Quantum Dots on a String: In Situ Observation of Branching and Reinforcement Mechanism of Electrospun Fibers.

Autor: Lou L; Plasma Forming Laboratory, Mechanical and Materials Engineering, School of Biomedical, Materials and Mechanical Engineering, College of Engineering and Computing, Florida International University, Miami, FL, 33174, USA., Dolmetsch T; Plasma Forming Laboratory, Mechanical and Materials Engineering, School of Biomedical, Materials and Mechanical Engineering, College of Engineering and Computing, Florida International University, Miami, FL, 33174, USA., Aguiar BA; Plasma Forming Laboratory, Mechanical and Materials Engineering, School of Biomedical, Materials and Mechanical Engineering, College of Engineering and Computing, Florida International University, Miami, FL, 33174, USA., Mohammed SMAK; Plasma Forming Laboratory, Mechanical and Materials Engineering, School of Biomedical, Materials and Mechanical Engineering, College of Engineering and Computing, Florida International University, Miami, FL, 33174, USA., Agarwal A; Plasma Forming Laboratory, Mechanical and Materials Engineering, School of Biomedical, Materials and Mechanical Engineering, College of Engineering and Computing, Florida International University, Miami, FL, 33174, USA.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Aug; Vol. 20 (34), pp. e2311073. Date of Electronic Publication: 2024 Apr 02.
DOI: 10.1002/smll.202311073
Abstrakt: Immobilization of quantum dots (QDs) on fiber surfaces has emerged as a robust approach for preserving their functional characteristics while mitigating aggregation and instability issues. Despite the advancement, understanding the impacts of QDs on jet-fiber evolution during electrospinning, QDs-fiber interface, and composites functional behavior remains a knowledge gap. The study adopts a high-speed imaging methodology to capture the immobilization effects on the QDs-fiber matrix. In situ observations reveal irregular triangular branches within the QDs-fiber matrix, exhibiting distinctive rotations within a rapid timeframe of 0.00667 ms. The influence of FeQDs on Taylor cone dynamics and subsequent fiber branching velocities is elucidated. Synthesis phenomena are correlated with QD-fiber's morphology, crystallinity, and functional properties. PAN-FeQDs composite fibers substantially reduced (50-70%) nano-fibrillar length and width while their diameter expanded by 17%. A 30% enhancement in elastic modulus and reduction in adhesion force for PAN-FeQDs fibers is observed. These changes are attributed to chemical and physical intertwining between the FeQDs and the polymer matrix, bolstered by the shifts in the position of C≡N and C═C bonds. This study provides valuable insights into the quantum dot-fiber composites by comprehensively integrating and bridging jet-fiber transformation, fiber structure, nanomechanics, and surface chemistry.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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