Design of helical groove/hollow nanofibers via tri-fluid electrospinning

Zhao, Tienan; Zheng, Yuansheng; Zhang, Xiaomin; Teng, Defang; Xu, Yewei; Zeng, Yongchun

doi:10.1016/j.matdes.2021.109705

Cited by 26 publications

(14 citation statements)

References 39 publications

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“…Related hollow or grooved core-shell nanofilaments can also be generated by tri-fluid electrospinning with the final morphology controlled by the spinneret type. 67 Combining a thermoplastic polyurethane as outer fluid (blue in Fig. 6b) with cellulose acetate as middle fluid (pink) and polyvinylpyrrolidone (PVP) as inner fluid (green) leads to grooved core-shell helical filaments when an off-center spinneret is used to hollow core-shell helical filaments using a concentric spinneret as soon as the inner PVP component is washed out with either water or ethanol.…”

Section: Chiral Polymer Nano-and Microfilamentsmentioning

confidence: 99%

Organic chiral nano- and microfilaments: types, formation, and template applications

Gowda,

Pathak,

Rohaley

et al. 2024

Mater. Horiz.

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Section: Chiral Polymer Nano-and Microfilamentsmentioning

confidence: 99%

Organic chiral nano- and microfilaments: types, formation, and template applications

Gowda,

Pathak,

Rohaley

et al. 2024

Mater. Horiz.

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“…The architectures of electrospun fibers were driven by whipping behavior of the charged jet. [34][35][36] Here, manipulation of the charge density by tailoring RH led to different whipping behavior of the jet, further achieving the creation of electrospun PS/PU fibers with various structures. We performed the whipping behavior simulations of charged fluids formed under low and high RH levels respectively to guide the direct electrospinning process (Figure 2a).…”

Section: Design and Processing Of The Curly Fibersmentioning

confidence: 99%

Ultralight and Superelastic Curly Micro/Nanofibrous Aerogels by Direct Electrospinning Enable High‐Performance Warmth Retention

Wang,

Zhu,

Wang

et al. 2023

Small

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Extremely low temperature has posed huge burden on the public safety concerns and global economics, thereby calling for high‐performance warmth retention materials to resist harsh environment. However, most present fibrous warmth retention materials are limited by their large fiber diameter and simple stacking structure, leading to heavy weight, weak mechanical property, and limited thermal insulation performance. Herein, an ultralight and mechanically robust polystyrene/polyurethane fibrous aerogel by direct electrospinning for warmth retention is reported. Manipulation of charge density and phase separation of charged jet allows for the direct assembly of fibrous aerogels consisting of interweaved curly wrinkled micro/nanofibers. The resultant curly wrinkled micro/nanofibrous aerogel possesses low density of 6.8 mg cm−3 and nearly full recovery from 1500‐cycle deformations, exhibiting both ultralight feature and superelastic property. The aerogel also shows low thermal conductivity of 24.5 mW m−1 K−1, making synthetic warmth retention materials superior to down feather possible. This work may shed light on developing versatile 3D micro/nanofibrous materials for environmental, biological, and energy applications.

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“…The demand for hollow fiber modules has constantly been rising because their advantageous area-to-volume ratio (relative to flat sheets) facilitates the optimization of process performance, and their low energy consumption contributes to a low operating cost [23,24]. Hence, hollow fibers can be used in different geometries, such as straight and helical hollow fibers [25][26][27]. According to Figure 1(b), the number of published papers discussing straight designs has been greater than that of helical fibers in the past two decades.…”

Section: Introductionmentioning

confidence: 99%

Applications of Helical Versus Straight Hollow Fiber Membranes: A Review

Zrelli¹,

Debaya²,

Doucoure³

et al. 2022

ETJ

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A comprehensive comparison was performed between helical and straight hollow fibers.  Applications of helical hollow fibers membrane were studied.  The use of helical fibers minimizes fouling and concentration polarization.  Helical configuration promotes turbulence.The production of straight and helical hollow fibers plays an important role in developing hollow fiber membrane technology that encompasses a broad range of designs. During the last two decades, scientific studies devoted to straight hollow fibers were more abundant than those focused on helical fibers. Several major applications considering side-by-side testing of these two geometries are discussed in this review. For membrane extraction, desalination, and membrane contactor processes, it is observed that permeability rates are 10%-400 % higher for helical fibers compared to straight fibers. This outcome is justified by the presence of Dean-vortices-induced flow turbulences inherent to the geometry of helical membranes. These conditions give rise to an uptake of mass and heat transfer coefficients and a reduction of temperature and concentration polarization phenomena. Aside from enhanced flow properties, helical hollow fiber bundles tend to be more robust by design, thus exhibiting better resiliency over long service operations than straight bundles. One persistent shortcoming of the helical fibers seems to be an increase in pressure drop. However, this does not always translate into a higher energy consumptioni.e., versus straight bundles. Given the performance advantage, product robustness, and adaptiveness to a broad range of applications, the adoption of helical hollow fiber technology deserves growing support from the membrane community in academic and industrial settings.

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Design of helical groove/hollow nanofibers via tri-fluid electrospinning

Cited by 26 publications

References 39 publications

Organic chiral nano- and microfilaments: types, formation, and template applications

Organic chiral nano- and microfilaments: types, formation, and template applications

Ultralight and Superelastic Curly Micro/Nanofibrous Aerogels by Direct Electrospinning Enable High‐Performance Warmth Retention

Applications of Helical Versus Straight Hollow Fiber Membranes: A Review

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