Method for measuring pore volume and pore diameter of mesoporous material on the basis of liquid photonic crystal

• Main Authors: GE JIANPING, ZHU BITING
• Format: Patent
• Language: Chinese; English
• Published: 29.12.2017
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for determining the pore volume and the pore diameter of a mesoporous material by utilizing the change of reflection spectrums of liquid photonic crystal. After standing, high-concentration SiO2 colloidal-particle ethylene glycol solution can precipitate out the liquid photonic crystal. When the liquid photonic crystal is mixed with the mesoporous material, ethylene glycol is absorbed into mesoporous channels to cause shrinkage of crystal lattices of the precipitated-out photonic crystal and blue shift of reflection peaks. Shown respectively by variable-mass and variable-temperature absorption experiments, the reflection wavelength variation (delta lambda/m) caused by the mesoporous material in unit mass is in positive correlation to the pore volume (V) of the material, and the lowest temperature (T) achieving saturated absorption is in negative correlation to the pore diameter (D) of the material. On the basis of the pore structure and spectrum data of a standard mesoporous s