Abstract
Nanoparticulated bimodal mesoporous silicas (NBS) have proved to constitute adequate supports in a variety of applications requiring enhanced accessibility to the active sites. Mass-transfer kinetics seems to be highly favoured in UVM-7-derived NBS materials. To understand the mass-diffusion phenomena throughout UVM-7-like supports requires well-grounded knowledge about their pore architecture. 3-D reconstructions of the UVM-7 mesostructure carried out by electron tomography reveal the existence of a true hierarchic connectivity involving both inter- and intra-nanoparticle pores. This connectivity makes self-supported nanoparticulated mesoporous bimodal carbon replicas of the supports feasible to obtaining by nanocasting. Both the temperature-induced mobility of gold nanodomains and the fast and efficient enzyme adsorption in UVM-7-like silicas are examples of non-constrained diffusion processes happening inside such an open network.
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Acknowledgments
This research was supported by the Ministerio de Educación y Ciencia (MAT2009-14564-C04-04) and the Generalitat Valenciana (PROMETEO/2009/108). J.E.H. thanks the Fundació General de la Universitat de València for financial support. A.M. thanks MEC for a FPI fellowship.
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Pérez-Cabero, M., Hungría, A.B., Morales, J.M. et al. Interconnected mesopores and high accessibility in UVM-7-like silicas. J Nanopart Res 14, 1045 (2012). https://doi.org/10.1007/s11051-012-1045-8
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DOI: https://doi.org/10.1007/s11051-012-1045-8