The synthesis of silica-based aerogel from gold mine waste for thermal insulation

Mermer, Nevin Karamahmut; Yılmaz, Müge Sarı; Özdemir, Özgül Dere; Pişkin, Mehmet Burçin

doi:10.1007/s10973-017-6371-8

Cited by 14 publications

(1 citation statement)

References 33 publications

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“…With increasing FA content from 3.0 to 5.0 wt.%, the porosity of FA aerogels decreases causing the efficiency of gas-phase conduction to decrease, and thus, their thermal conductivity increases from 0.040 to 0.047 W/m.K. Moreover, the thermal conductivity of our FA aerogels is comparable to some commercial insulation materials such as mineral wool (0.030 -0.040 W/m.K), fiberglass (0.033 -0.044 W/m.K), expanded polystyrene (0.030 -0.040 W/m.K) and other silica aerogels from gold mine (above 0.2 W/m.K), coal gangue (0.026 W/m.K), and dislodged sludge (0.030 -0.087 W/m.K) [11][12][13][14] . It can be claimed that the aerogels from FA are a promising candidate for practical heat insulation applications.…”

Section: Thermal Insulation Of Fa Aerogelsmentioning

confidence: 99%

Advanced Fabrication of Lightweight Aerogels from Fly Ash for Thermal Insulation

Nguyen

Tran

Doan

et al. 2021

Sci. Tech. Dev. J.- Eng. Tech.

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For the first time, an environmentally friendly and effective procedure to produce high-value engineering aerogels from fly ash (FA) has been developed by dispersing FA particles into a mixture of biodegradable polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC), followed by freezedrying. The effect of FA content on the physical properties, morphology, mechanical strength, and thermal conductivity of FA aerogels is also studied comprehensively. The lightweight FA aerogels show a low density of 0.072 – 0.093 g/cm3 with high porosity of 94.94 – 95.78%. The morphology of aerogels shows the uniform distribution of FA particles in PVA-CMC matrixes that creates a porous structure with a pore size of 2-5 mm. Therefore, the FA aerogels exhibit good heat insulation with extremely low thermal conductivity of 0.040 – 0.047 W/m.K at ambient temperature and pressure that is comparable to some commercial insulation materials such as mineral wool, fiberglass, expanded polystyrene, and other silica-based aerogels from waste. Moreover, the compressive modulus of FA aerogels is about 67.73 – 254.75 kPa indicating their excellent mechanical properties under 1 kN vertical compression. The experimental results indicate the significant better durability of FA aerogels than that of previous aerogels from other wastes such as sugarcane bagasse (88 kPa), pineapple leaf fibers (1.64 – 5.34 kPa), recycled polyethylene terephthalate (1.16 – 2.87 kPa), spent coffee grounds (5.41 – 15.62 kPa), and silica – cellulose (86 – 169 kPa). It is concluded that FA aerogels are a promising candidate as a lightweight thermal insulating material.

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Section: Thermal Insulation Of Fa Aerogelsmentioning

confidence: 99%