THERMAL EXPANSION OF SILICA AEROGEL AT LOW TEMPERATURES

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Published: 2017-03-31

Page: 47-52


A. V. DOLBIN *

Department of Thermal Properties of Molecular Crystals, B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Nauky Ave., Kharkov, 61103, Ukraine.

M. V. KHLISTYUCK

Department of Thermal Properties of Molecular Crystals, B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Nauky Ave., Kharkov, 61103, Ukraine

V. B. ESELSON

Department of Thermal Properties of Molecular Crystals, B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Nauky Ave., Kharkov, 61103, Ukraine.

V. G. GAVRILKO

Department of Thermal Properties of Molecular Crystals, B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Nauky Ave., Kharkov, 61103, Ukraine.

N. A. VINNIKOV

Department of Thermal Properties of Molecular Crystals, B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Nauky Ave., Kharkov, 61103, Ukraine.

R. M. BASNUKAEVA

Department of Thermal Properties of Molecular Crystals, B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Nauky Ave., Kharkov, 61103, Ukraine.

F. CONCEIÇÃO

Active Aerogels, Lda., Rua Pedro Nunes, IPN Incubadora, (Edif. C), Coimbra 3030-199, Portugal.

M. OCHOA

Active Aerogels, Lda., Rua Pedro Nunes, IPN Incubadora, (Edif. C), Coimbra 3030-199, Portugal.

*Author to whom correspondence should be addressed.


Abstract

Thermal expansion of two silica aerogel samples with different densities has been investigated in the temperature range of 5–290 K. The studies were performed by using a low-temperature capacitive dilatometer. It has been found that the linear thermal expansion coefficient (LTEC) is not monotonic with maximum at the temperature range of 100–150 К. It has been suggested that such behavior is due to the peculiarities of vibrational spectrum of silicon oxide chains.

Keywords: Silica aerogel, linear thermal expansion coefficient (LTEC), vibrational spectrum


How to Cite

DOLBIN, A. V., KHLISTYUCK, M. V., ESELSON, V. B., GAVRILKO, V. G., VINNIKOV, N. A., BASNUKAEVA, R. M., CONCEIÇÃO, F., & OCHOA, M. (2017). THERMAL EXPANSION OF SILICA AEROGEL AT LOW TEMPERATURES. Journal of Applied Physical Science International, 8(1), 47–52. Retrieved from https://ikprress.org/index.php/JAPSI/article/view/2923

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