Silica Aerogel as Super Thermal and Acoustic Insulation Materials

Lu, Yan; Li, Xiaodong; Yin, X.J.; Utomo, Handojo Djati; Tao, Neng Fu; Huang, Haitao

doi:10.4236/jep.2018.94020

Cited by 19 publications

(7 citation statements)

References 26 publications

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“…35,36 Silica aerogel is a lightweight, nanostructured, and highly porous material. 37 It has a low thermal conductivity ranging from 0.015 to 0.025 W/mK 38 and ultralow density similar to that of air, 39 which is 0.00129 g/cm 3 . Therefore, it is used as a catalyst, 40 adsorbent, 41 thermal insulation, 42 and acoustic insulation.…”

Section: ■ Introductionmentioning

confidence: 99%

Optimization of the Sound Absorption Coefficient (SAC) from Cellulose–Silica Aerogel Using the Box–Behnken Design

et al. 2022

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Noise pollution, which has become a major environmental issue in urban areas, can be minimized using acoustic insulation derived from cellulose–silica aerogel. The raw materials required in the process include waste newspaper-based cellulose, geothermal silica, and NaOH/ZnO solution. Therefore, this study investigates the effect of cellulose, silica, and ZnO concentrations on optimizing the sound absorption coefficient (SAC) using the Box–Behnken design (BBD). The results showed that the optimum conditions were obtained at 39.8578 wt % cellulose, 16.5428 wt % silica, and 0.5684 wt % ZnO. The impedance test for the cellulose aerogel and cellulose–silica aerogel showed SAC values of 0.59 and 0.70, respectively, and were characterized by XRD, FTIR, BET–BJH, SEM–EDX, and TG. The results of XRD and FTIR data indicate that the product was cellulose–silica aerogel, and the SEM micrographs showed that silica particles were attached to the fiber surface. Furthermore, type IV isotherms were observed in the cellulose–silica aerogel, typical of mesoporous materials. The presence of silica strengthened the aerogel structure, improved its thermal stability, and increased the surface area but decreased its pore size.

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Section: ■ Introductionmentioning

confidence: 99%

Optimization of the Sound Absorption Coefficient (SAC) from Cellulose–Silica Aerogel Using the Box–Behnken Design

et al. 2022

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“…Aerogels are among the most well-known thermal insulation materials with low thermal conductivities owing to their high porosity [6]. Generally, the thermal conductivity of aerogels in air can be divided into several contributions related to the radiative thermal conductivity (λ r ), convective thermal conductivity (λ c ), and the conductive thermal conductivity of the solid phase (λ s ) and gas phase (λ g ).…”

Section: Resultsmentioning

confidence: 99%

“…Since aerogels were first produced in the 1930s [4], the development of such super-insulating and ultralight materials has received significant attention. In particular, aerogels composed of a ceramic backbone such as silica exhibit super heat resistance and have been developed, principally as components for thermal insulating composite materials, for use in extreme conditions [5][6][7]. Typically, silica aerogels exhibit similar three-dimensional (3D) open porous architectures with interconnected silica nanoparticles [1,8], which indeed leads to some beneficial properties such as lightweight, large surface area, fire resistance, great heat and sound insulation, etc.…”

Section: Introductionmentioning

confidence: 99%

Self-reinforcement of Light, Temperature-Resistant Silica Nanofibrous Aerogels with Tunable Mechanical Properties

Huang

Zhu

et al. 2020

Adv. Fiber Mater.

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Silica aerogels have attracted significant interest in thermal insulation applications because of their low thermal conductivity and great thermal stability, however, their fragility has limited their application in everyday products. Herein, a selfreinforcing strategy to design silica nanofibrous aerogels (SNFAs) is proposed using electrospun SiO 2 nanofibers as the matrix and a silica sol as a high-temperature nanoglue. Adopting this approach results in a strong and compatible interfacial interaction between the SiO 2 fibers and the silica sol, which results in the SNFAs exhibiting high-temperature-resistant and tunable mechanical properties from elastic to rigid. Furthermore, additional properties such as low density, high thermal insulation performance, and fire-resistance are still retained. The self-reinforcing method described herein may be extended to numerous other new ceramic aerogels that require robust mechanical properties and high-temperature resistance.

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“…Silica aerogel was fabricated from the incineration ashes by two steps; the details were described in our previous work (Lu et al 2018). The incineration ashes were received from Sembcorp Industries (Singapore).…”

Section: Methodsmentioning

confidence: 99%