Chemical modification of high-quality large-pore M41S materials

Surface modification of as-synthesized lamellar mesostructured silica obtained by liquid crystal templating

“…22,23 A sample of substrate obtained in the TEOS/2ÂC 18 /acid was characterized by Si MAS-NMR, before and after silylating. 24 Fig .…”

Sulfonic Acid-Functionalized Inorganic Materials as Efficient Catalysts in Various Applications: A Minireview

“…The replacement of organic propyl linker with the phenyl groups allowed production of a more stable sulfonic acid catalyst towards its deactivation due to the leaching of -SO 3 H group provoked by the water present in the reaction media. Lindlar et al [11] reported the synthesis of arenesulfonic MCM-41 4 following a multistep approach. (see Figure 2) The grafting of phenyl groups to the silica surface was performed either by gas-phase or liquid-phase reaction.…”

“…In addition to the changes in proportion between these peaks, when functionalized, a new set of peaks in the range {−45;−80} ppm appears giving evidence for the covalent incorporation of the functional groups. The peaks correspond to three different environments for the siloxanes groups: T 1 , T 2 , and T 3 assigned respectively to [T m = RSi(OSi) m (OMe) 3-m ] [11,13,[81][82][83][84][85]. Khrisna et al [86], for example, attribute the presence of more T 3 species in RSO 3 H-MCM-41 compared to RSO 3 H-SBA-15 to a higher number of Q 3 in the bare MCM-41 precursor indicating a more efficient condensation.…”

Metalorganic modification of periodic mesoporous silica: aromatic nitrogen functionalities

“…5,6 In this way a variety of organic functionalities such as amines, mercaptans or alkylhalogenides could be introduced into the porous structure. [7][8][9] However, only a limited number of chloro-and alkoxysilanes are commercially available, therefore new functionalities could require the expensive synthesis of new organosilanes in the laboratory, for example by hydrosilylation. 10,11 It would be highly desirable to determine a broad spectrum of functionalities for the construction of complex porous nanostructures for applications in catalysis, sensors, ultrafiltration, chromatography, and the encapsulation of drugs.…”