University of Lorraine

About: University of Lorraine is a education organization based out in Nancy, France. It is known for research contribution in the topics: Population & Context (language use). The organization has 11942 authors who have published 25010 publications receiving 425227 citations. The organization is also known as: Lorraine University.

New Insight into the Topology of Excited States through Detachment/Attachment Density Matrices-Based Centroids of Charge.

Abstract: In parallel with the derivation of a novel descriptor (ϕS) related to chromophores’ electronic excited states topology, the present article emphasizes some congruence of significance between our ϕS index and formerly developed centroid-related indices. We especially point out the possibility to formally adapt a barycenter (centroid) approach to the use of detachment/attachment densities. While the reciprocity of the two approaches can be mathematically evidenced, we will show that some difficulties brought by the use of ground and excited states electron densities in direct space can be overcome by undertaking some operations on the Hilbert space-related detachment/attachment matrices. We further wish to point out the crucial case of some chromophores holding two electron-withdrawing groups symmetrically disposed in a rod-like structure. Finally, we will qualitatively highlight the quadratic-like relationship between the amount of displaced charge induced by light absorption and the ϕS index.

Two‐Photon Excitation of Porphyrin‐Functionalized Porous Silicon Nanoparticles for Photodynamic Therapy

Abstract: Porous silicon nanoparticles (pSiNPs) act as a sensitizer for the 2-photon excitation of a pendant porphyrin using NIR laser light, for imaging and photodynamic therapy. Mannose-functionalized pSiNPs can be vectorized to MCF-7 human breast cancer cells through a mannose receptor-mediated endocytosis mechanism to provide a 3-fold enhancement of the 2-photon PDT effect.

Experimental study of spin-wave dispersion in Py/Pt film structures in the presence of an interface Dzyaloshinskii-Moriya interaction

Abstract: Brillouin light scattering (BLS), complemented by ferromagnetic resonance (FMR) characterization, has been used for studying spin-wave (SW) propagation in $\mathrm{Py}(L)/\mathrm{Pt}(6\text{\ensuremath{-}}\mathrm{nm})$ bilayers of various Py thicknesses $(4\phantom{\rule{0.16em}{0ex}}\mathrm{nm}\ensuremath{\le}L\ensuremath{\le}10\phantom{\rule{0.16em}{0ex}}\mathrm{nm})$. The FMR measurements allowed determination of the pertinent magnetic parameters and revealed the existence of a normal surface anisotropy. A pronounced asymmetry of Damon-Eshbach (DE) wave frequencies has been evidenced by BLS. Therefore, the difference between Stokes and anti-Stokes DE frequencies has been measured versus SW wave number for all the samples. A detailed discussion about the origin of this frequency difference is reported, which concludes that this is due to interface Dzyaloshinskii-Moriya interaction (IDMI).

Mesoporous Silica Thin Films for Improved Electrochemical Detection of Paraquat.

Abstract: An electrochemical method was developed for rapid and sensitive detection of the herbicide paraquat in aqueous samples using mesoporous silica thin film modified glassy carbon electrodes (GCE). Vertically-aligned mesoporous silica thin films were deposited onto GCE by electrochemically assisted self-assembly (EASA). Cyclic voltammetry revealed effective response to the cationic analyte (while rejecting anions) thanks to the charge selectivity exhibited by the negatively-charged mesoporous channels. Square wave voltametry (SWV) was then used to detect paraquat via its one electron reduction process. Influence of various experimental parameters (i.e. pH, electrolyte concentration and nature of electrolyte anions) on sensitivity was investigated and discussed with respect to the mesopores characteristics and accumulation efficiency, pointing out the key role of charge distribution in such confined spaces on these processes. Calibration plots for paraquat concentration ranging from 10 nM - 10 µM were construc...