Thermal Insulation Composite Prepared from Carbon Foam and Silica Aerogel Under Ambient Pressure

Liu, Heguang; Li, Tiehu; Shi, Yachun; Zhao, Xing

doi:10.1007/s11665-015-1686-8

Cited by 33 publications

(13 citation statements)

References 30 publications

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“…The thermal conductivity of CA/PAA-wrapped SF aerogel fibers was measured as 0.031 W/(m·K), which is lower than SiO 2 -based aerogels [35,36,37]. Meanwhile, the thermal conductivity of the aerogel fiber remains competitive among previous aerogel-based thermal insulation materials, including inorganic aerogels (e.g., SiO 2 -based and carbon aerogels) and organic aerogels (e.g., cellulose and SF-based aerogels) (Figure S4).…”

Section: Resultsmentioning

confidence: 99%

Continuous, Strong, Porous Silk Firoin-Based Aerogel Fibers toward Textile Thermal Insulation

et al. 2019

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Aerogel fiber, with the characteristics of ultra-low density, ultra-high porosity, and high specific surface area, is the most potential candidate for manufacturing wearable thermal insulation material. However, aerogel fibers generally show weak mechanical properties and complex preparation processes. Herein, through firstly preparing a cellulose acetate/polyacrylic acid (CA/PAA) hollow fiber using coaxial wet-spinning followed by injecting the silk fibroin (SF) solution into the hollow fiber, the CA/PAA-wrapped SF aerogel fibers toward textile thermal insulation were successfully constructed after freeze-drying. The sheath (CA/PAA hollow fiber) possesses a multiscale porous structure, including micropores (11.37 ± 4.01 μm), sub-micron pores (217.47 ± 46.16 nm), as well as nanopores on the inner (44.00 ± 21.65 nm) and outer (36.43 ± 17.55 nm) surfaces, which is crucial to the formation of a SF aerogel core. Furthermore, the porous CA/PAA-wrapped SF aerogel fibers have many advantages, such as low density (0.21 g/cm3), high porosity (86%), high strength at break (2.6 ± 0.4 MPa), as well as potential continuous and large-scale production. The delicate structure of multiscale porous sheath and ultra-low-density SF aerogel core synergistically inhibit air circulation and limit convective heat transfer. Meanwhile, the high porosity of aerogel fibers weakens heat transfer and the SF aerogel cellular walls prevent infrared radiation. The results show that the mat composed of these aerogel fibers exhibits excellent thermal insulating properties with a wide working temperature from −20 to 100 °C. Therefore, this SF-based aerogel fiber can be considered as a practical option for high performance thermal insulation.

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Section: Resultsmentioning

confidence: 99%

Continuous, Strong, Porous Silk Firoin-Based Aerogel Fibers toward Textile Thermal Insulation

et al. 2019

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“…The MCF matrix exhibits its wide acromion close to 813 cm –1 for the carbon skeletons, while SiC/MDCF possesses a peak at 802 cm –1 corresponding to the stretching mode Si–C bond, and the peak at 993 cm –1 shows the feature of the wagging mode C–H bond within SiCH 2 . However, the bands in the blue curve appearing at 1089, 1631, and 3453 cm –1 matched well with the Si–O–Si bonds, O–H bending vibration, and O–H stretching vibration of H–OH and Si–OH bonding, respectively, which further demonstrated the evolution process from MDCF to SiC/MDCF–Aerogel.…”

Section: Resultsmentioning

confidence: 84%

Novel Three-Dimensional SiC/Melamine-Derived Carbon Foam-Reinforced SiO₂ Aerogel Composite with Low Dielectric Loss and High Impedance Matching Ratio

Chen

et al. 2019

ACS Sustainable Chem. Eng.

