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Thermal Gelation for Synthesis of Surface-Modified Silica Aerogel Powders.

ABSTRACT: A spherical silica aerogel powder with hydrophobic surfaces displaying a water contact angle of 147° was synthesized from a water glass-in-hexane emulsion through ambient pressure drying. Water glass droplets containing acetic acid and ethyl alcohol were stabilized in n-hexane with a surfactant. Gelation was performed by heating the droplets, followed by solvent exchange and surface modification using a hexamethyldisilazane (HMDS)/n-hexane solution. The pH of the silicic acid solution was crucial in obtaining a highly porous silica aerogel powder with a spherical morphology. The thermal conductivity, tapped density, pore volume, and BET surface area of the silica aerogel powder were 22.4 mW·m-1K-1, 0.07 g·cm-3, 4.64 cm3·g-1, and 989 m2·g-1, respectively. Fourier transform infrared (FT-IR) spectroscopy analysis showed that the silica granule surface was modified by Si-CH3 groups, producing a hydrophobic aerogel.

SUBMITTER: Lee KJ

PROVIDER: S-EPMC8701169 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature

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Thermal Gelation for Synthesis of Surface-Modified Silica Aerogel Powders.

Lee Kyoung-Jin KJ Lee Jae Min JM Nam Ki Sun KS Hwang Haejin H

Gels (Basel, Switzerland) 20211129 4

A spherical silica aerogel powder with hydrophobic surfaces displaying a water contact angle of 147° was synthesized from a water glass-in-hexane emulsion through ambient pressure drying. Water glass droplets containing acetic acid and ethyl alcohol were stabilized in <i>n</i>-hexane with a surfactant. Gelation was performed by heating the droplets, followed by solvent exchange and surface modification using a hexamethyldisilazane (HMDS)/<i>n</i>-hexane solution. The pH of the silicic acid solut ...[more]

PMID: 34940302

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