Filament formation via the instability of a stretching viscous sheet: Physical mechanism, linear theory, and fiber applications

Xu, Bingrui; Li, Minhao; Wang, Feng; Johnson, Steven G.; Fink, Yoel; Deng, Daosheng

doi:10.1103/physrevfluids.4.073902

Cited by 13 publications

(16 citation statements)

References 21 publications

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“…The experimental wavelength ( exp ) is measured as the average space of Se filament arrays in SEM images of fiber cross sections. The experimental results [16,19] agree well with the theory in Fig. 5d.…”

Section: Theory Consistent With Observationsupporting

confidence: 86%

“…b Sketch for the mechanism of anisotropic instability of a stretching viscous sheet; c Anisotropic instabil-ity arising from stretching, maximum total growth rates m ∥ and m ⟂ ; d For PSU/Se/PSU, the predicted wavelength agrees with the measured experimental wavelength; e-h SEM imaging for the evolution of the transversal instability and the experimental wavelength. b-h Reprinted figures with permission from [19]. Copyright (2019) by the American Physical Society that along the transverse direction ( k ⟂ ), and the sheet thickness (H) are related by Stretching changes the perturbation growth (i.e., the instability development) along the two directions.…”

Section: Linear Theorymentioning

confidence: 99%

“…Copyright (2019) by the American Physical Society that along the transverse direction ( k ⟂ ), and the sheet thickness (H) are related by Stretching changes the perturbation growth (i.e., the instability development) along the two directions. To quantitatively evaluate this effect, a total growth rate is obtained by integrating local growth rate (k, H) [19,46]. This dispersion relation of a viscous uniform sheet sandwiched by another viscous fluid was studied [19,24].…”

Section: Linear Theorymentioning

confidence: 99%

“…To quantitatively evaluate this effect, a total growth rate is obtained by integrating local growth rate (k, H) [19,46]. This dispersion relation of a viscous uniform sheet sandwiched by another viscous fluid was studied [19,24].…”

Section: Linear Theorymentioning

confidence: 99%

“…Nevertheless, recently the capillary instabilities has been successfully utilized into post-drawing process to achieve structured particles and their assemblies for multifunctional devices [11,12,15]. Moreover, an intriguing filamentation instability of a stretching viscous sheet during thermal drawing opens new opportunities to achieve unprecedented micro/nanostructures with feasible fabrication, massive production, and versatile functionalities [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

In-Fiber Structured Particles and Filament Arrays from the Perspective of Fluid Instabilities

Xiang

et al. 2020

Adv. Fiber Mater.

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In-fiber structured particles and filament array have been recently emerging, providing unique advantages of feasible fabrication, diverse structures and sophisticated functionalities. This review will focus on the progress of this topic mainly from the perspective of fluid instabilities. By suppressing the capillary instability, the uniform layered structures down to nanometers are attained with the suitable materials selection. On the other hand, by utilizing capillary instability via post-drawing thermal treatment, the unprecedent structured particles can be designed with multimaterials for multifunctional fiber devices. Moreover, an interesting filamentation instability of a stretching viscous sheet has been identified during thermal drawing, resulting in an array of filaments. This review may inspire more future work to produce versatile devices for fiber electronics, either at a single fiber level or in large-scale fabrics and textiles, simply by manipulating and controlling fluid instabilities.

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Section: Theory Consistent With Observationsupporting

confidence: 86%

Section: Linear Theorymentioning

confidence: 99%

Section: Linear Theorymentioning

confidence: 99%

Section: Linear Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In-Fiber Structured Particles and Filament Arrays from the Perspective of Fluid Instabilities

Xiang

et al. 2020

Adv. Fiber Mater.

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Emerging Design Tools for Functional Architectures in Monofilament Fibers

Gumennik,

Faccini de Lima

2024

Adv Eng Mater

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The structural control of the monofilament fiber cross‐sectional architecture is a well‐established method for imparting its active functionality. Resulting from a thermal draw, the fiber device, until recently, is expected to be a cross‐sectionally scaled‐down and axially scaled‐up replica of its preform. However, thermal draw is a melt‐shaping process in which the preform is heated to a viscous liquid to be scaled into a fiber. Thus, it is prone to capillary instabilities on the interfaces between preform cladding and materials it encapsulates, distorting the fiber‐embedded architecture and complicating preform‐to‐fiber geometry translation. Traditionally, capillary instabilities are suppressed by performing the draw at a high‐viscosity, large‐feature‐size regime, such that the scaling of the preform into the fiber happens faster than a pronounced instability can develop. It is discovered recently that highly nonlinear, at times even chaotic capillary instabilities, in some fluid dynamic regimes, become predictable and thus engineerable. Driven by ever‐growing demand for enhancing the fiber‐device functionality, piggybacking on a capillary instability, instead of suppressing it, establishes itself as a new material processing strategy to achieve fiber‐embedded systems with user‐engineered architecture in all 3D, including the axial. Considering this development, the notable emerging methodologies are cross‐compared for designing 3D fiber‐embedded architectures.

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Recent Progress and Perspectives of Thermally Drawn Multimaterial Fiber Electronics

et al. 2019

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Fibers are the building blocks of a broad spectrum of products from textiles to composites, and waveguides to wound dressings. While ubiquitous, the capabilities of fibers have not rapidly increased compared to semiconductor chip technology, for example. Recognizing that fibers lack the composition, geometry, and feature sizes for more functions, we set out years ago to explore the boundaries of fiber functionality. Our approach focused on a particular form of fiber production, thermal-drawing from a preform. This process has been used for producing single material fibers, but by combining metals, insulators, and semiconductors all within a single strand of fiber, an entire world of functionality in fibers has emerged. Fibers with optical, electrical, acoustic, or optoelectronic functionalities can be produced at scale from relatively easy-to-assemble macroscopic preforms. Two significant opportunities now present themselves. First, can we expect that fiber functions escalate in a predictable manner, creating the context for a "Moore's Law" analogue in fibers? Second, as fabrics occupy an enormous surface around our bodies, could fabrics offer valuable service to augment the human body? Towards answering these questions, we detail the materials, performance, and limitations of thermally-drawn fibers in different electronic applications and envision their potential in new fields.

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Filament formation via the instability of a stretching viscous sheet: Physical mechanism, linear theory, and fiber applications

Cited by 13 publications

References 21 publications

In-Fiber Structured Particles and Filament Arrays from the Perspective of Fluid Instabilities

In-Fiber Structured Particles and Filament Arrays from the Perspective of Fluid Instabilities

Emerging Design Tools for Functional Architectures in Monofilament Fibers

Recent Progress and Perspectives of Thermally Drawn Multimaterial Fiber Electronics

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