Physico-chemical properties of silica aerogels prepared from TMOS/MTMS mixtures

Ingale, S. V.; Wagh, P. B.; Tripathi, A. K.; Kamble, V.S.; Kumar, Ratanesh; Gupta, Satish C.

doi:10.1007/s10934-010-9410-4

Cited by 20 publications

(9 citation statements)

References 10 publications

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“…The absorption bands at around 1100 cm À1 correspond to asymmetric stretching vibrations of the SieOeSi bond whereas the bands at 472 cm À1 correspond to bending vibrations of the SieOeSi bonds. These absorption bands observed in all the samples are characteristic of silica [16]. The band around 3453 cm À1 and 1631 cm À1 represents bending vibrations of eOH of adsorbed and coordinately bound water molecules to the hydroxyl groups present on the surface of silica matrix.…”

Section: Characterizationmentioning

confidence: 81%

Synthesis and micro structural investigations of titania–silica nano composite aerogels

Ingale¹,

Sastry²,

Wagh³

et al. 2012

Materials Chemistry and Physics

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Section: Characterizationmentioning

confidence: 81%

Synthesis and micro structural investigations of titania–silica nano composite aerogels

Ingale¹,

Sastry²,

Wagh³

et al. 2012

Materials Chemistry and Physics

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“…Silica aerogel is a kind of promising materials for thermal insulation due to its extremely low thermal conductivity (~0.04 W/(m∙K)) originated from low density (<0.1 g/cm 3 ), high porosity (~99%), and adjustable nanoporous structure, together with its strong resistance to burning [ 1 , 2 , 3 , 4 , 5 ]. Generally, silica aerogel is produced by a sol-gel technique with silicon alkoxides, such as tetraethoxysilane (TEOS) [ 6 , 7 ] or tetramethoxysilane (TMOS) [ 8 , 9 ] as precursors. Recently, sodium silicate [ 10 , 11 , 12 ] or solid wastes such as oil shale ash [ 13 ], fly ash [ 14 ], bagasse ash [ 15 ], and rice husk ash [ 16 ] have also been used as raw materials to prepare silica aerogels.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Silica Aerogels by Ambient Pressure Drying without Causing Equipment Corrosion

et al. 2018

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The silica aerogels were prepared via a sol-gel technique and ambient pressure drying by using industrial solid wastes, dislodged sludges, as raw materials. A strategy was put forward to reduce the corrosion of equipment during the drying procedure. The pore structure, hydrophobicity, and thermal insulation property of the obtained samples were investigated in detail. The results show that the corrosion can be effectively avoided by using an equimolar mixture of trimethylchlorosilane (TMCS) and hexamethyldisilazane (HMDS) as silylation agents. At a Si:TMCS:HMDS molar ratio of 1:0.375:0.375, the silica aerogels possess a desirable pore structure with a pore volume of 3.3 ± 0.1 cm3/g and a most probable pore size of 18.5 nm, a high hydrophobicity with a water contact angle of 144.2 ± 1.1°, and a low thermal conductivity of 0.031 ± 0.001 W/(m∙K).

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“…2). 5,7,10,18,26,27 A set of aerogel films was thermally treated after deposition to study the effects of this process on the thermal properties of the films. First, an optimization was performed to determine the optimal temperature for the thermal treatment.…”

Section: Resultsmentioning

confidence: 99%

“…These groups make the aerogels hydrophobic and, thus, prevent their collapse upon drying. As the TMOS v/v% is increased, the Si-CH3 contributions at 790 cm 1 (rocking mode) and 1275 cm 1 (symmetrical deformation mode) decrease 26,28,29 and films become more hydrophilic. 5,10 An analogous effect is observed with TEOS precursor (Fig.…”

Section: Resultsmentioning

confidence: 99%

Thermal properties of methyltrimethoxysilane aerogel thin films

et al. 2016

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Aerogels are light and porous solids whose properties, largely determined by their nanostructure, are useful in a wide range of applications, e.g., thermal insulation. In this work, as-deposited and thermally treated air-filled silica aerogel thin films synthesized using the sol-gel method were studied for their thermal properties using the 3-omega technique, at ambient conditions. The thermal conductivity and diffusivity were found to increase as the porosity of the aerogel decreased. Thermally treated films show a clear reduction in thermal conductivity compared with that of as-deposited films, likely due to an increase of porosity. The smallest thermal conductivity and diffusivity found for our aerogels were 0.019 W m−1 K−1 and 9.8 × 10-9 m2 s−1. A model was used to identify the components (solid, gaseous and radiative) of the total thermal conductivity of the aerogel.

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Physico-chemical properties of silica aerogels prepared from TMOS/MTMS mixtures

Cited by 20 publications

References 10 publications

Synthesis and micro structural investigations of titania–silica nano composite aerogels

Synthesis and micro structural investigations of titania–silica nano composite aerogels

Preparation of Silica Aerogels by Ambient Pressure Drying without Causing Equipment Corrosion

Thermal properties of methyltrimethoxysilane aerogel thin films

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