Thermal, physicochemical and microstructural studies of binary organic eutectic systems

Reddi, Ravikumar; Satuluri, V. S.A. Kumar; S., U.; N., R.

doi:10.1007/s10973-011-1478-9

Cited by 20 publications

(9 citation statements)

References 31 publications

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“…The deviation from ideal behavior and the type of interactions governing the systems can be better explained by means of excess thermodynamic functions, namely excess Gibbs energy (G E ), enthalpy (H E ), and entropy (S E ) [38][39][40]. These functions give a more quantitative idea about the nature of molecular interactions and are expressed as the difference between the thermodynamic functions of a real system and the ideal one at the same temperature and pressure.…”

Section: Application Of Semi-empirical Modelsmentioning

confidence: 99%

Solid + liquid equilibria and molecular structure studies of binary mixtures for nitrate ester’s stabilizers: Measurement and modeling

et al. 2018

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A B S T R A C TSolid-liquid equilibria (SLE) data for two binary organic mixtures of N-(2-methoxyethyl)-p-nitroaniline + Nethyl-4-nitroaniline (S1) and N-(2-ethanol)-p-nitroaniline + N-ethyl-4-nitroaniline (S2) have been measured using differential scanning calorimeter to build the corresponding solid-liquid phase diagrams. The quality of the SLE data has been checked by consistency tests, presenting good quality factors for both systems. Simple eutectic behavior has been observed for these systems with the presence of a solid-solid transition for S2. The SLE data have been correlated by means of Wilson, NRTL, and UNIQUAC equations. The used models calculate the equilibrium temperatures very satisfactorily. The best modeling results were obtained using the Wilson equation with a root mean square deviation between experimental and calculated values for S1 and S2 of 1.15 and 1.99, respectively. The Wilson, NRTL, and UNIQUAC equations have also been used to compute excess thermodynamic functions viz. excess Gibbs energy, enthalpy, and entropy. The obtained results demonstrated a moderate positive deviation to ideality for S1, and a strong positive deviation for S2, unveiling the nature of the interactions between the compounds forming each mixture. In addition, microstructural studies have been carried out by FTIR, XRD and optical microscopy. Weak molecular interactions have been shown for the eutectic compositions. Jackson's roughness parameter was calculated and found to be greater than 2, suggesting the faceted morphology with irregular structures.

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Section: Application Of Semi-empirical Modelsmentioning

confidence: 99%

Solid + liquid equilibria and molecular structure studies of binary mixtures for nitrate ester’s stabilizers: Measurement and modeling

et al. 2018

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“…The deviation from ideal behavior and the types of interactions governing the system can be better explained by means of excess thermodynamic functions, namely excess Gibbs energy (G E ), excess enthalpy (H E ) and excess entropy (S E ) [23][24][25]. These functions give a more quantitative idea about the nature of molecular interactions and are expressed as the difference between the thermodynamic functions of a real system and the ideal one at the same temperature and pressure.…”

Section: Application Of Semi-empirical Modelsmentioning

confidence: 99%

Solid–Liquid Phase Equilibria, Molecular Interaction and Microstructural Studies on (N-(2-ethanol)-p-nitroaniline + N-(2-acetoxyethyl)-p-nitroaniline) Binary Mixtures

et al. 2018

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Differential scanning calorimetry (DSC) is used to investigate the thermal properties of N-(2-ethanol)-p-nitroaniline + N-(2-acetoxyethyl)-p-nitroaniline, and their binary systems. The experimental results demonstrate that the studied binary system presents a simple eutectic behavior and the corresponding mole fraction (x eu) of N-(2-ethanol)p-nitroaniline at the eutectic point is 0.5486, whereas the temperature (T eu) is found to be equal to 363.6 K. The quality of the solid-liquid equilibria (SLE) data has been checked by thermodynamic consistency tests, presenting good quality factor. The SLE data have been correlated by means of Wilson, NRTL, and UNIQUAC equations. The three models describe satisfactorily the phase diagram as the root-mean-square deviations for the equilibrium temperatures vary from 1.25 K to 2.07 K. Nevertheless, the Wilson model provides the best correlation results. The three equations have also been used to compute excess thermodynamic functions viz. excess Gibbs energy, enthalpy and entropy. The obtained results revealed a sensitive positive deviation to ideality thus demonstrating the nature of the interactions between the compounds forming the mixture. Microstructural studies have been carried out by FTIR, XRD and optical microscopy showing weak molecular interactions for the eutectic mixture.

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“…The enthalpy of mixing was found negative (Table 1) in each eutectic of 4-chloro- 3-nitroaniline (1)-3-hydroxy-4-methoxybenzaldehyde (2) and 4hydroxy-3-methoxybenzaldehyde (1)-2-amino-4-nitrophenol (2) systems suggesting that clustering of appropriate molecules. 54 The excess thermodynamics function such as excess free energy (g E ), excess enthalpy (h E ) and excess entropy (s E ) for eutectic composition were computed by using eqn (7)-(9) as reported earlier, 50…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

“…11(a and b) it is apparent that diameter of the Nyquist plots in presence of studied SBs are higher than in their absence indicating that inhibition of metallic corrosion occurs via formation of protective lm at metal/electrolyte interfaces. [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] Several electrochemical impedance parameters such as R s (solution resistance), polarization resistance (R p ), and phase shi (n) double layer capacitance (C dl ) were derived using equivalent circuit and presented in Table 9. The inhibition efficiencies at different studied concentration have been evaluated using eqn (2) and are also summarized in the same table.…”

Section: Corrosion Inhibition Studymentioning

confidence: 99%

Synthesis, characterization and corrosion inhibition potential of two novel Schiff bases on mild steel in acidic medium

et al. 2017

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Thermal, physicochemical and microstructural studies of binary organic eutectic systems

Cited by 20 publications

References 31 publications

Solid + liquid equilibria and molecular structure studies of binary mixtures for nitrate ester’s stabilizers: Measurement and modeling

Solid + liquid equilibria and molecular structure studies of binary mixtures for nitrate ester’s stabilizers: Measurement and modeling

Solid–Liquid Phase Equilibria, Molecular Interaction and Microstructural Studies on (N-(2-ethanol)-p-nitroaniline + N-(2-acetoxyethyl)-p-nitroaniline) Binary Mixtures

Synthesis, characterization and corrosion inhibition potential of two novel Schiff bases on mild steel in acidic medium

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