Thermal hysteresis during the melting and crystallization of macroobjects

Александров, В. Д.; Pokyntelytsia, O. A.; Sobolev, A. Yu.

doi:10.1134/s1063784217050036

Cited by 7 publications

(4 citation statements)

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“…). По формулам (6) и (7), основываясь на результатах (табл. 1), полученных методами ЦТА и ДТА соответственно, рассчитывались степени кристалличности η и η'.…”

Section: η′ =unclassified

“…Если совместить линии нагревания и охлаждения (термограмма 1 на рис. 1), записанные соответственно в прямом (сплошная линия) и обратном (пунктирная линия) направлениях, получим температурный гистерезис первого рода [7] в виде фигуры abcʹdʹa. Результаты найденных параметров плавления и кристаллизации ЕС, полученных методами ЦТА и ДТА в различных условиях термообработки в переохлажденном состоянии, приведены в табл.…”

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Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Покинтелица,

Щебетовская

2023

bulchmedenu

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Terphenyl mixtures in the crystalline state are used as scintillators, phosphors, photoresistors, sensitizers, etc. Their structure and properties largely depend on crystallization conditions. The features of crystallization of the eutectic composition of hydrocarbons o-terphenyl (79.5 wt.%) and naphthalene (20.5 wt.%) were studied by the method of cyclic thermal analysis. As a result of experiments carried out on the eutectic alloy, it was found that the horizontal plateaus recorded during heating correspond to the melting temperature (304 K) of the eutectic alloy. It has been established that weakly heated melts crystallize isothermally at a temperature ТS=298 K, which lies below the melting temperature of the eutectic ТL=304 K. about their crystallization. With an increase in the time of isothermal holding of a metastable melt, or the time the melt stays (without holding) in a overcooled state, the length of the melting plateau in the subsequent cycle increases, which indicates an increase in the degree of crystallinity of the sample. A method is proposed for determining the degree of crystallinity η from the duration te of isothermal holding of the overcooled melt and the duration τL of melting. By this method, the bulk crystallization rate constant Z and the Avrami parameter n were calculated.

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Section: η′ =unclassified

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Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Покинтелица,

Щебетовская

2023

bulchmedenu

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“…The two-step mechanism is plausible and helps explain the overestimation of nucleation kinetics predicted by CNT [9,49,50]. Its application is limited to the observation of disordered, dense liquid or clusters in solution, but the definition of "dense liquid" precursor is vague which leads to the lack of insights into the molecular event of crystal nucleation.…”

Section: Two-step Nucleation Mechanismmentioning

confidence: 99%

“…in China and thousands of years ago all over the world. However, despite a long history, the theory of the development of crystallization is rather slow, and significant progress was made until the late-1800s when Gibbs established the thermodynamic underpinnings of phase transition [9,10].…”

Section: Introductionmentioning

confidence: 99%

Molecular Mechanism of Organic Crystal Nucleation: A Perspective of Solution Chemistry and Polymorphism

Zhou

Tang

2022

Crystals

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Crystal nucleation determining the formation and assembly pathway of first organic materials is the central science of various scientific disciplines such as chemical, geochemical, biological, and synthetic materials. However, our current understanding of the molecular mechanisms of nucleation remains limited. Over the past decades, the advancements of new experimental and computational techniques have renewed numerous interests in detailed molecular mechanisms of crystal nucleation, especially structure evolution and solution chemistry. These efforts bifurcate into two categories: (modified) classical nucleation theory (CNT) and non-classical nucleation mechanisms. In this review, we briefly introduce the two nucleation mechanisms and summarize current molecular understandings of crystal nucleation that are specifically applied in polymorphic crystallization systems of small organic molecules. Many important aspects of crystal nucleation including molecular association, solvation, aromatic interactions, and hierarchy in intermolecular interactions were examined and discussed for a series of organic molecular systems. The new understandings relating to molecular self-assembly in nucleating systems have suggested more complex multiple nucleation pathways that are associated with the formation and evolution of molecular aggregates in solution.

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Influence of alternating electric current on the process of heat accumulation in a mixture of Na₂SO₄·10H₂O–Na₂S₂O₃·5H₂O

Amerkhanova

Azhari

Shlyapov

et al. 2022

International Journal of Sustainable Energy

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Thermal hysteresis during the melting and crystallization of macroobjects

Cited by 7 publications

References 1 publication

Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Molecular Mechanism of Organic Crystal Nucleation: A Perspective of Solution Chemistry and Polymorphism

Influence of alternating electric current on the process of heat accumulation in a mixture of Na₂SO₄·10H₂O–Na₂S₂O₃·5H₂O

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Thermal hysteresis during the melting and crystallization of macroobjects

Cited by 7 publications

References 1 publication

Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Molecular Mechanism of Organic Crystal Nucleation: A Perspective of Solution Chemistry and Polymorphism

Influence of alternating electric current on the process of heat accumulation in a mixture of Na2SO4·10H2O–Na2S2O3·5H2O

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Influence of alternating electric current on the process of heat accumulation in a mixture of Na₂SO₄·10H₂O–Na₂S₂O₃·5H₂O