Use fluorescence spectroscopy to study polymeric materials with porous structure based on imprinting by self-assembled fibrilar networks
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Altres documents de l'autoria: Burguete, M. Isabel; Galindo, Francisco; Gavara, Raquel; Izquierdo Arcusa, María Ángeles; Lima, Joao C.; Luis, Santiago V.; Parola, A. Jorge; Pina, Fernando
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http://dx.doi.org/10.1021/la801342f |
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Títol
Use fluorescence spectroscopy to study polymeric materials with porous structure based on imprinting by self-assembled fibrilar networksAutoria
Data de publicació
2008Editor
American Chemical SocietyISSN
0743-7463Cita bibliogràfica
Langmuir, 24, 17, p. 9795–9803Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.acs.org/doi/abs/10.1021/la801342fParaules clau / Matèries
Resum
Different polymeric materials have been prepared from the organogels formed by a polymerizable methacrylic mixture (methyl methacrylate/ethylene glycol dimethacrylate, 1:1, w/w) and the macrocyclic pseudopeptide 1. ... [+]
Different polymeric materials have been prepared from the organogels formed by a polymerizable methacrylic mixture (methyl methacrylate/ethylene glycol dimethacrylate, 1:1, w/w) and the macrocyclic pseudopeptide 1. The use of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide as a very efficient radical initiator allows polymeric materials in which the structure of the fibrils formed by self-assembly of the organogelator 1 is truly preserved to be obtained. Removal of the pseudopeptidic molecule provides materials with a porous structure reflecting that of the original self-assembled fibrils. The use of fluorescent probes such as rhodamine B and pyrene greatly facilitate the study of the porous structures formed and, accordingly, that of the morphology of the original fibrils. Those studies reveal the presence of a permanent porosity and the organization of the substructures as a porous network. This confirms the existence of a nucleation and growth mechanism for the generation of the fibrils, giving rise to the formation of spherulitic structures. Those spherulites are additionally linked by connections of variable size. A series of diffusion experiments allowed establishment of a direct dependence of the inner porosity of the materials on the amount of self-organizing template used for their preparation. [-]
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