The mesoscopic morphology of mixtures of ethylammonium nitrate, a protic ionic liquid, and n-pentanol is explored for the first time using small angle X-ray scattering as a function of concentration and temperature. Both compounds are amphiphilic and characterized by an extended hydrogen bonding network; however, though macroscopically homogeneous, their mixtures are highly heterogeneous at the mesoscopic spatial scales. Previous structural studies rationalized similar features in related mixtures proposing the existence of large aggregates or micelle- and/or microemulsion-like structures. Here we show that a detailed analysis of the present concentration and temperature resolved experimental data set supports a structural scenario where the mesoscopic heterogeneities are the due to density fluctuations that are precursors of liquid-liquid phase separation. Accordingly no existence of structurally organized aggregates (such as micellar or microemulsion aggregates) is required to account for the mesoscopic heterogeneities detected in this class of binary mixtures.

Nature of mesoscopic organization in protic ionic liquid-alcohol mixtures / Schroer, W; Triolo, A; Russina, Olga. - In: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL. - ISSN 1520-6106. - ELETTRONICO. - 120:9(2016), pp. 2638-2643. [10.1021/acs.jpcb.6b01422]

Nature of mesoscopic organization in protic ionic liquid-alcohol mixtures

RUSSINA, OLGA
2016

Abstract

The mesoscopic morphology of mixtures of ethylammonium nitrate, a protic ionic liquid, and n-pentanol is explored for the first time using small angle X-ray scattering as a function of concentration and temperature. Both compounds are amphiphilic and characterized by an extended hydrogen bonding network; however, though macroscopically homogeneous, their mixtures are highly heterogeneous at the mesoscopic spatial scales. Previous structural studies rationalized similar features in related mixtures proposing the existence of large aggregates or micelle- and/or microemulsion-like structures. Here we show that a detailed analysis of the present concentration and temperature resolved experimental data set supports a structural scenario where the mesoscopic heterogeneities are the due to density fluctuations that are precursors of liquid-liquid phase separation. Accordingly no existence of structurally organized aggregates (such as micellar or microemulsion aggregates) is required to account for the mesoscopic heterogeneities detected in this class of binary mixtures.
2016
X-ray-scattering; nitrate-N-octanol; hydrogen-bonded interactions; Kirkwood-Buff parameters; dynamic light-scattering; tert-butyl alcohol; room-temperature; ethylammonium nitrate; phase-behavior; water mixtures
01 Pubblicazione su rivista::01a Articolo in rivista
Nature of mesoscopic organization in protic ionic liquid-alcohol mixtures / Schroer, W; Triolo, A; Russina, Olga. - In: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL. - ISSN 1520-6106. - ELETTRONICO. - 120:9(2016), pp. 2638-2643. [10.1021/acs.jpcb.6b01422]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/946365
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