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Diode-like single-ion track membrane prepared by electro-stopping
Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Moscow Region, 141980, Russia.
2001 (English)Article in journal (Refereed) Published
Abstract [en]

The prepn. of an asym. membrane in poly(ethylene terephthalate) (PET) is described, using a combination of chem. and electro-stopping. For this purpose, a single-ion-irradiated PET film is inserted into an electrolytic cell and etched from one side in 9 M sodium hydroxide while bathing the other side in a mixt. of 2 M KCl and 2 M HCOOH (1:1 by vol.), elec. retracting the OH- ions from the tip of the etch pit during pore break-through. When a preset current has been reached, the etch process is interrupted by replacing the etching soln. with acidic 1 M potassium chloride soln. After etching, the current-voltage (I-V) characteristic is detd. under sym. bathing conditions, immersing both sides of the membrane in KCl solns. of identical concn. (0.01-1 M) and pH (3-8). The I-V characteristic is strongly non-linear, comparable to that of an elec. diode. If the polarity during etching is reversed, pushing the OH- ions into the tip of the etch pit, the resulting pores are larger and the degree of asymmetry smaller. The importance of electro-stopping is compared with chem. stopping.

Place, publisher, year, edition, pages
2001. Vol. 184, 337-346 p.
Research subject
URN: urn:nbn:se:uu:diva-111265OAI: oai:DiVA.org:uu-111265DiVA: diva2:285385
Available from: 2010-01-11 Created: 2009-12-08 Last updated: 2011-01-17
In thesis
1. Ion Tracks for Micro- and Nanofabrication: From Single Channels to Superhydrophobic Surfaces
Open this publication in new window or tab >>Ion Tracks for Micro- and Nanofabrication: From Single Channels to Superhydrophobic Surfaces
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A method is described for preset-count irradiations between 1 and 100 ions singling-out individual ions from an ion beam with more than a billion ions arriving per second. The ion tracks are etched in a conductometric system with real-time evaluation of the acquired data. The etch process can be interrupted when reaching a preset channel diameter. Cylindrical channels are obtained by adding surfactants to the etch solution forming a self-assembled barrier between etching medium and polymer. Asymmetric etching of single ion tracks leads to pH sensitive conical pores with diode-like properties. Using etched channels as template, homogeneous and multilayer magnetic single-wires are electrodeposited. The magnetoresistivity of the wires is studied. Single-track applications comprise critical apertures (cylindric, conic, necked), asymmetric pores (pH sensitive, biospecific), Giant Magneto Resistance sensors, and spintronic devices.

On the basis of studies with individual ion tracks we tackled tilted multiporous systems such as ion beam lithography with a masked ion beam leading to micro-structures with inclined walls and anisotropic superhydrophobic ion track textures, analogous to biological shingle structures on butterfly wings. We demonstrated qualitatively, that the asymmetry of the texture translates into motion under ultrasonic agitation. This could lead to the development of rotary drives.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 63 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 700
Ion track, single ion, real time, phase detection, conductometric cell, conductometry, electro replication, microtechnology, nanotechnology, surfactant, self organization, GMR, magnetic, sensor technology, hydrophobic, tilted texture.
National Category
Physical Sciences
Research subject
Materials Science
urn:nbn:se:uu:diva-111247 (URN)978-91-554-7683-0 (ISBN)
Public defence
2010-01-29, Polhemsaalen, Ångström Laboratorium, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Available from: 2010-01-07 Created: 2009-12-08 Last updated: 2010-01-15

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