Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control
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, base...
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MDPI AG
2021-07-01
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| author | Feiyu Fang Han Wang Huaquan Wang Wei Min Huang Yahui Chen Nian Cai Xindu Chen Xin Chen |
| author_facet | Feiyu Fang Han Wang Huaquan Wang Wei Min Huang Yahui Chen Nian Cai Xindu Chen Xin Chen |
| author_sort | Feiyu Fang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T08:35:03Z |
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| id | doaj.art-49971853d4f44e588027dd6daea9b54f |
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| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-10T08:35:03Z |
| publishDate | 2021-07-01 |
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| spelling | doaj.art-49971853d4f44e588027dd6daea9b54f2023-11-22T08:44:04ZengMDPI AGMicromachines2072-666X2021-07-0112892010.3390/mi12080920Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and ControlFeiyu Fang0Han Wang1Huaquan Wang2Wei Min Huang3Yahui Chen4Nian Cai5Xindu Chen6Xin Chen7Guangdong Provincial Key Laboratory of Micro-Nano Manufacturing Technology and Equipment, School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, ChinaGuangdong Provincial Key Laboratory of Micro-Nano Manufacturing Technology and Equipment, School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, ChinaChina Resources Cement Technology Research and Development Co., Ltd., Guangzhou 510460, ChinaSchool of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, SingaporeSchool of Physical Science and Technology, Soochow University, Suzhou 215006, ChinaSchool of Information Engineering, Guangdong University of Technology, Guangzhou 510006, ChinaGuangdong Provincial Key Laboratory of Micro-Nano Manufacturing Technology and Equipment, School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, ChinaGuangdong Provincial Key Laboratory of Micro-Nano Manufacturing Technology and Equipment, School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, ChinaShrinkage 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.https://www.mdpi.com/2072-666X/12/8/920electrospinningshrinkagebucklingshape memory effectgradient strain field |
| spellingShingle | Feiyu Fang Han Wang Huaquan Wang Wei Min Huang Yahui Chen Nian Cai Xindu Chen Xin Chen Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control Micromachines electrospinning shrinkage buckling shape memory effect gradient strain field |
| title | Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control |
| title_full | Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control |
| title_fullStr | Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control |
| title_full_unstemmed | Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control |
| title_short | Stimulus-Responsive Shrinkage in Electrospun Membranes: Fundamentals and Control |
| title_sort | stimulus responsive shrinkage in electrospun membranes fundamentals and control |
| topic | electrospinning shrinkage buckling shape memory effect gradient strain field |
| url | https://www.mdpi.com/2072-666X/12/8/920 |
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