Preparation of SiO_2 ordered macroporous materials with high filling ratio

The effects of some factors such as filling methods, filling time and filling times on the filling of precursor in a colloidal crystal template method were systemically investigated for preparing SiO₂ ordered macroporous materials. The results show that a direct dipping method usually brings shrink, desquamation and surface overlay. A new filling method was presented, which is dipping the template after covering glass on it, and the method can effectively solve the above problem. Experimental data reveal that when the filling time is 5 rain and the prepared macroporous materials are filled two times, the filling ratio is higher. Scanning electron microscopy (SEM) images and spectrophotometer results indicated that SiO₂ ordered macroporous materials with large area were successfully prepared and the filling ratio reached 22.53%.