Engineering thermal and mechanical properties of flexible fiber-reinforced aerogel composites

Liao, Yundan; Wu, Huijun; Ding, Yong; Yin, Shuo; Wang, Moran; Cao, Amin

doi:10.1007/s10971-012-2806-7

Cited by 84 publications

(39 citation statements)

References 23 publications

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“…The as-obtained fiber/silica gels were surface modified and dried at ambient pressure in order to prepare the silica fiber/aerogel composites. Detailed descriptions of the preparation procedures can be found in Liao et al (2012) and Wu et al (2014). Figure 2(b) shows a scanning electron microscope (SEM) image of the silica aerogel.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…However, the weak strength and high transparency of aerogels at a wavelength of 3-8 µm limit their application in thermal insulation (Baetens et al, 2011;Zeng et al, 1995b). Reinforced fibers have recently been added to the aerogel matrix, both to improve the strength and to reduce the radiative transfer, because the fibers have tremendous scattering or absorption, especially at a wavelength of 3-8 µm (Liao et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Thermal Conductivity of Fiber/Aerogel Composites for Optimal Thermal Insulation

Yang

Wu²,

He³

et al. 2015

J Por Media

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A numerical model for predicting the effective thermal conductivity of fused silica fiber/aerogel composites by simultaneously considering the effects of the fiber volume fraction and fiber diameter is presented. The predicted effective thermal conductivity of the fiber/aerogel composites agreed well with the existing measured and predicted results. The effects of the volume fraction (0-25%) and diameter (0.3-10 µm) of fibers on the effective thermal conductivity of aerogel composites were investigated under a large range of temperatures (300-1300 K). The results indicated that the minimum effective thermal conductivity of the fiber/aerogel composites by simultaneously considering the optimized fiber volume fraction and diameter was significantly lower than when individually considering the optimized fiber volume fraction and diameter values. For instance, the minimum effective thermal conductivity by simultaneous optimization was 0.0262 W/m −1 K −1 at 1000 K, which was much lower than 0.0327 W/m −1 K −1 by individually optimizing the fiber volume fraction at a diameter of 8 µm and 0.0532 W/m −1 K −1 by individually optimizing the fiber diameter at a volume fraction of 3%. Moreover, the quantitative relations between the minimum effective thermal conductivity of the fiber/aerogel composites and the temperatures are presented, with the aim of identifying the optimal thermal insulation for applications in aeronautics and astronautics, construction, and other industrial fields.

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Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of Thermal Conductivity of Fiber/Aerogel Composites for Optimal Thermal Insulation

Yang

Wu²,

He³

et al. 2015

J Por Media

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“…In the last decade, researchers have attempted to improve the mechanical properties and increase the fracture energy of the aerogels . Generally, there are some methods to solve this problem such as modification of the aerogels by rubbers, reinforcement of the aerogels by fibers, tuning the synthetic parameters and crosslinking of the aerogels by epoxy, polystyrene, and isocyanates . Hajizade et al .…”

Section: Introductionmentioning

confidence: 99%

Mechanical and thermal insulation properties of isocyanate crosslinked resorcinol formaldehyde aerogel: Effect of isocyanate structure

Aghabararpour

Mohsenpour

Motahari

et al. 2019

J of Applied Polymer Sci

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In this article, the mechanical and thermal properties of resorcinol formaldehyde (RF) aerogels were improved using two different crosslinkers including hexamethylene diisocyanate (HDI) and methylene diphenyl diisocyanate (MDI). The crosslinking was performed after the aerogel drying process, with two concentrations of crosslinking agent. The formation of urethane linkages was investigated by Fourier transform infrared spectroscopy. The effect of crosslinking process and crosslinking agent type on the mechanical properties was analyzed by compression, bending, and impact tests. The improvement of mechanical strength was attributed to the neck thickness, which was studied by atomic force microscopic test. The results revealed that a higher improvement was obtained by increasing the crosslinking agent value. HDI crosslinked aerogel represented the highest strain-at-break and MDI-reinforced sample showed the highest strength. By crosslinking, the samples density was increased <59% and the reduced compressive strength was enhanced upto eight times. The effect of crosslinking on the thermal conductivity was explored. The increment of neck size and density enhanced the solid conductivity and, consequently, raised the thermal conductivity.

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“…Aerogels have been applied in many fields due to their unique structure [1]. Among aerogels, silica aerogel has attracted enormous attention owing to its high surface area and high porosity formed by nonmetal particles [2]. Since the pore sizes of silica aerogel are distributed from 2 to 50 nm, which is smaller than the mean free path of nitrogen and oxygen, the thermal conductivity caused by either the gas or the convection is very small [3].…”

Section: Introductionmentioning

confidence: 99%

“…Among various methods, fibres are often employed as reinforcement phase to strengthen the mechanical performance of the base material [1,[5][6][7][8][9][10][11][12]. Wu et al proposed a possible way to control the thermal and mechanical properties of fibrereinforced aerogels composites by regulating the fibre alignments and the laminated structures [2,4]. Further, Takayuki et al [13] synthesized porous ceramic material using a freeze-drying process, showing that the pores aligned along the macroscopic direction of ice for-mation and acted as channels.…”

Section: Introductionmentioning

confidence: 99%

Preparation of SiO2 nanocomposites with aligned distributing glass fibre using freeze-drying process

Zhang

Luo

et al. 2017

PAC

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The glass fibre reinforced nano-SiO 2 composites (with up to 40 wt.% of glass fibres) as insulating materials were fabricated firstly by preparing aligned glass fibres under the ice formation followed by pressing and annealing. Scanning electron microscopy analyses confirmed the presence of parallel distribution of glass fibres in certain direction. The low-temperature nitrogen adsorption and mercury intrusion measurements showed that the composites have mesoporous structure with the mean pore size less than 20 nm. Further, it was found that the compressive strength and thermal conductivity of composite were 15.1 MPa and 0.0585 W/(m·K), respectively.

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Engineering thermal and mechanical properties of flexible fiber-reinforced aerogel composites

Cited by 84 publications

References 23 publications

Prediction of Thermal Conductivity of Fiber/Aerogel Composites for Optimal Thermal Insulation

Prediction of Thermal Conductivity of Fiber/Aerogel Composites for Optimal Thermal Insulation

Mechanical and thermal insulation properties of isocyanate crosslinked resorcinol formaldehyde aerogel: Effect of isocyanate structure

Preparation of SiO2 nanocomposites with aligned distributing glass fibre using freeze-drying process

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