Static dielectric constant, viscosity, and structure of pure isomeric pentanols

Viscosity and Thermodynamics of Viscous Flow for the Systems of Isomeric Pentanols with Toluene

“…1. The viscosity of different isomers of pentanol as reported by D'Aprano et al [6,7] and Saleh et al [2] are in good agreement with the present values. The viscosity and excess viscosity of the binary mixtures of pentanols in toluene at different temperatures are shown in Table II.…”

“…excess viscosity and excess free energy follow the order: 3-pentanol > 2-pentanol > 1-pentanol, which in turn reflect the extent of dissociation mainly due to dispersion forces. D'Aprano et al [7] calculated the Kirkwood correlation coefficient, I K , from the dielectric constant values of pentanol isomers in the temperature range of 303.15 and 323.15 K and found that the values of I K vary in the order: 1-pentanol > 2-pentanol > 3-pentanol. Since I K is a measure of the short range order in polar liquids, it follows that the pentanol whose I K is larger, i.e., which is more strongly bounded by H-bond, is less likely to be dissociated than the pentanol with smaller I K , i.e.…”

“…Recent studies about volumetric properties of these pentanols with toluene [1], viscometric and thermodynamic properties of pentanols þ n-heptane [2,3] carried out in our laboratory are considered as highly relevant to the present work. Other works of sufficient interest in relation to the present one are those of D'Aprano [4][5][6][7][8]. We report here the viscosity and relevant thermodynamic activation parameters for the binary mixtures of 1-pentanol, 2-pentanol and 3-pentanol with toluene, which as far as we know, are not available in literature.…”

Excess volumes and dielectric properties for (methyl methacrylate + a branched alcohol) atT= 298.15 K andT= 308.15 K

“…The variation of the Kirkwood correlation factor g K which measures the correlation between the orientation or alignment of dipoles of polar associate molecules in binary mixtures (19)(20)(21) is shown as a function of MMA mole fraction in figure 4. The g K values for pure alcohols are found to be greater than unity (greater than 2.0), indicating the presence of linear associates with parallel alignment of dipoles.…”

Study of Kinematic Viscosity, Volatility and Ignition Quality Properties of Butanol/Diesel Blends

“…Figure 1 shows the kinematic viscosity curve behavior of the blends produced with S10 and S500 diesel as a function of the butanol content. It can be noted that the viscosity reduction in blends was not D' Aprano et al (1981) and can be attributed to the 2-methylpropan-1-ol branched chain, which tends to form bulky oligomers between the alcohol molecules with lower flow capacity. The separation between each pair of curves of same diesel matrix exposes the different contribution of each butanol isomer structure on the kinematic viscosity, an effect intensified by the increase of the alcohol content.…”