标题: Scalable, cationic chitosan nanofluidic cables with aligned nanochannels

作者: Zhang, JX (Zhang, Jingxian); Shi, XW (Shi, Xiaowen); Deng, HB (Deng, Hongbing); Du, YM (Du, Yumin)

来源出版物: CHEMICAL ENGINEERING JOURNAL 卷: 490 文献号: 151836 DOI: 10.1016/j.cej.2024.151836 Published Date: 2024 JUN 15

摘要: Due to the unique behavior of ion transport within confined nanochannels, nanofluidics has gained everincreasing popularity in power generation, desalination, sensor and DNA sequencing. Both the anionic and cationic nanofluidic devices are of importance in their practical applications as the movement of the ions can be effectively regulated by the surface charge of the nanochannels. However, the emerging technology primarily focuses on anionic nanofluidic devices, while the straightforward, scalable and economical fabrication of cationic nanofluidic devices remains challenging. Herein, a bottom-up approach to aligned cationic nanofluidic films/ cables, which fully harnesses the inherent positive charges on chitosan chains, is proposed. The cationic nanofluidic films are prepared directly through the ionic crosslinks between positively charged chitosan chains and negatively charged sodium dodecyl sulfate micelles via interfacial-diffusion-induced gelation, which feature favorable optical transparency, flexibility, thermal stability, tensile strength, anti-swelling ability, long-term stability and environmental tolerance. Furthermore, the resulting films can be stretched into aligned films and further twisted into ionic cables with a tensile strength of 131 MPa. Thanks to the well-aligned nanofluidic channels and the inherently positively-charged surface, the ionic cables exhibit a surface-charge-governed ion transport phenomenon as well as anion selectivity. The ionic conductivity of the ionic cable reaches 2.4 x 10 -4 S & sdot; cm - 1 at low salt concentrations (4.1 x 10 -4 S & sdot; cm - 1 for aligned films). This work not only provides a straightforward, scalable, cost-effective strategy for cationic nanofluidic devices through leveraging the inherent properties of natural polymers, but also offers promising opportunities for the underutilized biomass to be transformed into value-added products.

作者关键词: Nanofluidics; Chitosan; Sodium dodecyl sulfate; Aligned nanochannels; Ionic cables

地址: [Zhang, Jingxian; Shi, Xiaowen; Deng, Hongbing; Du, Yumin] Wuhan Univ, Hubei Engn Ctr Nat Polymers Based Med Mat, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430079, Peoples R China.

通讯作者地址: Shi, XW (通讯作者)，Wuhan Univ, Hubei Engn Ctr Nat Polymers Based Med Mat, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430079, Peoples R China.

电子邮件地址: shixw@whu.edu.cn

影响因子：13.3