This work focuses on the dynamic phenomena emerging in self-assembled transient intermolecular networks formed when two different surfactants are mixed. In particular, the relaxation processes in liquid mixtures composed by bis(2-ethylhexyl)amine (BEEA) and octanoic acid (OA) in the whole composition range has been investigated by dielectric spectroscopy and Brillouin spectroscopy. A thorough analysis of all the experimental data consistently suggests that, mainly driven by acid-base interactions arising when the two surfactants are mixed, supra-molecular aggregates formation causes the slowing down of molecular dynamics. This, in turn, reflects to longer-range relaxations. These changes have been found to be composition-dependent, involving strong departures of the mixture physico-chemical properties from an ideal behaviour, and reflecting the structural and dynamical features of local structures. In particular, the peculiar dynamic processes occurring in these local inter-molecular structures, have been found to be the factors responsible for the observed and quite surprising increase of direct-current conductivity which occurs when two different (and pretty non-conductive) surfactants are mixed. The discovery can be used not only to design novel materials for application purposes but also to shed more light on the basic principles regulating charge migration in structured liquid systems.
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14 February 2012
Research Article|
February 14 2012
Emerging dynamics in surfactant-based liquid mixtures: Octanoic acid/bis(2-ethylhexyl) amine systems
Pietro Calandra;
Pietro Calandra
a)
1CNR-IPCF, Institute for Physico-Chemical Processes,
National Council of Research–sede di Messina
, Viale Ferdinando Stagno d’Alcontres, n. 37, 98158 Messina, Italy
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Andrea Mandanici;
Andrea Mandanici
b)
2
Physics Department – University of Messina
, Viale Ferdinando Stagno d’Alcontres, 31 - 98166 Messina, Italy
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Vincenzo Turco Liveri;
Vincenzo Turco Liveri
c)
3Chemistry Department “Stanislao Cannizzaro,”
University of Palermo
, Viale delle Scienze I-90128 Palermo, Italy
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Mikolaj Pochylski;
Mikolaj Pochylski
d)
4Faculty of Physics,
Adam Mickiewicz University
, ul. Umultowska 85, Poznan 62-614, Poland
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Francesco Aliotta
Francesco Aliotta
1CNR-IPCF, Institute for Physico-Chemical Processes,
National Council of Research–sede di Messina
, Viale Ferdinando Stagno d’Alcontres, n. 37, 98158 Messina, Italy
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a)
Electronic mail: calandra@me.cnr.it. Tel.: +39 090 39762. Fax: +39 090 3974130.
b)
Electronic mail: amandanici@unime.it. Tel.: +39 090 676 5011.
c)
Electronic mail: turco@unipa.it. Tel.: +39 091 645 9844.
d)
Electronic mail: pochyl@amu.edu.pl. Tel.: +48 61 829 5143.
J. Chem. Phys. 136, 064515 (2012)
Article history
Received:
November 08 2011
Accepted:
January 25 2012
Citation
Pietro Calandra, Andrea Mandanici, Vincenzo Turco Liveri, Mikolaj Pochylski, Francesco Aliotta; Emerging dynamics in surfactant-based liquid mixtures: Octanoic acid/bis(2-ethylhexyl) amine systems. J. Chem. Phys. 14 February 2012; 136 (6): 064515. https://doi.org/10.1063/1.3684713
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