Evidence of gating in hundred nanometer diameter pores: an experimental and theoretical study

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We report on the observation of an unexpected gating mechanism at the 100 nm scale on track-etched polycarbonate membranes. Transport measurements of methyl viologen performed by absorption spectroscopy under various pH conditions demonstrated that perfect gating was achieved for 100 nm diameter pores at pH 2, while the positively charged molecular ions moved through the membrane according to diffusion laws at pH 5. An oppositely charged molecular ion, naphthalene disulfonate, in the same membrane, showed the opposite trend: diffusion of the negative ion at pH 2 and perfect gating at pH 5. The influence of parameters such as ionic strength ... continued below

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Letant, S E; Schaldach, C M; Johnson, M R; Sawvel, A; Bourcier, W L & Wilson, W D January 11, 2006.

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We report on the observation of an unexpected gating mechanism at the 100 nm scale on track-etched polycarbonate membranes. Transport measurements of methyl viologen performed by absorption spectroscopy under various pH conditions demonstrated that perfect gating was achieved for 100 nm diameter pores at pH 2, while the positively charged molecular ions moved through the membrane according to diffusion laws at pH 5. An oppositely charged molecular ion, naphthalene disulfonate, in the same membrane, showed the opposite trend: diffusion of the negative ion at pH 2 and perfect gating at pH 5. The influence of parameters such as ionic strength and membrane surface coating were also investigated. A theoretical study of the system shows that at this larger length scale the magnitude of the electric field in the vicinity of the pores is too small to account for the experimental observations, rather, it is the surface trapping of the mobile ion (Cl{sup -} or Na{sup +}) which gives rise to the gating phenomena. This surprising effect might have potential applications for high-throughput separation of large molecules and bio-organisms.

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PDF-file: 21 pages; size: 0.8 Mbytes

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  • Journal Name: Small, vol. 2, no. 12, November 1, 2006, pp. 1504-1510

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  • Report No.: UCRL-JRNL-218429
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 898017
  • Archival Resource Key: ark:/67531/metadc881704

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 11, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 28, 2016, 1:47 p.m.

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Letant, S E; Schaldach, C M; Johnson, M R; Sawvel, A; Bourcier, W L & Wilson, W D. Evidence of gating in hundred nanometer diameter pores: an experimental and theoretical study, article, January 11, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc881704/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.