Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 124, Issue 19, Pages 3954-3961Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.9b12025
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Funding
- French National Agency for Research under project PROfILE [ANR-17-CE29-0009]
- Research Federation AndreMarie Ampere (FRAMA)
- FCT under IL4Energy project (FCT) [02/SAICT/2017]
- FCT under IL4Energy project (European Funds for regional development (FEDER) through the operational program of competitiveness and internationalization) [02/SAICT/2017, POCI-01-0145-FEDER-032294]
- FCT [QUI/UI0081/2019, SFRH/BPD/89752/2012, SFRH/BSAB/150320/2019]
- Agence Nationale de la Recherche (ANR) [ANR-17-CE29-0009] Funding Source: Agence Nationale de la Recherche (ANR)
- Fundação para a Ciência e a Tecnologia [SFRH/BSAB/150320/2019] Funding Source: FCT
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The air-ionic liquid interface for a series of ionic liquids involving imidazolium cations [C(n)mim] with different alkyl chain lengths (n = 2, 4, 6, 8, 10, and 12) and the same [NTf2] imide anion has been studied by polarization-resolved second harmonic generation (SHG). An increase as a function of the alkyl chain length of the orientational parameter reveals the increasing ordering of the air-pure ionic liquid interfaces although it is not possible to disentangle the change in mean tilt angle from a change in the tilt angle probability distribution width. Besides, the study of the air-mixed ([C(12)mim])(x)([C(2)mim])(1-x)[NTf2] ionic liquid interface clearly demonstrates the interfacial nonideality of the mixed ionic liquids. The long alkyl chain cation perturbs the interface as seen from the orientational parameter and displaces the short alkyl chain one for bulk mixture contents as low as 10%. At higher long alkyl chain cation bulk mixture contents, the interface behaves close to a pure long alkyl chain ionic liquid.
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