Effect of sheath flow rate ratio on mechanical properties of cellulose filament fabricated by electric field assisted flow-focusing

IF 4.9 2区工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD

Cellulose Pub Date : 2025-04-01 DOI:10.1007/s10570-025-06489-9

Yutaka Kaneko, Satoru Fukumori, Hidemasa Takana

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引用次数: 0

Abstract

Cellulose nanofibers (CNFs) are promising environmentally friendly biomass materials. The orientation of the CNFs along the single-filament axis is essential for manufacturing strong CNF-based single filaments. In this study, the effects of the electric field and the flow rate ratio between the upstream and downstream sheath flows on the material properties of CNF filaments are clarified for a double-flow-focusing channel with 45\(^\circ\) sheath flow inlets. The CNF orientation is effectively improved by applying an electric field at any sheath flow rate ratio, leading to outstanding material properties of the fabricated cellulose filament. Furthermore, biased sheath flow rate ratios can improve the material properties of the fabricated filaments. Increasing the upstream sheath flow rate compared to that of the downstream results in thinner filaments and improves the CNF orientation near the filament surface owing to the high shear rate at the interface between the CNFs core flow and sheath flow. As a result, the tensile strength and elastic modulus of the filament improves with the close packing of the CNFs inside. A higher downstream sheath flow rate is found to improve the tensile strength and toughness of the filaments. These results indicate that filaments with different mechanical properties can be selectively obtained by controlling the sheath flow rate ratio.

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鞘层流速比对电场辅助聚焦纤维素长丝力学性能的影响

纤维素纳米纤维（CNFs）是一种很有前途的环保生物质材料。cnf沿单丝轴的取向对于制造基于cnf的强单丝是必不可少的。本研究以45个\(^\circ\)鞘流入口的双聚焦通道为研究对象，研究了电场和鞘流上下游流量比对CNF细丝材料性能的影响。在任何鞘层流速比下施加电场都能有效地改善CNF的取向，从而使制备的纤维素长丝具有优异的材料性能。此外，偏置的护套流量比可以改善所制长丝的材料性能。与下游相比，增加上游的鞘层流速可以使纤维变薄，并且由于CNF芯流和鞘层流交界面处的高剪切速率，可以改善纤维表面附近的CNF取向。结果表明，纤维的抗拉强度和弹性模量随着纤维内部CNFs的紧密填充而提高。发现较高的下游护套流量可以提高长丝的拉伸强度和韧性。结果表明，通过控制护套流量比可以选择性地获得具有不同力学性能的长丝。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cellulose 工程技术-材料科学：纺织

CiteScore

10.10

自引率

10.50%

发文量

580

审稿时长

3-8 weeks

期刊介绍： Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.