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Hawrylak, Brent; Burke, Shannon; Palepu, R.

doi:10.1023/a:1005198230692

Cited by 115 publications

(36 citation statements)

References 20 publications

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“…The maximum in C E p,m (water + AMP) increases and shifts towards higher mole fractions with increasing temperature so that, at T 308.15 K, the values of C E p,m (water + AMP) at high mole fractions change sign to become positive. As shown in figure 7, the values of V E m (water + AMP) are negative at all temperatures, and have the same shape as those of (water + MDEA) at T = 298.15 K. (6) The magnitude of V E m (water + AMP) decreases with increasing temperature. TABLE 10.…”

Section: Resultsmentioning

confidence: 69%

“…The corresponding values of V * m,2 (MDEA) have been reported elsewhere, (6) and were not included in this study. Excess molar properties were calculated from the experimental heat capacities and volumes, according to the usual expression for a binary system, (4) where x 2 is the mole fraction of amine.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 6 shows the excess molar volumes of MDEA (aq). (6) The experimental values of V E m (water + AMP) were fitted by equation (6) by using three parameters and the weighting factor 1/{x 2 (1 − x 2 )}. The parameters are given in table 11.…”

Section: Resultsmentioning

confidence: 99%

“…To determine the extent of region (i) in these two systems, we have used values for C E p,m and V E m at low mole fractions, 0.002 < x 2 < 0.05, from measurements in the Picker calorimeter and the Sodev densimeter, to determine the standard partial molar properties )} to x 2 (MDEA) = 0 and by using the parameters for equation (6) listed in table 9, which indicates that any maximum or minimum in the reduced properties must lie below the limit of measurements in the Picker calorimeter and densimeter {x 2 ((MDEA) < 0.002}. The same is true for (V o 2 − V * 2 ) obtained by extrapolations of the parameters in reference 6.…”

Section: Discussionmentioning

confidence: 99%

“…Values for the heat capacities of pure MDEA and AMP have been reported in the literature, (4,5) as have some values for the apparent molar heat capacities and volumes of aqueous MDEA (6,7) and AMP. (8,9) Most of these studies are over a limited range of temperature and composition.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Thermodynamics of aqueous amines: excess molar heat capacities, volumes, and expansibilities of {water+ methyldiethanolamine (MDEA)} and {water + 2-amino-2-methyl-1-propanol (AMP)}

Zhang

Hawrylak

Palepu

et al. 2002

The Journal of Chemical Thermodynamics

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thermodynamics of aqueous amines: excess molar heat capacities, volumes, and expansibilities of {water+ methyldiethanolamine (MDEA)} and {water + 2-amino-2-methyl-1-propanol (AMP)}

Zhang

Hawrylak

Palepu

et al. 2002

The Journal of Chemical Thermodynamics

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The Sound Velocity in Ideal Liquid Mixtures from Thermal Volume Fluctuations

Pfeiffer

Heremans

2005

ChemPhysChem

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The selection of the correct mixing rule for sound velocity in ideal liquid mixtures determines the interpretation of the sound velocity in real mixtures. This is especially important for the determination of apparent properties of solutes, such as their apparent compressibility. There are different approaches reported in the literature, and this article presents a new derivation of the mixing rule based on statistical mechanics. It is shown that the correlation of volume fluctuations between adjacent components has a crucial influence on the ideal mixing rule.

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Correlated Volume Fluctuations in Binary Liquid Mixtures from Isothermal Compressions at 298.15 K

Reis¹,

Santos²,

Dias³

et al. 2008

ChemPhysChem

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New fluctuation-related properties are introduced based on the link between the mean-squared fluctuation of the volume and the isothermal compressibility of binary liquid mixtures by applying the methods of chemical thermodynamics. Some weaknesses have been pointed out in previous similar attempts by other authors. A different result is obtained when Pfeiffer and Heremans' model for correlated volume fluctuations is worked out in terms of the PTN ensemble (i.e. at constant pressure and temperature). An expression is derived for estimating adjusted correlation coefficients in pairwise volume fluctuations from the knowledge of excess molar isothermal compressions, and it is shown that this expression predicts bounding values for the latter property in real mixtures. Ultrasound speeds in 31 aqueous mixtures of 2-(ethylamino)ethanol are reported at 298.15 K. The adjusted correlation coefficients for volume fluctuations are graphically depicted at several compositions of two nonaqueous mixtures and eleven aqueous amphiphile mixtures at 298.15 K. This procedure is shown to be an effective means of monitoring interactions between unlike molecules in binary liquid mixtures. A surprisingly high limiting adjusted correlation coefficient is found for water in neat amino alcohols and alcohols possessing a tertiary functional group.

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Cited by 115 publications

References 20 publications

Thermodynamics of aqueous amines: excess molar heat capacities, volumes, and expansibilities of {water+ methyldiethanolamine (MDEA)} and {water + 2-amino-2-methyl-1-propanol (AMP)}

Thermodynamics of aqueous amines: excess molar heat capacities, volumes, and expansibilities of {water+ methyldiethanolamine (MDEA)} and {water + 2-amino-2-methyl-1-propanol (AMP)}

The Sound Velocity in Ideal Liquid Mixtures from Thermal Volume Fluctuations

Correlated Volume Fluctuations in Binary Liquid Mixtures from Isothermal Compressions at 298.15 K

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