Viscosity studies of solutions of water inn-aliphatic alcohols at various temperatures

D'Aprano, Alessandro; Donato, I. D.; Caponetti, Eugenio; Agrigento, Valeria

doi:10.1007/bf00648578

Cited by 31 publications

(8 citation statements)

References 20 publications

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“…Thus the decrease in viscosity when water is added to n-butanol, n-pentanol, and n-hexanol contrasts sharply with the increase showed by methanol, ethanol, and n-propanol (31). tert-Butyl alcohol shows both types of behaviour; increased viscosity with initial addition of water at higher temperature, and decreased viscosity at low.…”

Section: Resultsmentioning

confidence: 83%

Densities and viscosities of binary aqueous mixtures of nonelectrolytes: tert-Butyl alcohol and tert-butylamine

Kipkemboi¹,

Easteal²

1994

Can. J. Chem.

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PIUS K. KIPKEMBOI, and ALLAN J. EASTEAL. Can. J. Chem. 72, 1937Chem. 72, (1994. The density and shear viscosity of mixtures of tert-butyl alcohol (BuOH) and tert-butylamine (TBA) with water have been determined for various temperatures (288 to 318 K for H20 + BuOH and 288 to 308K for H20 + TBA) over the whole composition range. Excess molar volumes and apparent molar volumes of the components of each system were calculated from the density data. In both systems the apparent molar volume of the organic component passes through a minimum in the water-rich region. Both systems exhibit large negative excess molar volumes which are essentially independent of temperature at all compositions. The two systems show pronounced maxima in their shear viscosity isotherms. Chem. 72, 1937Chem. 72, (1994. On a determint les densites et les viscosites de cisaillement de melanges d'alcool tert-butylique (BuOH) et de tert-butylamine (TBA) avec de I'eau, sur l'ensemble des compositions possibles et B diverses temptratures (allant de 288 K B 318 Kj pour H20 + BuOH et de 288 K B 308 pour H20 + TBA). Utilisant les donnkes de densite, on a calculk les volumes molaires en excbs et les volumes molaires apparents des composants de chaque systkme. Dans les deux systkmes, le volume molaire apparent du composant organique passe par un minimum dans la region riche en eau. Les deux systbmes presentes des volumes molaires en excbs largement negatifs qui sont essentiellement independants de la temperature, B toutes les compositions. Les deux systbmes prtsents des maxima importants dans leurs isothermes de viscosite de cisaillement.[Traduit par la redaction]

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Section: Resultsmentioning

confidence: 83%

Densities and viscosities of binary aqueous mixtures of nonelectrolytes: tert-Butyl alcohol and tert-butylamine

Kipkemboi¹,

Easteal²

1994

Can. J. Chem.

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“…Different courses of analysed curves for various composition ranges of liquid mixtures studied observed by us are presumably associated with the size and shape of intermolecular complexes formed by ACN with alcohols studied which is a result of a different structure and H-donors properties of the alcohol molecules [23][24][25][26][27].…”

Section: Resultsmentioning

confidence: 99%

Acetonitrile - 2-Methyl-Propan-1-ol and Acetonitrile - 2-Methyl-Propan-2-ol Binary Mixtures and their Physicochemical Properties

Kinart

Ćwiklińska

et al. 2003

Physics and Chemistry of Liquids

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The 1 H-NMR spectra of liquid binary mixtures of acetonitrile with 2-methyl-propan-1-ol (i-BtOH) and 2-methyl-propan-2-ol (t-BtOH), were recorded at 298 K over almost the whole range of mixed solvent compositions. From these data the values of spectral parameters, Á(ACN-i-BtOH) and Á(ACN-t-BtOH) were found. The relative permittivities (" 12 ) and the densities (d 12 ) of the mixed solvents were measured at 288.15 K, 293.15 K, 298.15 K, 303.15 K and 308.15 K. The experimental data were used to test some empirical equations of the type: y 12 ¼ y 12 (t) and y 12 ¼ y 12 (X 1 ) [where: y 12 ¼ d 12 or " 12 ]. From all these data, the deviations from ideality molar volumes (V E 12 ), temperature coefficients of relative permittivities ( 12 ) and the excess extrathermodynamic parameters " E 12 were calculated. The values of these structural parameters are discussed in terms of interactions of acetonitrile with both alcohols.

