0000000001313205
AUTHOR
Guillaume Maurin
Controlled Transdermal Release of Antioxidant Ferulate by a Porous Sc(III) MOF
Summary The Sc(III) MOF-type MFM-300(Sc) is demonstrated in this study to be stable under physiological conditions (PBS), biocompatible (to human skin cells), and an efficient drug carrier for the long-term controlled release (through human skin) of antioxidant ferulate. MFM-300(Sc) also preserves the antioxidant pharmacological effects of ferulate while enhancing the bio-preservation of dermal skin fibroblasts, during the delivery process. These discoveries pave the way toward the extended use of Sc(III)-based MOFs as drug delivery systems (DDSs).
Symmetry breakings in a metal organic framework with a confined guest
The MOF $[{\text{Fe(tvp)}}_{2}{(\text{NCS})}_{2}]\ifmmode\cdot\else\textperiodcentered\fi{}2\text{BzCHO}$ is demonstrated to undergo a complex sequence of phase transitions and spin-crossover behavior of its constitutive ${\text{Fe}}^{\text{II}}$ ions upon adsorption of benzaldehyde guest molecules. Our study, combining Raman and synchrotron x-ray diffraction measurements on a single crystal, reveals that the conversion from the pure high-spin to the pure low-spin phases implies a rich sequence of intermediate phases, with symmetry breaking forming at least three different space groups. These different symmetries involve spin-state ordering, ligand ordering, and guest ordering, interpreted …
Modelling of the cation motions in complex system: case of Na-mordenites
Abstract Semi-empirical inter-atomic potentials and Monte Carlo algorithms are proposed to predict the evolution of the interaction energy between sodium ions and a mordenite type aluminosilicate network as a function of Si/Al ratio. This result is favourably compared with the activation energy barriers for Na + `jumps' responsible for the polarization change, measured by thermally stimulated current (TSC) spectroscopy, for Na-mordenites characterized by Si/Al ratios ranged from 5.5 to 12. Finally, we propose a possible mechanism for the cation motions, which involves activation barriers within the same order of magnitude than those measured by TSC.
Cations mobility and water adsorption in zeolites
As already pointed out [1], dielectric relaxation spectroscopy can be a convenient tool for probing ion dynamic in solids which depends on i) the structure in which ions are embedded and ii) the nature of the interaction ion/network. Consequently, the results obtained from this technique can be used as a data base for theoretical studies which goal is to calculate the ion binding energy and to simulate ionic displacements. Inversely, theoretical calculations are essential for confirming the experimental data and more particularly the method which is used for analysing the dielectric experimental response.
Static and Dynamic Properties of the Nonframework Cations in Na-Mordenites Zeolite
This work consists of exploring the effect of Si/Al ratio and water content on both the static and dynamic properties of the extra-framework cations in a typical zeolite system Na+-Mordenites. Atomistic simulations based on interatomic potentials and minimisation techniques have been used to determine the location of the cations as a function of the Si/Al ratio and the hydration level. Our calculations showed two different cation behaviours depending on the type of channels that they occupy, the positions of the cations in the main channels being substantially perturbed upon the sorption of water molecules whereas those of the cations located in the small side channels being only slightly s…
CCDC 1970081: Experimental Crystal Structure Determination
Related Article: Céline Mariette, Elzbieta Trzop, Jean-Yves Mevellec, Abdou Boucekkine, Aziz Ghoufi, Guillaume Maurin, Eric Collet, M. Carmen Muñoz, José Antonio Real, Bertrand Toudic|2020|Physical Review B: covering condensed matter and materials physics|101|134103|doi:10.1103/PhysRevB.101.134103
CCDC 1970080: Experimental Crystal Structure Determination
Related Article: Céline Mariette, Elzbieta Trzop, Jean-Yves Mevellec, Abdou Boucekkine, Aziz Ghoufi, Guillaume Maurin, Eric Collet, M. Carmen Muñoz, José Antonio Real, Bertrand Toudic|2020|Physical Review B: covering condensed matter and materials physics|101|134103|doi:10.1103/PhysRevB.101.134103
CCDC 1970083: Experimental Crystal Structure Determination
Related Article: Céline Mariette, Elzbieta Trzop, Jean-Yves Mevellec, Abdou Boucekkine, Aziz Ghoufi, Guillaume Maurin, Eric Collet, M. Carmen Muñoz, José Antonio Real, Bertrand Toudic|2020|Physical Review B: covering condensed matter and materials physics|101|134103|doi:10.1103/PhysRevB.101.134103
CCDC 1970082: Experimental Crystal Structure Determination
Related Article: Céline Mariette, Elzbieta Trzop, Jean-Yves Mevellec, Abdou Boucekkine, Aziz Ghoufi, Guillaume Maurin, Eric Collet, M. Carmen Muñoz, José Antonio Real, Bertrand Toudic|2020|Physical Review B: covering condensed matter and materials physics|101|134103|doi:10.1103/PhysRevB.101.134103