Pore Material (Molecular Sieve, MOF Material)
According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), mesoporous materials are porous materials with pore diameters in the range of 2–50 nm. According to the Bragg equation dhkl = λ/(2sinθhkl), the corresponding 2θ = 0°–4°, which is exactly within the small-angle diffraction range. Using small-angle X-ray diffraction (XRD) testing, the mesoscopic structure, space group relationships, and degree of order of mesoporous materials can be determined. This is the most important and fundamental characterization method for mesoporous materials. Small-angle X-ray diffraction is the most important characterization method for mesoporous materials. The small-angle X-ray diffraction pattern of mesoporous materials mainly presents diffraction peaks between 1° and 2°.
