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Dielectric properties of liquid crystals in polycapillary matrices / B. A. Belyaev [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 6. - P. 1315-1322, DOI 10.1134/S1063783410060314. - Cited References: 24. - This study was supported by the Council on Grants from the President of the Russian Federation (grant no. 3818.2008.3) and the Siberian Branch of the Russian Academy of Sciences (Integration Project no. 5) and performed within the framework of the State Contract (no. 02.740.11.0220). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MOLECULAR-SIEVES
   SILICA AEROGEL
   POROUS-GLASS
   MEMBRANES
   NMR
   8CB
Аннотация: This paper reports on the results of investigations into the dielectric properties of liquid crystals embedded in polycapillary matrices and describes a technique for their measurement. It has been revealed that the chemical structure of the rigid core and the length of mobile alkyl groups of liquid-crystal molecules of the alkylcyanobiphenyl group substantially affect the equilibrium configuration of the liquid-crystal director in capillaries. The reorientation of liquid-crystal molecules embedded in capillaries in the nematic phase under the influence of an external magnetic field has been investigated.

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Держатели документа:
[Belyaev, B. A.
Drokin, N. A.
Shabanov, V. F.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Kumakhov, M. A.] Inst Xray Opt, Moscow 125315, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Institute of X-Ray Optics, ul. Chasovaya 28, Moscow 125315, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Drokin, N. A.; Дрокин, Николай Александрович; Kumakhov, M. A.; Shabanov, V. F.; Шабанов, Василий Филиппович
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Fedorov, A. S.
Thermal properties of porous silicon nanomaterials / A. S. Fedorov, A. S. Teplinskaia // Materials. - 2022. - Vol. 15, Is. 23. - Ст. 8678, DOI 10.3390/ma15238678. - Cited References: 50. - This study was funded by the Ministry of Science and High Education of Russian Federation, project no. FSRZ-2020-0008 . - ISSN 1996-1944
Кл.слова (ненормированные):
porous silicon -- aerogel -- thermal properties -- heat capacity -- molecular dynamics
Аннотация: The thermal properties, including the heat capacity, thermal conductivity, effusivity, diffusivity, and phonon density of states of silicon-based nanomaterials are analyzed using a molecular dynamics calculation. These quantities are calculated in more detail for bulk silicon, porous silicon, and a silicon aerocrystal (aerogel), including the passivation of the porous internal surfaces with hydrogen, hydroxide, and oxygen ions. It is found that the heat capacity of these materials increases monotonically by up to 30% with an increase in the area of the porous inner surface and upon its passivation with these ions. This phenomenon is explained by a shift of the phonon density of states of the materials under study to the low-frequency region. In addition, it is shown that the thermal conductivity of the investigated materials depends on the degree of their porosity and can be changed significantly upon the passivation of their inner surface with different ions. It is demonstrated that, in the various simulated types of porous silicon, the thermal conductivity changes by 1–2 orders of magnitude compared with the value for bulk silicon. At the same time, it is found that the nature of the passivation of the internal nanosilicon surfaces affects the thermal conductivity. For example, the passivation of the surfaces with hydrogen does not significantly change this parameter, whereas a passivation with oxygen ions reduces it by a factor of two on average, and passivation with hydroxyl ions increases the thermal conductivity by a factor of 2–3. Similar trends are observed for the thermal effusivities and diffusivities of all the types of nanoporous silicon under passivation, but, in that case, the changes are weaker (by a factor of 1.5–2). The ways of tuning the thermal properties of the new nanostructured materials are outlined, which is important for their application.

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Держатели документа:
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Teplinskaia, A. S.; Федоров, Александр Семенович
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