First Eu 3+ @Organo-Si(HIPE) Hybrid Macro-Mesocellular Foams Generation and Associated Luminescent Properties
- PDF / 2,034,316 Bytes
- 6 Pages / 595 x 842 pts (A4) Page_size
- 74 Downloads / 164 Views
1111-D04-15
First Eu3+@Organo-Si(HIPE) Hybrid Macro-Mesocellular Foams Generation and Associated Luminescent Properties Nicolas Brun1,5, Béatriz Julian-Lopez2, Peter Hesemann3, Guillaume Laurent4, Hervé Deleuze5, Clément Sanchez4, Marie-France Achard1, Annick Babeau1 and Rénal Backov1 1
Centre de Recherche Paul Pascal UPR 8641 CNRS, PESSAC, France. Departamento de Química Inorgánica y Orgánica ESTCE Universitat Jaume I, CASTELLÓN, Spain. 3 Institut Charles Gerhardt UMR 5253 Ecole Nationale Supérieure de Chimie, MONTPELLIER, France. 4 Laboratoire de Chimie de la Matière Condensée de Paris UMR 7574 CNRS Université Pierre et Marie Curie, PARIS, France. 5 Institut des Sciences Moléculaires UMR 5255 CNRS Université Bordeaux 1, TALENCE, France. 2
ABSTRACT Using both β-diketone and malonamide organosilane derivatives and silica Si-HIPE macro-mesocellular foams (acronym refers to the High Internal Phase Emulsion process [1]), organically modified silicates (ORMOSILs) with chelating functionality have been synthesized. The organic functionalities have been anchored to the silica porous networks by both a two-steps grafting method, relating to grafted gOrgano-Si(HIPE), and a one-step co-condensation process, relating to Organo-Si(HIPE). The loading of monoliths by lanthanides was performed by impregnation of an europium (III) salt in solution, leading to a new Eu3+@(g)Organo-Si(HIPE) hybrid foams series. The resulting materials have been thoroughly characterized via a large set of techniques such as SEM, TEM, SAXS, mercury intrusion porosimetry, nitrogen adsorption, FTIR and 29Si CP MAS NMR. Luminescence behavior of this Eu3+@Organo-Si(HIPE) series was also studied and the effects of environment and europium concentration will be discussed.
INTRODUCTION Designing new porous materials in a monolithic form with framework involving hierarchical pore system and tailored macropore morphologies is an emerging area of technological interest toward heterogeneous catalysis, separation techniques, absorbers, sensors, optics etc. In this direction, bio-inspired approach [2] has open new chemical strategies by combining sol-gel or mineralization processes with templated growth, with a view to develop innovative materials offering complex architectures. Current approaches to hierarchically structured inorganic materials include coupling of multiscale templating, that makes the use of both self-assembled surfactant and larger templates such as gas bubbles in air-liquid foams [3], emulsion droplets [4], latex beads [5] and so forth. Recently, has emerged the concept of “integrative chemistry” [6], where chemistry and process are strongly coupled. This new concept allows the pre-dictated assembling of a large variety of molecular precursors or nanobuilding blocks into engineered hierarchical structures. With this aim, our research group has developed a way to obtain macrocellular silica monoliths, labelled “Si-HIPE”, with a high control on the final
macroscopic cell sizes and morphologies, by using concentrated direct emulsion and lyot
Data Loading...
