Solvatochromic characterization of the liquid phase in liquid—supercritical CO<sub>2</sub> mixtures

Kelley, Sean P.; Lemert, Richard M.

doi:10.1002/aic.690420725

Cited by 43 publications

(44 citation statements)

References 42 publications

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“…to be 582 nm by Figueras 1971 . This value lies between data Ž collected in this work and those reported previously Kelley . and Lemert, 1996 .…”

Section: Precipitation Experimentssupporting

confidence: 85%

“…All results suggest that the absorption᎐peak wavelength, macroscopic measurement of microscopic bulk-phase dielectric properties, is a fundamental property that can determine the onset precipitation pressure for a given solute᎐solvent system. 1987a;Kelley and Lemert, 1996;Figueras, 1971 . Here we relate the transition energy to the local composition of the dye.…”

Section: Precipitation Experimentsmentioning

confidence: 99%

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Relationship between volume expansion, solvent‐power, and precipitation in GAS processes

et al. 2003

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“…to be 582 nm by Figueras 1971 . This value lies between data Ž collected in this work and those reported previously Kelley . and Lemert, 1996 .…”

Section: Precipitation Experimentssupporting

confidence: 85%

Section: Precipitation Experimentsmentioning

confidence: 99%

Relationship between volume expansion, solvent‐power, and precipitation in GAS processes

et al. 2003

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“…(In this paper, analysis is conducted via per-atom quantities.) Figure 2 shows spectral shift data representative of what is observed in the present work and other recent experiments in GXLs (3,(7)(8)(9). As illustrated here, analysis according to eqs 1 and 2 suggests very large differences between local and bulk compositions.…”

Section: X:(\) = [V-v(2)]/[v(\)-v(2)]supporting

confidence: 55%

Solvatochromism and Solvation Dynamics in CO₂-Expanded Liquids

Swalina

Arzhantzev

et al. 2009

Gas-Expanded Liquids and Near-Critical Media

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Molecular dynamics (MD) simulations and electronic spectroscopy are used to investigate solvatochromism and solvation dynamics in CH 3 CN+CO 2 mixtures. Experimental results for the probe solute trans-4-(dimethylamino)-4'-cyanostilbene (DCS) reveal a nonlinear dependence of the solvatochromic shifts upon composition, suggesting substantial preferential solvation of DCS by CH 3 CN. MD simulations show that analyzing these shifts using the common assumption of spectral additivity leads to grossly exaggerated estimates of the extent of this preference. Solvation dynamics has been measured using Kerr-gated emission spectroscopy and calculated using MD simulations. Simulation-experiment comparisons offer an interpretation of the observed dynamics in terms of nonspecific preferential solvation.

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“…Possible mechanism : Generally, the solubilization capacity of water in reverse micelles can be interpreted based on a consideration of the R ratio, which compares the balance of the individual cohesive energies of the functional groups present at the interface 20. Addition of compressed CO 2 will decrease the solvent power of an organic solvent,8, 25 which should result in a decrease of the value of R ratio. As a result, the single‐phase region will shift to higher temperature and thus decrease the solubilization of water in this system, because the experimental temperatures are well below the phase‐inversion temperature in cyclohexane 26.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of the Solubilization Capacity of Water in Triton X‐100/Cyclohexane/Water System by Compressed Gases

Dong

Zhang

Han

et al. 2004

Chemistry A European J

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The effect of compressed CO2 and ethylene on the properties of Triton X-100/cyclohexane/water systems was studied at different temperatures and pressures. Surprisingly, it was discovered that the compressed gases had the functions of co-surfactants. At suitable pressures, the water-to-surfactant molar ratio (W0) was enhanced significantly by the dissolution of the gas in the solution. The microenvironment in the reverse micelles was investigated by UV-visible spectroscopy by using methyl orange (MO) as a probe. The influence of n-hexane, Na2CO3, NaHCO3, H2C2O4, and CaCl2 at various concentrations on the solubilization of water in the absence of compressed gases was also investigated in order to obtain some information about the mechanism of the interesting phenomenon. This new route to stabilize reverse micelles may have potential applications to other similar systems. Moreover, the results of this work provide some useful information to get insight into the mechanism of co-surfactants, because a conventional co-surfactant usually contains both polar group and hydrocarbon chain, and it is very difficult to clarify the functions these two groups, while the gases used in this work are small nonpolar molecules, which solely have the function of the hydrocarbon chain in a co-surfactant.

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Solvatochromic characterization of the liquid phase in liquid—supercritical CO₂ mixtures

Abstract: The soluatochromic dye phenol blue (4 N-dimethylindoaniline

Cited by 43 publications

References 42 publications

Relationship between volume expansion, solvent‐power, and precipitation in GAS processes

Relationship between volume expansion, solvent‐power, and precipitation in GAS processes

Solvatochromism and Solvation Dynamics in CO₂-Expanded Liquids

Enhancement of the Solubilization Capacity of Water in Triton X‐100/Cyclohexane/Water System by Compressed Gases

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Solvatochromic characterization of the liquid phase in liquid—supercritical CO2 mixtures

Abstract: The soluatochromic dye phenol blue (4 N-dimethylindoaniline

Cited by 43 publications

References 42 publications

Relationship between volume expansion, solvent‐power, and precipitation in GAS processes

Relationship between volume expansion, solvent‐power, and precipitation in GAS processes

Solvatochromism and Solvation Dynamics in CO2-Expanded Liquids

Enhancement of the Solubilization Capacity of Water in Triton X‐100/Cyclohexane/Water System by Compressed Gases

Contact Info

Product

Resources

About

Solvatochromic characterization of the liquid phase in liquid—supercritical CO₂ mixtures

Solvatochromism and Solvation Dynamics in CO₂-Expanded Liquids