series of equidistant irradiation spots on a tape, whereby each spot corresponds to a preset number of ion tracks. The tape transport system uses films of 36 mm width and thicknesses between 5 and 100 μm. The aiming precision of the system depends on the diameter of the installed beam-defining aperture, which is between 50 and 500 μm. The distance between neighboring irradiation spots on the tape is variable and typically set to 25 mm. After reaching the preset number of ion counts the irradiation is terminated, the tape is marked and moved to the next position. The irradiated frames are punched out to circular membranes with the irradiation spot in the center. The second part of the setup is a compact conductometric system with 10 picoampere resolution consisting of a computer controlled conductometric cell, sealing the membrane hermetically between two chemically inert half-chambers containing electrodes and filling/flushing openings, and is encased by an electrical shield and a thermal insulation. The ion tracks can be etched to a preset diameter and the system can be programmed to electroreplicate nanochannels in a prescribed sequence of magnetic/nonmagnetic metals, alloys or semiconductors. The goal of our article is to make the scientific community aware of the special features of single-ion fabrication and to demonstrate convincingly the significance of controlled etching and electro-replication.
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1994
ABSTRACT Solvent induced sensitization of heavy ion tracks in 19 mum polyethylene terephthalate f... more ABSTRACT Solvent induced sensitization of heavy ion tracks in 19 mum polyethylene terephthalate foils (Hostaphan RN19) is studied using dimethyl formamide (DMF) as swelling agent (thickness increase 5-7%) and argon gas as permeant. Due to the latent ion tracks acting as irrigation pipes the irradiated material swells one to two orders of magnitude faster than the original material. The effect of diffusion enhancement decreases with increasing linear energy transfer (LET) of the ions from about 8 for 15 MeV/u Ar to about 2-4 for 11.4 MeV/u Pb. The study of diffusive transfer of molecules along latent tracks enables an insight into sorption phenomena. It yields details concerning swelling, swelling equilibrium, and diffusion processes preceding track etching.
A comparative study of latent and etched track parameters in various polymers is performed with t... more A comparative study of latent and etched track parameters in various polymers is performed with the emphasis on the tracks of very heavy particles such as 238U ions in the energy range of 1–11.6 MeV/u. Samples of polyethylene terephthalate (PET), polypropylene (PP) and polysulphone (PSU) films were irradiated with heavy ions of various masses. The etching kinetics of the tracks
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2010
ABSTRACT We describe a system for fabricating prescribed numbers of ion track nanochannels and na... more ABSTRACT We describe a system for fabricating prescribed numbers of ion track nanochannels and nanowires from a few hundred down to one. It consists of two parts: first, a mobile tape transport system, which, in connection with an ion beam from a heavy-ion accelerator (nuclear charge Z above 18 and specific energy between 1 and 10 MeV/nucleon) tuned down to low flux density by means of defocusing and a set of sensitive fluorescence screens, can fabricate a series of equidistant irradiation spots on a tape, whereby each spot corresponds to a preset number of ion tracks. The tape transport system uses films of 36 mm width and thicknesses between 5 and 100 μm. The aiming precision of the system depends on the diameter of the installed beam-defining aperture, which is between 50 and 500 μm. The distance between neighboring irradiation spots on the tape is variable and typically set to 25 mm. After reaching the preset number of ion counts the irradiation is terminated, the tape is marked and moved to the next position. The irradiated frames are punched out to circular membranes with the irradiation spot in the center. The second part of the setup is a compact conductometric system with 10 picoampere resolution consisting of a computer controlled conductometric cell, sealing the membrane hermetically between two chemically inert half-chambers containing electrodes and filling/flushing openings, and is encased by an electrical shield and a thermal insulation. The ion tracks can be etched to a preset diameter and the system can be programmed to electroreplicate nanochannels in a prescribed sequence of magnetic/nonmagnetic metals, alloys or semiconductors. The goal of our article is to make the scientific community aware of the special features of single-ion fabrication and to demonstrate convincingly the significance of controlled etching and electro-replication.
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