Highly elastic and robust hydroxyapatite nanowires/polyimide composite aerogel with anisotropic structure for thermal insulation

Zhu, Jingjing; Fu-xing, Zhao; Peng, Tangping; Liu, Hao; Xie, Le; Jiang, Chongwen

doi:10.1016/j.compositesb.2021.109081

Cited by 64 publications

(35 citation statements)

References 45 publications

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“…Compared with other PI composite aerogels, PI/CF (CF-10) aerogels have more prominent compressive modulus (Figure f and Table S1). ,− Moreover, this high-performance aerogel is characterized by (1) incorporation of CF without losing low-density feature; (2) simple operation without additional modifiers and cross-linking agents; (3) low cost of aerogel with promising applications. Therefore, compared with other PI composite aerogels, PI/CF has sufficient advantages from preparation to performance.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Properties of Polyimide/Carbon Fiber Aerogel and the Derivative Carbon Aerogel

Liu

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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In this study, polyimide (PI)/carbon fiber (CF) aerogel was fabricated via a freeze-drying method. The introduction of CF endows PI aerogels with good dimensional stability in the thermal imidization process. The resulting aerogel possesses excellent mechanical property (as high as 58.45 MPa) and good hydrophobic property (contact angle above 120°). The PI/CF aerogel also has very good radiation resistance, with a compressive modulus of 50.45 MPa even after 10 MGy irradiation, which is 86.53% of the initial modulus. These characteristics make the PI/CF aerogel very suitable for applications in radiation environment. Subsequently, a carbon aerogel with high temperature resistance and good mechanical properties was obtained by carbonization of the PI/CF aerogel. Its comprehensive property is comparable to traditional porous carbon-bonded carbon fiber composites.

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Section: Resultsmentioning

confidence: 99%

Fabrication and Properties of Polyimide/Carbon Fiber Aerogel and the Derivative Carbon Aerogel

Liu

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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“…44 Furthermore, the high thermal stability of HANRs embedded in the pore wall of the organic matrix prevents the combustion of the polymer and secondary ignition hazard. 39 These demonstrated that the crosslinking of boric acid and the presence of HANRs greatly improved the fire resistance of the organic aerogel.…”

Section: Thermal Performancesmentioning

confidence: 97%

“…11,34 In recent years, the synthesis of nano-hydroxyapatite and the preparation of its composite aerogel have received great attention based on the controllable structure and chemical functionality of HAP. 35−38 Abundant HAP structures (including nanocrystals, 11 nanorods, 36 and nanowires 39 ) can be obtained through different preparation methods, which endow the composites with unique functions, such as the nanosized mechanical enhancement and inhibition of gasphase heat conduction. 11,39 More importantly, Ca 2+ ions in HAP easily chelate with carboxylic acid molecules to form a layer of stable binding force, 28,40 and this natural compatibility is very suited to enhance the carboxy-rich SA aerogel.…”

Section: Introductionmentioning

confidence: 99%

“…35−38 Abundant HAP structures (including nanocrystals, 11 nanorods, 36 and nanowires 39 ) can be obtained through different preparation methods, which endow the composites with unique functions, such as the nanosized mechanical enhancement and inhibition of gasphase heat conduction. 11,39 More importantly, Ca 2+ ions in HAP easily chelate with carboxylic acid molecules to form a layer of stable binding force, 28,40 and this natural compatibility is very suited to enhance the carboxy-rich SA aerogel. Some studies have shown that the hydrogels and aerogels formed with SA and HAP have good stability, which have been successfully applied in the field of biomedicine and industrial engineering.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Insulation and Flame Retardancy of the Hydroxyapatite Nanorods/Sodium Alginate Composite Aerogel with a Double-Crosslinked Structure

