A Low-cost Preparation of SiO2 Aerogel Monoliths from Silica Sol

doi:10.15541/jim20150119

Abstract

Abstract:

Porous monolithic SiO₂ materials were prepared via ambient pressure drying process with low cost silica sol as precursor and water as solvent. Cetyl trimethyl ammonium bromide (CTAB) was used as the surface modifier to get rid of the cumbersome process of solvent substitution which was necessary in the traditional ambient drying process. The densities, specific surface area and the average pore size of the obtained SiO₂ monoliths are in the range of 150-260 mg/cm³, 91-140 m²/g and 15-27 nm, respectively. The thermal conductivity was as low as 0.048 W/(m·K) at room temperature. This method greatly reduced the preparation cost as well as the operation difficulty and risk, which will largely promote the industrial production and application of porous SiO₂materials.

Key words: porous SiO2 materials, silica hydrosol, ambient drying, the surfactant

CLC Number:

O648

ZHAO Jing-Jing, SHEN Jun, ZOU Li-Ping, WANG Wen-Qin, ZU Guo-Qing, ZHANG Zhi-Hua. A Low-cost Preparation of SiO₂ Aerogel Monoliths from Silica Sol[J]. Journal of Inorganic Materials, 2015, 30(10): 1081-1084.

Figures/Tables 7

Table 1 Starting compositions of porous SiO2 materials

Samples	Silica sol/mL	Deionized water/mL	CTAB/g	HF/mL
S2-1	10	20	0.1	0.1
S2-2	10	20	0.1	1.0
S2-3 S2-4	10 10	20 20	0.1 0.2	1.0 0.1
S3	10	30	0.2	1.0

Fig. 1 Photograph of the sample S3

Fig. 2 SEM images of sample S3 before (a, b) and after (c) heat-treatment at 600℃for 2 h

Fig. 3 N2 adsorption-desorption isotherm (a) and pore size distribution (b) of sample S3

Table 2 Physical properties of the obtained samples

Samples	Bulk density/(mg·cm^-3)	Thermal conductivity^a/(W·m^-1·K^-1)	Surface area/(m²·g^-1)	Average pore size/nm
S2-1	263	—^b	—^b	—^b
S2-2	231	0.057	91.7	15.30
S2-3 S2-4	189 241	0.052 —^b	—^b 140.9	—^b 27.67
S3	158	0.048	119.5	18.60

Fig. 4 FT-IR spectra of sample S3 after heat-treatment at 70℃, 400℃ and 600℃ for 2 h

Fig. 5 DSC/TGA curves of the sample S3 tested in air at heating rate of 10℃/min

References 9

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A Low-cost Preparation of SiO₂ Aerogel Monoliths from Silica Sol

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