Phase equillibria and solidification behaviour in the vanillin–p-anisidine system

Singh, N.B.; Das, S. S.; Gupta, Preeti; Dwivedi, Manoj Kumar

doi:10.1016/j.jcrysgro.2008.10.031

Cited by 17 publications

(9 citation statements)

References 15 publications

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“…The values of excess thermodynamic functions are also important to quantitatively analyze the nature of molecular interactions 23. Thus, excess thermodynamic functions such as excess heat of mixing H E , entropy of mixing S E , and free energy of mixing G E were determined similar as reported earlier 20, 23 and are discussed below.…”

Section: Resultsmentioning

confidence: 83%

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Solidification Behavior of the Hydrazine Nitrate‐Nitroguanidine Eutectic System

Chen

et al. 2013

Propellants Explo Pyrotec

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In an attempt to better understand the properties of energetic eutectic materials, the eutectic mixture of hydrazine nitrate (HN) and nitroguanidine (NQ) was prepared by a melt crystallization method. The melting temperature and fusion enthalpy of the pure components and the eutectic were determined using differential scanning calorimetry. The structure of the HN‐NQ title compound was characterized by infrared spectroscopy (IR), X‐ray diffraction (XRD), and scanning electron microscopy. Thermodynamic functions such as excess Gibb’s energy, excess enthalpy, and excess entropy of the title mixture were calculated using activity coefficient data. The intermolecular interactions of different molar ratios of the HN‐NQ eutectic were determined by density functional theory (DFT) methods. The results of the excess thermodynamic functions and computer simulations indicate that the eutectic is not a mechanical mixture. IR spectroscopic and XRD studies confirm that there is some interaction between the components during the formation of the eutectic mixture. Moreover, the microstructure of the eutectic mixture at a molar ratio of 3 : 2 was more uniform than others, which was proved by DFT calculations. The Jackson’s roughness parameter was found to be greater than 2, suggesting a faceted, irregular morphology. These results could pave a way for further investigation of the energetic eutectic system aiming to supersede TNT.

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Section: Resultsmentioning

confidence: 83%

“…Despite the extensive studies of organic eutectic systems focusing on the microstructure, crystallization and solidification behavior in recent years 12–20, the mechanism is not fully explored. For the sake of potential applications of eutectic mixtures, the study of their crystallization is indispensable.…”

Section: Introductionmentioning

confidence: 99%

Solidification Behavior of the Hydrazine Nitrate‐Nitroguanidine Eutectic System

Chen

et al. 2013

Propellants Explo Pyrotec

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“…The values of excess thermodynamic functions are also very important in the quantitative analysis of the nature of molecular interactions [15]. Thus in order to have an idea about the nature of interaction between two components forming the eutectic, some excess thermodynamic functions such as excess Gibb's free energy (G E ), excess enthalpy (H E ), and excess entropy (S E ) were determined in a manner similar to that reported earlier [15,18] from the solidus-liquidus equilibrium data of BA-o-CBA system which obeys the phase equilibrium relation.…”

Section: à1mentioning

confidence: 95%

Studies of Solidification Behavior and Molecular Interaction in Benzoic Acid–o-Chloro Benzoic Acid Eutectic System

Das

Singh²,

Agrawal³

et al. 2009

Molecular Crystals and Liquid Crystals

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Phase diagram of benzoic acid (BA)-o-chloro benzoic acid (o-CBA) system has been studied by thaw melt method and the results show the formation of a simple eutectic mixture. Heats of fusion values of the components and eutectic mixture were determined with the help of differential scanning calorimeter. Excess Gibb's free energy (G E ), excess enthalpy (H E ), and excess entropy (S E ) of mixing of pre-, post-, and the eutectic mixture were calculated. FT-IR spectroscopic studies and ab initio calculations were done to have an idea about the nature of interaction between the molecules in the eutectic mixture. Linear velocities of crystallization of the two components and the eutectic mixture were determined at different undercoolings. Microstructural studies of BA and o-CBA showed the formation of broken lamellar and lamellar type microstructure, whereas for the eutectic mixture growth of flat crystals in different directions from a particular point was obtained. The isotropic as well as the anisotropic solidification behavior was studied. Jackson's roughness parameter was calculated. Modulus of ruptures of pure components and the eutectic mixture were determined. Results show that eutectics are nonideal mixtures, and some weak interactions are involved between the two components.

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“…Excess Gibbs energy (G E ), excess entropy (S E ), and excess enthalpy (H E ) were calculated in a similar way as reported earlier [12][13][14][15][16]. The phase diagram of SCN-VN is divided into two parts, so as to make two simple eutectic type systems VN-CMC and CMC-SCN.…”

Section: Thermodynamic Propertiesmentioning

confidence: 99%

“…So the study of solid-liquid equilibria is of interest for the development of theoretical models and their application in the chemical industry. During the last few years, the phase diagram, solidification behavior, microstructures, and other properties of binary organic systems forming eutectic mixtures and congruent melting compounds (CMC) have been studied [9][10][11][12][13][14][15][16]. However, different systems under different conditions exhibit different properties.…”

Section: Introductionmentioning

confidence: 99%

Phase Diagram Study of Succinonitrile-Vanillin Organic Alloy System

Singh

Gupta

Das

et al. 2014

Molecular Crystals and Liquid Crystals

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Phase diagram studies of succinonitrile-vanillin system show the formation of 2:1 congruent melting type compound. Crystallization velocities of pure components, succinonitrile-vanillin complex, and two eutectics have been determined at different undercoolings. On the basis of heat of fusion measurements, excess thermodynamic functions have been calculated. Microstructural studies revealed that impurities modify the morphology. FTIR spectral studies and computer simulation have shown the existence of hydrogen bonding in the eutectics and the congruent melting compound.On the basis of experimental results, the mechanism of formation of eutectics and its solidification behavior are discussed.

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Phase equillibria and solidification behaviour in the vanillin–p-anisidine system

Cited by 17 publications

References 15 publications

Solidification Behavior of the Hydrazine Nitrate‐Nitroguanidine Eutectic System

Solidification Behavior of the Hydrazine Nitrate‐Nitroguanidine Eutectic System

Studies of Solidification Behavior and Molecular Interaction in Benzoic Acid–o-Chloro Benzoic Acid Eutectic System

Phase Diagram Study of Succinonitrile-Vanillin Organic Alloy System

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