Observation and reactivity of the chainlike species ([Al(PO4)(2)](3-))(n) during the X-ray diffraction investigation of the hydrothermal synthesis of the super-sodalite sodium aluminophosphate MIL-74 (Na2Al7(PO4)(12)center dot 4trenH(3)center dot Na(H2O)(16))

The hydrothermal synthesis of the aluminum phosphate Na2Al 7(PO4)12•4trenH3•Na(H 2O)16 (MIL-74) has been studied by X-ray diffraction (conventional source) and in-situ time-resolved energy-dispersive X-ray diffraction (synchrotron radiation). Before the crystallization of MIL-74, the reaction of the starting aqueous aluminophosphate gel containing the tren species (tris(2-aminoethyl)amine) and sodium hydroxide gives rise to the formation of a hydrated chainlike solid Al(PO4)2• trenH3•6H2O (phase 1), which transforms into the hydrate Al(PO4)2•trenH3•2.5H 2O (phase 2) upon heating at 180°C. Its structure was determined by means of single-crystal X-ray diffraction and consists of a one-dimensional inorganic chain of tetrahedral unit AlO4 alternating with the phosphate group PO4. The resulting ([Al(PO4) 2]3-)n chains interact through hydrogen bonds with the trenH3) and water molecules, generating a layerlike inorganic-organic network. Phase 2 was observed to be an intermediate, which disappears when the MIL-74 solid starts to crystallize. The observation of such an intermediate phase allows for the proposition of a chemical reaction pathway for the formation of the three-dimensional network of MIL-74. It seems that the sodium cations play a crucial role and directly react with the chainlike precursor. They would participate in the construction of the inorganic framework as anchorage nodes during the condensation process

Multimodal quantification and validation of 3D regional myocardial function

International audienceThe aim of this project is to design a generic formalism for parietal and regional tracking of the left ventricle (LV) and to adapt it to 3D+t3D+t cardiac imaging modalities used in clinical routine (echocardiography, gated-SPECT, cine-MRI). The estimated displacement field must be reliable enough and insensitive to various artifacts to assess regional myocardial function in 3D from the accurate and precise computation of strain. The strain has recently proved to be of great interest for diagnosis and prognostic in cardiology, but its interpretation remains difficult because of the relative nature of the indices. The clinical objective of the 3DStrain project is to bring answers about the knowledge of normality