Preparation Of Size-controlled And Monodisperse Ceramic Microspheres By Microfluidic

Ceramic material plays an important role in the development of human society.Monodisperse ceramic microspheres,which are widely used and valued in the nuclear industry,medicine,catalysis,environmental protection,extraction and other fields are superior to other materials so that the preparation methods of ceramic microspheres are greatly increased.However,these methods are deficient in the size uniformity of ceramic microspheres,controlling the particle size,the high sphericity and so on.In this article,the microfluidics and gel-casting technique are combined together to prepare ceramic microspheres.The alumina slurry is firstly prepared by gel-casting method,then the ceramic microspheres with uniform particle size and high sphericity are synthesized through microfluidics method,the alumina slurry and the dimethyl silicone oil is used as the disperse phase and continue phase separately.The effects of flow rate of continuous and dispersed phase on the size and size distribution of ceramic microspheres are discussed,and the shapes and properties of microspheres is characterized by optical microscopy,scanning electron microscopy(SEM),differential thermal scanning.Eventually,the technology combination of microfluidics and gel-casting method is concluded and used to prepare ceramic microspheres,the ceramic microspheres have been achieved a controlled preparation by optimizing the flow rate of continuous and disperse phase.Furthermore,the surface exfoliation mechanism of ceramic microspheres is researched and the exfoliation phenomenon is solved eventually.The shell exfoliated from ceramic microspheres and the core of ceramic microspheres are analyzed by infrared spectroscopy.The acryl amide monomer on the surface of ceramic microspheres does not polymerize,which directly contacts with the dimethyl silicone oil.If some span80 is added into the collection device containing the dimethyl silicone oil,which could form a protective film on the surface of ceramic microspheres to prevent the microspheres contacting with the dimethyl silicone oil.