title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ ÑÐ¿ÐµÑÐ¸ÑÐ¸ÐºÐ¸ ÑÐ°Ð·Ð¾Ð²ÑÑ Ð¿ÐµÑÐµÑ Ð¾Ð´Ð¾Ð² Ð² Ð³Ð¾Ð¼Ð¾Ð»Ð¾Ð³Ð¸ÑÐµÑÐºÐ¾Ð¼ ÑÑÐ´Ñ Ð½-Ð°Ð»ÐºÐ°Ð½Ð¾Ð² Ð¼ÐµÑÐ¾Ð´Ð¾Ð¼ Ð´Ð¸ÑÑÐµÑÐµÐ½ÑÐ¸Ð°Ð»ÑÐ½Ð¾Ð¹ ÑÐºÐ°Ð½Ð¸ÑÑÑÑÐµÐ¹ ÐºÐ°Ð»Ð¾ÑÐ¸Ð¼ÐµÑÑÐ¸Ð¸
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Investigation of the phase transitions specificity in homological series of n-alkanes by the differential scanning calorimetry method
Creators: name: ÐÐ¾ÑÐ¸ÑÐ¾Ð², ÐÑÑÐµÐ¼
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: ÐÐ°Ð»Ð¾ÑÐ¸Ð¼ÐµÑÑÐ¸Ñ
Ð¤Ð°Ð·Ð¾Ð²ÑÐµ Ð¿ÐµÑÐµÑ Ð¾Ð´Ñ
ÐÑÐ¸ÑÑÐ°Ð»Ð»Ñ
Ð¢ÐµÐ¿Ð»Ð¾ÐµÐ¼ÐºÐ¾ÑÑÑ
Ð¢ÐµÐ¿Ð»Ð¾Ð¿ÑÐ¾Ð²Ð¾Ð´Ð½Ð¾ÑÑÑ
Ð½-Ð°Ð»ÐºÐ°Ð½Ñ
Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ñ Ñ Ð¸Ð·Ð¼ÐµÐ½ÑÑÑÐµÐ¹ÑÑ ÑÐ°Ð·Ð¾Ð¹
Ð½Ð°Ð½Ð¾Ð·Ð°ÑÐ¾Ð´ÑÑ Ð½Ð¾Ð²Ð¾Ð¹
ÑÐ°Ð·Ñ
ÑÐ½ÑÐ°Ð»ÑÐ¿Ð¸Ñ
n-alkanes
phase change materials
new
phase nanonucleus
enthalpy

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description: Phase transitions in the homologous series of n-alkanes: hexadecane Ð¡ ââH ââ, heptadecane Ð¡ ââH ââ, octadecane Ð¡ ââH ââ, nonadecane Ð¡ ââH ââ, eicosane Ð¡ ââH ââ, heneicosane Ð¡ ââH ââ, docosane C ââH ââ, tricosane C ââH ââ, as well as composites based on nonadecane with the addition of metal nanopowders, were studied by differential scanning calorimetry. The dependences of the heat capacity on the temperature of the samples were obtained in the heating - cooling cycles. It has been shown that in nalkanes the transition from solid to liquid state occurs in two stages. To eliminate methodological errors and obtain the true thermodynamic parameters of phase transitions, a special extrapolation method was used, which requires DSC experiments with varying scan rates in a wide range. An experimental method has been developed for the separation of superimposed peaks of heat capacity on DSC thermograms. It is shown that the first-order phase transition is of a heterogeneous nature and is a diffuse phase transition. The application of the self-consistent field theory to the analysis of the solid-phase transition in n-alkanes made it possible to determine the values of the elementary transformation volumes for each of the studied samples. It turned out that the volumes of new phase nanonuclei in even and odd n-alkanes differ markedly, which is associated with the peculiarities of the mutual packing of the lamellas. The specific features of the regions of emergence of solid-phase transition nanonuclei are revealed: in even n-alkanes, the phase transition originates in the cores of the lamellas, and in odd ones, in the interlamellar layers. When analyzing the thermophysical properties, it was shown that n-alkanes have the highest specific molecular thermodynamic properties in comparison with other materials in the temperature range of human life. For the first time, with the introduction of nanosized metal powders into an n-alkane, an increase in thermal conductivity by a factor of 5 was obtained due to a change in the structure of the matrix.