The effect(s) of TiO 2 nanoparticles on the vertical wicking behavior observed in electrospun polyacrylonitrile (PAN) nanofiber strings of yarn was investigated in this study. The capillary flow was measured in composite nanofiber strings of yarn by means of the image analysis of the rise of colored liquid soaked up in the strings of yarn; the height of liquid rise was determined as a function of time. The kinetics of capillary rise follows the Lucas–Washburn’s equation. The results obtained from the experimental design showed that the rate coefficient of the capillary rise was influenced by TiO 2 nanoparticles more than the twist level in nanofiber strings of yarn. For various hot-stretching ratios, the rate of capillary rise decreased with increasing the number of TiO 2 nanoparticles and the level of yarn twist. This decreasing trend was more pronounced at higher levels of yarn twist. To find how capillary behavior changed with the release of nanoparticles, the wicking mechanisms were measured at different concentrations of TiO 2 nanoparticles in capillary liquid. When TiO 2 nanoparticles were used in capillary liquid, they immediately filled the spaces between nanofibers in yarn and the liquid could not rise any more. The present study indicated that the wicking behavior of composite nanofiber strings of yarn was tunable provided that appropriate constructive factors, that is to say, the number of TiO 2 nanoparticles and the level of nanofiber yarn twist, were chosen.

中文翻译：

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通过嵌入聚丙烯腈纳米纤维纱线的氧化钛可调节芯吸行为

在这项研究中，研究了 TiO 2 纳米颗粒对在电纺聚丙烯腈 (PAN) 纳米纤维纱线中观察到的垂直芯吸行为的影响。通过对纱线中吸收的有色液体上升的图像分析，测量复合纳米纤维纱线中的毛细流动；液体上升的高度被确定为时间的函数。毛细管上升的动力学遵循 Lucas-Washburn 方程。从实验设计中获得的结果表明，毛细上升速率系数受 TiO 2 纳米粒子的影响大于纱线纳米纤维串中的捻度水平。对于不同的热拉伸比，毛细管上升率随着TiO 2 纳米粒子数量和纱线捻度水平的增加而降低。这种下降趋势在纱线捻度较高时更为明显。为了发现毛细管行为如何随着纳米颗粒的释放而变化，在毛细管液体中不同浓度的 TiO 2 纳米颗粒下测量了芯吸机制。当TiO 2 纳米颗粒用于毛细管液体时，它们立即填充了纱线中纳米纤维之间的空间，液体不能再上升。本研究表明，如果选择适当的建设性因素，即 TiO 2 纳米颗粒的数量和纳米纤维纱线捻度水平，复合纳米纤维纱线的芯吸行为是可调的。在毛细管液体中不同浓度的 TiO 2 纳米颗粒下测量芯吸机制。当TiO 2 纳米颗粒用于毛细管液体时，它们立即填充了纱线中纳米纤维之间的空间，液体不能再上升。本研究表明，如果选择适当的建设性因素，即 TiO 2 纳米颗粒的数量和纳米纤维纱线捻度水平，复合纳米纤维纱线的芯吸行为是可调的。在毛细管液体中不同浓度的 TiO 2 纳米颗粒下测量芯吸机制。当TiO 2 纳米颗粒用于毛细管液体时，它们立即填充了纱线中纳米纤维之间的空间，液体不能再上升。本研究表明，如果选择适当的建设性因素，即 TiO 2 纳米颗粒的数量和纳米纤维纱线捻度水平，复合纳米纤维纱线的芯吸行为是可调的。