Hexafluoroisopropyl alcohol as a new solvent for aerogels preparation

Лермонтов, С. А.; Малкова, А. Н.; Yurkova, L. L.; Straumal, Elena A.; Gubanova, N. N.; Baranchikov, А. Е.; Smirnov, M. Yu.; Тарасов, В. П.; Бузник, В. М.; Ivanov, V. K.

doi:10.1016/j.supflu.2014.02.011

Cited by 31 publications

(12 citation statements)

References 28 publications

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“…1b, m/z = 69). This conclusion agrees well with the results presented in the work [25]. Furthermore, the corresponding data of mass spectral analysis of gaseous thermolysis products indicate the presence in the obtained materials of chemically bound acetylacetone removable at 300-400°C (m/z = 39, 43, data not given in Fig.…”

Section: Resultssupporting

confidence: 92%

“…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.…”

mentioning

confidence: 78%

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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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Section: Resultssupporting

confidence: 92%

mentioning

confidence: 78%

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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“…Furthermore, the use of PFCP based monomer 2 in the sol-gel formulations increases the thermal stability with respect to other known uorinated gels in which thermal analysis was performed. 24,25 This indicates that the use of a uorocyclic functional group versus a PFC has the potential to enhance the thermal stability of the resulting material. Fig.…”

Section: Sol-gel Characterizationmentioning

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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“…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%