Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.; University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Sci Adv. 2016 Oct 19;2(10):e1600689. doi: 10.1126/sciadv.1600689. eCollection 2016 Oct.
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.
具有主动离子输运特性的生物离子泵为许多生命过程奠定了基础。然而，由于需要额外的能量来耦合到这个“上坡”过程，因此很少有类似物被制造出来。我们展示了一种基于单个聚对苯二甲酸乙二醇酯锥形纳米通道的仿生人工光驱动离子泵。通过从大开口施加紫外光照射，可以实现表现为零伏电流反转的泵送过程。光能加速存在于纳米通道内表面的苯甲酸衍生物二聚体的解离，从而产生更多的可移动羧基。离子穿过纳米通道与内壁上的带电基团之间增强的静电相互作用是上坡阳离子输运行为的关键原因。该系统为进一步开发和设计各种刺激驱动和特定离子选择性仿生离子泵提供了理想的实验和理论平台，预计在生物传感、能量转换和脱盐等领域有广泛的潜在应用。
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