The decription of MCM-48

Mesoporous molecular sieves MCM-48 type were prepared by hydrothermal synthesis and novel at room temperature. Scanning electron microscope (SEM) studies have shown that nonagglomerated uniform spheres of size ca. 0.5 microns were obtained by the process room temperature. Internal pore structure was studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution adsorption of nitrogen and argon. Pore ​​size distributions were calculated from low temperature nitrogen and argon adsorption isotherms by density functional theory nonlocal (NLDFT) method. A new approach to calculating the wall thickness of the pores of MCM-48 of the diffraction and gas adsorption isotherms has been used. The approach uses the intrinsic symmetry of the structure of MCM-48 pores, cubic, space group Ia3d, revealed by XRD and combines the results of the analysis of the distribution with the pore size of the overall relationship between the structural parameters of the geometric Gyroid minimal surface area. The wall thickness of the pores of MCM-48 calculated from the nitrogen and argon adsorption data was found to be ca. 8-10 A, in good agreement with estimates obtained from TEM.
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