Topic
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 article, a stable mesoporous aluminosilicate with hexagonal symmetry (MAS-5) has been synthesized by the co-templates of tetraethylammonium hydroxide (TEAOH) and cetyltrimethylammmonium bromide (CTAB) cationic surfactant.
38 citations
TL;DR: In this paper, ordered hexagonal mesoporous silica material (JLU-30) has been successfully synthesized in alkaline media at high temperature (>160 °C), using cationic (1,3-dimethyl-2-imidazolidin-2ylidene)hexadecylmethylammonium bromide (DIHAB) as a template, and characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption−desorption isotherms, differential thermal analysis (
Abstract: Ordered hexagonal mesoporous silica material (JLU-30) has been successfully synthesized in alkaline media at high temperature (>160 °C), using cationic (1,3-dimethyl-2-imidazolidin-2-ylidene)hexadecylmethylammonium bromide (DIHAB) as a template, and characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption−desorption isotherms, differential thermal analysis (DTA), and thermogravimetric analysis (TG), as well as 27Al and 29Si nuclear magnetic resonance (NMR) spectroscopy. Mesoporous JLU-30 shows much higher hydrothermal stability than MCM-41. 29Si NMR spectra indicate that the pore walls of JLU-30 samples synthesized at high temperature (160 °C) are fully condensed, giving a Q4/Q3 ratio as high as 6.2. In contrast, MCM-41 synthesized at relatively low temperature (100 °C) shows the Q4/Q3 + Q2 ratio at 1.1. Such unique structural feature might be responsible for the observed highly hydrothermal stability of the mesoporous silica materials (JLU-30). Furthermore, ...
37 citations
TL;DR: In this article, a mesoporous MCM-41 was synthesized using a hydrothermal method with the extracted Na 2 SiO 3 and Fe 2 O 3 using a small angle XRD, N 2 adsorption-desorption and HRTEM.
37 citations
TL;DR: Magnetite nanoparticles were used as a core for a mesoporous MCM-41 shell to provide a core-shell solid acid catalyst (Fe3O4@MCM41-OSO3H) as discussed by the authors.
Abstract: Magnetite nanoparticles were used as a core for –OSO3H functionalized mesoporous MCM-41 shell to provide a core–shell solid acid catalyst (Fe3O4@MCM-41-OSO3H). The catalyst was characterized by transmission electron microscopy (TEM), infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and a vibrating sample magnetometer (VSM). The obtained nano-magnetic catalyst was used in the three-component reaction of indoles, aldehydes and thiols to furnish the desired 3-[(aryl)(arylthio)methyl]-1H-indoles in good yields under very mild reaction conditions. The unique feature of the reaction was the ease of work-up and catalyst recovery. The recovered catalyst maintained catalytic activity for five successive runs.
37 citations
TL;DR: In this paper, a general synthetic route for the fabrication of carbon-silica composites with a carbon layer coating the mesopores of the mesostructured silica is presented.
37 citations