Investigation of the radial pore-etching rate in a plastic track detector as a function of the local damage density around the ion path

Apel, P.Yu.; Pretzsch, G.

doi:10.1016/1359-0189(86)90019-1

Cited by 40 publications

(8 citation statements)

References 20 publications

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“…This suggests that in alkali etching of irradiated films, the alkali acts as an initiation agent, destroying traps in the core and triggering electron catalysis that vastly speeds up the fragmentation of the PET chain molecules in the latent track cores. We believe that this electron catalysis in the cores explains the huge difference in the etching rates of irradiated PET films along and across the direction of the irradiating ion paths [ 47 ].…”

Section: Discussionmentioning

confidence: 99%

Urbach Rule in the Red-Shifted Absorption Edge of PET Films Irradiated with Swift Heavy Ions

et al. 2022

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This paper presents a new analysis of the experimental transmission spectra of polyethylene terephthalate (PET) films before and after irradiation with swift heavy ions (SHI) films, as reported previously by the authors. It is shown that the absorption edge red shift for irradiated films contains two regions of exponential form, one of which is located in the UV region and the other at lower energy, mainly in the visible part of the spectrum. The behaviour of the transmission curves under different irradiating fluences demonstrates that these two regions reflect respectively the electron-enriched core of the latent track and its electron-depleted peripheral halo. The focal point method yields a bandgap energy of 4.1 eV for the electron-enriched core of the latent track, which is similar to n-doped semiconductors, and a bandgap of about 1.3–1.5 eV for the electron-depleted halo, similar to p-doped semiconductors. The boundary between the latent track cores and halos corresponds to a conventional semiconductor p-n junction. The values of the characteristic Urbach energy determined from experimental data correspond to the nonradiative transition energy between the excited singlet and triplet levels of benzene-carboxyl complexes in repeat units of the PET chain molecule. A parallel is drawn between the SHI-induced redistribution of electrons held in structural traps in the PET film and chemical redox reactions, which involve the redistribution of electrons in chemical bonds. It is suggested that alkali etching triggers the release of excess electrons in the latent track cores, which act as a catalyst for the fragmentation of PET chain molecules along the latent tracks of the SHI irradiation.

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Section: Discussionmentioning

confidence: 99%

Urbach Rule in the Red-Shifted Absorption Edge of PET Films Irradiated with Swift Heavy Ions

et al. 2022

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“…We will cite some publications in which similar estimates were obtained for PET membranes. Measurements of enhanced conductivity as a function of KCl concentration in cylindrical pores as small as 15 and 30 nm in diameter yielded a fixed charge density of 0.5 e nm −2 [55]. The reversible ionic dye binding applied to PET membranes with micro-pores resulted in a COOH-group surface density of 0.3 nm −2 [56].…”

Section: Surface Charge Density In Poresmentioning

confidence: 99%

Effect of nanopore geometry on ion current rectification

et al. 2011

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This paper initially investigates the previous works on foldable structures. Subsequently, generation and geometric (architectural) design of compatible foldable structures with scissor-like elements is formulated for various shapes of barrels with no geometric limitations (free forms) for the purpose of configuration processing. Special cases for configuration processing based on given formulation are studied to obtain different geometries. For example, the division of the sum of the internal angles of duplets leads to different geometries. The method employed for this division could be equal between duplets, according to arithmetic or geometric progression, or using algebraic equations. These methods are used to divide the sum of internal angles and radius of curvature; Corresponding geometries are then created and compared. The method to generate a geometry imposed by architectural requirements is also proposed in this work. Using such ordering, one can create and model free form foldable structures. To provide changeability for geometry of the structure, a special mid-connection (pivot) is proposed and a prototype model is constructed to demonstrate the efficiency. To construct real scale foldable structures, some connections and a simple method to analyze and design of this type of connections are proposed. A graph of maximum displacement vs. height of the structure is illustrated. A design-construct methodology for foldable structures is proposed.

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“…For the surface charge density, we have considered the values r = -0.1 and -0.5 e/nm 2 , which are equivalent to fixed charge concentrations X : -2r/FR p = 0.11 and 0.55 M. These values are typical of nanopores (Westermann-Clark and Christoforou 1986; Apel and Pretzsch 1986;Manzanares et al 1991;Ramírez et al 2003b;Chun et al 2006;Ku et al 2007). The external electrolyte concentrations have been assigned values between 0 and 0.8 M. The radii ratio R i /R p assumes values ranging from 0 (point ions) to 0.1 (R i = 0.3 nm).…”

Section: Theoretical Modelingmentioning

confidence: 99%

Incorporating ionic size in the transport equations for charged nanopores

Cervera

Ramı́rez

Manzanares

et al. 2009

Microfluid Nanofluid

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Nanopores with fixed charges show ionic selectivity because of the high surface potential and the small pore radius. In this limit, the size of the ions could no longer be ignored because they occupy a significant fraction of the pore and, in addition, they would reach unrealistic concentrations at the surface if treated as point charges. However, most models of selectivity assume point ions and ignore this fact. Although this approach shows the essential qualitative trends of the problem, it is not strictly valid for high surface potentials and low nanopore radii, which is just the case where a high ionic selectivity should be expected. We consider the effect of ion size on the electrical double layer within a charged cylindrical nanopore using an extended Poisson-Boltzmann equation, paying special attention to (non-equilibrium) transport properties such as the streaming potential, the counter-ion transport number, and the electrical conductance. The first two quantities are related to the nanopore selectivity while the third one characterizes the conductive properties. We discuss the nanopore characteristics in terms of the ratio between the electrolyte and fixed charge concentrations and the ratio between the ionic and nanopore radii showing the experimental range where the point ion model can still be useful. Even for relatively small inorganic ions at intermediate concentrations, ion size effects could be significant for a quantitative estimation of the nanopore selectivity in the case of high surface charge densities.

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Investigation of the radial pore-etching rate in a plastic track detector as a function of the local damage density around the ion path

Cited by 40 publications

References 20 publications

Urbach Rule in the Red-Shifted Absorption Edge of PET Films Irradiated with Swift Heavy Ions

Urbach Rule in the Red-Shifted Absorption Edge of PET Films Irradiated with Swift Heavy Ions

Effect of nanopore geometry on ion current rectification

Incorporating ionic size in the transport equations for charged nanopores

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