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生物离子通道能够对环境刺激作出响应,有效地调节细胞内外的物质平衡,保证体内的正常生命活动.研究具有生物离子通道功能的人工离子通道对发展离子开关具有重要的意义.本工作利用电化学去合金法制备了具有三维通道结构的纳米多孔金膜,并将其应用于离子通道,研究其离子输运性质.在电场作用下,纳米多孔金由于发生极化而使通道表现出离子整流性质.在纳米多孔金表面修饰十二烷基硫醇单分子层,利用其疏水效应,通道能够阻止离子的传输,使其处于“关闭”态.溶液中的化学刺激如表面活性剂能够增强电解质溶液在通道表面的浸润,有利于离子的传输,使通道处于“打开”态.这种单分子层修饰的纳米多孔金表现出表面活性剂响应的离子开关特性.
Biological ion channels can respond to environmental stimuli and effectively regulate the material balance inside and outside the cells to ensure the normal life activity in vivo.It is important to develop artificial ion channels with biological ion channels to develop ion switches.In this work, To the alloy prepared by the three-dimensional channel structure of nano-porous gold film, and its application to the ion channel, ion transport properties of its study in the electric field, due to the polarization of porous gold nano-channel showed ion rectification By modifying the dodecyl mercaptan monolayer on the nanoporous gold surface, the channel prevents the transport of ions by turning them into a “closed” state by the hydrophobic effect, chemical stimuli in solution such as surfactants can enhance The electrolyte solution is infiltrated into the channel surface to facilitate the transport of ions, leaving the channel in the “on” state. This monolayer-modified nanoporous gold exhibits the ionic switching characteristics of the surfactant response.