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Title: Stimulus-responsive shrinkage in electrospun membranes: fundamentals and control
Authors: Fang, Feiyu
Wang, Han
Wang, Huaquan
Huang, Wei Min
Chen, Yahui
Cai, Nian
Chen, Xindu
Chen, Xin
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: Fang, F., Wang, H., Wang, H., Huang, W. M., Chen, Y., Cai, N., Chen, X. & Chen, X. (2021). Stimulus-responsive shrinkage in electrospun membranes: fundamentals and control. Micromachines, 12(8), 920-.
Journal: Micromachines
Abstract: Shrinkage is observed in many electrospun membranes. The stretched conformation of the macromolecular chains has been proposed as the possible cause. However, so far, our understanding of the fundamentals is still qualitative and cannot provide much help in the shrinkage control. In this paper, based on the crimped fibers after stimulus-induced shrinkage, a clear evidence of buckling, the gradient pre-strain field in the cross-section of the electrospun fibers, which is the result of a gradient solidification field and a tensile force in the fibers during electrospinning, is identified as the underlying mechanism for the stimulus-induced shrinkage. Subsequently, two buckling conditions are derived. Subsequently, a series of experiments are carried out to reveal the influence of four typical processing parameters (namely, the applied voltage, solution concentration, distance between electrodes, and rotation speed of collector), which are highly relevant to the formation of the gradient pre-strain field. It is concluded that there are some different ways to achieve the required shrinkage ratios in two in-plane directions (i.e., the rotational and transverse directions of the roller collector). Some of the combinations of these parameters are more effective at achieving high uniformity than others. Hence, it is possible to optimize the processing parameters to produce high-quality membranes with well-controlled shrinkage in both in-plane directions.
ISSN: 2072-666X
DOI: 10.3390/mi12080920
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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