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Research Article

Double-stretching as an effective and generalizable strategy towards thinner nanofibers in solution blow spinning

Baopu Zhang1,2Ziwei Li1Zekun Cheng1Lei Li1Chong Yang1Haiyang Wang1Hui Wu1( )
State Key Laboratory of Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge 02139, USA
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Graphical Abstract

This work develops a novel strategy termed double-stretching solution blow spinning (DS-SBS). Applying computational fluid dynamics, we compare the mechanisms underlying DS-SBS and the traditional SBS. It is discovered that DS-SBS exerts an extra stretching force on the fiber, which reduces its diameter into the sub-100 nanometers range, an inaccessible scale for the traditional SBS strategy.

Abstract

Solution blow spinning (SBS) applies high-speed airflow to prepare fibers by generating a strong stretching force. It has the advantages of scalable production, tailorable morphologies, and wide applicability. Yet, the SBS strategy can hardly prepare fibers down to the sub-100 nanometers, which limits its performance in demanding applications. Herein, we overcome the limitation of SBS by introducing a second airflow. This novel strategy is termed double-stretching SBS (DS-SBS) because an extra stretching force is exerted on the fiber when it converges with the second airflow. Polyamide6 nanofibers with an average diameter of 80 nm are successfully prepared with the DS-SBS strategy, while the SBS strategy could only prepare submicron fibers with an average diameter of 120 nm. Further, the generality of the DS-SBS strategy to reduce fiber diameter is verified on numerous solute–solvent pairs.

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Nano Research
Pages 5709-5714
Cite this article:
Zhang B, Li Z, Cheng Z, et al. Double-stretching as an effective and generalizable strategy towards thinner nanofibers in solution blow spinning. Nano Research, 2023, 16(4): 5709-5714. https://doi.org/10.1007/s12274-022-5198-1
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Received: 01 June 2022
Revised: 18 September 2022
Accepted: 14 October 2022
Published: 29 December 2022
© Tsinghua University Press 2022
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