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Novel three-dimensional SiC/melamine-derived carbon foam composite filled by silica aerogel (SiC/MDCF–Aerogel) was first fabricated by the pyrolysis process of commercial melamine foam, chemical vapor deposition of ultrathin SiC films, and the sol–gel method of silica aerogel. The results indicated that the SiC/MDCF–Aerogel composite consisted of the SiC three-dimensional open-celled network structure and the pregnant silica aerogel in the pores. Tiny cracks on the interface of skeletons and clumps were induced during the aging process, which was drastically beneficial to the microwave-absorbing properties. A minimum reflection loss could be obtained as low as −18.41 dB at the measured frequency of 16.92 GHz when the thickness of the absorber was 3.65 mm, and the reflection loss could drop below −10 dB when the selected frequencies ranged from 15.80 to 17.52 GHz, along with the thickness ranging from 2.75 to 5.0 mm, which possessed a relatively better microwave absorption performance especially at a higher frequency. Furthermore, the absorption mechanism was also investigated in detail to discuss the influence of the dielectric loss and the impedance matching ratio on the microwave-absorbing performance of SiC/MDCF–Aerogel, which provided certain scientific directions for evaluating the absorbing materials.

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“…To test their ability to be used as patches, SiO 2 -PVP hydrogels with certain transparency and mechanical properties were prepared by the sol-gel method and used as simulated skin. 22 Then the fibrous membranes were cut to cuboids and stuck on the hydrogels with the same touching area for a period of time as shown in Figure 11a. After some time, drugs encapsulated in the 17%SiO 2 -PVP membranes were transferred from the 17%SiO 2 -PVP membrane to the hydrogels by self-driving.…”

Section: In Vitro Release Of the Drug From The Membranes To The Hydro...mentioning

confidence: 99%

Drug release behaviors of flexible SiO₂‐polyvinyl pyrrolidone electrospun membranes responsive to multiple stimuli

Zhu

Zhao

Tang

et al. 2022

J of Applied Polymer Sci

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Flexible SiO 2 -polyvinyl pyrrolidone hybrid electrospun membranes were prepared using the partially hydrolyzed tetraethyl orthosilicate as cross-linking component based on electrostatic spinning. Then ibuprofen (IBU) was absorbed on the fiber membrane and blocked by grafting azobenzene groups.The target membranes' excellent flexibility, good water resistance, and acceptable mechanical properties were shown. When the content of SiO 2 was 17%, the membranes could withstand at least 50 g tensile strength. Meanwhile and the water contact angle of the membranes was close to that of the skin, which was 68.44 . Also controlled in vitro release performance of IBU under UV irradiation at 37 C and pH of 6.5 was observed. The release behavior was well fitted by Ritger-Peppas kinetic model, suggesting the diffusion release mechanism of the drug. In addition, the membranes possessed the ability to release drugs into hydrogels by self-driving. Thus, the easily prepared membranes possessed the potential to release drugs in different environments.

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Thermal Insulation Composite Prepared from Carbon Foam and Silica Aerogel Under Ambient Pressure

Cited by 33 publications

References 30 publications

Continuous, Strong, Porous Silk Firoin-Based Aerogel Fibers toward Textile Thermal Insulation

Continuous, Strong, Porous Silk Firoin-Based Aerogel Fibers toward Textile Thermal Insulation

Novel Three-Dimensional SiC/Melamine-Derived Carbon Foam-Reinforced SiO₂ Aerogel Composite with Low Dielectric Loss and High Impedance Matching Ratio

Drug release behaviors of flexible SiO₂‐polyvinyl pyrrolidone electrospun membranes responsive to multiple stimuli

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Thermal Insulation Composite Prepared from Carbon Foam and Silica Aerogel Under Ambient Pressure

Cited by 33 publications

References 30 publications

Continuous, Strong, Porous Silk Firoin-Based Aerogel Fibers toward Textile Thermal Insulation

Continuous, Strong, Porous Silk Firoin-Based Aerogel Fibers toward Textile Thermal Insulation

Novel Three-Dimensional SiC/Melamine-Derived Carbon Foam-Reinforced SiO2 Aerogel Composite with Low Dielectric Loss and High Impedance Matching Ratio

Drug release behaviors of flexible SiO2‐polyvinyl pyrrolidone electrospun membranes responsive to multiple stimuli

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Product

Resources

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Novel Three-Dimensional SiC/Melamine-Derived Carbon Foam-Reinforced SiO₂ Aerogel Composite with Low Dielectric Loss and High Impedance Matching Ratio

Drug release behaviors of flexible SiO₂‐polyvinyl pyrrolidone electrospun membranes responsive to multiple stimuli