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“…The diffusion coefficient for free CTA + can be estimated from values reported in the literature for CTA + diffusion in D 2 O, correcting for the solvent viscosities (viscosity for water-butanol mixtures was taken from ref. 23). This calculation, which should be regarded as an orderof-magnitude estimate, yields that 8% of the surfactant ions dissociate from the reverse micelles of CTAPA 30 in butanol at the highest water contents (13 wt%).…”

Section: Free Surfactant Ions and Water Moleculesmentioning

confidence: 88%

Reverse micelles with spines: L₂phases of surfactant ion—polyion complex salts, n-alcohols and water investigated by rheology, NMR diffusion and SAXS measurements

et al. 2010

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Homogeneous alcoholic isotropic solutions (L 2 phases) of ''complex salts'' of hexadecyltrimethylammonium neutralized by polyacrylate CTAPA n (n ¼ 30 or 6000), in the presence of water were examined at 25 C by means of small-angle X-ray scattering (SAXS), rheology and NMR self-diffusion measurements for different n-alcohols (octanol, hexanol and butanol) and at varying water contents. The greater water solubility and the slower water self-diffusion coefficients in these L 2 phases, when compared to results with surfactant-free alcohols, suggested that these phases are composed of reverse aggregates with water in their cores. A comparatively rapid self-diffusion of the surfactant ion in butanol suggested a significant fraction of ''free'' surfactant ions, dissociated from the reverse aggregates. Rheological data confirmed that the obtained viscoelastic properties were consistent with a system containing entangled elongated micelles, whose properties were controlled by the polyion chain length. NMR diffusion measurements for complex salt solutions with the shorter counter-polyion (CTAPA 30) produced estimates of the aggregate lengths that were close to the extended length of one PA 30 chain. In summary, these results support the formation of aggregates composed by surfactant decorated polyion chains with a water core, whose properties are determined by the polyion chain length, behaving like reverse micelles with spines.

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Viscosity studies of solutions of water inn-aliphatic alcohols at various temperatures

Cited by 31 publications

References 20 publications

Densities and viscosities of binary aqueous mixtures of nonelectrolytes: tert-Butyl alcohol and tert-butylamine

Densities and viscosities of binary aqueous mixtures of nonelectrolytes: tert-Butyl alcohol and tert-butylamine

Acetonitrile - 2-Methyl-Propan-1-ol and Acetonitrile - 2-Methyl-Propan-2-ol Binary Mixtures and their Physicochemical Properties

Reverse micelles with spines: L₂phases of surfactant ion—polyion complex salts, n-alcohols and water investigated by rheology, NMR diffusion and SAXS measurements

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Viscosity studies of solutions of water inn-aliphatic alcohols at various temperatures

Cited by 31 publications

References 20 publications

Densities and viscosities of binary aqueous mixtures of nonelectrolytes: tert-Butyl alcohol and tert-butylamine

Densities and viscosities of binary aqueous mixtures of nonelectrolytes: tert-Butyl alcohol and tert-butylamine

Acetonitrile - 2-Methyl-Propan-1-ol and Acetonitrile - 2-Methyl-Propan-2-ol Binary Mixtures and their Physicochemical Properties

Reverse micelles with spines: L2phases of surfactant ion—polyion complex salts, n-alcohols and water investigated by rheology, NMR diffusion and SAXS measurements

Contact Info

Product

Resources

About

Reverse micelles with spines: L₂phases of surfactant ion—polyion complex salts, n-alcohols and water investigated by rheology, NMR diffusion and SAXS measurements