Effect of the character of homo- and heteronuclear chemical bond on the intermolecular interaction energy and properties of halogens and hydrogen halides

Сироткин, О. С.; Сироткин, Р. О.; Шибаев, П. Б.

doi:10.1134/s0036023611070266

Cited by 11 publications

(35 citation statements)

References 1 publication

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“…Here, KNO 3 has been found slightly more stable compared to NaNO 3 and the eutectic KNO 3 -NaNO 3 (Fig. 4) [8,10,15]. Experimental difficulties with salt creeping have been reported.…”

Section: High-temperature Regionmentioning

confidence: 79%

“…At temperatures higher than 500 • C, creeping salt in contact with materials, such as stainless steel or quartz leads also to the liberation of nitrogen oxides [8]. NaNO3 (kintetics, DLR this work) NaNO3 (oven 2600 h, this work) NaNO3 Bradshaw [12] NaNO3 Sirotkin [15] KNO3-NaNO3 Bradshaw [12] KNO3-NaNO3 Nissen [8] KNO3-NaNO3 Kust [13] KNO3 Bradshaw [12] KNO3 Freeman [10] KNO3 Sirotkin [15] Decomposition with nitrogen release and oxide formation Little nitrite formation Figure 4 shows the nitrite concentration in different alkali metal nitrates depending on the temperature in the three characteristic regions. It can be concluded that heating of the PCM far above the melting temperature may lead to some constraints, since the NO 2 − results in a change in the NaNO 3 melting behavior.…”

Section: High-temperature Regionmentioning

confidence: 99%

“…It is well known that molten nitrates decompose to nitrites in the intermediate temperature region from about 450 • C to 550 • C. The thermal dissociation is reversible, and the equilibrium reaction can be written for NaNO 3 as [8,[11][12][13][14][15][16] NaNO 3(l) ↔ NaNO 2(l) + 1/2 O 2(g) (1) Kinetic data of the oxidation and decomposition of different alkali metal nitrates have been reported. They include KNO 3 /KNO 2 [10][11][12]15], KNO 3 -NaNO 3 /KNO 2 -NaNO 2 [8,12], and NaNO 3 /NaNO 2 [12,15].…”

Section: Intermediate Temperature Region (450 • C To 550 • C)mentioning

confidence: 99%

“…They include KNO 3 /KNO 2 [10][11][12]15], KNO 3 -NaNO 3 /KNO 2 -NaNO 2 [8,12], and NaNO 3 /NaNO 2 [12,15]. The time to reach equilibrium depends on parameters, such as the reaction direction (decomposition or oxidation), the atmosphere, and the experimental setup.…”

Section: Intermediate Temperature Region (450 • C To 550 • C)mentioning

confidence: 99%

“…The thermal decomposition of NaNO 3 can be divided into three characteristic regions [10][11][12][13][14][15][16] Literature about the low-temperature region (T m to 450 • C) is generally limited. Kust reported about experiments of the eutectic KNO 3 -NaNO 3 with T m = 222 • C. They found small amounts of nitrites at temperatures as low as 295 • C in the melt.…”

Section: Thermal Stability Of Nano and Nitrite Formationmentioning

confidence: 99%

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Characterization of Sodium Nitrate as Phase Change Material

2011

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In this article the results of material investigations of sodium nitrate (NaNO 3 ) with a melting temperature of 306 • C as a phase change material (PCM) are presented. The thermal stability was examined by kinetic experiments and longduration oven tests. In these experiments the nitrite formation was monitored. Although some nitrite formation in the melt was detected, results show that the thermal stability of NaNO 3 is sufficient for PCM applications. Various measurements of thermophysical properties of NaNO 3 are reported. These properties include the thermal diffusivity by the laser-flash, the thermal conductivity by the transient hot wire, and the heat capacity by the differential scanning calorimeter method. The current measurements and literature values are compared. In this article comprehensive temperature-dependent thermophysical values of the density, heat capacity, thermal diffusivity, and thermal conductivity in the liquid and solid phases are reported.

