Simple assembling process for polyimide aerogel and its application in water pollutants absorption

Kim, Jin‐Young; Kim, Gunhwi; Baek, Sehyun; Kwon, Jinuk; Kim, Seo-Yul; Kim, Yoohan; Yoo, Yunsung; Han, Haksoo

doi:10.1007/s10934-022-01215-3

Cited by 3 publications

(4 citation statements)

References 42 publications

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“…Aerogel, a three-dimensional (3D) nanoporous material is synthesized using the sol–gel method, where the wet gel undergoes a specialized drying process to replace the liquid with gas, while maintaining the integrity of the gel skeleton. , This unique microstructure imparts exceptional properties to aerogel materials, including tremendous specific surface area (500–1200 m 2 /g), high porosity (80–99.8%), low density (∼0.003 g/cm 3 ), and low thermal conductivity (0.005 W/m·K). − These attributes make aerogels highly promising for diverse applications such as catalysis, adsorption, thermal insulation, oil–water separation, and biomedicine . Over nearly a century of vigorous development, the processes for preparing aerogel materials have continuously evolved, yielding various types of aerogels (e.g., inorganic oxide aerogels, organic aerogels, carbon aerogels, biomass aerogels).…”

Section: Introductionmentioning

confidence: 99%

Polyurea–Cellulose Composite Aerogel Fibers with Superior Strength, Hydrophobicity, and Thermal Insulation via a Secondary Molding Strategy

Song,

Liu,

Zhang

et al. 2024

ACS Appl. Polym. Mater.

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Aerogel materials, considered as the "miracle material that can change the world in the 21st century", owe their transformative potential to their high specific surface area, porosity, and low density. In comparison to commercially available aerogel felt, aerogel particles, and aerogel powder, aerogel fibers not only possess the inherent advantages of aerogel materials but also exhibit exceptional flexibility and design versatility. Therefore, aerogel fibers are expected to be processed into high-performance textiles and smart wearable fabrics to further expand the application field of aerogel materials. However, the aerogel fibers suffer from poor mechanical properties and intricate, time-consuming preparation processes. Herein, a simple and efficient method for crafting polyurea−cellulose composite aerogel fibers (CAFs) with superior mechanical properties is presented. The dried bacterial cellulose (BC) matrix was immersed in a polyurea sol, and the aerogel fibers were prepared via secondary molding, followed by CO 2 supercritical drying. In a representative case, the CAFs obtained via secondary molding demonstrate outstanding hydrophobicity with a contact angle of 126°, along with remarkable flexibility. Significantly, the CAFs exhibit excellent mechanical properties, including a tensile strength of 6.4 MPa. Moreover, the CAFs demonstrate superior thermal insulation capabilities, withstanding temperatures ranging from 180 to −40 °C. In conclusion, with the successful fabrication of polyurea−cellulose CAFs, this study introduces a magic approach for producing aerogel fibers endowed with exceptional mechanical properties and thermal insulation. This advancement contributes to the development and application of aerogel materials in various fields.

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Section: Introductionmentioning

confidence: 99%

Polyurea–Cellulose Composite Aerogel Fibers with Superior Strength, Hydrophobicity, and Thermal Insulation via a Secondary Molding Strategy

Song,

Liu,

Zhang

et al. 2024

ACS Appl. Polym. Mater.

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“…4,5 Even if the fabrication process for PI is expensive and needs a tedious process compared to silica aerogel, these unique properties, combined with high absorption ability in recycling and filtration, make PI incredible to be used in different applications. 6 Polyimide aerogels are synthesized by mixing dianhydrides with amines 7−9 or isocyanates 10−12 in the form of monolith or film. 13,14 Recently, strong evidence has emerged that reducing the dimensions of the materials from a few millimeters to a micrometer or even a few nanometers gives rise to many unique properties in these materials.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Aerogels are solid materials with the lowest density and various beneficial properties that make them suitable for a broad range of applications. Polyimide (PI) aerogels have attracted an exceptionally high level of attention due to their highly porous structures, low density, high thermal stability, excellent mechanical properties, low dielectric contents, and low thermal conductivity. − These properties render PI aerogels ideal candidates for thermal insulation under vigorous conditions. , Even if the fabrication process for PI is expensive and needs a tedious process compared to silica aerogel, these unique properties, combined with high absorption ability in recycling and filtration, make PI incredible to be used in different applications …”

Section: Introductionmentioning

confidence: 99%

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Macroporous Polyimide Aerogels: A Comparison between Powder Microparticles Synthesized via Wet Gel Grinding and Emulsion Processes

2023

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It is noteworthy to mention that synthesizing the polyimide aerogel powder, which is carried out in this study, benefits from two advantages: (i) the powder particles can be used for some specific applications where the monolith is not suitable and (ii) there is a possibility to investigate how a polyimide aerogel monolith can be made through the polyimide powder to reduce its cost and cycle time. In this study, two straightforward methods, wet gel grinding and emulsion, are introduced to prepare polyimide aerogel powders using ambient pressure drying. The microscopic properties of interest, including skeletal and porous structures, microparticle size and assembly, combined with macroscopic properties such as thermal stabilities and conductivities (0.039 W/m·K), confirm that the fabricated microparticles with a size in the range of 7–20 μm and porosity in the range of 65–85% are thermally stable up to 500 °C.

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Superhydrophobic polyimide/cattail-derived active carbon composite aerogels for effective oil/water separation

Wang

Zeng

Wang

et al. 2023

Separation and Purification Technology

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Simple assembling process for polyimide aerogel and its application in water pollutants absorption

Cited by 3 publications

References 42 publications

Polyurea–Cellulose Composite Aerogel Fibers with Superior Strength, Hydrophobicity, and Thermal Insulation via a Secondary Molding Strategy

Polyurea–Cellulose Composite Aerogel Fibers with Superior Strength, Hydrophobicity, and Thermal Insulation via a Secondary Molding Strategy

Macroporous Polyimide Aerogels: A Comparison between Powder Microparticles Synthesized via Wet Gel Grinding and Emulsion Processes

Superhydrophobic polyimide/cattail-derived active carbon composite aerogels for effective oil/water separation

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