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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As advanced thermal management materials, aerogels have great research value in the fields of engineering insulation, pipeline transportation, and packaging insulation. The composite interaction of the two-phase interface and the construction of a porous structure have an important impact on the thermal properties. Herein, a novel HANRs/SAB composite aerogel was prepared using sodium alginate (SA) with hydroxyapatite nanorods (HANRs), combined with boric acid crosslinking and freeze drying. In the prepared sample, the calcium ions in HANRs and SA formed the first layer of binding force and the chemical crosslinking of sodium alginate with boric acid formed the second layer of strong binding force, which effectively supported the skeleton of the aerogel and enhanced the overall mechanical properties. The modulus and maximum compressive strength of the obtained HANRs/SAB aerogel were 2.39 and 0.75 MPa, respectively, while the bulk density was 0.038–0.068 g·cm–3. Based on the prominent physical structure, the as-prepared HANRs/SAB aerogel exhibited good thermal insulation (∼35.15 mW·m–1·K–1) and outstanding flame retardant performance. Flame-retardant boric acid and high-thermal stability HANRs could effectively prevent heat transfer and organic combustion, thus resulting in an extremely low smoke gas release (11.3 m2 m–2). Therefore, the low-cost biopolymer composite aerogel based on a crosslinking strategy has broad application prospects in the field of thermal insulation and flame retardancy.

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“…For thermal insulation application, anisotropic structure can not only enhance axial heat dissipation but also effectively isolate radial heat transfer, thus decreasing the thermal conductivity in the radial direction. Zhu et al 27 synthesized an anisotropic hydroxyapatite nanowires/PI composite aerogel through the directional freezing method, which showed anisotropic thermal insulation performance with the lowest radial thermal conductivity of 0.032 W m −1 K −1 . A lightweight (7.5 kg m −3 ), anisotropic nanocomposite foam constructed by cellulose nanofibers, GO, and sepiolite nanorods was reported by Wicklein et al 28 The samples exhibited low thermal conductivity along the radial direction, high axial mechanical strength, and good flame retardance, which were highly suitable for wall insulation applications.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic and Lightweight Carbon/Graphene Composite Aerogels for Efficient Thermal Insulation and Electromagnetic Interference Shielding

Jiang

Zhao

Zhou

et al. 2022

ACS Appl. Mater. Interfaces

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High-performance and lightweight carbon aerogels (CAs) have attracted considerable attention in various fields such as electrochemistry, catalysis, adsorption, energy storage, and so on. However, finding an environmentally friendly and efficient preparation method and achieving a controllable performance of CAs are still a challenge. Herein, a series of anisotropic carbon/graphene composite aerogels were synthesized by unidirectional freezing of polyamic acid ammonium salt/graphene oxide (PAS/GO) suspension followed by lyophilization, thermal imidization, and carbonization. The prepared aerogels presented a tubular pore structure oriented along the freezing direction. The GO dispersed in the polymer matrix reinforced the skeleton of aerogels, which significantly inhibited the volume shrinkage during the preparation process, thus giving low densities of 0.074–0.185 g cm–3. In addition, the oriented pore structure endowed the composite aerogels with obviously anisotropic heat insulation performance. The radial thermal conductivity was as low as 0.038 W m–1 K–1 at the density of 0.074 g cm–3. When the initial content of GO rose to 20 phr, the resultant aerogels exhibited a high electrical conductivity of about 0.77 S cm–1 in the radial direction and the electromagnetic interference shielding effectiveness (EMI SE) reached 54.6 dB at the same time. Therefore, this study provided a facile and environmentally friendly method to prepare lightweight and anisotropic carbon aerogels.

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Highly elastic and robust hydroxyapatite nanowires/polyimide composite aerogel with anisotropic structure for thermal insulation

Cited by 64 publications

References 45 publications

Fabrication and Properties of Polyimide/Carbon Fiber Aerogel and the Derivative Carbon Aerogel

Fabrication and Properties of Polyimide/Carbon Fiber Aerogel and the Derivative Carbon Aerogel

Thermal Insulation and Flame Retardancy of the Hydroxyapatite Nanorods/Sodium Alginate Composite Aerogel with a Double-Crosslinked Structure

Anisotropic and Lightweight Carbon/Graphene Composite Aerogels for Efficient Thermal Insulation and Electromagnetic Interference Shielding

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