Fabrication of Uniaxially Aligned Poly(propylene) Nanofibers via Handspinning

Watanabe, Kazuhiro; Kim, Byoung‐Suhk; Enomoto, Yûji; Kim, Ick‐Soo

doi:10.1002/mame.201000408

Cited by 17 publications

(13 citation statements)

References 31 publications

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“…The conformation of polypropylene was confirmed by FT-IR spectroscopy (Figure 4), which has been well-known to be a useful method to determine molecular and chain conformation. In FT-IR spectrum, it is clearly observed that the helical conformations were produced mainly when nanofiber electrospun, while hansdpun nanofiber appeared the long stands in the trans-planar conformation [24]. These results strongly suggest that the handspinning process produces more stretched fiber than the electrospun fiber, resulting in stiffer and stronger nanofiber [24].…”

Section: Handspinningsupporting

confidence: 55%

“…Handspinning provides a number of options for polymers and solvents because their electrical properties are not relevant at all. Watanabe et al reported that the diameter and surface morphologies of handspun fiber depend on solvent systems and processing conditions to control simple mechanical force [24]. They exploit a typical polyolefins, polypropylene, to investigate the utilization of handspinning.…”

Section: Handspinningmentioning

confidence: 99%

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Mechanical Force for Fabricating Nanofiber

Lee¹,

Kharaghani²,

Kim³

2018

Novel Aspects of Nanofibers

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Nanofiber has attracted increasing attention owing to its wide applications such as filtration, drug delivery, wound dressing, separator, etc. A lot of fabrication methods are developed in the last few decades, electrospinning method is the most frequently utilized method for producing nanofiber. However, electrospinning features a use of electrical field to produce nanofiber, which have obviously high production cost and a big burden on the environment. And several limitations are observed such as orientation of fibers and limited options of polymer and solvents, so many researchers try to develop more facile and more effective method for making nanofiber. In this chapter, recent developed fabrication methods, handspinning, direct writing, touch and brush spinning, are discussed and the advantages of each methods are described, respectively. They utilize a simple mechanical force instead of electrical force, which delivers great benefits to producing nanofiber such as orientation of fibers along with the force direction, reduction of every cost, availability of various options for selecting polymer and solvents, and a facility to design a pattern with high precision. Those innovative and novel methods will enable us to make functional nanofibers more effective than traditional methods; consequently, they will broaden the application of nanofibers.

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Section: Handspinningsupporting

confidence: 55%

Section: Handspinningmentioning

confidence: 99%

Mechanical Force for Fabricating Nanofiber

Lee¹,

Kharaghani²,

Kim³

2018

Novel Aspects of Nanofibers

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show abstract

“…The important aspects that affect the strength of nanofibers are the alignment of polymer chains along the axis of the fibers and the degree of crystallinity. In our previous report11, it was found that the HS process produced more stretched fibers than the ES process. However, the degree of crystallinity was not affected critically by the spinning method, i.e., electrospinning or handspinning, due to their relatively low crystallinity.…”

Section: Resultsmentioning

confidence: 84%

“…More importantly, HS offers a number of options for polymers and solvents because, unlike in the ES process, their electrical properties are not relevant at all. In our previous report11, we found that the diameter and surface morphologies of handspun fiber depend on solvent systems and processing conditions to control simple mechanical force. Also, a significant difference in polymer chain conformation between the handspun and electrospun nanofibers was observed, and it was attributed to mechanical stretching force.…”

mentioning

confidence: 92%

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Handspinning Enabled Highly Concentrated Carbon Nanotubes with Controlled Orientation in Nanofibers

Lee

Watanabe

Kim

et al. 2016

Sci Rep

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The novel method, handspinning (HS), was invented by mimicking commonly observed methods in our daily lives. The use of HS allows us to fabricate carbon nanotube-reinforced nanofibers (CNT-reinforced nanofibers) by addressing three significant challenges: (i) the difficulty of forming nanofibers at high concentrations of CNTs, (ii) aggregation of the CNTs, and (iii) control of the orientation of the CNTs. The handspun nanofibers showed better physical properties than fibers fabricated by conventional methods, such as electrospinning. Handspun nanofibers retain a larger amount of CNTs than electrospun nanofibers, and the CNTs are easily aligned uniaxially. We attributed these improvements provided by the HS process to simple mechanical stretching force, which allows for orienting the nanofillers along with the force direction without agglomeration, leading to increased contact area between the CNTs and the polymer matrix, thereby providing enhanced interactions. HS is a simple and straightforward method as it does not require an electric field, and, hence, any kinds of polymers and solvents can be applicable. Furthermore, it is feasible to retain a large amount of various nanofillers in the fibers to enhance their physical and chemical properties. Therefore, HS provides an effective pathway to create new types of reinforced nanofibers with outstanding properties.

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Photochemically Switchable Interconnected Microcavities for All‐Organic Optical Logic Gate

Hendra

Takeuchi

Yamagishi

et al. 2021

Adv Funct Materials

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Optical microcavities confine molecular luminescence and transfer it to a far longer distance than the conventional Förster resonant energy transfer process. Such cavity‐mediated energy transfer is advantageous for use in optical circuitry. However, to realize all‐organic optical circuits, optical gate operation with organic materials is indispensable. Here, all‐organic optical gates consisting of polymer whispering gallery mode (WGM) resonators that work as the optical source, drain, and gate, which are interconnected with polymer microfiber, are demonstrated. Photoirradiation of the source sphere, as an optical input, triggers the blue fluorescence that transmits to the gate sphere through the fiber. The fiber interconnection enhances both the light confinement efficiency in the individual spheres and the light transmission efficiency between distant spheres. The gate sphere contains photoisomerizable fluorescent dye that converts, in its closed state, the blue emission into green light, which is again transmitted to the drain sphere through the fiber and lets the sphere emit red light as an output. This optical cascade is switched on and off upon photoisomerization of the dye in the gate sphere. Furthermore, an energy cascade equipped with two gate spheres works as an OR‐type logic gate, demonstrating potential utility for the future all‐organic and all‐optical integrated devices.

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Fabrication of Uniaxially Aligned Poly(propylene) Nanofibers via Handspinning

Cited by 17 publications

References 31 publications

Mechanical Force for Fabricating Nanofiber

Mechanical Force for Fabricating Nanofiber

Handspinning Enabled Highly Concentrated Carbon Nanotubes with Controlled Orientation in Nanofibers

Photochemically Switchable Interconnected Microcavities for All‐Organic Optical Logic Gate

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