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Manufacture, observation, and test of membranes with locatable single pores
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© 1986 AIP Publishing. This is the accepted version of the following article: Packard, R. E. & Pekola, Jukka & Price, P. B. & Spohr, R. N. R. & Westmacott, K. H. & Yu-Qun, Zhu. 1986. Manufacture, observation, and test of membranes with locatable single pores. Review of Scientific Instruments. Volume 57, Issue 8. 1654-1660. ISSN 0034-6748 (printed). DOI: 10.1063/1.1138545, which has been published in final form at
http://scitation.aip.org/content/aip/journal/rsi/57/8/10.1063/1.1138545
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School of Science |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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1654-1660
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Review of Scientific Instruments, Volume 57, Issue 8
Abstract
A method for generating single pores down to 0.1 μm diameter in the center of a large circular foil is described, based on nuclear tracks. The foil is framed by a tension ring which enables one to handle the foils in a well‐defined precise way. The single pore has a lateral displacement of ±0.1 mm with respect to the tension ring center. The foils used are polycarbonate of the type Makrofol and have thicknesses between 2 and 10 μm. For calibration of the single pore diameters, multiple nuclear tracks between 0.1 and 3.5 μm diameter are etched and observed by microscopy. The microscopic observations are compared with gas‐flow measurements, using two alternative methods: multiple holes are tested under viscous flow conditions of N2 gas at normal temperature and pressure; single holes are tested under collisionless flow conditions of 4He gas at liquid‐nitrogen temperature, using a capacitance method.
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Packard, R. E. & Pekola, Jukka & Price, P. B. & Spohr, R. N. R. & Westmacott, K. H. & Yu-Qun, Zhu. 1986. Manufacture, observation, and test of membranes with locatable single pores. Review of Scientific Instruments. Volume 57, Issue 8. 1654-1660. ISSN 0034-6748 (printed). DOI: 10.1063/1.1138545.