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首页> 外文期刊>Science Advances >“Uphill” cation transport: A bioinspired photo-driven ion pump
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“Uphill” cation transport: A bioinspired photo-driven ion pump

机译：“上坡”阳离子传输：受生物启发的光驱动离子泵

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Biological ion pumps with active ionic transport properties lay the foundation for many life processes. However, few analogs have been produced because extra energy is needed to couple to this “uphill” process. We demonstrate a bioinspired artificial photo-driven ion pump based on a single polyethylene terephthalate conical nanochannel. The pumping process behaving as an inversion of zero-volt current can be realized by applying ultraviolet irradiation from the large opening. The light energy can accelerate the dissociation of the benzoic acid derivative dimers existing on the inner surface of nanochannel, which consequently produces more mobile carboxyl groups. Enhanced electrostatic interaction between the ions traversing the nanochannel and the charged groups on the inner wall is the key reason for the uphill cation transport behavior. This system creates an ideal experimental and theoretical platform for further development and design of various stimuli-driven and specific ion–selective bioinspired ion pumps, which anticipates wide potential applications in biosensing, energy conversion, and desalination.
机译：具有主动离子传输特性的生物离子泵为许多生命过程奠定了基础。但是，由于需要额外的能量来耦合这种“上坡”过程，因此很少生产类似物。我们演示了基于单个聚对苯二甲酸乙二醇酯圆锥形纳米通道的生物启发式人工光驱动离子泵。通过从大开口施加紫外线照射，可以实现表现为零伏电流倒置的泵浦过程。光能可以加速存在于纳米通道内表面上的苯甲酸衍生物二聚体的离解，从而产生更多的可移动羧基。穿过纳米通道的离子与内壁上带电基团之间增强的静电相互作用是导致阳离子迁移行为上升的关键原因。该系统为进一步开发和设计各种刺激驱动的和特定的离子选择性生物启发离子泵创造了理想的实验和理论平台，该平台有望在生物传感，能量转换和脱盐方面获得广泛的应用。

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