A Funnel-Shaped Chloride Nanochannel Inspired By ClC Protein

Chloride transport participates in a great variety of physiological activities, such as regulating electrical excitability and maintaining acid–base equilibrium. However, the high flux is the prerequisite to ensure the realization of the above functions. Actually, the high flux of ion transport is significant, not only for living things but also for practical applications. Herein, inspired by chloride channel (ClC) protein, a novel NH2-pillar[5]arene functionalized funnel-shaped nanochannel was designed and constructed. The introduction of functional molecules changed surface charge property and endowed the nanochannel with Cl– selectivity, which facilitated Cl– transport. Moreover, by adjusting the asymmetric degree of the nanochannel, the Cl– transport flux can be improved greatly. The successful construction of an artificial ion channel with high flux will be much useful for practical applications like microfluidic devices, sensors, and ion separation.