A lightweight aramid-based structural composite with ultralow thermal conductivity and high-impact force dissipation

Wu, Jianpeng; Wang, Yu; Zhang, Junshuo; Zhao, Chunyu; Fan, Ziyang; Shu, Quan; He, Xiaokang; Xuan, Shouhu; Gong, Xinglong

doi:10.1016/j.matt.2022.04.031

Cited by 46 publications

(32 citation statements)

References 41 publications

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“…In addition, the honeycomb structure also made some contribution to the impact toughness. In comparison to previously reported SSG‐based protective materials, [ 41,58–62 ] the 3D‐KSH with designable aerogel honeycomb had a higher value of specific impact toughness (energy absorption value up to 176 J g −1 at the strain rate of 6300 s −1 ), making it suitable for applying in energy absorbing fields (Figure 4b). Notably, although Clear Flex 75 and SSG demonstrated a comparable contrast ratio of specific impact toughness to that of 3D‐KSH, their response sensitivity (the slope of the fitted curve) was low (sensitivity factor of 1.87 × 10 −4 and 3.28 × 10 −4 for Clear Flex 75 and SSG, respectively), which would be detrimental to the performance of impact resistance when rapid response was required (Figure S25, Supporting Information).…”

Section: Resultsmentioning

confidence: 62%

“…The slight change of peak positions was due to the formation of hydrogen bonds between SSG and Kevlar nanofiber chains. [ 41 ] In addition, under uniaxial tensile condition, the SSG sandwiching between two slices of 3D‐KAH was gradually stretched into a filament, while did not disengage at the interface of 3D‐KAH and SSG, further demonstrating the SSG had excellent adhesion to Kevlar nanofibers (Figure S16 and Movie S1, Supporting Information). Thus, the SSG had the ability to conform on Kevlar nanofiber in 3D‐KAH due to the viscous fluid at lower strain rate.…”

Section: Resultsmentioning

confidence: 98%

“…Based on this, we selectively adopt the 3D-KAH skeleton walls rather than open honeycomb channels as the porous matrices to nanoconfine commercially available shear stiffening gel (SSG) due to its high impact toughness and high response sensitivity to external impact. [40,41] The resulting 3D printed Kevlar/SSG honeycomb (3D-KSH) exhibited smart and reliable impact-resistance protection under different strain rate with exceptional increase in the impact toughness up to 176 J g −1 at the strain rate of 6300 s −1 . In addition, the response sensitivity of the 3D-KSH is the highest (sensitivity factor of 4.16 × 10 −4 ) among previously reported materials with the similar toughness level.…”

Section: Introductionmentioning

confidence: 99%

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Smart Energy‐Absorbing Aerogel‐Based Honeycombs with Selectively Nanoconfined Shear‐Stiffening Gel

et al. 2023

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been explored, ranging from 1D fibers fabricated though wet-spinning or capillary-confined strategy, [18,19] 2D films obtained by blade coating or roll-to-roll processing, [20,21] to 3D monoliths prepared via template-assisted method or vacuum filtration directly. [22,23] For example, Hou and his co-authors have fabricated holey graphene aerogel fibers with highly efficient moisture capture, heat allocation, and microwave absorption performance. [24] Gong and his coauthors have reported a cellulose aerogel film as the host to load poly(dimethylsiloxane), the resulting piezoelectric nanogenerator can reliably generate outstanding piezoelectric outputs. [25] Ji and his co-authors have fabricated sphere-shaped silica aerogel monolith with precisely adjustable building block size for highly efficient laser-driven lighting. [26] Although great achievements have been obtained in materials forms made with aerogel structure by far, is it possible for scientists to extend aerogel structure into more complicated materials forms, for example, honeycomb?The hexagonal honeycomb, inspired from bee nest, is a kind of commonly used engineering material with a long-range well-ordered hexagonal porous structure, [27][28][29] endowing them with high strength-to-weight ratio, excellent shearing stiffness, exceptional energy absorption, and superior buckling resistance with the least material consumption. [30][31][32] These merits render honeycomb ideal candidate for sandwich panel, structural component, space filler, energy absorber in fields such as aerospace, automobile transportation, and construction industry. [22,[33][34][35] The conventional honeycomb skeleton wall is dense. [36] Introducing aerogel structure into honeycomb skeleton wall is an attractive pathway, which will create nanoscopic porous structure in honeycomb skeleton wall and doubtlessly provide a large amount of nanoscale confinement space for hosting various functional guests. [37][38][39] At present, investigation on aerogel honeycomb have just started. For example, Jang-Kyo Kim et al. reported a graphene honeycomb though template method, followed by further freeze-drying and thermal reduction in sequence. [22] After integrating with flexible poly(dimethylsiloxane) in the porous graphene aerogel walls with a pore size of 10−20 µm in diameter, the resulting structure can simultaneously achieve excellent electrical conductivity and stretchability. Jiang et al., fabricated cellulose aerogel honeycomb via 3D printing technique. [33] The 3D printed Aerogels, shaped as fibers, films, as well as monoliths, have demonstrated a plethora of applications in both academia and industry due to charming properties including ultralow density, large specific surface area, high porosity, etc., however studies on more complicated aerogel forms (e.g., honeycombs) with more powerful applications have not been fully explored. Herein, the Kevlar aerogel honeycomb is firstly constructed through a dry ice-assisted 3D printing method, where the Kevlar nanofiber ink is printed directly i...

