Preparation of resorcinol-formaldehyde aerogel hollow microspheres

Based on the technique of micro fluid injection molding, RF hollow microspheres were synthesized by using dibutyl phthalate as oil phase, RF solution as water phase, and by sol-gel, solvent exchanging and supercritical drying. The components, morphology, aperture, and diameter distribution of RF hollow microspheres were characterized by infrared spectrum, X-ray micro analysis, TEM, and nitrogen adsorption-desorption respectively.The results show that RF hollow microsphere is monolayered and has a typical structure of the porous aerogel. The pores are consisting of nearly uniform nano-particles about 10 nm in diameter, and their average aperture is about 20 nm. The sphericity and concentricity of the monolayer hollow microsphere is higher than 95%, the diameter distribution of RF hollow mic