Preparation of oriented attapulgite nanofibers using evaporation induced self-assembly

Mengting Jiang, Hengyang Mao, Shouyong Zhou, Shuo Shi, Meisheng Li, Ailian Xue, Yijiang Zhao, Qi Zhang, Zhentao Wu

Research output: Contribution to journalArticlepeer-review

Abstract

Aligned nanofibers have great application prospects in the field of electron transport and separation. In this work, a nano-attapulgite-based alignment technique was developed. The suspension was prepared from nano attapulgite (ATP), and polystyrene sulfonate sodium (PSS) was introduced to promote the dispersion and stability of ATP. The PSS can adjust the zeta potential of ATP from − 15 to − 50 mV. And the molecular dynamics results also showed that the appropriate PSS can increase the repulsion between ATP by 1.1 × 104 KJ·mol−1. Then ATP layer on the glass substrate was prepared by drop coating and induced evaporation. The results showed that the stability of the suspension played a decisive role in the alignment effect of ATP. ATP would be aligned from the three-phase contact line of air, suspension and substrate, and the width of the alignment interval can reach 1.2 mm, when the content of ATP and PSS was 2 mg·mL−1 and 1 mg·mL−1, respectively. On this basis, an improved alignment technique called “restricted evaporation” was proposed. The three-phase line was pinned many times during the restricted evaporation process, which was beneficial to the alignment of ATP, and the directional alignment interval can be increased to about 20 mm.
Original languageEnglish
Article number130125
Number of pages12
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume655
Early online date7 Sep 2022
DOIs
Publication statusPublished - 20 Dec 2022

Keywords

  • Attapulgite
  • Alignment
  • Restricted evaporation
  • Induced evaporation
  • Suspension

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