Mesoporous Silica Matrix as a Tool for Minimizing Dipolar Interactions in NiFe₂O₄ and ZnFe₂O₄ Nanoparticles.

NiFe₂O₄ and ZnFe₂O₄ nanoparticles have been prepared encased in the MCM (Mobile Composition of Matter) type matrix. Their magnetic behavior has been studied and compared with that corresponding to particles of the same composition and of a similar size (prepared and embedded in amorphous silica or as bare particles). This study has allowed elucidation of the role exerted by the matrix and interparticle interactions in the magnetic behavior of each ferrite system.

High-pressure synthesis, structural and complex magnetic properties of the ordered double perovskite Pb2NiReO6.

The ordered double perovskite Pb2NiReO6 has been prepared at 6 GPa and temperatures ranging from 1273 to 1373 K. Its crystal structure determined by X-ray powder diffraction and selected area electron diffraction shows monoclinic symmetry with centrosymmetric space group I2/m (a = 5.6021(1) Å, b = 5.

Effect of the template and functional monomer on the textural properties of molecularly imprinted polymers.

Molecularly imprinted polymers (MIPs) for zearalenone analysis have been synthesized using the template mimics cyclododecyl 2,4-dihydroxybenzoate (CDHB), resorcinol and resorcylic acid. The MIPs are photochemically prepared from 2-(diethylamino)ethyl methacrylate (2-DAEM), 4-vinylpyridine (VIPY), 2-hydroxyethyl methacrylate (HEMA) or 1-allylpiperazine (1-ALPP) as the functional monomers, trimethylolpropane trimethacrylate (TRIM) as cross-linker, azobis(isobutyronitrile) as initiator and acetonitrile as porogen. Non-imprinted polymers have been also synthesized for reference purposes.