Self-assembly in surfactant-based liquid mixtures: bis(2-ethylhexyl)phosphoric acid/bis(2-ethylhexyl)amine systems.

Pietro Calandra, Angela Ruggirello, Andrea Mele, Vincenzo Turco Liveri

文献索引：J. Colloid. Interface Sci. 348(1) , 183-8, (2010)

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摘要

Surfactant-based liquid mixtures constitute an interesting class of nanostructured materials with promising potential in specialized applications. Here, structural and conductometric properties of liquid mixtures composed of bis(2-ethylhexyl)amine (BEEA) and bis(2-ethylhexyl)phosphoric acid (HDEHP) have been thoroughly investigated with the aim to correlate structural features with system charge transport capability. The evolution of self-assembled local nanostructures with system composition has been investigated by FT-IR and XRD while the conductometric properties were probed by conventional AC complex impedance. Both pure components exhibit nano-segregation due to their amphiphilic nature but with only very low proton conductivities. However their mixtures, characterized by local organization of polar and apolar domains driven by acid-base interactions between HDEHP PO(4)H and BEEA NH groups, show enhanced structural order and proton conductivity.Copyright (c) 2010 Elsevier Inc. All rights reserved.