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Lifshitz phase: the microscopic structure of aqueous and ethanol mixtures of 1, n-diols (CROSBI ID 240874)

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Požar, Martina ; Perera, Aurélien Lifshitz phase: the microscopic structure of aqueous and ethanol mixtures of 1, n-diols // PCCP. Physical chemistry chemical physics, 19 (2017), 23; 14992-15004. doi: 10.1039/C7CP01949A

Podaci o odgovornosti

Požar, Martina ; Perera, Aurélien

engleski

Lifshitz phase: the microscopic structure of aqueous and ethanol mixtures of 1, n-diols

We study binary mixtures of ethylene glycol and 1, 3-propandiol with water or ethanol using computer simulations. Despite strong hydrogen bonding tendencies between all these molecules, we find that these mixtures are surprisingly homogeneous, in contrast to the strong micro- heterogeneity found in aqueous ethanol mixtures. The aqueous diol mixtures are found to be close to ideal mixtures, with near-ideal Kirkwood–Buff integrals. Ethanol–diol mixtures show weak non-ideality. The origin of this unexpected randomness is due to the fact that the two hydrogen bonding hydroxyl groups of the 1, n-diol are bound by the neutral alkyl bond, which prevents the micro-segregation of the different types of hydroxyl groups. These findings suggest that random disorder can arise in the presence of strong interactions – in contrast to the usual picture of random disorder due to weak interactions between the components. They point to the important role of molecular topology in tuning concentration fluctuations in complex liquids. We propose and justify herein the name of Lifshitz phases to designate such types of disordered systems.

binary mixtures ; diols ; diol alcohols ; computer simulation ; lifshitz phase

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Podaci o izdanju

19 (23)

2017.

14992-15004

objavljeno

1463-9076

10.1039/C7CP01949A

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Fizika

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