MCM-41 based catalysts (molar ratio Si/Al = 40) were prepared by a hydrothermal route, modified ionic exchange with different metals (Cu, Cr, Fe and Zn) finally calcined at 550 °C. The fully characterized techniques that confirmed the formation of oxides on surfaces all materials. Low-angle X-ray diffraction (XRD) analyses showed calcination resulted in incorporation metallic Zn, Cr framework M...

A mesoporous silica-based inorganic-organic hybrid material (NBD-AP-MCM) has been designed and developed as a fluorescent chemosensor for the detection of fluoride in aqueous medium. The system was developed by covalently anchoring 7-nitro-2,1,3-benzoxadiazole (NBD) dye onto the surface of mesoporous silica nanoparticles, MCM-41. The system was characterized using several conventional analytica...

We investigated the translational and rotational dynamics of water molecules in mesoporous silica materials MCM-41-S and MCM-48-S using the incoherent quasielastic neutron scattering technique. The range of wave vector transfers Q covered in the measurements was from 0.27 to 1.93 Å broad enough to detect both the translational and rotational contributions to the scattering. We used the relaxing...

A Mobil Composition of Matter (MCM)-41 type mesoporous silica material containing N-propylacridone groups has been successfully prepared by co-condensation of an appropriate organic precursor with tetraethyl orthosilicate (TEOS) under alkaline sol-gel conditions. The resulting material was fully characterized by means of X-ray diffraction (XRD), N(2)-adsorption-desorption, transmission electron...

Biginelli reactions were well catalyzed on mesoporous silica MCM-41 (M41) whose activity was much greater than that of amorphous silica. Octane was the most suitable among 6 kinds of solvents examined. The addition of metal ions on M41 enhanced the catalytic activity in the order Al > Ti > Fe = In. Al-planted M41s with Si/Al ratios of 45-35 showed the highest catalytic activity and could be use...

1. Introduction Recent progress in the synthesis of nanoporous materials with controlled structural properties made it possible to address various phenomena occurring in mesoscalic molecular systems. Among them, different aspects of fluid phase transitions could now be related to the structural properties of mesoporous matrices. In particular, porous materials with well-defined pore geometries ...

A mixed amine pyridine polydentate Fe(II) complex was covalently tethered in hexagonal mesoporous silica of the MCM-41 type. Metal site isolation was generated using adsorbed tetramethylammonium cations acting as a patterned silanol protecting mask and trimethylsilylazane as a capping agent. Then, the amine/pyridine ligand bearing a tethering triethoxysilane group was either grafted to such a p...

Rhodamine B (RhB) in dyes is widely used various industries, but it poses a great threat to the natural environment and human health. In this work, series of thermosensitive polymer materials, PNxDy, with controllable morphology particle size were prepared by free radical polymerization using N-isopropylacrylamide N,N-dimethylacrylamide as monomers. Then, PNxDy template, bimetallic Mn- Co-doped...