한국가시화정보학회지 (Journal of the Korean Society of Visualization)

  • 제16권3호
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  • Pages.40-46
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  • 2018
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  • 1598-8430(pISSN)
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  • 2093-808X(eISSN)
한국가시화정보학회 (The Korean Society of Visualization)
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고분자 용액이 전기방사된 표면의 구조 가시화

Visualization of surface structures coated by electrospun polymers

  • Lee, Saebom (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Lee, Minki (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Yang, Sanghyeok (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Seunghyun (School of Chemical Engineering, Sungkyunkwan University) ;
  • Kim, HyeongJin (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Sung, Seokwon (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Lee, Minseong (School of Chemical Engineering, Sungkyunkwan University) ;
  • Lee, Jinkee (School of Mechanical Engineering, Sungkyunkwan University)
  • 투고 : 2018.11.16
  • 심사 : 2018.12.27
  • 발행 : 2018.12.31
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초록

The surface structure of the electrospun polymer fibers depends on the polymer concentration, the type of solvent used, applied voltage and so on. To make a desired surface, it is important to understand the effects of the physicochemical properties to form a stable Taylor cone and jet dispensation. We observed the formation of Taylor cone and a consequent structure of fiber by controlling the parameters of applied voltage, solution concentration, solvent and collector effectively. Once the surfaces were fabricated, the structures were analyzed using optical imaging technologies. As the solution concentration was increased, the smooth fibers were formed. In addition, different solvent ratios determined the viscosity and the surface tension of solutions. As a result, with decreased viscosity and increased surface tension, thin fibers were obtained by electrospinning. Furthermore the aligned nanofiber was successfully created by using drum collector.

키워드

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Fig. 1. Schematic diagrams of electrospinning process with (a) flat plate collector and (b) drum collector.

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Fig. 2. Snapshots of droplet shapes as observed on the nozzle tip at different voltages: (a) 6 kV, (b) 8 kV, (c) 10 kV, (d) 13 kV.

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Fig. 3. SEM images showing surface structures of PVA at different concentrations: (a) 6 wt%, (b) 9 wt%, (c) 13 wt%, (d) 25 wt%.

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Fig. 4. SEM images showing surface structures of PVDF at different concentrations (Acetone:DMAc=3:1): (a) 5 wt%, (b) 10 wt%, (c) 15 wt%.

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Fig. 5. SEM images showing surface structures of 10 wt% PVDF at different solvent ratios (Acetone:DMAc): (a) 1:1, (b) 3:1, (c) 9:1.

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Fig. 6. Comparison of surface structures made by the electrospun 12.5 wt% PEO fibers on (a) flat plate collector and (b) drum collector at a rotational speed of 2800 rpm.

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Fig. 7. Alignment of 10 wt% PEO fibers at different rotational speeds of drum collector. (a) 1500 rpm, (b) 2000 rpm.

Table 1. Electrospinning conditions.

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Table 2. Viscosities and surface tensions of various PVA solutions.

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Table 3. Viscosities and surface tensions of various PVDF solutions.

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Table 4. Viscosities and surface tensions of PVDF solutions at different solvent ratios.

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Table 5. Viscosities and surface tensions of various PEO solutions.

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