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Preparation of colloidal crystal template for inverse opal hydrogels

Abstract Colloidal crystal template for inverse opal hydrogel is constructed by vertical deposition method using monodispersed silica nanospheres. By adjusting the concentration of monodispersed silica nanospheres, it is found that well-structured silica template with more than 20 layers is formed when the concentration of the silica is 3.5 wt%. To enhance its strength, the prepared template is put in an oven at 500 °C for 2 h. The surface of the template is divided into many blocks by cracks formed in the process of heat treatment. The number of blocks varies with the rising time of the temperature from 25 to 500 °C. Under the same magnification, blocks formed with the rising time of 150 min can be nearly 4 times more than the blocks with a rising time of 300 min or 500 min, which means the slow rising velocity of the temperature can lead to a better colloidal crystal template with fewer blocks.