Size characterization of ion tracks in PET and PTFE using SAXS

Schauries, Daniel; Rodríguez, Matías; Afra, Boshra; Bierschenk, Thomas; Trautmann, C.; Mudie, Stephen; Kluth, Patrick

doi:10.1016/j.nimb.2015.08.071

Cited by 23 publications

(14 citation statements)

References 19 publications

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“…Comparing the scattering intensities extracted from the streaks reveals a clear change in the density of the tracks upon UV exposure and an increase in the track diameter. For latent tracks without UV radiation treatment, consistent with previous reports, a hard‐cylinder model fits well to the SAXS intensities, indicating the latent track structure can be described as a uniform damaged zone of decreased mass density with a radius of 4.5 ± 0.1 nm. For the UV‐exposed latent tracks, a core–shell model is required to fit the SAXS intensities consistent with a core of radius 0.5 ± 0.2 nm and a shell of radius 7.7 ± 0.3 nm.…”

Section: Resultssupporting

confidence: 88%

Highly Selective Ionic Transport through Subnanometer Pores in Polymer Films

Yan

Liu

et al. 2016

Adv Funct Materials

195

189

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Novel transport phenomena through nanopores are expected to emerge as their diameters approach subnanometer scales. However, it has been challenging to explore such a regime experimentally. Here, this study reports on polymer subnanometer pores exhibiting unique selective ionic transport. 12 μm long, parallel oriented polymer nanopores are fabricated in polyethylene terephthalate (PET) films by irradiation with GeV heavy ions and subsequent 3 h exposure to UV radiation. These nanopores show ionic transport selectivity spanning more than 6 orders of magnitude: the order of the transport rate is Li+>Na+>K+>Cs+>>Mg2+>Ca2+>Ba2+, and heavy metal ions such as Cd2+ and anions are blocked. The transport can be switched off with a sharp transition by decreasing the pH value of the electrolyte. Structural measurements and molecular dynamics simulations suggest that the ionic transport is attributed to negatively charged nanopores with pore radii of ≈0.3 nm, and the selectivity is associated with the dehydration effect.

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Section: Resultssupporting

confidence: 88%

Highly Selective Ionic Transport through Subnanometer Pores in Polymer Films

Yan

Liu

et al. 2016

Adv Funct Materials

195

189

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show abstract

“…As a result of these processes, covalent bonds between the atoms of the polymeric network are cut, leading to severe radiation damage. Small volatile degradation products including hydrogen, hydrocarbons and carbon oxides, migrate out of the foil into vacuum, leaving back a cylindrical so-called latent ion track, a zone with reduced density and modified chemical reactivity [7,8].…”

Section: Ion Irradiation: Formation Of An Ion Damage Trackmentioning

confidence: 99%

The iNAPO Project: Biomimetic Nanopores for a New Generation of Lab-on-Chip Micro Sensors

Ensinger¹,

Ali²,

Nasir³

et al. 2018

IJTAN

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In nature, ion conducting nanopores play a vital role for the function of living cells. They undergo gating processes where they open and close upon an external stimulus, such as the presence of a particular biomolecule, the ligand. When the gating process is observed and is quantitatively measured, one can derive data about the presence and the amount of the ligand. Hence, the nanopores can be utilized for specific sensing. However, biological nanopores are embedded in a biological cell membrane that is fragile and unstable with respect to storage and application. The iNAPO (ion conducting nanopores) project aims at combining robust polymer-based nanopores with protein-based biological nanopores, thus combining the selectivity and sensitivity of the latter with the stability and processibility of the first ones. This paper describes the different steps in the fabrication of ion conducting nanopores. It begins with ion irradiation of polymer foils, combined with chemical etching of the ion damage tracks into nanopores. By means of chemical coupling reactions, the nanopore walls are functionalized with particular molecules which react or bioconjugate with the molecules to be analyzed. As an example, a recent result on sensing a physiologically active phosphorus-based anion is shown. By means of a complexation reaction with Zn-di(picolyl)amine, the selective measurement of the concentration of the anion pyrophosphate is demonstrated. In the final step of the project, the nanopores will be incorporated into a Lab-on-Chip system for applications in e.g. medical diagnostics and environmental analysis.

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“…As a result of these processes, covalent bonds between the atoms of the polymeric network are cut, leading to severe radiation damage. Small volatile degradation products including hydrogen, hydrocarbons and carbon oxides, migrate out of the foil into vacuum, leaving back a cylindrical so-called ion track, a zone with reduced density and modified chemical reactivity [7,8].…”

Section: Ion Irradiation: Formation Of An Ion Damage Trackmentioning

confidence: 99%

The iNAPO Project: Biomimetic Nanopores for a New Generation of Lab-on-Chip Micro Sensors

Ensinger¹,

Ali²,

Nasir³

et al. 2017

Proceedings of the 2nd World Congress on Recent Advances in Nanotechnology

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-In nature, ion conducting nanopores play a vital role for the function of living cells. They undergo gating processes where they open and close upon an external stimulus, such as the presence of a particular biomolecule, the ligand. When the gating process is observed and is quantitatively measured one can derive data about the presence and the amount of the ligand. Hence, the nanopores can be utilized for specific sensing. However, biological nanopores are embedded in a biological cell membrane that is fragile and unstable with respect to storage and application. The iNAPO project aims at combining robust polymer-based nanopores with protein-based biological nanopores, thus combining the selectivity and sensitivity of the latter with the stability and processability of the first ones. This paper describes the different steps in the fabrication of ion conducting nanopores. It begins with ion irradiation of polymer foils, combined with chemical etching of the ion damage tracks into nanopores. By means of chemical coupling reactions, the nanopore walls are functionalized with particular molecules which react or bioconjugate with the molecules to be analyzed. As an example, a recent result on sensing a physiologically active P-based anion is shown. By means of a complexation reaction with Zn-di(picolyl)amine, the selective measurement of the concentration of the anion pyrophosphate is demonstrated. In the final step of the project, the nanopores will be incorporated into a Lab-on-Chip system for applications in e.g. medical diagnostics and environmental analysis.

show abstract

Size characterization of ion tracks in PET and PTFE using SAXS

Cited by 23 publications

References 19 publications

Highly Selective Ionic Transport through Subnanometer Pores in Polymer Films

Highly Selective Ionic Transport through Subnanometer Pores in Polymer Films

The iNAPO Project: Biomimetic Nanopores for a New Generation of Lab-on-Chip Micro Sensors

The iNAPO Project: Biomimetic Nanopores for a New Generation of Lab-on-Chip Micro Sensors

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