Organosilica Nanoparticles with Ordered Trimodal Porosity and Selectively Functionalized Mesopores

Abstract

Dedicated to Prof. Dr. rer. nat. Ju ¨rgen Caro on the occasion of his 70th birthday Selective functionalization of hierarchical porous materials is of outmost importance for many different applications. A major problem of the functionalization arises from the functionalization process itself. A novel gas phase functionalization was used to modify the surface of newly developed inorganic-organic hybrid nanomaterials with hierarchical trimodal porosity, using 3-mercaptopropyltrimethoxysilane (MPTMS). It was found that the functionalization of mesopores of the material is possible, while the micropores of the material stay selectively non-functionalized after oxidation. Interestingly, the initial mesopores of the material are selectively modified, up to a degree that can be reached usually only by co-condensation approaches, which are however difficult to perform on PMO-derived porous materials.

Unravelling the structure of CO2 in silica adsorbents: an NMR and computational perspective

“…CO 2 speciation studies NMR spectroscopy has been widely employed to probe the local structure and dynamics of both the host framework and adsorbed guest molecules within porous materials. 28,[61][62][63][64][65][66][67][68] In the last few years, ssNMR has become the technique of choice to investigate the nature of CO 2 species formed in AMPS materials, mostly under dry conditions. 50,51,61,63,[69][70][71][72][73][74] Traditionally, CO 2 speciation studies arising from chemisorption exploit chemical shift (CS) analysis that can be performed with accuracy in combination with computer modelling.…”