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Smart Energy‐Absorbing Aerogel‐Based Honeycombs with Selectively Nanoconfined Shear‐Stiffening Gel

et al. 2023

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“…[ 22,24–30 ] f) Toughness versus density for the cement aerogel and other commercial materials. [ 20,25,31 33 ]…”

Section: Resultsmentioning

confidence: 99%

Bioinspired Super Thermal Insulating, Strong and Low Carbon Cement Aerogel for Building Envelope

Zhu

Yang

et al. 2023

Advanced Science

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The energy crisis has arisen as the most pressing concern and top priority for policymakers, with buildings accounting for over 40% of global energy consumption. Currently, single‐function envelopes cannot satisfy energy efficiency for next‐generation buildings. Designing buildings with high mechanical robustness, thermal insulation properties, and more functionalities has attracted worldwide attention. Further optimization based on bioinspired design and material efficiency improvement has been adopted as effective approaches to achieve satisfactory performance. Herein, inspired by the strong and porous cuttlefish bone, a cement aerogel through self‐assembly of calcium aluminum silicate hydrate nanoparticles (C‐A‐S‐H, a major component in cement) in a polymeric solution as a building envelop is developed. The as‐synthesized cement aerogel demonstrates ultrahigh mechanical performance in terms of stiffness (315.65 MPa) and toughness (14.68 MJ m−3). Specifically, the highly porous microstructure with multiscale pores inside the cement aerogel greatly inhibits heat transfer, therefore achieving ultralow thermal conductivity (0.025 W m−1 K−1). Additionally, the inorganic C‐A‐S‐H nanoparticles in cement aerogel form a barrier against fire for good fire retardancy (limit oxygen index, LOI ≈ 46.26%, UL94‐V0). The versatile cement aerogel featuring high mechanical robustness, remarkable thermal insulation, light weight, and fire retardancy is a promising candidate for practical building applications.

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“…Indeed, some wearable electronic devices may inevitably serve in harsh environments, such as extreme mechanical destruction, low/high temperature, or even ame stress. [26][27][28] Hence, it is practically urgent to develop conductive textiles with extreme mechanical robustness, long-term environmental stability, and even ame retardance, for applications in harsh conditions. However, few studies have reported such strong textiles previously.…”

Section: Introductionmentioning

confidence: 99%

Ultrastrong, flame-retardant, intrinsically weldable, and highly conductive metallized Kevlar fabrics

Shang

et al. 2022

J. Mater. Chem. A

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A lightweight aramid-based structural composite with ultralow thermal conductivity and high-impact force dissipation

Cited by 46 publications

References 41 publications

Smart Energy‐Absorbing Aerogel‐Based Honeycombs with Selectively Nanoconfined Shear‐Stiffening Gel

Smart Energy‐Absorbing Aerogel‐Based Honeycombs with Selectively Nanoconfined Shear‐Stiffening Gel

Bioinspired Super Thermal Insulating, Strong and Low Carbon Cement Aerogel for Building Envelope

Ultrastrong, flame-retardant, intrinsically weldable, and highly conductive metallized Kevlar fabrics

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