Flexible silica aerogel composites strengthened with aramid fibers and their thermal behavior

Zhi, Li; Gong, Lunlun; He, Song; Li, Congcong

doi:10.1016/j.matdes.2016.03.063

Cited by 125 publications

(73 citation statements)

References 26 publications

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“…The results are presented in Figure 2, 3, 4 and 5 as: (Figure 2) an SEM image of the as-received sample, (Figure 3) an EDS element map of the as-received sample, (Figure 4) an SEM image of the isothermally annealed sample, and ( Figure 5) an SEM image of the isochronally annealed sample. From the SEM pictures ( Figure 2), it can be seen that the aerogel granules are joined to the fibers, which is in good connection with the other images presented in the literature [24,26].…”

Section: Scanning Electron Microscope Resultssupporting

confidence: 85%

“…After thermal annealing at high temperatures, one cannot observe any particles on the fibers, while aerogel particles are visible on the surface of the fibers of the as-received and isothermally annealed samples. A similar effect was predicted by Li et al and Yang et al [24,26]. Iswar et al visualized similar effects with SEM after annealing the samples at 65 • C from 2 h to 24 h [5].…”

Section: Scanning Electron Microscope Resultssupporting

confidence: 81%

“…These ordinary measurements are usually completed with destructive or non-destructive structural investigations e.g., scanning electron microscopy, calorimetry, and diffraction for crystallization study. It has been well presented in previous papers [24,25] that scanning electron microscopy (SEM) combined with element mapping could illustrate essential information regarding the structures and orders of the fibers [26,27]. After annealing, an analysis of the microstructure of the samples is very important.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

et al. 2019

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Nowadays, besides the use of conventional insulations (plastic foams and wool materials), aerogels are one of the most promising thermal insulation materials. As one of the lightest solid materials available today, aerogels are manufactured through the combination of a polymer with a solvent, forming a gel. For buildings, the fiber-reinforced types are mainly used. In this paper, the changes both in the thermal performance and the material structure of the aerogel blanket are followed after thermal annealing. The samples are put under isothermal heat treatments at 70 °C for weeks, as well as at higher temperatures (up to 210 °C) for one day. The changes in the sorption properties that result from the annealing are presented. Furthermore, the changes in the thermal conductivity are followed by a Holometrix Lambda heat flow meter. The changes in the structure and surface of the material due to the heat treatment are investigated by X-ray diffraction and with scanning electron microscopy. Besides, the above-mentioned measurement results of differential scanning calorimetry experiments are also presented. As a result of using equipment from different laboratories that support each other, we found that the samples go through structural changes after undergoing thermal annealing. We manifested that the aerogel granules separate down from the glass fibers and grow up. This phenomenon might be responsible for the change in the thermal conductivity of the samples.

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Section: Scanning Electron Microscope Resultssupporting

confidence: 85%

Section: Scanning Electron Microscope Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

et al. 2019

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“…Furthermore, reflectional tests with an X-ray diffractometer (XRD) in order to find the changes in the crystal structure should be carried out. The authors presented results with XRD apparatus [17,18]. Other authors presented important information from heat-treated samples by using differential scanning calorimetry (DSC).…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal annealing on structural properties of silica aerogel super insulation material

Lakatos

Csarnovics

2019

J Therm Anal Calorim

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Nowadays, aerogel materials are some of the lightest thermal insulation materials available on the construction market; they are produced by the mixing of polymers with solvents since they create a gel. Insulated fibrous-enhanced forms are the most frequently used ones. The type, which is used for thermal insulation, is usually produced by mixing the glass fiber net with the liquid-solid solution. The present paper talks about the structural modifications caused by heat treatment of the aerogel-reinforced with fiberglass. The aerogel probes were subjected to thermal annealing, and once they got isothermal heat treatments for weeks at 70 °C, moreover, untreated samples were subjected to stepwise thermal treatments between 100 and 250 °C for 1 day. Both the heat treatments were executed in dryer equipment under atmospheric air. Changes both in the structure and in chemical bonds of the untreated and annealed samples were followed. Raman spectra have been obtained for the samples. The structural changes have an influence on the studied material as well as in thermal properties. The structural and thermal properties were put under investigation after executing heat treatments on them. Jumps in the thermal conductivity could be connected with some structural changes. Due to the annealing intensity of the peaks connected with Si-O, crystalline SiO is increased, while CH, CH2, CH3,-OH and others are decreased.

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“…Tensile strength; Three-point bending 86 nanoparticles such as silica aerogels to polymers can improve mechanical, thermal, and electrical properties of epoxy in comparison with the neat composites [10,11]. Li et.al [2] have investigated the mechanical performance and the thermal conductivity of aramid fibers reinforced with silica aerogels.…”

Section: Silica Aerogel;mentioning

confidence: 99%

Investigating the effect of silica aerogel content on the mechanical properties of epoxy resin system

Ünal¹,

Çok²,

Koç³

et al. 2019

Res. Eng. Struct. Mater.

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Flexible silica aerogel composites strengthened with aramid fibers and their thermal behavior

Cited by 125 publications

References 26 publications

Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

Influence of thermal annealing on structural properties of silica aerogel super insulation material

Investigating the effect of silica aerogel content on the mechanical properties of epoxy resin system

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