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Study on the Effect of Inorganic Salts on the Alignment of Electrospun Fiber

Bionic technology Lab. Study on the Effect of Inorganic Salts on the Alignment of Electrospun Fiber. Botao Song, Wenguo Cui and Jiang Chang Journal of Applied Polymer Science Vol. 122, 1047–1052 (2011). KUAS Chemical Engineering. KUAS Chemical Engineering. 4. Conclusions.

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Study on the Effect of Inorganic Salts on the Alignment of Electrospun Fiber

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  1. Bionic technology Lab Study on the Effect of Inorganic Salts on the Alignment of Electrospun Fiber Botao Song, Wenguo Cui and Jiang Chang Journal of Applied Polymer Science Vol. 122, 1047–1052 (2011) KUAS Chemical Engineering

  2. KUAS Chemical Engineering 4 Conclusions Experimental 1 5 3 2 Abstract Introduction Bionic technology Lab Outline Results and discussion

  3. KUAS Chemical Engineering Bionic technology Lab Abstract • Well-aligned and highly ordered architectures are always required in many fields, such as tissue engineering, electronics, and preparation of composite materials. • 高度有序排列的材料經常應用在組織工程、電子、複合材料領域中 • In this study, electrospun mats with well-aligned fibers and various fiber assemblies were successfully fabricated by electrospinning of poly(vinylbutyral) (PVB)/inorganic salt solution under the optimal salt condition. • 本研究在最佳PVB/無機鹽的溶液條件下，以靜電紡絲法製備出順向排列的纖維

  4. KUAS Chemical Engineering Bionic technology Lab Abstract • Then, the effect of inorganic salts on the degree of electrospun fiber alignment was comprehensively investigated, and the results indicated that the viscosity and conductivity of the solutions were the key factors influencing the degree of fiber alignment. • 然後，全面的探討無機鹽對纖維有序度的影響，結果顯示溶液的黏度與導電度為影響纖維有序度的關鍵 • It was expected that this simple and feasible method could be helpful for the fabrication of the well aligned electrospun fibers and various fiber assemblies. • 預計利用這種簡單與可行的方法可以幫助靜電紡絲收集到順向排列的纖維

  5. KUAS Chemical Engineering Bionic technology Lab Introduction 靜電紡絲 • 製備微/奈米級纖維的技術 • 該技術方便、簡單 • 可製備有機(高分子溶液 or熔融高分子) 無機(sol-gel)的纖維材料 • 電紡之纖維具有比表面積大、孔隙率高等特點

  6. KUAS Chemical Engineering Bionic technology Lab Introduction 圖1 靜電紡絲裝置示意圖

  7. KUAS Chemical Engineering Bionic technology Lab Introduction Michigan Technological University

  8. KUAS Chemical Engineering Bionic technology Lab Introduction • Electrospinning: • simple and versatile • two kinds of fiber arrangements: aligned and randomly • aligned electrospun fibers applications: • Tissue engineering • Electronics • composite materials • aligned parameter: • applied voltage • solvent composition • concentration

  9. KUAS Chemical Engineering Bionic technology Lab Introduction • Liu found: • adding LiCl→ bead-on-string structure could be prevented. [25] • Zhang found : • addition NaCl → changed fibers diameter.[19][26] • Barakat found : • addition inorganic salts (NaCl, KBr, and CaCl2) → spider-net structure. [23] • Gupta found : • addition GaCl3 → with porous structure after removal fibers salt. [24] • In this study we investigated: • effect of inorganic salt concentration • different kinds of inorganic salts on the degree of fiber alignment.

  10. KUAS Chemical Engineering Bionic technology Lab Experimental Materials: • Anhydrous ethanol (Shanghai ZhenxingChemcial No.1 Factory.) • Ca(NO3)2 •4H2O • MgCl2 • 6H2O • CaCl2 • poly(vinylbutyral) (PVB) Sinopharm Chem. Reagents

  11. KUAS Chemical Engineering Bionic technology Lab poly(vinylbutyral) (PVB) • 特性: • Strong binding(高黏性) • Optical clarity(透明) • Toughness (韌性) • Flexibility(彈性) • 應用: • 強化玻璃 • 膠合玻璃 • 防彈玻璃

  12. KUAS Chemical Engineering Bionic technology Lab Experimental Electrospinning process: Solution: • 0.001 mol for eatch salts • 0.3 g PVB • 5 mL ethanol • Voltage: 5 kV • Flow rate: 0.5 mL/h • TCD: 10cm • Needle: ? G • Collector: rotating drum (diameter = 8 cm,rotating at 750 rpm)

  13. KUAS Chemical Engineering Bionic technology Lab Results and discussion

  14. KUAS Chemical Engineering Bionic technology Lab Results and discussion 添加0.4與0.5g無機鹽的有序度與圖d差不多 再度增加鹽的添加量反而會降低纖維的有序度，其原因為溶液的黏度與導電度提高

  15. KUAS Chemical Engineering Bionic technology Lab Results and discussion 纖維的有序度與鹽的種類無關 鹽類的添加量會影響纖維的有序度 黏度與電導度都很相近

  16. KUAS Chemical Engineering Bionic technology Lab Results and discussion 因為液柱帶電量增加，會使液柱向收集器的驅動力增加(Fe)，因而穩定液柱 加入無機鹽後纖維帶的電荷增加也使液柱更穩定

  17. KUAS Chemical Engineering Bionic technology Lab Conclusions • In this study, we investigated the effect of inorganic salts on the degree of fiber alignment. • Factors influencing the fiber alignment • viscosity and conductivity of the solutions • The solution of conductivity increase • degree of fiber orientation increased

  18. KUAS Chemical Engineering Bionic technology Lab Conclusions • As the salt continued to increase • The degree of fiber alignment started to decrease • Due to the highly viscosity and conductivity of the solution. • Under the optimal spinning parameters • We successfully fabricated aligned electrospun fibers • And various aligned fiber assemblies (0o , 45 o, 60 o,90 o) • Based on the results • it was simple and feasible approach could be helpful for fabrication of the well-aligned electrospun fibers

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