Refractive index and excess volume for binary liquid mixtures. Part 1.—Analyses of new and old data for binary mixtures

Nakata, Mitsuo; Sakurai, Masaru

doi:10.1039/f19878302449

Cited by 88 publications

(45 citation statements)

References 3 publications

(3 reference statements)

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“…Thus Equation (12) evidences the role of the difference n A * Àn B * in determining refractive properties of binary mixtures, which has been noted before on an empirical basis. [4,14] It also furnishes a rationale for the simplicity of nearly isorefractive mixtures.…”

Section: Ideal Refractive Index Of Mixingmentioning

confidence: 99%

“…Typically, at ambient temperature and pressure the refractive index of common molecular and ionic liquids lies in the range 1.2-1.6 and can be easily and accurately determined experimentally with uncertainties as low as 0.5 10 À4 [3] or even 2 10 À6 in the case of differential measurements. [4] There are, however, some controversial issues regarding the analysis of refractive indices of liquid mixtures, which are due to the lack of a sound theoretical basis. In effect, doubts have been cast on the legitimacy of applying the thermodynamic concepts of ideal and excess quantities to the index of refraction because this is an optical property.…”

Section: Introductionmentioning

confidence: 99%

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Refractive Index of Liquid Mixtures: Theory and Experiment

et al. 2010

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An innovative approach is presented to interpret the refractive index of binary liquid mixtures. The concept of refractive index "before mixing" is introduced and shown to be given by the volume-fraction mixing rule of the pure-component refractive indices (Arago-Biot formula). The refractive index of thermodynamically ideal liquid mixtures is demonstrated to be given by the volume-fraction mixing rule of the pure-component squared refractive indices (Newton formula). This theoretical formulation entails a positive change of refractive index upon ideal mixing, which is interpreted in terms of dissimilar London dispersion forces centred in the dissimilar molecules making up the mixture. For real liquid mixtures, the refractive index of mixing and the excess refractive index are introduced in a thermodynamic manner. Examples of mixtures are cited for which excess refractive indices and excess molar volumes show all of the four possible sign combinations, a fact that jeopardises the finding of a general equation linking these two excess properties. Refractive indices of 69 mixtures of water with the amphiphile (R,S)-1-propoxypropan-2-ol are reported at five temperatures in the range 283-303 K. The ideal and real refractive properties of this binary system are discussed. Pear-shaped plots of excess refractive indices against excess molar volumes show that extreme positive values of excess refractive index occur at a substantially lower mole fraction of the amphiphile than extreme negative values of excess molar volume. Analysis of these plots provides insights into the mixing schemes that occur in different composition segments. A nearly linear variation is found when Balankina's ratios between excess and ideal values of refractive indices are plotted against ratios between excess and ideal values of molar volumes. It is concluded that, when coupled with volumetric properties, the new thermodynamic functions defined for the analysis of refractive indices of liquid mixtures give important complementary information on the mixing process over the whole composition range.

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Section: Ideal Refractive Index Of Mixingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Refractive Index of Liquid Mixtures: Theory and Experiment

et al. 2010

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“…Las técnicas experimentales para determinar el índice de refracción de sistemas líquidos son relativamente más simples [19]. Aplicando la regla de mezclas, es posible predecir el volumen de exceso molar desde índices de refracción de sistemas multicomponentes [20] y [21].…”

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“…Método Ι. Ecuación propuesta por Nakata y Sakurai en 1987 [21], basada en el uso de la refracción específica, ( )/ , y la definición de volumen de exceso molar:…”

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Mezclas binarias de líquido iónico con solvente molecular: Predicción del volumen de exceso molar desde índices de refracción

Reina

González

2011

Cien.Ing.Neogranadina

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RESUMENEl volumen de exceso molar de 30 mezclas binarias que contienen líquidos iónicos de imidazolio con diferentes solventes moleculares: (metanol, etanol, 1-propanol, 2-propanol, acetona, 2-butanona, 2-pentanona, acetato de metilo, acetato de etilo, acetato de butilo, carbonato de dimetilo, carbonato de dietilo, nitrometano, 1,3-dicloropropano y etilenglicol),se predice desde datos de índice de refracción, usando tres tipos de métodos acoplados con diferentes reglas de mezcla para el cálculo del índice de refracción: Lorentz-Lorenz, Dale-Gladstone, Eykman, AragoBiot, Newton y Oster. En estos sistemas, las interacciones moleculares y las fuerzas intermoleculares provocan, durante la mezcla, desviaciones positivas o negativas del comportamiento ideal. Los resultados obtenidos se analizan en términos de la naturaleza del líquido iónico y solvente molecular.Palabras clave: volumen de exceso molar, índice de refracción, predicción, líquido iónico, solvente molecular. ABSTRACTThe excess molar volumes of 30 binary mixtures containing ionic liquids of imidazolium with different molecular solvents: (methanol, ethanol, propan-1-ol, propan-2-ol, acetone, 2-butanone, 2-pentanone, methyl acetate, ethyl acetate, butyl acetate, dimethyl carbonate, 21 -40,

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“…Ilyen keverékek törésmutatójának leírására az egyik leggyakrabban használt formula a Schwers (vagy Lattre) -egyenlet, amely a konkrét mintára alkalmazva [107]:…”

Section: Kétkomponensű Folyadékok Törésmutatójaunclassified

Bakteriorodopszin és koenzimek femtoszekundumos időfelbontású spektroszkópiai vizsgálata

Heiner¹

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Refractive index and excess volume for binary liquid mixtures. Part 1.—Analyses of new and old data for binary mixtures

Cited by 88 publications

References 3 publications

Refractive Index of Liquid Mixtures: Theory and Experiment

Refractive Index of Liquid Mixtures: Theory and Experiment

Mezclas binarias de líquido iónico con solvente molecular: Predicción del volumen de exceso molar desde índices de refracción

Bakteriorodopszin és koenzimek femtoszekundumos időfelbontású spektroszkópiai vizsgálata

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