Pore structure and sorption properties of silica gels after aging in different silanes

Chunling Liu, Sridhar Komarneni

Research output: Contribution to journalArticle

Abstract

Tetramethoxysilane (TMOS) gels were synthesized and subsequently aged in various silanes, including TMOS, methyltrimethoxysilane (MTMS), and dimethyldimethoxysilane (DMDS). The surface area, pore structure and hydrophobicity were studied using nitrogen and water sorption measurements. 29Si MAS-NMR was also used for analyzing the reactions during aging. High surface areas above 1000 m2/g were obtained from the silica gels aged in TMOS and DMDS. The former has a large mesopore size of 62 angstrom and the latter has a small mesopore size of 28 angstrom. It has been found that precipitation of silane stiff layers and/or cross-linking within the pores are the primary mechanisms through which the pore structure and hydrophobicity of the gels are modified.

Original languageEnglish (US)
Pages (from-to)247-252
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume371
StatePublished - 1995

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Silanes
Silica Gel
Silica gel
silica gel
Hydrophobicity
Pore structure
silanes
sorption
Sorption
Gels
Aging of materials
hydrophobicity
porosity
gels
Nuclear magnetic resonance
Nitrogen
nitrogen
Water
nuclear magnetic resonance
water

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials

Cite this

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abstract = "Tetramethoxysilane (TMOS) gels were synthesized and subsequently aged in various silanes, including TMOS, methyltrimethoxysilane (MTMS), and dimethyldimethoxysilane (DMDS). The surface area, pore structure and hydrophobicity were studied using nitrogen and water sorption measurements. 29Si MAS-NMR was also used for analyzing the reactions during aging. High surface areas above 1000 m2/g were obtained from the silica gels aged in TMOS and DMDS. The former has a large mesopore size of 62 angstrom and the latter has a small mesopore size of 28 angstrom. It has been found that precipitation of silane stiff layers and/or cross-linking within the pores are the primary mechanisms through which the pore structure and hydrophobicity of the gels are modified.",
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AB - Tetramethoxysilane (TMOS) gels were synthesized and subsequently aged in various silanes, including TMOS, methyltrimethoxysilane (MTMS), and dimethyldimethoxysilane (DMDS). The surface area, pore structure and hydrophobicity were studied using nitrogen and water sorption measurements. 29Si MAS-NMR was also used for analyzing the reactions during aging. High surface areas above 1000 m2/g were obtained from the silica gels aged in TMOS and DMDS. The former has a large mesopore size of 62 angstrom and the latter has a small mesopore size of 28 angstrom. It has been found that precipitation of silane stiff layers and/or cross-linking within the pores are the primary mechanisms through which the pore structure and hydrophobicity of the gels are modified.

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