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“…Here, KNO 3 has been found slightly more stable compared to NaNO 3 and the eutectic KNO 3 -NaNO 3 (Fig. 4) [8,10,15]. Experimental difficulties with salt creeping have been reported.…”

Section: High-temperature Regionmentioning

confidence: 79%

Section: High-temperature Regionmentioning

confidence: 99%

Section: Intermediate Temperature Region (450 • C To 550 • C)mentioning

confidence: 99%

Section: Intermediate Temperature Region (450 • C To 550 • C)mentioning

confidence: 99%

Section: Thermal Stability Of Nano and Nitrite Formationmentioning

confidence: 99%

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Characterization of Sodium Nitrate as Phase Change Material

2011

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“Chemical Triangle” as a modern intellectual basis for digital systematization of energy characteristics of substances

Сироткин

2021

E3S Web Conf.

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It was shown that sustainable power and mechanical engineering relies primarily on chemical transformation of matter, since a chemical substance (in the form of homo- and heteronuclear compounds of elements) is the most accessible type of substance on Earth. As a result, low-, oligo- and high-molecular and non-molecular (metallic and ionic) chemicals and products (fuels, polymers, alloys, glasses, etc.) are primary raw materials for production of thermal and electrical energy, as well as materials needed for alternative energy production. It was noted that the main drawback of the modern expert system for assessing the energy properties of substances used as fuels is not taking into account the influence of the chemical bond type on its energy and energy characteristics of fuels in general. It was shown that the solution to this problem is possible through the use of the unified model of chemical bond of elements, which considers any chemical bond as an overlay (resonance) of a 100% covalent bond with either metal or metal and ionic components, with a subsequent assessment of the effect of each of them on total energy of the mixed bond. This model is the fundamental basis of the System of chemical bonds and compounds (SCBC) in the form of the “Chemical Triangle”. The possibility of using the “Chemical Triangle” as a modern intellectual basis for digital systematization and creation of a database of energy characteristics of various substances based on homo- and heteronuclear compounds of elements was shown. A computer database was developed to assess the complex impact of composition and chemical bond type on its energy characteristics, structure and properties of substances and materials.

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Modern materialistic understanding of the “energy” notion and the method of its systemic evaluation in chemicals

Сироткин

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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It was shown that the traditional approaches to understanding the notion of “energy” as a work or a physical quantity are outdated. For example, R. Feynman noted that “today’s physics does not know what energy is.” Therefore, even now, some researchers believe that “by and large, the concept of energy… is artificial, because unlike matter, of which we can say that it exists, energy is the fruit of human thought.” In contrast to these ideas, the authors showed that energy, like matter, objectively exists in various forms (energy continuum), which differ in structure, and is able to perform different types of work, to determine the forms of interaction and movement of matter in various material systems (substances, material bodies and megamaterial systems). A new scientific foundation for systematization and quantitative evaluation of energy characteristics of chemical compounds was proposed. It is based on a comprehensive assessment of contribution of chemical compounds’ composition and chemical bond type in line with a chemical bond’s unified model and the “System of chemical bonds and compounds” (SCBC). As a result of using this basic scientific innovation, the symbiosis of Mendeleev’s periodic table of atoms (composition – property) and SCBC (composition - chemical bond and structure – property) was realized for the first time. The foundation was laid for creating a database on systemic digitalization and evaluation of energy stored in various chemicals (natural gas, coal, oil, peat, wood, etc.) and the most effective ways of extracting it from these.

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Effect of the character of homo- and heteronuclear chemical bond on the intermolecular interaction energy and properties of halogens and hydrogen halides

Cited by 11 publications

References 1 publication

Characterization of Sodium Nitrate as Phase Change Material

Characterization of Sodium Nitrate as Phase Change Material

“Chemical Triangle” as a modern intellectual basis for digital systematization of energy characteristics of substances

Modern materialistic understanding of the “energy” notion and the method of its systemic evaluation in chemicals

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