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MCM-41
About: MCM-41 is a research topic. Over the lifetime, 2355 publications have been published within this topic receiving 91416 citations.
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TL;DR: In this paper, the mesoporous V-Mo-MCM-41 with Si/(V+Mo) ratio equal to 46, 92, 184 and 230 were synthesized using cetyltrimethylammonium bromide surfactant as template under hydrothermal conditions.
30 citations
TL;DR: In this paper, a mesoporous silica MCM-41 supported Ni-based catalysts were prepared by glucose and β-cyclodextrin (βCD) modified impregnation method, respectively.
30 citations
TL;DR: In this paper, purely siliceous MCM41 and Al-containing MCM-41 mesoporous materials were synthesized by non-hydrothermal method in alkali-free ions medium at room temperature and short reaction times.
Abstract: Purely siliceous MCM-41 and Al-containing MCM-41 (Al-MCM-41) mesoporous materials were synthesized by non-hydrothermal method in alkali-free ions medium at room temperature and short reaction times. Under these synthesis conditions, it was also investigated the influence of Al incorporation in the crystal structure of MCM-41. The solids were characterized by ICP-OES, AAS, N2 adsorption at 77 K, XRD, TEM, NH3-TPD, 27Al and 29Si-MAS-NMR, FT-IR and TGA. The resulting mesoporous materials showed a well-defined hexagonally ordered pore geometry maintaining a uniform and unimodal pore size distribution with high specific surface areas (1000-1400 m2g-1). The Al+3 ions were introduced successfully in the structure of the purely siliceous MCM-41 expanding the unit cell parameter and forming four-coordinated Al species, and in a less extent, forming six-coordinated Al species. In addition, the surface acidity of the MCM-41 increased with Al loading. Contrary, the presence of Al in the MCM-41 mesoporous structure resulted in a decrease of the crystallinity and specific surface area possibly due to the presence of Al species in highly distorted tetrahedral structures and Al extra-framework or amorphous alumina occluded in the pores. The MCM-41 type mesoporous materials obtained in this work show similar characteristics of those synthesized by conventional hydrothermal methods.
30 citations
TL;DR: The synthesis and characterization of a fluorescent hybrid mesoporous silica nanomaterial, which is noncytotoxic and shows great potential for "in-cell" bioimaging applications, will be described.
Abstract: Mesoporous silica nanoparticles are being explored as versatile tools for various biomedical and biotechnological applications including disease diagnosis, drug delivery, and intracellular imaging. In this paper, the synthesis and characterization of a fluorescent hybrid mesoporous silica nanomaterial, which is noncytotoxic and shows great potential for “in-cell” bioimaging applications, will be described. The hybrid mesoporous material has been obtained by confining highly fluorescent organic dyes, belonging to the indocyanine family, within the channels of mesoporous MCM-41. To explore the dispersion of the dye inside the mesoporous channels and the formation of dye aggregates, several hybrid samples with increasing dye/MCM-41 loading (up to 100 mg/g) were prepared. A uniform distribution of monomeric 1,1′-diethyl-3,3,3′,3′-tetramethylindocarbocyanine iodide has been achieved at low dye loading (1 mg/g), as evidenced by photoluminescence spectra and lifetime, while a progressive formation of J-aggregate...
30 citations
TL;DR: In this article, a series of alanine-salicylaldehyde Schiff base chromium (III) complexes were shown to be promising catalysts for the epoxidation of styrene with 30% hydrogen peroxide.
Abstract: Alanine–salicylaldehyde Schiff base chromium (III) complex was immobilized on mesoporous silica gel (SiO2), MCM-41 and SBA-15. The resulting immobilized complexes were promising catalysts for the epoxidation of styrene with 30% hydrogen peroxide, and they all showed much higher catalytic performance than their homogeneous analogue. Simultaneously, the catalytic performance of immobilized complexes was found to be closely related to the textual and surface properties of the supports used. The complex immobilized on methyl-containing MCM-41 exhibited the highest catalytic performance. Under optimal reaction conditions, the highest conversion of styrene reached 80.2% with 77.0% selectivity to epoxide. In addition, the catalytic performance remained stable after six times of recycling. A series of immobilized alanine–salicylaldehyde Schiff base chromium (III) complexes were promising catalysts for the epoxidation of styrene with 30% hydrogen peroxide. Moreover, the different textural and surface properties of supports significantly influenced their catalytic performance.
30 citations