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Minimizing the Diameter of Electrospun Polyacrylonitrile (PAN) Nanofibers by Design of Experiments for Electrochemical Application
Electroanalysis ( IF 3 ) Pub Date : 2018-07-18 , DOI: 10.1002/elan.201800368
Sooyoun Yu 1 , Nosang V. Myung 1
Affiliation  

An effective method to study and predict the complex mechanism of electrospinning is needed. A combination of design of experiments (DOEs) and finer tuning of the experimental parameters were used to investigate the effect of individual and interactions of solution, electrospinning, and environmental conditions on the dimensions and morphology of polyacrylonitrile (PAN) nanofibers. Analyses on DOEs determined that solution viscosity, controlled by the concentration of polymer precursor, was the predominant factor in manipulating the PAN nanofiber diameter. Similarly, reduced surface tension controlled by the addition of surfactant contributed to smoother nanofibers. An appropriate applied voltage for stable formation of Taylor cone was established. DOE on environmental conditions revealed the absolute moisture content played a significant role in causing beads. A minimum polyacrylonitrile (PAN)‐based fiber diameter of 42±7 nm was achieved with solution containing 3.25 wt. % PAN, 0.1 wt. % BYK® surfactant in N,N‐dimethylformamide (DMF). PAN nanofibers were subsequently stabilized then carbonized. BET analysis of the carbonized nanofibers showed the specific surface area increased as a function of nanofiber diameter, reaching 684 m2/g at 407 nm. Preliminary results from the electrochemical characterization of the carbon nanofibers showed the double‐layer capacitance increased with decreasing fiber diameter, showing suitable potential for electrode applications.

中文翻译:

通过设计电化学应用的实验来使电纺聚丙烯腈(PAN)纳米纤维的直径最小化

需要一种有效的方法来研究和预测电纺的复杂机理。实验设计(DOE)和实验参数的更精细调整的组合被用来研究溶液,静电纺丝和环境条件的个体和相互作用对聚丙烯腈(PAN)纳米纤维的尺寸和形态的影响。对DOE的分析确定,溶液粘度受聚合物前体浓度的控制,是控制PAN纳米纤维直径的主要因素。类似地,通过添加表面活性剂控制的降低的表面张力有助于使纳米纤维更光滑。建立适当的施加电压以稳定形成泰勒锥。DOE在环境条件下显示绝对水分含量在引起珠粒方面起着重要作用。含3.25 wt。%的溶液的最小聚丙烯腈(PAN)基纤维直径为42±7 nm。PAN含量:0.1 wt。在N,N-二甲基甲酰胺(DMF)中的%BYK®表面活性剂。PAN纳米纤维随后被稳定,然后碳化。碳化纳米纤维的BET分析表明,比表面积随纳米纤维直径的增加而增加,达到684 m2 / g在407 nm下。碳纳米纤维的电化学表征的初步结果表明,双层电容随纤维直径的减小而增加,显示出适合电极应用的潜力。
更新日期:2018-07-18
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