TY - JOUR
T1 - Bis(2-ethylhexyl)phosphoric acid/bis(2-ethylhexyl)amine mixtures assolvent media for lithium-ions: A dynamical study
AU - Turco Liveri, Vincenzo
AU - Simari, Cataldo
AU - Oliviero Rossi, Cesare
AU - Oliviero Rossi, Cesare
AU - Oliviero Rossi, Cesare
AU - Oliviero Rossi, Cesare
AU - Nicotera, Isabella
AU - Calandra, Pietro
PY - 2015
Y1 - 2015
N2 - tThe self-diffusion coefficient, the spin-lattice relaxation times and ionic conductivity of lithium ions in liq-uid mixtures composed of bis(2-ethylhexyl)amine (BEEA) and bis(2-ethylhexyl)phosphoric acid (HDEHP)have been thoroughly investigated as a function of composition and temperature by NMR spectroscopyand conductometry. While the temperature and composition dependence of diffusion coefficients oflithium ions follow the same trend observed for those of the surfactant molecules, the spin-lattice relax-ation times of lithium ions and1H are remarkably different. The observed behavior has been interpretedin terms of lithium ions diffusion occurring through its association with the negatively charged HDEHPspecies, whereas its rotational dynamics being decoupled from that of surfactant molecules, gives T1val-ues lower than those of surfactant molecules and characterized by a different temperature dependence.
AB - tThe self-diffusion coefficient, the spin-lattice relaxation times and ionic conductivity of lithium ions in liq-uid mixtures composed of bis(2-ethylhexyl)amine (BEEA) and bis(2-ethylhexyl)phosphoric acid (HDEHP)have been thoroughly investigated as a function of composition and temperature by NMR spectroscopyand conductometry. While the temperature and composition dependence of diffusion coefficients oflithium ions follow the same trend observed for those of the surfactant molecules, the spin-lattice relax-ation times of lithium ions and1H are remarkably different. The observed behavior has been interpretedin terms of lithium ions diffusion occurring through its association with the negatively charged HDEHPspecies, whereas its rotational dynamics being decoupled from that of surfactant molecules, gives T1val-ues lower than those of surfactant molecules and characterized by a different temperature dependence.
KW - Spin-lattice relaxation timeSelf-diffusion coefficientsSurfactantsLithium ion
KW - Spin-lattice relaxation timeSelf-diffusion coefficientsSurfactantsLithium ion
UR - http://hdl.handle.net/10447/161786
M3 - Article
SN - 0927-7757
VL - 489
SP - 447
EP - 453
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
ER -