A New Nanoporous Aramid Fiber Aerogel

Du, Lei; Tabata, Isao; Hirogaki, Kazumasa

doi:10.2115/fiber.70.197

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…The aerogel preparation process using para -aramid was developed in our previous research. 4 We obtained an aramid aerogel having a large SSA area of 510 m 2 /g and a low density of 0.083 g/cm 3 through supercritical drying of a physical gel prepared from a fibril dispersion liquid. However, the gelation mechanism of fibril dispersion wasn't clarified and the obtained aerogel did not have enough flexibility.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Para-Aramid Aerogel Fiber through Physical Gelation of Aramid Dispersion Liquid and Supercritical Drying

Suzuki

Uchimura

Tabata

et al. 2019

AATCC Journal of Research

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Para-aramid fiber was fibrillated in a dimethyl sulfoxide (DMSO)/tetrabutylammonium fluoride (TBAF) solution at 80 °C. Physical gelation of the dispersion liquid occurred by cooling to 20 °C at varying rates of 0.5 to 2.8 °C/min. The solvent was then replaced with acetone and the gel was dried by supercritical CO2 to obtain an aerogel. The fibril diameter decreased from ∼40 nm to 20 nm using a TBAF/DMSO ratio of 1:22 to 2:11, respectively. The specific surface area (SSA) of aerogel reached 702 m2/g at a fibril diameter of 20 nm. Prepared aerogel fiber with a diameter of 536 μm had a translucent appearance, an SSA of 473 m2/g, and a low density of 0.067 g/cm3. It bent freely and repeatedly without deformation or breaking.

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Section: Introductionmentioning

confidence: 99%

Preparation of Para-Aramid Aerogel Fiber through Physical Gelation of Aramid Dispersion Liquid and Supercritical Drying

Suzuki

Uchimura

Tabata

et al. 2019

AATCC Journal of Research

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Preparation of para-aramid aerogel fiber structurally colored by light scattering through wet spinning and supercritical drying

Ajikawa,

Tabata,

Hirogaki

2023

Colloid Polym Sci

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This research is an investigation of the preparation conditions for para-aramid aerogel fibers that are structurally colored by Rayleigh scattering, an angle-independent structural color. It is well known that structural color has the angle dependence of colors. However, there is currently a desire for materials with angle-independent structural color. During the fibers’ spinning process, the microstructures of the fibers are generated. The effect of spinning conditions is investigated by measuring the optical properties of the wet gel fibers. The neutralization speed of negatively charged PPTA fibrils has a significant impact on the formation of the dense microstructure. Spinning under the fast neutralization speed condition makes it possible to achieve the blue-colored fiber derived from Rayleigh scattering. The influence of neutralization speed on the microstructure of the fibers is confirmed by FE-SEM characterization. Furthermore, spinning using a narrow inner diameter needle decreases the whiteness component derived from Mie scattering of the fibers, resulting in a more vivid blue color. The angle-independent structurally colored fibers hold great promise for application in clothing, interiors, and industrial materials.

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Preparation of Organic/Inorganic Composite Aerogel through Gelation and Supercritical Fluid Drying of Para-Aramid Fibril/Silicon Alkoxide Dispersion

et al. 2022

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A New Nanoporous Aramid Fiber Aerogel

Cited by 3 publications

References 17 publications

Preparation of Para-Aramid Aerogel Fiber through Physical Gelation of Aramid Dispersion Liquid and Supercritical Drying

Preparation of Para-Aramid Aerogel Fiber through Physical Gelation of Aramid Dispersion Liquid and Supercritical Drying

Preparation of para-aramid aerogel fiber structurally colored by light scattering through wet spinning and supercritical drying

Preparation of Organic/Inorganic Composite Aerogel through Gelation and Supercritical Fluid Drying of Para-Aramid Fibril/Silicon Alkoxide Dispersion

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