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• W2021814092 abstract "Mandelstam-Brillouin scattering data in mixed isomeric alcohols n-pentanol (nPe-OH) and 2-methyl-2-butanol (2Me-2BuOH) are presented. The hypersonic velocity and normalized absorption are measured as a function of the scattering angle, in the temperature range from -15°C to +45°C, and as a function of n-PeOH molar fraction going from the pure n-PeOH to the pure 2Me-2BuOH. The experimental results confirm the existence of a shear relaxation phenomenon in the GHz region, that has been previously detected in pure liquids. The temperature dependence of the relaxation time τs and of the shear modulus G ∞ evaluated within viscoelastic liquid models, support the existence of open heterostructures in the 2-methyl-2-butanol rich phase. A detailed analysis is also carried out for the measured shear viscosity ηs, whose temperature dependence becomes more and more non-Arrhenian by adding normal pentanol (n-PeOH) to its stereoisomer (2Me-2BuOH). A comparison between the shear flow mean activation enthalpy and the high frequency shear relaxation enthalpy allows us to demonstrate the more ‘fragile’ behaviour of 2Me-2BuOH and of its more concentrated mixtures with respect to that of n-PeOH, confirming that the observed non-ideal behaviour in the mixing process can be associated with the existence of H-bond imposed structural aggregates that are in dynamic equilibrium." @default.
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• W2021814092 date "1991-05-01" @default.
• W2021814092 modified "2023-09-22" @default.
• W2021814092 title "Relaxation phenomena in mixed isomeric alcohols by Mandelstam-Brillouin scattering" @default.
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• W2021814092 doi "https://doi.org/10.1080/00268979100101031" @default.
• W2021814092 hasPublicationYear "1991" @default.
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