Functionalization of aerogels by the use of pre-constructed monomers: the case of trifluoroacetylated (3-aminopropyl) triethoxysilane

Лермонтов, С. А.; Sipyagina, N. A.; Малкова, А. Н.; Yarkov, A. V.; Baranchikov, А. Е.; Козик, В. В.; Ivanov, V. K.

doi:10.1039/c4ra06974a

Cited by 17 publications

(6 citation statements)

References 33 publications

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“…10,11 For example, Lermontov et al acetylated amine terminated aerogels with the readily available reagent, methyl triuoroacetate. 12 The authors also synthesized a uori-nated reactive silane and employed it as a co-monomer with tetraethyl orthosilicate (TEOS) to prepare uorinated aerogels and it was determined that the method of uorine incorporation produced samples with different specic surface areas. It should be noted that a yield was not reported for the monomer that was synthesized.…”

Section: -7mentioning

confidence: 99%

Synthesis and characterization of partially fluorinated aerogels and xerogels from environmentally-compatible precursors

et al. 2017

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A new fluorocyclic silane monomer was prepared from environmentally benign and commercially available starting reagents in two, high yielding steps. The monomer was characterized by multi-nuclear NMR ( 1 H, 13 C, 19 F, and 29 Si). The monomer was used in the preparation of the first known fluorocyclic aerogels and xerogels. Due to the hydrophobic nature of the fluorocyclic monomer, a modified sol-gel synthesis was utilized in which a minimum amount of water was used. The mol% of the fluorocyclic monomer was systematically varied in both types of silica gels and the effects on the properties of the aerogels and xerogels was analyzed by scanning electron microscopy, BET surface area measurements, differential scanning calorimetry, and thermogravimetric analysis. It was determined that in both aerogels and xerogels, increasing the mol% of the fluorocyclic monomer resulted in condensed materials (i.e., pore collapse). Increased monomer concentration affected the gels thermal stability as the monomer is more susceptible to thermal decomposition than the silica gel. Pore collapse accelerates this effect as the condensed medium dissipates heat less efficiently.

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Section: -7mentioning

confidence: 99%

Synthesis and characterization of partially fluorinated aerogels and xerogels from environmentally-compatible precursors

et al. 2017

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“…According to our data, the type of SCF used in the synthesis of oxide aerogels considerably affects AG microstructure [24][25][26][27]. Thus, the specific surface area of AG based on SiO 2 , Al 2 O 3 , and ZrO 2 prepared by supercritical drying in diethyl and methyl tert-butyl ethers and in hexafluoroisopropanol is approximately twice as large as that of aerogels obtained by drying in traditionally used ethanol; their porosity is also considerably larger.…”

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confidence: 71%

SiO2–TiO2 binary aerogels: Synthesis in new supercritical fluids and study of thermal stability

Yorov

Sipyagina

Baranchikov

et al. 2016

Russ. J. Inorg. Chem.

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A comparative analysis of properties of SiO 2 -TiO 2 binary aerogels prepared by supercritical drying using different supercritical fluids (isopropanol, hexafluoroisopropanol, methyl tert-butyl ether, and CO 2 ) has been performed. The use of different supercritical fluids allows preparation of both homogeneous amorphous SiO 2 -TiO 2 binary aerogels (by supercritical drying in hexafluoroisopropanol and CO 2 ) and composite aerogels containing nanocrystalline anatase (by supercritical drying in isopropanol and methyl tert-butyl ether). The thermal treatment of the aerogels at temperatures up to 600°C does not lead to considerable change in the porous structure and phase composition of the aerogels.

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“…The choice of the solvent greatly affects the composition and microstructure of thus obtained materials [12,[15][16][17]. In vanadium oxides aerogels synthesis, V 2 O 5 Á nH 2 O wet gel is generally used as a precursor [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of vanadia aerogels with controlled V3+/V4+ ratio

et al. 2015

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Functionalization of aerogels by the use of pre-constructed monomers: the case of trifluoroacetylated (3-aminopropyl) triethoxysilane

Abstract: A novel strategy for aerogels' functionalization, based on the preliminary modification of monomers before gelation, is proposed.

Cited by 17 publications

References 33 publications

Synthesis and characterization of partially fluorinated aerogels and xerogels from environmentally-compatible precursors

Synthesis and characterization of partially fluorinated aerogels and xerogels from environmentally-compatible precursors

SiO2–TiO2 binary aerogels: Synthesis in new supercritical fluids and study of thermal stability

Facile synthesis of vanadia aerogels with controlled V3+/V4+ ratio

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