Melting of 1-octadecene inside the pores of open-morphology silica gel: thermodynamic model and experimental studies

被引：11

作者：

Hnatiuk, K. I. ^{[1
]}

Dinzhos, R. V. ^{[2
]}

Simeonov, M. S. ^{[3
]}

Alekseev, A. N. ^{[1
]}

Alekseev, S. A. ^{[1
]}

Sirko, V. V. ^{[1
]}

Zabashta, Yu. F. ^{[1
]}

Koseva, N. S. ^{[4
]}

Lazarenko, M. M. ^{[1
]}

机构：

[1] Taras Shevchenko Natl Univ Kyiv, 60 Volodymyrska St, UA-01033 Kiev, Ukraine

[2] Mykolaiv VO Sukhomlynskyi Natl Univ, 24 Nikolska St, UA-54030 Mykolaiv, Ukraine

[3] Univ Sofia, 1 James Bourchier Blvd, Sofia 1164, Bulgaria

[4] Bulgarian Acad Sci, Inst Polymers, Akad G Bonchev St,Block 103-A, BU-1113 Sofia, Bulgaria

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2020年 / 141卷 / 03期

关键词：

Melting; Phase transition; Nanopores; Surface tension effects; 1-Octadecene; Silica gel; SOLID PHASE-TRANSITION; POLYAMIDE-6/ORGANOCLAY NANOCOMPOSITES; COOLING/HEATING CYCLES; ENTHALPY RELAXATION; BEHAVIOR;

D O I：

10.1007/s10973-019-09133-4

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Melting of crystalline compounds inside the nanopores of open-morphology porous systems was studied on a model system, consisted of 1-octadecene and silica gels with different pore sizes, by means of thermogravimetry, differential scanning calorimetry and powder X-ray diffraction. The parameters of silica gels porous structure (surface area, pore size and volume) were calculated using N-2 adsorption data. To describe the experimental results, a new thermodynamic model of crystallites melting inside the nanopores of irregular shape was established. This model allows an analytical prediction for the shift of phase transition temperature and melting enthalpy (latent heat of melting) due to the surface tension effects. To a first approximation, both parameters must linearly depend on the specific ratio of the total surface of pores to their total volume, and experimental studies have mostly confirmed this result for the melting of 1-octadecene confined inside the pores of a wide range of various silicas (with the pores of different sizes and geometry).

引用

页码：1243 / 1250

页数：8

共 1 条

[1] Melting of 1-octadecene inside the pores of open-morphology silica gel: thermodynamic model and experimental studies
K. I. Hnatiuk
R. V. Dinzhos
M. S. Simeonov
A. N. Alekseev
S. A. Alekseev
V. V. Sirko
Yu. F. Zabashta
N. S. Koseva
M. M. Lazarenko
Journal of Thermal Analysis and Calorimetry, 2020, 141 : 1243 - 1250

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