Silica Aerogel: Synthesis and Applications

Gurav, Jyoti L.; Jung, In Keun; Park, Hyung Ho; Kang, Eul Son; Nadargi, Digambar Y.

doi:10.1155/2010/409310

Cited by 602 publications

(371 citation statements)

References 56 publications

(45 reference statements)

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“…There have also been reports of the silica particles tending to form a linear chain, with low crosslink density, at low pH values 41 . This is consistent with the observed formation of a small amount of needle like crystals that were filtered out, as described above.…”

Section: Figurementioning

confidence: 99%

Production of Porous Silica Microparticles by Membrane Emulsification

et al. 2011

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Section: Figurementioning

confidence: 99%

Production of Porous Silica Microparticles by Membrane Emulsification

et al. 2011

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“…Silica aerogel preparation was carried out by the sol-gel process (13,(16)(17)(18). At first, the original sol was produced by preparing a saturated solution of Na 2 SiO 3 .…”

Section: Adsorbent Preparationmentioning

confidence: 99%

Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

et al. 2018

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This study evaluated silica aerogel as an adsorbent for phenol removal from aqueous solutions. Silica aerogel was prepared through the sol-gel process and characterized by different analyses. Then, it was used for phenol removal under various conditions of operational parameters. Also, twelve isotherm parameters were employed to describe the behavior of phenol-silica aerogel adsorption system. The chemical structural analysis confirmed -OH functional groups in amorphous SiO2 and proved the adsorption of phenol onto the surface of silica aerogel. The findings of the adsorptive behavior of silica aerogel toward phenol showed increasing pH, up to 8.5, and contact time, and adsorbent dose increased the phenol removal. The removal efficiency reached over 90% when phenol concentration was below 50 mg L -1 . The reaction kinetics followed the pseudo-first order model. The isotherm study showed that equilibrium adsorption data were well-described by Freundlich and Halsey equations, among two-parameter isotherms, and Hill, Sips, and Koble-Corrigan, among three-parameter isotherms. Jovanovic and BET were the worst isotherm models for prediction of experimental equilibrium data. The maximum adsorption capacity of 75.23 mg.g -1 was calculated in phenol-silica aerogel adsorption system. The study showed silica aerogel as an efficient adsorbent to remove phenol from phenol-containing solutions.

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“…The combination of these properties in one material makes aerogels attractive in a large number of applications 1 . In a recent review article, Gurav et al describe in detail the current and potential applications of silica aerogel materials, both in scientific research and in development of industrial products 2 . For example, silica aerogels have been used as absorbents, as sensors, in lowdielectric materials, as storage media for fuels, and for a wide array of thermal insulating applications 2 .…”

Section: Introductionmentioning

confidence: 99%

Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method

Carroll

Anderson

Gorka

2014

JoVE

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A procedure for the fabrication of monolithic silica aerogels in eight hours or less via a rapid supercritical extraction process is described. The procedure requires 15-20 min of preparation time, during which a liquid precursor mixture is prepared and poured into wells of a metal mold that is placed between the platens of a hydraulic hot press, followed by several hours of processing within the hot press. The precursor solution consists of a 1.0:12.0:3.6:3.5 x 10 -3 molar ratio of tetramethylorthosilicate (TMOS):methanol:water:ammonia. In each well of the mold, a porous silica sol-gel matrix forms. As the temperature of the mold and its contents is increased, the pressure within the mold rises. After the temperature/ pressure conditions surpass the supercritical point for the solvent within the pores of the matrix (in this case, a methanol/water mixture), the supercritical fluid is released, and monolithic aerogel remains within the wells of the mold. With the mold used in this procedure, cylindrical monoliths of 2.2 cm diameter and 1.9 cm height are produced. Aerogels formed by this rapid method have comparable properties (low bulk and skeletal density, high surface area, mesoporous morphology) to those prepared by other methods that involve either additional reaction steps or solvent extractions (lengthier processes that generate more chemical waste).The rapid supercritical extraction method can also be applied to the fabrication of aerogels based on other precursor recipes. Video LinkThe video component of this article can be found at

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Silica Aerogel: Synthesis and Applications

Cited by 602 publications

References 56 publications

Production of Porous Silica Microparticles by Membrane Emulsification

Production of Porous Silica Microparticles by Membrane Emulsification

Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method

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