Publicaciones 2011-2020

@article{RN325,
title = {Composition Effect on the Aggregate/Solution Interface of a Nematic Lyotropic Liquid Crystal},
author = { A. Ruiz-Fernandez and J.J. Lopez-Cascales and J.J. Giner-Casares and R. Araya-Maturana and F.G. Diaz-Banose and B. Weiss-Lopez},
url = {/brokenurl#<Go to ISI>://WOS:000384139000097},
doi = {10.1039/c6ra13597h},
issn = {2046-2069},
year = {2016},
date = {2016-01-01},
journal = {Rsc Advances},
volume = {6},
number = {88},
pages = {85411-85419},
abstract = {Lyotropic nematic liquid crystals (lnlc) have attracted attention due to their resemblance to natural membranes and several technological applications. The effect of tetradecyltrimethyl ammonium chloride (TTAC) in the viscosity of a new lnlc containing also decanol, NaCl and natural lipids, was studied. In this article we study how the concentration of phospholipids, decanol and NaCl affects the bilayer and the liquid crystal/solution interface structures. H-2-NMR quadrupole splittings and longitudinal relaxation times of several deuterated species were measured. Polarized light microscopy, transmission electron microscopy and kinematic viscosity measurements were also obtained. The structure of the bilayer is dominated by the surface charge density of TTAC. Water rotation, translation and ion solvation depend on the charge and distance from the interface. With increasing TTAC, MD predicts hydrocarbon chain inter-digitation and lipid rafts formation. This was rationalized using energy arguments.},
keywords = {aqueous-solutions, chloride-ions, coefficients, diffraction ewald, free-energy, lipid-bilayers, mesh molecular-dynamics, particle self-diffusion simulation, water},
pubstate = {published},
tppubtype = {article}
}

@article{RN134,
title = {Electron Paramagnetic Resonance Study of Copper-Ethylenediamine Complex Ion Intercalated in Bentonite},
author = { J.P. Donoso and C.J. Magon and J.F. Lima and O.R. Nascimento and E. Benavente and M. Moreno and G. Gonz\'{a}lez},
url = {/brokenurl#<Go to ISI>://WOS:000327110500067},
doi = {10.1021/jp408658d},
issn = {1932-7447},
year = {2013},
date = {2013-01-01},
journal = {Journal of Physical Chemistry C},
volume = {117},
number = {45},
pages = {24042-24055},
abstract = {This work reports on studies of two-dimensional networks of Cu2+ ions, built by exchanging Na-bentonite with Cu2+ aqueous or with the bis(ethylenecliamine) complex, [Cu(C2H4 (NH2))(2)](2+), at different concentrations of the paramagnetic center. Dilution of the magnetically active species is performed by the cointercalation of analogous diamagnetic zinc species, aqueous Zn2+, or complexed [Zn(C2H4 (NH2))(2)](2+) ions, with ethylenediamine in excess. Materials were characterized by X-ray diffraction, Fourier transform infrared (FT-IR) and UV-visible spectroscopy, and continuous-wave electron paramagnetic resonance (EPR). X-ray diffraction measurements indicated that the interlaminar distance in the bentonite decreases with the increase of Zn concentration in the composites. The observation of a two-component Cu2+ EPR spectrum imply the coexistence of isolated Cu2+ with a well-resolved hyperfine structure and spin-spin exchanged Cu2+ dimers or clusters with an unresolved hyperfine structure. EPR spin Hamiltonian parameters of the isolated species in Cu/ethylenediamine intercalated samples are typical of axially distorted sites, six-coordinated with bis(ethylenediamine) in the equatorial plane and with oxygen on the internal surfaces of the clay. Experimental facts indicate that the interaction between paramagnetic centers is mainly favored by two different phenomena: turbostratic disorder of clay sheets and segregation of the magnetic centers leading to interstratifications of layers.},
keywords = {aqueous-solutions, characterization, clay, cupric ion, magnetic-resonance, montmorillonite solid-surfaces, spectroscopic spin-resonance, thermal-stability},
pubstate = {published},
tppubtype = {article}
}