微流控纺丝中凝胶速率对螺旋纤维形貌的调控机制

doi:10.11949/0438-1157.20220900

化工学报 ›› 2022, Vol. 73 ›› Issue (11): 5158-5166.DOI: 10.11949/0438-1157.20220900

• 材料化学工程与纳米技术 • 上一篇下一篇

微流控纺丝中凝胶速率对螺旋纤维形貌的调控机制

王之豪¹(), 宋欣¹, 殷亚然¹^,²(), 张先明¹^,²

^1.浙江理工大学材料科学与工程学院，“纺织纤维材料与加工技术”国家地方联合工程研究中心，浙江杭州 310018
^2.浙江理工大学绍兴柯桥研究院有限公司，浙江绍兴 312030

收稿日期:2022-06-27 修回日期:2022-09-15 出版日期:2022-11-05 发布日期:2022-12-06
通讯作者: 殷亚然
作者简介:王之豪(1996—)，男，硕士研究生，wzh852@126.com
基金资助:
浙江省自然科学基金项目(LQ21B060009);国家自然科学基金项目(22008220);浙江省重点研发计划资助项目(2020C01143);浙江理工大学科研启动基金项目(19012403-Y)

Regulation of gelation rate on the morphology of helical fibers during microfluidic spinning

Zhihao WANG¹(), Xin SONG¹, Yaran YIN¹^,²(), Xianming ZHANG¹^,²

^1.School of Materials Science and Engineering, Zhejiang Sci-Tech University, National & Local Joint Engineering Research Center for Textile Fiber Materials and Processing Technology, Hangzhou 310018, Zhejiang, China
^2.Zhejiang Sci-Tech University Shaoxing-Keqiao Research Institute, Shaoxing 312030, Zhejiang, China

Received:2022-06-27 Revised:2022-09-15 Online:2022-11-05 Published:2022-12-06
Contact: Yaran YIN

摘要/Abstract

摘要：

微流控纺丝技术制备海藻纤维已在诸多领域得到认可，但快速凝胶反应限制了螺旋纤维形貌的灵活调控。鉴于此，采用同轴环管毛细管微流控装置制备海藻纤维，外相为氯化钙溶液，内相为海藻酸钠溶液，通过添加柠檬酸钠降低凝胶反应速率，并系统考察了凝胶速率和内外相流量对纤维分布和螺旋形貌的影响。结果表明，凝胶速率降低有利于螺旋纤维形成，并影响直线、螺旋、波浪和堵塞等纤维分布。实验发现粗细两种螺旋纤维，其形貌特性与凝胶速率和两相流量的关系存在显著差异。经比较，粗螺旋直径和螺距、细螺旋振幅对凝胶速率和两相流量的影响更为敏感。凝胶速率和剪切力分别是调控粗、细螺旋螺距的主导因素，利用螺距与内外流量比可很好划分两种螺旋纤维。

关键词: 微流体学, 凝胶, 形态学, 海藻酸钠, 螺旋纤维, 形貌调控

Abstract:

The preparation of alginate fibers by microfluidic spinning has been recognized in many fields, but the fast gelation reaction limits the flexible regulation of the helical fiber morphology. Regarding this, a series of alginate fibers were prepared in a coaxial capillary microfluidic device. The outer phase was the calcium chloride solution, and the inner phase adopted the mixed aqueous solution of sodium alginate with sodium citrate to reduce the gelation rate. The effects of gelation rate and flow rates of inner and outer phases on the fiber distribution and helical morphology were systematically investigated. The result indicates that the reduction of gelation rate favors the formation of helical fibers and affects the distribution of fibers such as straight, helical, wavy, and blocked. Furthermore, two types of helical fibers, namely thick and thin helical fibers, are recognized. Their morphological characteristics show significant differences in relation to the gelation rate and two-phase flow rates. By comparison, the diameter and pitch of thick helix, and the amplitude of thin helix are more vulnerable to the gelation rate and two-phase flow rates. The gelation rate and shear force are the dominant factors regulating the pitch of thick and thin fibers, respectively. On this basis, the two helical fibers can be well distinguished by the relation of pitch and the inner/outer rate ratio.

Key words: microfluidics, gels, morphology, sodium alginate, helical fiber, morphology regulation

中图分类号:

TQ 342

王之豪, 宋欣, 殷亚然, 张先明. 微流控纺丝中凝胶速率对螺旋纤维形貌的调控机制[J]. 化工学报, 2022, 73(11): 5158-5166.

Zhihao WANG, Xin SONG, Yaran YIN, Xianming ZHANG. Regulation of gelation rate on the morphology of helical fibers during microfluidic spinning[J]. CIESC Journal, 2022, 73(11): 5158-5166.

图/表 9

图1 微流控装置系统示意图

Fig.1 Schematic diagram of the microfluidic device

图2 毛细管微通道内典型纤维形貌照片

Fig.2 The typical morphologies of fibers in the capillary microchannel

图3 纤维形态分布

Fig.3 The distribution map of fiber morphologies

图4 螺旋纤维形成机理示意图

Fig.4 Schematic diagram of formation mechanism of helical fiber

图5 内相流体黏度随剪切速率的演变

Fig.5 The evolution of the viscosity of inner fluid with the shear velocity

图6 柠檬酸钠浓度对螺旋纤维直径的影响(空心图标为粗螺旋，实心图标为细螺旋)

Fig.6 Effect of sodium citrate concentration on the diameter of helical fibers (hollow icons represent thick helical fibers, solid icons represent thin helical fibers)

图7 柠檬酸钠浓度对初始变形距离的影响(空心图标为粗螺旋，实心图标为细螺旋)

Fig.7 Effect of sodium citrate concentration on the initial deformation distance(hollow icons represent thick helical fibers, solid icons represent thin helical fibers)

图8 柠檬酸钠浓度对螺旋纤维螺距的影响(空心图标为粗螺旋，实心图标为细螺旋)

Fig.8 Effect of sodium citrate concentration on the pitch of helical fibers(hollow icons represent thick helical fibers, solid icons represent thin helical fibers)

图9 柠檬酸钠浓度对螺旋纤维振幅的影响(空心图标为粗螺旋，实心图标为细螺旋)

Fig.9 Effect of sodium citrate concentration on the amplitude of helical fibers(hollow icons represent thick helical fibers, solid icons represent thin helical fibers)

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微流控纺丝中凝胶速率对螺旋纤维形貌的调控机制

Regulation of gelation rate on the morphology of helical fibers during microfluidic spinning

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