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    题名: Importance of Polyelectrolyte Modification for Rectifying the Ionic Current in Conically Shaped Nanochannels
    作者: Hsu, J.P., Wu, H.H., C.Y. Lin, and S. Tseng
    日期: 2017-02
    上传时间: 2018-04-14 12:10:36 (UTC+8)
    摘要: Due to its capability of mimicking ion channels in living
    organisms, the ionic transport in artificial nanochannels/nanopores
    has drawn the attention of researchers in various
    fields.1–3 Recent advances in nanochannel/nanopore fabrication
    technology also make relevant applications versatile. These
    include, for example, sensing of biomolecules and ions,4–12 ionic
    gates,13–15 energy conversion,16–18 and water desalination.19
    Fu et al.4 showed that nanopipettes can be used in DNA sequencing
    through monitoring the ionic current shift. Ali et al.5 studied the
    binding capability of calcium ions by a conical nanopore coated
    with poly acid chains. Umehara et al.6 proposed the use of
    various materials and methods for nanopipettes based biosensing.
    German et al.8 and Lan et al.9 investigated the translocation
    of nanoparticles in a glass nanopore. Vogel et al.10
    estimated the size of a nanoparticle by its translocation in a
    polymeric conical nanopore.
    As the size of a nanochannel is down to the order of the
    Debye length (or the thickness of an electric double layer, EDL),
    the overlapping of EDLs yields distinctive electrokinetic
    phenomena including, for example, ion concentration polarization
    (ICP),20,21 ion selectivity,22,23 and ionic current rectification
    (ICR).24–27 ICR is the phenomenon that a nanochannel/
    nanopore shows a diode-like current–voltage behavior, or the
    preference for ionic current in a certain direction when an
    electric potential bias is applied. In biological science, ICR is
    observed in ion channels such as those of K+ and Na+.28–30 For
    charged nanochannels, ICR might arise from, for instance,
    asymmetric pore geometry,26,31–34 the imposed salt gradient,22,35–37
    and bipolar surface properties.38–41
    Polyelectrolyte (PE) is often used to modify the surface of
    inorganic13,36,42,43 and organic nanochannels,14,44,45 providing
    them a versatile characteristic and, therefore, an ICR nature.44,46
    Zhang et al.,13 for example, found that a glass conical nanopore
    modified by poly[2-(dimethylamino)ethyl methacrylate], a smart
    homopolymer capable of undergoing conformational transitions
    stimulated by pH and temperature, exhibits ICR behavior.
    Umehara et al.42 showed that after coating with poly-L-lysine a
    quartz nanopipette is capable of amplifying ionic current and
    giving a rectification direction opposite to that of an uncoated
    nanopipette. In a study of the ICR of a glass nanopipette coated
    with PEI, Deng et al.36 found that its rectification factor has a
    local maximum as the bulk salt concentration varies, regardless
    of whether a salt gradient is applied. The coating of materials
    on a nanopore also provides a way for estimating the pKa of
    the coating materials through the experimentally measured
    pH–ionic current relationship. Liu et al.,43 for instance, estimated
    the pKa of polyethyleneimines (PEIs) by coating them on a glass
    關聯: Physical Chemistry Chemical Physics 19, 5351-5360
    DOI: 10.1039/c6cp07693a
    显示于类别:[數學學系暨研究所] 期刊論文


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