Výsledky vyhledávání - "N. A. Sipyagina"

SiO2–TiO2 Binary Aerogels: A Small-Angle Scattering Study

Autor: Kh. E. Yorov, Vladimir Ivanov, N. A. Sipyagina, S. Yu. Kottsov, Vasyl Ryukhtin, Vasil M. Garamus, A. A. Pavlova, Alexander E. Baranchikov, Gennady P. Kopitsa, Sergey A. Lermontov

Publikováno v: Russian Journal of Inorganic Chemistry. 66:874-882

Structural analysis in the range of characteristic sizes from 1 nm to ~1.5 µm was performed for SiO2–TiO2 aerogels prepared in supercritical CO2, isopropanol, hexafluoroisopropanol, or methyl-tert-butyl ether using small-angle X-ray scattering and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a35a1893634f1c4ae700b42aa65c3523
https://doi.org/10.1134/s003602362106005x

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Is Supercritical So Critical? The Choice of Temperature to Synthesize SiO2 Aerogels

Autor: Gennady P. Kopitsa, Sergey A. Lermontov, Adél Len, N. A. Sipyagina, Olga S. Ivanova, A. N. Malkova, Alexander E. Baranchikov, Kh. E. Yorov, Vladimir Ivanov

Publikováno v: Russian Journal of Inorganic Chemistry. 65:255-262

The structure of SiO2-based materials obtained by hydrolysis of tetraethoxysilane and subsequent drying of SiO2 lyogels at temperatures from 85 to 265°C has been analyzed in detail. It has been found that drying conditions have no marked effect on t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::23be0848154e4592f7b2cb3e6025b3dd
https://doi.org/10.1134/s0036023620020084

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Probing the 1H spin distribution in hybrid organic-inorganic gels by multiple-quantum NMR spectroscopy

Autor: Elena A. Tatarinova, S. G. Vasil’ev, Sergey A. Lermontov, Aziz M. Muzafarov, N. A. Sipyagina, Vitaly I. Volkov

Publikováno v: Journal of Non-Crystalline Solids. 489:6-15

Multiple-quantum (MQ) NMR was used to characterize the organic phase distribution in a series of hybrid organic-inorganic gels namely methyltrimethoxysilane aerogel and QM resins (trimethylsiloxysilicate polymers) with different composition. The Gaus

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5cab937c69b3806725ce119ee1ff4129
https://doi.org/10.1016/j.jnoncrysol.2018.03.014

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Aerogels with hybrid organo-inorganic 3D network structure based on polyfluorinated diacids

Autor: N. A. Sipyagina, S. G. Vasil'ev, Alexander E. Baranchikov, Vladimir Ivanov, A. N. Malkova, Sergey A. Lermontov

Publikováno v: Journal of Fluorine Chemistry. 207:67-71

A novel type of organo-inorganic polyfluorinated aerogels is developed, based on aminopropylsilane moieties which are linked together by difluoromalonic or octafluoroadipic acid fragments. Supercritical drying was performed in isopropanol, carbon dio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5bcb74cd58f5234ffe11af45fb53a405
https://doi.org/10.1016/j.jfluchem.2018.01.006

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Comparative analysis of the physicochemical characteristics of SiO2 aerogels prepared by drying under subcritical and supercritical conditions

Autor: Kh. E. Yorov, Gennady P. Kopitsa, Vladimir Ivanov, Vitaliy Pipich, N. A. Sipyagina, Sergei A. Lermontov, A. N. Malkova, Noemi Szekely, Alexander E. Baranchikov

Publikováno v: Inorganic Materials. 53:1270-1278

SiO2-based aerogels have been produced be removing a solvent (ethanol or hexafluoroisopropanol) from lyogels both above and below the critical temperature of the alcohols (in the range 210–260 and 160–220°C, respectively). The resultant material

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6417bf6e2668fa99f2fab34d26b3e78f
https://doi.org/10.1134/s002016851712007x

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Propylene oxide as a new reagent for mixed SiO 2 -based aerogels preparation

Autor: A. N. Malkova, N. A. Sipyagina, E. A. Straumal, Sergey A. Lermontov, Vladimir Ivanov, Alexander E. Baranchikov

Publikováno v: Journal of Sol-Gel Science and Technology. 84:377-381

A two-stage technique is developed to synthesize SiO2-based aerogels using propylene oxide as a reagent. By this technique, we were able to synthesize mixed SiO2–Cr2O3 and SiO2–Yb2O3 aerogels containing 0.4–1.3% at. of the dopant.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d568862fced3611607328f8a4fb5075c
https://doi.org/10.1007/s10971-017-4429-5

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Facile synthesis of fluorinated resorcinol-formaldehyde aerogels

Autor: A. N. Malkova, Sergey A. Lermontov, E. A. Straumal, N. A. Sipyagina, Alexander E. Baranchikov, Vladimir Ivanov, Khursand E. Yorov

Publikováno v: Journal of Fluorine Chemistry. 193:1-7

In this paper, we have tried to use some unconventional solvents for the preparation of resorcinol-formaldehyde (RF) aerogels. The nature of the gelation solvent is found to greatly influence the properties of RF aerogels, e.g., to affect the specifi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a53861e058966b51d43a479bd793afaa
https://doi.org/10.1016/j.jfluchem.2016.11.001

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Chiral lactate-modified silica aerogels

Autor: Alexander E. Baranchikov, A. N. Malkova, N. A. Sipyagina, Vladimir Ivanov, Sergey A. Lermontov

Publikováno v: Microporous and Mesoporous Materials. 237:127-131

Silica-based aerogels containing L-lactic moiety were synthesized by a cogelation procedure of tetramethoxysilane (TMOS) with lactate-modified aminopropyltrimethoxysilane L-CH3CH(OH)CO–NH–(CH2)3Si(OMe)3, followed by supercritical drying (SCD). La

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2104e5cc01200c2533b30525edd33768
https://doi.org/10.1016/j.micromeso.2016.09.018

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